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Most of the code is this directory was written by several people for
the Nix project (http://nixos.org/nix). Thanks!

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GNU LESSER GENERAL PUBLIC LICENSE
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//
// boost/assert.hpp - BOOST_ASSERT(expr)
//
// Copyright (c) 2001, 2002 Peter Dimov and Multi Media Ltd.
//
// Permission to copy, use, modify, sell and distribute this software
// is granted provided this copyright notice appears in all copies.
// This software is provided "as is" without express or implied
// warranty, and with no claim as to its suitability for any purpose.
//
// Note: There are no include guards. This is intentional.
//
// See http://www.boost.org/libs/utility/assert.html for documentation.
//
#undef BOOST_ASSERT
#if defined(BOOST_DISABLE_ASSERTS)
# define BOOST_ASSERT(expr) ((void)0)
#elif defined(BOOST_ENABLE_ASSERT_HANDLER)
#include <boost/current_function.hpp>
namespace boost
{
void assertion_failed(char const * expr, char const * function, char const * file, long line); // user defined
} // namespace boost
#define BOOST_ASSERT(expr) ((expr)? ((void)0): ::boost::assertion_failed(#expr, BOOST_CURRENT_FUNCTION, __FILE__, __LINE__))
#else
# include <assert.h>
# define BOOST_ASSERT(expr) assert(expr)
#endif

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// -*- C++ -*-
// Boost general library 'format' ---------------------------
// See http://www.boost.org for updates, documentation, and revision history.
// (C) Samuel Krempp 2001
// krempp@crans.ens-cachan.fr
// Permission to copy, use, modify, sell and
// distribute this software is granted provided this copyright notice appears
// in all copies. This software is provided "as is" without express or implied
// warranty, and with no claim as to its suitability for any purpose.
// ideas taken from Rüdiger Loos's format class
// and Karl Nelson's ofstream
// ----------------------------------------------------------------------------
// format.hpp : primary header
// ----------------------------------------------------------------------------
#ifndef BOOST_FORMAT_HPP
#define BOOST_FORMAT_HPP
#include <vector>
#include <string>
#include <sstream>
#include <cassert>
#if HAVE_LOCALE
#include <locale>
#else
#define BOOST_NO_STD_LOCALE
#define BOOST_NO_LOCALE_ISIDIGIT
#include <cctype>
#endif
#include <boost/format/macros_default.hpp>
// **** Forward declarations ----------------------------------
#include <boost/format/format_fwd.hpp> // basic_format<Ch,Tr>, and other frontends
#include <boost/format/internals_fwd.hpp> // misc forward declarations for internal use
// **** Auxiliary structs (stream_format_state<Ch,Tr> , and format_item<Ch,Tr> )
#include <boost/format/internals.hpp>
// **** Format class interface --------------------------------
#include <boost/format/format_class.hpp>
// **** Exceptions -----------------------------------------------
#include <boost/format/exceptions.hpp>
// **** Implementation -------------------------------------------
//#include <boost/format/format_implementation.hpp> // member functions
#include <boost/format/group.hpp> // class for grouping arguments
#include <boost/format/feed_args.hpp> // argument-feeding functions
//#include <boost/format/parsing.hpp> // format-string parsing (member-)functions
// **** Implementation of the free functions ----------------------
//#include <boost/format/free_funcs.hpp>
#endif // BOOST_FORMAT_HPP

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// -*- C++ -*-
// Boost general library 'format' ---------------------------
// See http://www.boost.org for updates, documentation, and revision history.
// (C) Samuel Krempp 2001
// krempp@crans.ens-cachan.fr
// Permission to copy, use, modify, sell and
// distribute this software is granted provided this copyright notice appears
// in all copies. This software is provided "as is" without express or implied
// warranty, and with no claim as to its suitability for any purpose.
// ideas taken from Rüdiger Loos's format class
// and Karl Nelson's ofstream (also took its parsing code as basis for printf parsing)
// ------------------------------------------------------------------------------
// exceptions.hpp
// ------------------------------------------------------------------------------
#ifndef BOOST_FORMAT_EXCEPTIONS_HPP
#define BOOST_FORMAT_EXCEPTIONS_HPP
#include <stdexcept>
namespace boost {
namespace io {
// **** exceptions -----------------------------------------------
class format_error : public std::exception
{
public:
format_error() {}
virtual const char *what() const throw()
{
return "boost::format_error: "
"format generic failure";
}
};
class bad_format_string : public format_error
{
public:
bad_format_string() {}
virtual const char *what() const throw()
{
return "boost::bad_format_string: "
"format-string is ill-formed";
}
};
class too_few_args : public format_error
{
public:
too_few_args() {}
virtual const char *what() const throw()
{
return "boost::too_few_args: "
"format-string refered to more arguments than were passed";
}
};
class too_many_args : public format_error
{
public:
too_many_args() {}
virtual const char *what() const throw()
{
return "boost::too_many_args: "
"format-string refered to less arguments than were passed";
}
};
class out_of_range : public format_error
{
public:
out_of_range() {}
virtual const char *what() const throw()
{
return "boost::out_of_range: "
"tried to refer to an argument (or item) number which is out of range, "
"according to the format string.";
}
};
} // namespace io
} // namespace boost
#endif // BOOST_FORMAT_EXCEPTIONS_HPP

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// -*- C++ -*-
// Boost general library 'format' ---------------------------
// See http://www.boost.org for updates, documentation, and revision history.
// (C) Samuel Krempp 2001
// krempp@crans.ens-cachan.fr
// Permission to copy, use, modify, sell and
// distribute this software is granted provided this copyright notice appears
// in all copies. This software is provided "as is" without express or implied
// warranty, and with no claim as to its suitability for any purpose.
// ideas taken from Rüdiger Loos's format class
// and Karl Nelson's ofstream
// ----------------------------------------------------------------------------
// feed_args.hpp : functions for processing each argument
// (feed, feed_manip, and distribute)
// ----------------------------------------------------------------------------
#ifndef BOOST_FORMAT_FEED_ARGS_HPP
#define BOOST_FORMAT_FEED_ARGS_HPP
#include "boost/format/format_class.hpp"
#include "boost/format/group.hpp"
#include "boost/throw_exception.hpp"
namespace boost {
namespace io {
namespace detail {
namespace {
inline
void empty_buf(BOOST_IO_STD ostringstream & os) {
static const std::string emptyStr;
os.str(emptyStr);
}
void do_pad( std::string & s,
std::streamsize w,
const char c,
std::ios::fmtflags f,
bool center)
// applies centered / left / right padding to the string s.
// Effects : string s is padded.
{
std::streamsize n=w-s.size();
if(n<=0) {
return;
}
if(center)
{
s.reserve(w); // allocate once for the 2 inserts
const std::streamsize n1 = n /2, n0 = n - n1;
s.insert(s.begin(), n0, c);
s.append(n1, c);
}
else
{
if(f & std::ios::left) {
s.append(n, c);
}
else {
s.insert(s.begin(), n, c);
}
}
} // -do_pad(..)
template<class T> inline
void put_head(BOOST_IO_STD ostream& , const T& ) {
}
template<class T> inline
void put_head( BOOST_IO_STD ostream& os, const group1<T>& x ) {
os << group_head(x.a1_); // send the first N-1 items, not the last
}
template<class T> inline
void put_last( BOOST_IO_STD ostream& os, const T& x ) {
os << x ;
}
template<class T> inline
void put_last( BOOST_IO_STD ostream& os, const group1<T>& x ) {
os << group_last(x.a1_); // this selects the last element
}
#ifndef BOOST_NO_OVERLOAD_FOR_NON_CONST
template<class T> inline
void put_head( BOOST_IO_STD ostream& , T& ) {
}
template<class T> inline
void put_last( BOOST_IO_STD ostream& os, T& x ) {
os << x ;
}
#endif
template<class T>
void put( T x,
const format_item& specs,
std::string & res,
BOOST_IO_STD ostringstream& oss_ )
{
// does the actual conversion of x, with given params, into a string
// using the *supplied* strinstream. (the stream state is important)
typedef std::string string_t;
typedef format_item format_item_t;
stream_format_state prev_state(oss_);
specs.state_.apply_on(oss_);
// in case x is a group, apply the manip part of it,
// in order to find width
put_head( oss_, x );
empty_buf( oss_);
const std::streamsize w=oss_.width();
const std::ios::fmtflags fl=oss_.flags();
const bool internal = (fl & std::ios::internal) != 0;
const bool two_stepped_padding = internal
&& ! ( specs.pad_scheme_ & format_item_t::spacepad )
&& specs.truncate_ < 0 ;
if(! two_stepped_padding)
{
if(w>0) // handle simple padding via do_pad, not natively in stream
oss_.width(0);
put_last( oss_, x);
res = oss_.str();
if (specs.truncate_ >= 0)
res.erase(specs.truncate_);
// complex pads :
if(specs.pad_scheme_ & format_item_t::spacepad)
{
if( res.size()==0 || ( res[0]!='+' && res[0]!='-' ))
{
res.insert(res.begin(), 1, ' '); // insert 1 space at pos 0
}
}
if(w > 0) // need do_pad
{
do_pad(res,w,oss_.fill(), fl, (specs.pad_scheme_ & format_item_t::centered) !=0 );
}
}
else // 2-stepped padding
{
put_last( oss_, x); // oss_.width() may result in padding.
res = oss_.str();
if (specs.truncate_ >= 0)
res.erase(specs.truncate_);
if( res.size() - w > 0)
{ // length w exceeded
// either it was multi-output with first output padding up all width..
// either it was one big arg and we are fine.
empty_buf( oss_);
oss_.width(0);
put_last(oss_, x );
string_t tmp = oss_.str(); // minimal-length output
std::streamsize d;
if( (d=w - tmp.size()) <=0 )
{
// minimal length is already >= w, so no padding (cool!)
res.swap(tmp);
}
else
{ // hum.. we need to pad (it was necessarily multi-output)
typedef typename string_t::size_type size_type;
size_type i = 0;
while( i<tmp.size() && tmp[i] == res[i] ) // find where we should pad.
++i;
tmp.insert(i, static_cast<size_type>( d ), oss_.fill());
res.swap( tmp );
}
}
else
{ // okay, only one thing was printed and padded, so res is fine.
}
}
prev_state.apply_on(oss_);
empty_buf( oss_);
oss_.clear();
} // end- put(..)
} // local namespace
template<class T>
void distribute(basic_format& self, T x)
// call put(x, ..) on every occurence of the current argument :
{
if(self.cur_arg_ >= self.num_args_)
{
if( self.exceptions() & too_many_args_bit )
boost::throw_exception(too_many_args()); // too many variables have been supplied !
else return;
}
for(unsigned long i=0; i < self.items_.size(); ++i)
{
if(self.items_[i].argN_ == self.cur_arg_)
{
put<T> (x, self.items_[i], self.items_[i].res_, self.oss_ );
}
}
}
template<class T>
basic_format& feed(basic_format& self, T x)
{
if(self.dumped_) self.clear();
distribute<T> (self, x);
++self.cur_arg_;
if(self.bound_.size() != 0)
{
while( self.cur_arg_ < self.num_args_ && self.bound_[self.cur_arg_] )
++self.cur_arg_;
}
// this arg is finished, reset the stream's format state
self.state0_.apply_on(self.oss_);
return self;
}
} // namespace detail
} // namespace io
} // namespace boost
#endif // BOOST_FORMAT_FEED_ARGS_HPP

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// -*- C++ -*-
// Boost general library 'format' ---------------------------
// See http://www.boost.org for updates, documentation, and revision history.
// (C) Samuel Krempp 2001
// krempp@crans.ens-cachan.fr
// Permission to copy, use, modify, sell and
// distribute this software is granted provided this copyright notice appears
// in all copies. This software is provided "as is" without express or implied
// warranty, and with no claim as to its suitability for any purpose.
// ideas taken from Rüdiger Loos's format class
// and Karl Nelson's ofstream (also took its parsing code as basis for printf parsing)
// ------------------------------------------------------------------------------
// format_class.hpp : class interface
// ------------------------------------------------------------------------------
#ifndef BOOST_FORMAT_CLASS_HPP
#define BOOST_FORMAT_CLASS_HPP
#include <vector>
#include <string>
#include <boost/format/format_fwd.hpp>
#include <boost/format/internals_fwd.hpp>
#include <boost/format/internals.hpp>
namespace boost {
class basic_format
{
public:
typedef std::string string_t;
typedef BOOST_IO_STD ostringstream internal_stream_t;
private:
typedef BOOST_IO_STD ostream stream_t;
typedef io::detail::stream_format_state stream_format_state;
typedef io::detail::format_item format_item_t;
public:
basic_format(const char* str);
basic_format(const string_t& s);
#ifndef BOOST_NO_STD_LOCALE
basic_format(const char* str, const std::locale & loc);
basic_format(const string_t& s, const std::locale & loc);
#endif // no locale
basic_format(const basic_format& x);
basic_format& operator= (const basic_format& x);
basic_format& clear(); // empty the string buffers (except bound arguments, see clear_binds() )
// pass arguments through those operators :
template<class T> basic_format& operator%(const T& x)
{
return io::detail::feed<const T&>(*this,x);
}
#ifndef BOOST_NO_OVERLOAD_FOR_NON_CONST
template<class T> basic_format& operator%(T& x)
{
return io::detail::feed<T&>(*this,x);
}
#endif
// system for binding arguments :
template<class T>
basic_format& bind_arg(int argN, const T& val)
{
return io::detail::bind_arg_body(*this, argN, val);
}
basic_format& clear_bind(int argN);
basic_format& clear_binds();
// modify the params of a directive, by applying a manipulator :
template<class T>
basic_format& modify_item(int itemN, const T& manipulator)
{
return io::detail::modify_item_body(*this, itemN, manipulator) ;
}
// Choosing which errors will throw exceptions :
unsigned char exceptions() const;
unsigned char exceptions(unsigned char newexcept);
// final output
string_t str() const;
friend BOOST_IO_STD ostream&
operator<< ( BOOST_IO_STD ostream& , const basic_format& );
template<class T> friend basic_format&
io::detail::feed(basic_format&, T);
template<class T> friend
void io::detail::distribute(basic_format&, T);
template<class T> friend
basic_format& io::detail::modify_item_body(basic_format&, int, const T&);
template<class T> friend
basic_format& io::detail::bind_arg_body(basic_format&, int, const T&);
// make the members private only if the friend templates are supported
private:
// flag bits, used for style_
enum style_values { ordered = 1, // set only if all directives are positional directives
special_needs = 4 };
// parse the format string :
void parse(const string_t&);
int style_; // style of format-string : positional or not, etc
int cur_arg_; // keep track of wich argument will come
int num_args_; // number of expected arguments
mutable bool dumped_; // true only after call to str() or <<
std::vector<format_item_t> items_; // vector of directives (aka items)
string_t prefix_; // piece of string to insert before first item
std::vector<bool> bound_; // stores which arguments were bound
// size = num_args OR zero
internal_stream_t oss_; // the internal stream.
stream_format_state state0_; // reference state for oss_
unsigned char exceptions_;
}; // class basic_format
} // namespace boost
#endif // BOOST_FORMAT_CLASS_HPP

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// -*- C++ -*-
// Boost general library 'format' ---------------------------
// See http://www.boost.org for updates, documentation, and revision history.
// (C) Samuel Krempp 2001
// krempp@crans.ens-cachan.fr
// Permission to copy, use, modify, sell and
// distribute this software is granted provided this copyright notice appears
// in all copies. This software is provided "as is" without express or implied
// warranty, and with no claim as to its suitability for any purpose.
// ideas taken from Rüdiger Loos's format class
// and Karl Nelson's ofstream (also took its parsing code as basis for printf parsing)
// ------------------------------------------------------------------------------
// format_fwd.hpp : forward declarations, for primary header format.hpp
// ------------------------------------------------------------------------------
#ifndef BOOST_FORMAT_FWD_HPP
#define BOOST_FORMAT_FWD_HPP
#include <string>
#include <iosfwd>
namespace boost {
class basic_format;
typedef basic_format format;
namespace io {
enum format_error_bits { bad_format_string_bit = 1,
too_few_args_bit = 2, too_many_args_bit = 4,
out_of_range_bit = 8,
all_error_bits = 255, no_error_bits=0 };
// Convertion: format to string
std::string str(const basic_format& ) ;
} // namespace io
BOOST_IO_STD ostream&
operator<<( BOOST_IO_STD ostream&, const basic_format&);
} // namespace boost
#endif // BOOST_FORMAT_FWD_HPP

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// -*- C++ -*-
// Boost general library format ---------------------------
// See http://www.boost.org for updates, documentation, and revision history.
// (C) Samuel Krempp 2001
// krempp@crans.ens-cachan.fr
// Permission to copy, use, modify, sell and
// distribute this software is granted provided this copyright notice appears
// in all copies. This software is provided "as is" without express or implied
// warranty, and with no claim as to its suitability for any purpose.
// ideas taken from Rüdiger Loos's format class
// and Karl Nelson's ofstream
// ----------------------------------------------------------------------------
// format_implementation.hpp Implementation of the basic_format class
// ----------------------------------------------------------------------------
#ifndef BOOST_FORMAT_IMPLEMENTATION_HPP
#define BOOST_FORMAT_IMPLEMENTATION_HPP
#include <boost/throw_exception.hpp>
#include <boost/assert.hpp>
#include <boost/format.hpp>
namespace boost {
// -------- format:: -------------------------------------------
basic_format::basic_format(const char* str)
: style_(0), cur_arg_(0), num_args_(0), dumped_(false),
items_(), oss_(), exceptions_(io::all_error_bits)
{
state0_.set_by_stream(oss_);
string_t emptyStr;
if( !str) str = emptyStr.c_str();
parse( str );
}
#ifndef BOOST_NO_STD_LOCALE
basic_format::basic_format(const char* str, const std::locale & loc)
: style_(0), cur_arg_(0), num_args_(0), dumped_(false),
items_(), oss_(), exceptions_(io::all_error_bits)
{
oss_.imbue( loc );
state0_.set_by_stream(oss_);
string_t emptyStr;
if( !str) str = emptyStr.c_str();
parse( str );
}
basic_format::basic_format(const string_t& s, const std::locale & loc)
: style_(0), cur_arg_(0), num_args_(0), dumped_(false),
items_(), oss_(), exceptions_(io::all_error_bits)
{
oss_.imbue( loc );
state0_.set_by_stream(oss_);
parse(s);
}
#endif //BOOST_NO_STD_LOCALE
basic_format::basic_format(const string_t& s)
: style_(0), cur_arg_(0), num_args_(0), dumped_(false),
items_(), oss_(), exceptions_(io::all_error_bits)
{
state0_.set_by_stream(oss_);
parse(s);
}
basic_format:: basic_format(const basic_format& x)
: style_(x.style_), cur_arg_(x.cur_arg_), num_args_(x.num_args_), dumped_(false),
items_(x.items_), prefix_(x.prefix_), bound_(x.bound_),
oss_(), // <- we obviously can't copy x.oss_
state0_(x.state0_), exceptions_(x.exceptions_)
{
state0_.apply_on(oss_);
}
basic_format& basic_format::operator= (const basic_format& x)
{
if(this == &x)
return *this;
state0_ = x.state0_;
state0_.apply_on(oss_);
// plus all the other (trivial) assignments :
exceptions_ = x.exceptions_;
items_ = x.items_;
prefix_ = x.prefix_;
bound_=x.bound_;
style_=x.style_;
cur_arg_=x.cur_arg_;
num_args_=x.num_args_;
dumped_=x.dumped_;
return *this;
}
unsigned char basic_format::exceptions() const
{
return exceptions_;
}
unsigned char basic_format::exceptions(unsigned char newexcept)
{
unsigned char swp = exceptions_;
exceptions_ = newexcept;
return swp;
}
basic_format& basic_format ::clear()
// empty the string buffers (except bound arguments, see clear_binds() )
// and make the format object ready for formatting a new set of arguments
{
BOOST_ASSERT( bound_.size()==0 || num_args_ == static_cast<int>(bound_.size()) );
for(unsigned long i=0; i<items_.size(); ++i){
items_[i].state_ = items_[i].ref_state_;
// clear converted strings only if the corresponding argument is not bound :
if( bound_.size()==0 || !bound_[ items_[i].argN_ ] ) items_[i].res_.resize(0);
}
cur_arg_=0; dumped_=false;
// maybe first arg is bound:
if(bound_.size() != 0)
{
while(cur_arg_ < num_args_ && bound_[cur_arg_] ) ++cur_arg_;
}
return *this;
}
basic_format& basic_format ::clear_binds()
// cancel all bindings, and clear()
{
bound_.resize(0);
clear();
return *this;
}
basic_format& basic_format::clear_bind(int argN)
// cancel the binding of ONE argument, and clear()
{
if(argN<1 || argN > num_args_ || bound_.size()==0 || !bound_[argN-1] )
{
if( exceptions() & io::out_of_range_bit )
boost::throw_exception(io::out_of_range()); // arg not in range.
else return *this;
}
bound_[argN-1]=false;
clear();
return *this;
}
std::string basic_format::str() const
{
dumped_=true;
if(items_.size()==0)
return prefix_;
if( cur_arg_ < num_args_)
if( exceptions() & io::too_few_args_bit )
boost::throw_exception(io::too_few_args()); // not enough variables have been supplied !
unsigned long sz = prefix_.size();
unsigned long i;
for(i=0; i < items_.size(); ++i)
sz += items_[i].res_.size() + items_[i].appendix_.size();
string_t res;
res.reserve(sz);
res += prefix_;
for(i=0; i < items_.size(); ++i)
{
const format_item_t& item = items_[i];
res += item.res_;
if( item.argN_ == format_item_t::argN_tabulation)
{
BOOST_ASSERT( item.pad_scheme_ & format_item_t::tabulation);
std::streamsize n = item.state_.width_ - res.size();
if( n > 0 )
res.append( n, item.state_.fill_ );
}
res += item.appendix_;
}
return res;
}
namespace io {
namespace detail {
template<class T>
basic_format& bind_arg_body( basic_format& self,
int argN,
const T& val)
// bind one argument to a fixed value
// this is persistent over clear() calls, thus also over str() and <<
{
if(self.dumped_) self.clear(); // needed, because we will modify cur_arg_..
if(argN<1 || argN > self.num_args_)
{
if( self.exceptions() & io::out_of_range_bit )
boost::throw_exception(io::out_of_range()); // arg not in range.
else return self;
}
if(self.bound_.size()==0)
self.bound_.assign(self.num_args_,false);
else
BOOST_ASSERT( self.num_args_ == static_cast<signed int>(self.bound_.size()) );
int o_cur_arg = self.cur_arg_;
self.cur_arg_ = argN-1; // arrays begin at 0
self.bound_[self.cur_arg_]=false; // if already set, we unset and re-sets..
self.operator%(val); // put val at the right place, because cur_arg is set
// Now re-position cur_arg before leaving :
self.cur_arg_ = o_cur_arg;
self.bound_[argN-1]=true;
if(self.cur_arg_ == argN-1 )
// hum, now this arg is bound, so move to next free arg
{
while(self.cur_arg_ < self.num_args_ && self.bound_[self.cur_arg_]) ++self.cur_arg_;
}
// In any case, we either have all args, or are on a non-binded arg :
BOOST_ASSERT( self.cur_arg_ >= self.num_args_ || ! self.bound_[self.cur_arg_]);
return self;
}
template<class T>
basic_format& modify_item_body( basic_format& self,
int itemN,
const T& manipulator)
// applies a manipulator to the format_item describing a given directive.
// this is a permanent change, clear or clear_binds won't cancel that.
{
if(itemN<1 || itemN >= static_cast<signed int>(self.items_.size() ))
{
if( self.exceptions() & io::out_of_range_bit )
boost::throw_exception(io::out_of_range()); // item not in range.
else return self;
}
self.items_[itemN-1].ref_state_.apply_manip( manipulator );
self.items_[itemN-1].state_ = self.items_[itemN-1].ref_state_;
return self;
}
} // namespace detail
} // namespace io
} // namespace boost
#endif // BOOST_FORMAT_IMPLEMENTATION_HPP

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// -*- C++ -*-
// Boost general library 'format' ---------------------------
// See http://www.boost.org for updates, documentation, and revision history.
// (C) Samuel Krempp 2001
// krempp@crans.ens-cachan.fr
// Permission to copy, use, modify, sell and
// distribute this software is granted provided this copyright notice appears
// in all copies. This software is provided "as is" without express or implied
// warranty, and with no claim as to its suitability for any purpose.
// ideas taken from Rüdiger Loos's format class
// and Karl Nelson's ofstream (also took its parsing code as basis for printf parsing)
// ------------------------------------------------------------------------------
// free_funcs.hpp : implementation of the free functions declared in namespace format
// ------------------------------------------------------------------------------
#ifndef BOOST_FORMAT_FUNCS_HPP
#define BOOST_FORMAT_FUNCS_HPP
#include "boost/format.hpp"
#include "boost/throw_exception.hpp"
namespace boost {
namespace io {
inline
std::string str(const basic_format& f)
// adds up all pieces of strings and converted items, and return the formatted string
{
return f.str();
}
} // - namespace io
BOOST_IO_STD ostream&
operator<<( BOOST_IO_STD ostream& os,
const boost::basic_format& f)
// effect: "return os << str(f);" but we can try to do it faster
{
typedef boost::basic_format format_t;
if(f.items_.size()==0)
os << f.prefix_;
else {
if(f.cur_arg_ < f.num_args_)
if( f.exceptions() & io::too_few_args_bit )
boost::throw_exception(io::too_few_args()); // not enough variables have been supplied !
if(f.style_ & format_t::special_needs)
os << f.str();
else {
// else we dont have to count chars output, so we dump directly to os :
os << f.prefix_;
for(unsigned long i=0; i<f.items_.size(); ++i)
{
const format_t::format_item_t& item = f.items_[i];
os << item.res_;
os << item.appendix_;
}
}
}
f.dumped_=true;
return os;
}
} // namespace boost
#endif // BOOST_FORMAT_FUNCS_HPP

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// -*- C++ -*-
// Boost general library 'format' ---------------------------
// See http://www.boost.org for updates, documentation, and revision history.
// (C) Samuel Krempp 2001
// krempp@crans.ens-cachan.fr
// Permission to copy, use, modify, sell and
// distribute this software is granted provided this copyright notice appears
// in all copies. This software is provided "as is" without express or implied
// warranty, and with no claim as to its suitability for any purpose.
// ideas taken from Rüdiger Loos's format class
// and Karl Nelson's ofstream
// ----------------------------------------------------------------------------
// group.hpp : encapsulates a group of manipulators along with an argument
//
// group_head : cut the last element of a group out.
// (is overloaded below on each type of group)
// group_last : returns the last element of a group
// (is overloaded below on each type of group)
// ----------------------------------------------------------------------------
#ifndef BOOST_FORMAT_GROUP_HPP
#define BOOST_FORMAT_GROUP_HPP
namespace boost {
namespace io {
namespace detail {
// empty group, but useful even though.
struct group0
{
group0() {}
};
template <class Ch, class Tr>
inline
BOOST_IO_STD ostream&
operator << ( BOOST_IO_STD ostream& os,
const group0& )
{
return os;
}
template <class T1>
struct group1
{
T1 a1_;
group1(T1 a1)
: a1_(a1)
{}
};
template <class Ch, class Tr, class T1>
inline
BOOST_IO_STD ostream&
operator << (BOOST_IO_STD ostream& os,
const group1<T1>& x)
{
os << x.a1_;
return os;
}
template <class T1,class T2>
struct group2
{
T1 a1_;
T2 a2_;
group2(T1 a1,T2 a2)
: a1_(a1),a2_(a2)
{}
};
template <class Ch, class Tr, class T1,class T2>
inline
BOOST_IO_STD ostream&
operator << (BOOST_IO_STD ostream& os,
const group2<T1,T2>& x)
{
os << x.a1_<< x.a2_;
return os;
}
template <class T1,class T2,class T3>
struct group3
{
T1 a1_;
T2 a2_;
T3 a3_;
group3(T1 a1,T2 a2,T3 a3)
: a1_(a1),a2_(a2),a3_(a3)
{}
};
template <class Ch, class Tr, class T1,class T2,class T3>
inline
BOOST_IO_STD ostream&
operator << (BOOST_IO_STD ostream& os,
const group3<T1,T2,T3>& x)
{
os << x.a1_<< x.a2_<< x.a3_;
return os;
}
template <class T1,class T2,class T3,class T4>
struct group4
{
T1 a1_;
T2 a2_;
T3 a3_;
T4 a4_;
group4(T1 a1,T2 a2,T3 a3,T4 a4)
: a1_(a1),a2_(a2),a3_(a3),a4_(a4)
{}
};
template <class Ch, class Tr, class T1,class T2,class T3,class T4>
inline
BOOST_IO_STD ostream&
operator << (BOOST_IO_STD ostream& os,
const group4<T1,T2,T3,T4>& x)
{
os << x.a1_<< x.a2_<< x.a3_<< x.a4_;
return os;
}
template <class T1,class T2,class T3,class T4,class T5>
struct group5
{
T1 a1_;
T2 a2_;
T3 a3_;
T4 a4_;
T5 a5_;
group5(T1 a1,T2 a2,T3 a3,T4 a4,T5 a5)
: a1_(a1),a2_(a2),a3_(a3),a4_(a4),a5_(a5)
{}
};
template <class Ch, class Tr, class T1,class T2,class T3,class T4,class T5>
inline
BOOST_IO_STD ostream&
operator << (BOOST_IO_STD ostream& os,
const group5<T1,T2,T3,T4,T5>& x)
{
os << x.a1_<< x.a2_<< x.a3_<< x.a4_<< x.a5_;
return os;
}
template <class T1,class T2,class T3,class T4,class T5,class T6>
struct group6
{
T1 a1_;
T2 a2_;
T3 a3_;
T4 a4_;
T5 a5_;
T6 a6_;
group6(T1 a1,T2 a2,T3 a3,T4 a4,T5 a5,T6 a6)
: a1_(a1),a2_(a2),a3_(a3),a4_(a4),a5_(a5),a6_(a6)
{}
};
template <class Ch, class Tr, class T1,class T2,class T3,class T4,class T5,class T6>
inline
BOOST_IO_STD ostream&
operator << (BOOST_IO_STD ostream& os,
const group6<T1,T2,T3,T4,T5,T6>& x)
{
os << x.a1_<< x.a2_<< x.a3_<< x.a4_<< x.a5_<< x.a6_;
return os;
}
template <class T1,class T2,class T3,class T4,class T5,class T6,class T7>
struct group7
{
T1 a1_;
T2 a2_;
T3 a3_;
T4 a4_;
T5 a5_;
T6 a6_;
T7 a7_;
group7(T1 a1,T2 a2,T3 a3,T4 a4,T5 a5,T6 a6,T7 a7)
: a1_(a1),a2_(a2),a3_(a3),a4_(a4),a5_(a5),a6_(a6),a7_(a7)
{}
};
template <class Ch, class Tr, class T1,class T2,class T3,class T4,class T5,class T6,class T7>
inline
BOOST_IO_STD ostream&
operator << (BOOST_IO_STD ostream& os,
const group7<T1,T2,T3,T4,T5,T6,T7>& x)
{
os << x.a1_<< x.a2_<< x.a3_<< x.a4_<< x.a5_<< x.a6_<< x.a7_;
return os;
}
template <class T1,class T2,class T3,class T4,class T5,class T6,class T7,class T8>
struct group8
{
T1 a1_;
T2 a2_;
T3 a3_;
T4 a4_;
T5 a5_;
T6 a6_;
T7 a7_;
T8 a8_;
group8(T1 a1,T2 a2,T3 a3,T4 a4,T5 a5,T6 a6,T7 a7,T8 a8)
: a1_(a1),a2_(a2),a3_(a3),a4_(a4),a5_(a5),a6_(a6),a7_(a7),a8_(a8)
{}
};
template <class Ch, class Tr, class T1,class T2,class T3,class T4,class T5,class T6,class T7,class T8>
inline
BOOST_IO_STD ostream&
operator << (BOOST_IO_STD ostream& os,
const group8<T1,T2,T3,T4,T5,T6,T7,T8>& x)
{
os << x.a1_<< x.a2_<< x.a3_<< x.a4_<< x.a5_<< x.a6_<< x.a7_<< x.a8_;
return os;
}
template <class T1,class T2,class T3,class T4,class T5,class T6,class T7,class T8,class T9>
struct group9
{
T1 a1_;
T2 a2_;
T3 a3_;
T4 a4_;
T5 a5_;
T6 a6_;
T7 a7_;
T8 a8_;
T9 a9_;
group9(T1 a1,T2 a2,T3 a3,T4 a4,T5 a5,T6 a6,T7 a7,T8 a8,T9 a9)
: a1_(a1),a2_(a2),a3_(a3),a4_(a4),a5_(a5),a6_(a6),a7_(a7),a8_(a8),a9_(a9)
{}
};
template <class Ch, class Tr, class T1,class T2,class T3,class T4,class T5,class T6,class T7,class T8,class T9>
inline
BOOST_IO_STD ostream&
operator << (BOOST_IO_STD ostream& os,
const group9<T1,T2,T3,T4,T5,T6,T7,T8,T9>& x)
{
os << x.a1_<< x.a2_<< x.a3_<< x.a4_<< x.a5_<< x.a6_<< x.a7_<< x.a8_<< x.a9_;
return os;
}
template <class T1,class T2,class T3,class T4,class T5,class T6,class T7,class T8,class T9,class T10>
struct group10
{
T1 a1_;
T2 a2_;
T3 a3_;
T4 a4_;
T5 a5_;
T6 a6_;
T7 a7_;
T8 a8_;
T9 a9_;
T10 a10_;
group10(T1 a1,T2 a2,T3 a3,T4 a4,T5 a5,T6 a6,T7 a7,T8 a8,T9 a9,T10 a10)
: a1_(a1),a2_(a2),a3_(a3),a4_(a4),a5_(a5),a6_(a6),a7_(a7),a8_(a8),a9_(a9),a10_(a10)
{}
};
template <class Ch, class Tr, class T1,class T2,class T3,class T4,class T5,class T6,class T7,class T8,class T9,class T10>
inline
BOOST_IO_STD ostream&
operator << (BOOST_IO_STD ostream& os,
const group10<T1,T2,T3,T4,T5,T6,T7,T8,T9,T10>& x)
{
os << x.a1_<< x.a2_<< x.a3_<< x.a4_<< x.a5_<< x.a6_<< x.a7_<< x.a8_<< x.a9_<< x.a10_;
return os;
}
template <class T1,class T2>
inline
group1<T1>
group_head( group2<T1,T2> const& x)
{
return group1<T1> (x.a1_);
}
template <class T1,class T2>
inline
group1<T2>
group_last( group2<T1,T2> const& x)
{
return group1<T2> (x.a2_);
}
template <class T1,class T2,class T3>
inline
group2<T1,T2>
group_head( group3<T1,T2,T3> const& x)
{
return group2<T1,T2> (x.a1_,x.a2_);
}
template <class T1,class T2,class T3>
inline
group1<T3>
group_last( group3<T1,T2,T3> const& x)
{
return group1<T3> (x.a3_);
}
template <class T1,class T2,class T3,class T4>
inline
group3<T1,T2,T3>
group_head( group4<T1,T2,T3,T4> const& x)
{
return group3<T1,T2,T3> (x.a1_,x.a2_,x.a3_);
}
template <class T1,class T2,class T3,class T4>
inline
group1<T4>
group_last( group4<T1,T2,T3,T4> const& x)
{
return group1<T4> (x.a4_);
}
template <class T1,class T2,class T3,class T4,class T5>
inline
group4<T1,T2,T3,T4>
group_head( group5<T1,T2,T3,T4,T5> const& x)
{
return group4<T1,T2,T3,T4> (x.a1_,x.a2_,x.a3_,x.a4_);
}
template <class T1,class T2,class T3,class T4,class T5>
inline
group1<T5>
group_last( group5<T1,T2,T3,T4,T5> const& x)
{
return group1<T5> (x.a5_);
}
template <class T1,class T2,class T3,class T4,class T5,class T6>
inline
group5<T1,T2,T3,T4,T5>
group_head( group6<T1,T2,T3,T4,T5,T6> const& x)
{
return group5<T1,T2,T3,T4,T5> (x.a1_,x.a2_,x.a3_,x.a4_,x.a5_);
}
template <class T1,class T2,class T3,class T4,class T5,class T6>
inline
group1<T6>
group_last( group6<T1,T2,T3,T4,T5,T6> const& x)
{
return group1<T6> (x.a6_);
}
template <class T1,class T2,class T3,class T4,class T5,class T6,class T7>
inline
group6<T1,T2,T3,T4,T5,T6>
group_head( group7<T1,T2,T3,T4,T5,T6,T7> const& x)
{
return group6<T1,T2,T3,T4,T5,T6> (x.a1_,x.a2_,x.a3_,x.a4_,x.a5_,x.a6_);
}
template <class T1,class T2,class T3,class T4,class T5,class T6,class T7>
inline
group1<T7>
group_last( group7<T1,T2,T3,T4,T5,T6,T7> const& x)
{
return group1<T7> (x.a7_);
}
template <class T1,class T2,class T3,class T4,class T5,class T6,class T7,class T8>
inline
group7<T1,T2,T3,T4,T5,T6,T7>
group_head( group8<T1,T2,T3,T4,T5,T6,T7,T8> const& x)
{
return group7<T1,T2,T3,T4,T5,T6,T7> (x.a1_,x.a2_,x.a3_,x.a4_,x.a5_,x.a6_,x.a7_);
}
template <class T1,class T2,class T3,class T4,class T5,class T6,class T7,class T8>
inline
group1<T8>
group_last( group8<T1,T2,T3,T4,T5,T6,T7,T8> const& x)
{
return group1<T8> (x.a8_);
}
template <class T1,class T2,class T3,class T4,class T5,class T6,class T7,class T8,class T9>
inline
group8<T1,T2,T3,T4,T5,T6,T7,T8>
group_head( group9<T1,T2,T3,T4,T5,T6,T7,T8,T9> const& x)
{
return group8<T1,T2,T3,T4,T5,T6,T7,T8> (x.a1_,x.a2_,x.a3_,x.a4_,x.a5_,x.a6_,x.a7_,x.a8_);
}
template <class T1,class T2,class T3,class T4,class T5,class T6,class T7,class T8,class T9>
inline
group1<T9>
group_last( group9<T1,T2,T3,T4,T5,T6,T7,T8,T9> const& x)
{
return group1<T9> (x.a9_);
}
template <class T1,class T2,class T3,class T4,class T5,class T6,class T7,class T8,class T9,class T10>
inline
group9<T1,T2,T3,T4,T5,T6,T7,T8,T9>
group_head( group10<T1,T2,T3,T4,T5,T6,T7,T8,T9,T10> const& x)
{
return group9<T1,T2,T3,T4,T5,T6,T7,T8,T9> (x.a1_,x.a2_,x.a3_,x.a4_,x.a5_,x.a6_,x.a7_,x.a8_,x.a9_);
}
template <class T1,class T2,class T3,class T4,class T5,class T6,class T7,class T8,class T9,class T10>
inline
group1<T10>
group_last( group10<T1,T2,T3,T4,T5,T6,T7,T8,T9,T10> const& x)
{
return group1<T10> (x.a10_);
}
} // namespace detail
// helper functions
inline detail::group1< detail::group0 >
group() { return detail::group1< detail::group0 > ( detail::group0() ); }
template <class T1, class Var>
inline
detail::group1< detail::group2<T1, Var const&> >
group(T1 a1, Var const& var)
{
return detail::group1< detail::group2<T1, Var const&> >
( detail::group2<T1, Var const&>
(a1, var)
);
}
template <class T1,class T2, class Var>
inline
detail::group1< detail::group3<T1,T2, Var const&> >
group(T1 a1,T2 a2, Var const& var)
{
return detail::group1< detail::group3<T1,T2, Var const&> >
( detail::group3<T1,T2, Var const&>
(a1,a2, var)
);
}
template <class T1,class T2,class T3, class Var>
inline
detail::group1< detail::group4<T1,T2,T3, Var const&> >
group(T1 a1,T2 a2,T3 a3, Var const& var)
{
return detail::group1< detail::group4<T1,T2,T3, Var const&> >
( detail::group4<T1,T2,T3, Var const&>
(a1,a2,a3, var)
);
}
template <class T1,class T2,class T3,class T4, class Var>
inline
detail::group1< detail::group5<T1,T2,T3,T4, Var const&> >
group(T1 a1,T2 a2,T3 a3,T4 a4, Var const& var)
{
return detail::group1< detail::group5<T1,T2,T3,T4, Var const&> >
( detail::group5<T1,T2,T3,T4, Var const&>
(a1,a2,a3,a4, var)
);
}
template <class T1,class T2,class T3,class T4,class T5, class Var>
inline
detail::group1< detail::group6<T1,T2,T3,T4,T5, Var const&> >
group(T1 a1,T2 a2,T3 a3,T4 a4,T5 a5, Var const& var)
{
return detail::group1< detail::group6<T1,T2,T3,T4,T5, Var const&> >
( detail::group6<T1,T2,T3,T4,T5, Var const&>
(a1,a2,a3,a4,a5, var)
);
}
template <class T1,class T2,class T3,class T4,class T5,class T6, class Var>
inline
detail::group1< detail::group7<T1,T2,T3,T4,T5,T6, Var const&> >
group(T1 a1,T2 a2,T3 a3,T4 a4,T5 a5,T6 a6, Var const& var)
{
return detail::group1< detail::group7<T1,T2,T3,T4,T5,T6, Var const&> >
( detail::group7<T1,T2,T3,T4,T5,T6, Var const&>
(a1,a2,a3,a4,a5,a6, var)
);
}
template <class T1,class T2,class T3,class T4,class T5,class T6,class T7, class Var>
inline
detail::group1< detail::group8<T1,T2,T3,T4,T5,T6,T7, Var const&> >
group(T1 a1,T2 a2,T3 a3,T4 a4,T5 a5,T6 a6,T7 a7, Var const& var)
{
return detail::group1< detail::group8<T1,T2,T3,T4,T5,T6,T7, Var const&> >
( detail::group8<T1,T2,T3,T4,T5,T6,T7, Var const&>
(a1,a2,a3,a4,a5,a6,a7, var)
);
}
template <class T1,class T2,class T3,class T4,class T5,class T6,class T7,class T8, class Var>
inline
detail::group1< detail::group9<T1,T2,T3,T4,T5,T6,T7,T8, Var const&> >
group(T1 a1,T2 a2,T3 a3,T4 a4,T5 a5,T6 a6,T7 a7,T8 a8, Var const& var)
{
return detail::group1< detail::group9<T1,T2,T3,T4,T5,T6,T7,T8, Var const&> >
( detail::group9<T1,T2,T3,T4,T5,T6,T7,T8, Var const&>
(a1,a2,a3,a4,a5,a6,a7,a8, var)
);
}
template <class T1,class T2,class T3,class T4,class T5,class T6,class T7,class T8,class T9, class Var>
inline
detail::group1< detail::group10<T1,T2,T3,T4,T5,T6,T7,T8,T9, Var const&> >
group(T1 a1,T2 a2,T3 a3,T4 a4,T5 a5,T6 a6,T7 a7,T8 a8,T9 a9, Var const& var)
{
return detail::group1< detail::group10<T1,T2,T3,T4,T5,T6,T7,T8,T9, Var const&> >
( detail::group10<T1,T2,T3,T4,T5,T6,T7,T8,T9, Var const&>
(a1,a2,a3,a4,a5,a6,a7,a8,a9, var)
);
}
#ifndef BOOST_NO_OVERLOAD_FOR_NON_CONST
template <class T1, class Var>
inline
detail::group1< detail::group2<T1, Var&> >
group(T1 a1, Var& var)
{
return detail::group1< detail::group2<T1, Var&> >
( detail::group2<T1, Var&>
(a1, var)
);
}
template <class T1,class T2, class Var>
inline
detail::group1< detail::group3<T1,T2, Var&> >
group(T1 a1,T2 a2, Var& var)
{
return detail::group1< detail::group3<T1,T2, Var&> >
( detail::group3<T1,T2, Var&>
(a1,a2, var)
);
}
template <class T1,class T2,class T3, class Var>
inline
detail::group1< detail::group4<T1,T2,T3, Var&> >
group(T1 a1,T2 a2,T3 a3, Var& var)
{
return detail::group1< detail::group4<T1,T2,T3, Var&> >
( detail::group4<T1,T2,T3, Var&>
(a1,a2,a3, var)
);
}
template <class T1,class T2,class T3,class T4, class Var>
inline
detail::group1< detail::group5<T1,T2,T3,T4, Var&> >
group(T1 a1,T2 a2,T3 a3,T4 a4, Var& var)
{
return detail::group1< detail::group5<T1,T2,T3,T4, Var&> >
( detail::group5<T1,T2,T3,T4, Var&>
(a1,a2,a3,a4, var)
);
}
template <class T1,class T2,class T3,class T4,class T5, class Var>
inline
detail::group1< detail::group6<T1,T2,T3,T4,T5, Var&> >
group(T1 a1,T2 a2,T3 a3,T4 a4,T5 a5, Var& var)
{
return detail::group1< detail::group6<T1,T2,T3,T4,T5, Var&> >
( detail::group6<T1,T2,T3,T4,T5, Var&>
(a1,a2,a3,a4,a5, var)
);
}
template <class T1,class T2,class T3,class T4,class T5,class T6, class Var>
inline
detail::group1< detail::group7<T1,T2,T3,T4,T5,T6, Var&> >
group(T1 a1,T2 a2,T3 a3,T4 a4,T5 a5,T6 a6, Var& var)
{
return detail::group1< detail::group7<T1,T2,T3,T4,T5,T6, Var&> >
( detail::group7<T1,T2,T3,T4,T5,T6, Var&>
(a1,a2,a3,a4,a5,a6, var)
);
}
template <class T1,class T2,class T3,class T4,class T5,class T6,class T7, class Var>
inline
detail::group1< detail::group8<T1,T2,T3,T4,T5,T6,T7, Var&> >
group(T1 a1,T2 a2,T3 a3,T4 a4,T5 a5,T6 a6,T7 a7, Var& var)
{
return detail::group1< detail::group8<T1,T2,T3,T4,T5,T6,T7, Var&> >
( detail::group8<T1,T2,T3,T4,T5,T6,T7, Var&>
(a1,a2,a3,a4,a5,a6,a7, var)
);
}
template <class T1,class T2,class T3,class T4,class T5,class T6,class T7,class T8, class Var>
inline
detail::group1< detail::group9<T1,T2,T3,T4,T5,T6,T7,T8, Var&> >
group(T1 a1,T2 a2,T3 a3,T4 a4,T5 a5,T6 a6,T7 a7,T8 a8, Var& var)
{
return detail::group1< detail::group9<T1,T2,T3,T4,T5,T6,T7,T8, Var&> >
( detail::group9<T1,T2,T3,T4,T5,T6,T7,T8, Var&>
(a1,a2,a3,a4,a5,a6,a7,a8, var)
);
}
template <class T1,class T2,class T3,class T4,class T5,class T6,class T7,class T8,class T9, class Var>
inline
detail::group1< detail::group10<T1,T2,T3,T4,T5,T6,T7,T8,T9, Var&> >
group(T1 a1,T2 a2,T3 a3,T4 a4,T5 a5,T6 a6,T7 a7,T8 a8,T9 a9, Var& var)
{
return detail::group1< detail::group10<T1,T2,T3,T4,T5,T6,T7,T8,T9, Var&> >
( detail::group10<T1,T2,T3,T4,T5,T6,T7,T8,T9, Var&>
(a1,a2,a3,a4,a5,a6,a7,a8,a9, var)
);
}
#endif //end- #ifndef BOOST_NO_OVERLOAD_FOR_NON_CONST
} // namespace io
} // namespace boost
#endif // BOOST_FORMAT_GROUP_HPP

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// -*- C++ -*-
// Boost general library 'format' ---------------------------
// See http://www.boost.org for updates, documentation, and revision history.
// (C) Samuel Krempp 2001
// krempp@crans.ens-cachan.fr
// Permission to copy, use, modify, sell and
// distribute this software is granted provided this copyright notice appears
// in all copies. This software is provided "as is" without express or implied
// warranty, and with no claim as to its suitability for any purpose.
// ideas taken from Rüdiger Loos's format class
// and Karl Nelson's ofstream
// ----------------------------------------------------------------------------
// internals.hpp : internal structs. included by format.hpp
// stream_format_state, and format_item
// ----------------------------------------------------------------------------
#ifndef BOOST_FORMAT_INTERNALS_HPP
#define BOOST_FORMAT_INTERNALS_HPP
#include <string>
#include <sstream>
namespace boost {
namespace io {
namespace detail {
// --------------
// set of params that define the format state of a stream
struct stream_format_state
{
typedef std::ios basic_ios;
std::streamsize width_;
std::streamsize precision_;
char fill_;
std::ios::fmtflags flags_;
stream_format_state() : width_(-1), precision_(-1), fill_(0), flags_(std::ios::dec) {}
stream_format_state(basic_ios& os) {set_by_stream(os); }
void apply_on(basic_ios & os) const; //- applies format_state to the stream
template<class T> void apply_manip(T manipulator) //- modifies state by applying manipulator.
{ apply_manip_body<T>( *this, manipulator) ; }
void reset(); //- sets to default state.
void set_by_stream(const basic_ios& os); //- sets to os's state.
};
// --------------
// format_item : stores all parameters that can be defined by directives in the format-string
struct format_item
{
enum pad_values { zeropad = 1, spacepad =2, centered=4, tabulation = 8 };
enum arg_values { argN_no_posit = -1, // non-positional directive. argN will be set later.
argN_tabulation = -2, // tabulation directive. (no argument read)
argN_ignored = -3 // ignored directive. (no argument read)
};
typedef BOOST_IO_STD ios basic_ios;
typedef detail::stream_format_state stream_format_state;
typedef std::string string_t;
typedef BOOST_IO_STD ostringstream internal_stream_t;
int argN_; //- argument number (starts at 0, eg : %1 => argN=0)
// negative values are used for items that don't process
// an argument
string_t res_; //- result of the formatting of this item
string_t appendix_; //- piece of string between this item and the next
stream_format_state ref_state_;// set by parsing the format_string, is only affected by modify_item
stream_format_state state_; // always same as ref_state, _unless_ modified by manipulators 'group(..)'
// non-stream format-state parameters
signed int truncate_; //- is >=0 for directives like %.5s (take 5 chars from the string)
unsigned int pad_scheme_; //- several possible padding schemes can mix. see pad_values
format_item() : argN_(argN_no_posit), truncate_(-1), pad_scheme_(0) {}
void compute_states(); // sets states according to truncate and pad_scheme.
};
// -----------------------------------------------------------
// Definitions
// -----------------------------------------------------------
// --- stream_format_state:: -------------------------------------------
inline
void stream_format_state::apply_on(basic_ios & os) const
// set the state of this stream according to our params
{
if(width_ != -1)
os.width(width_);
if(precision_ != -1)
os.precision(precision_);
if(fill_ != 0)
os.fill(fill_);
os.flags(flags_);
}
inline
void stream_format_state::set_by_stream(const basic_ios& os)
// set our params according to the state of this stream
{
flags_ = os.flags();
width_ = os.width();
precision_ = os.precision();
fill_ = os.fill();
}
template<class T> inline
void apply_manip_body( stream_format_state& self,
T manipulator)
// modify our params according to the manipulator
{
BOOST_IO_STD stringstream ss;
self.apply_on( ss );
ss << manipulator;
self.set_by_stream( ss );
}
inline
void stream_format_state::reset()
// set our params to standard's default state
{
width_=-1; precision_=-1; fill_=0;
flags_ = std::ios::dec;
}
// --- format_items:: -------------------------------------------
inline
void format_item::compute_states()
// reflect pad_scheme_ on state_ and ref_state_
// because some pad_schemes has complex consequences on several state params.
{
if(pad_scheme_ & zeropad)
{
if(ref_state_.flags_ & std::ios::left)
{
pad_scheme_ = pad_scheme_ & (~zeropad); // ignore zeropad in left alignment
}
else
{
ref_state_.fill_='0';
ref_state_.flags_ |= std::ios::internal;
}
}
state_ = ref_state_;
}
} } } // namespaces boost :: io :: detail
#endif // BOOST_FORMAT_INTERNALS_HPP

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// -*- C++ -*-
// Boost general library 'format' ---------------------------
// See http://www.boost.org for updates, documentation, and revision history.
// (C) Samuel Krempp 2001
// krempp@crans.ens-cachan.fr
// Permission to copy, use, modify, sell and
// distribute this software is granted provided this copyright notice appears
// in all copies. This software is provided "as is" without express or implied
// warranty, and with no claim as to its suitability for any purpose.
// ideas taken from Rüdiger Loos's format class
// and Karl Nelson's ofstream (also took its parsing code as basis for printf parsing)
// ------------------------------------------------------------------------------
// internals_fwd.hpp : forward declarations, for internal headers
// ------------------------------------------------------------------------------
#ifndef BOOST_FORMAT_INTERNAL_FWD_HPP
#define BOOST_FORMAT_INTERNAL_FWD_HPP
#include "boost/format/format_fwd.hpp"
namespace boost {
namespace io {
namespace detail {
struct stream_format_state;
struct format_item;
}
namespace detail {
// these functions were intended as methods,
// but MSVC have problems with template member functions :
// defined in format_implementation.hpp :
template<class T>
basic_format& modify_item_body( basic_format& self,
int itemN, const T& manipulator);
template<class T>
basic_format& bind_arg_body( basic_format& self,
int argN, const T& val);
template<class T>
void apply_manip_body( stream_format_state& self,
T manipulator);
// argument feeding (defined in feed_args.hpp ) :
template<class T>
void distribute(basic_format& self, T x);
template<class T>
basic_format& feed(basic_format& self, T x);
} // namespace detail
} // namespace io
} // namespace boost
#endif // BOOST_FORMAT_INTERNAL_FWD_HPP

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// -*- C++ -*-
// Boost general library 'format' ---------------------------
// See http://www.boost.org for updates, documentation, and revision history.
// (C) Samuel Krempp 2001
// krempp@crans.ens-cachan.fr
// Permission to copy, use, modify, sell and
// distribute this software is granted provided this copyright notice appears
// in all copies. This software is provided "as is" without express or implied
// warranty, and with no claim as to its suitability for any purpose.
// ideas taken from Rüdiger Loos's format class
// and Karl Nelson's ofstream (also took its parsing code as basis for printf parsing)
// ------------------------------------------------------------------------------
// macros_default.hpp : configuration for the format library
// provides default values for the stl workaround macros
// ------------------------------------------------------------------------------
#ifndef BOOST_FORMAT_MACROS_DEFAULT_HPP
#define BOOST_FORMAT_MACROS_DEFAULT_HPP
// *** This should go to "boost/config/suffix.hpp".
#ifndef BOOST_IO_STD
# define BOOST_IO_STD std::
#endif
// **** Workaround for io streams, stlport and msvc.
#ifdef BOOST_IO_NEEDS_USING_DECLARATION
namespace boost {
using std::char_traits;
using std::basic_ostream;
using std::basic_ostringstream;
namespace io {
using std::basic_ostream;
namespace detail {
using std::basic_ios;
using std::basic_ostream;
using std::basic_ostringstream;
}
}
}
#endif
// ------------------------------------------------------------------------------
#endif // BOOST_FORMAT_MACROS_DEFAULT_HPP

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// -*- C++ -*-
// Boost general library 'format' ---------------------------
// See http://www.boost.org for updates, documentation, and revision history.
// (C) Samuel Krempp 2001
// krempp@crans.ens-cachan.fr
// Permission to copy, use, modify, sell and
// distribute this software is granted provided this copyright notice appears
// in all copies. This software is provided "as is" without express or implied
// warranty, and with no claim as to its suitability for any purpose.
// ideas taken from Rudiger Loos's format class
// and Karl Nelson's ofstream (also took its parsing code as basis for printf parsing)
// ------------------------------------------------------------------------------
// parsing.hpp : implementation of the parsing member functions
// ( parse, parse_printf_directive)
// ------------------------------------------------------------------------------
#ifndef BOOST_FORMAT_PARSING_HPP
#define BOOST_FORMAT_PARSING_HPP
#include <boost/format.hpp>
#include <boost/throw_exception.hpp>
#include <boost/assert.hpp>
namespace boost {
namespace io {
namespace detail {
template<class Stream> inline
bool wrap_isdigit(char c, Stream &os)
{
#ifndef BOOST_NO_LOCALE_ISIDIGIT
return std::isdigit(c, os.rdbuf()->getloc() );
# else
using namespace std;
return isdigit(c);
#endif
} //end- wrap_isdigit(..)
template<class Res> inline
Res str2int(const std::string& s,
std::string::size_type start,
BOOST_IO_STD ios &os,
const Res = Res(0) )
// Input : char string, with starting index
// a basic_ios& merely to call its widen/narrow member function in the desired locale.
// Effects : reads s[start:] and converts digits into an integral n, of type Res
// Returns : n
{
Res n = 0;
while(start<s.size() && wrap_isdigit(s[start], os) ) {
char cur_ch = s[start];
BOOST_ASSERT(cur_ch != 0 ); // since we called isdigit, this should not happen.
n *= 10;
n += cur_ch - '0'; // 22.2.1.1.2 of the C++ standard
++start;
}
return n;
}
void skip_asterisk(const std::string & buf,
std::string::size_type * pos_p,
BOOST_IO_STD ios &os)
// skip printf's "asterisk-fields" directives in the format-string buf
// Input : char string, with starting index *pos_p
// a basic_ios& merely to call its widen/narrow member function in the desired locale.
// Effects : advance *pos_p by skipping printf's asterisk fields.
// Returns : nothing
{
using namespace std;
BOOST_ASSERT( pos_p != 0);
if(*pos_p >= buf.size() ) return;
if(buf[ *pos_p]=='*') {
++ (*pos_p);
while (*pos_p < buf.size() && wrap_isdigit(buf[*pos_p],os)) ++(*pos_p);
if(buf[*pos_p]=='$') ++(*pos_p);
}
}
inline void maybe_throw_exception( unsigned char exceptions)
// auxiliary func called by parse_printf_directive
// for centralising error handling
// it either throws if user sets the corresponding flag, or does nothing.
{
if(exceptions & io::bad_format_string_bit)
boost::throw_exception(io::bad_format_string());
}
bool parse_printf_directive(const std::string & buf,
std::string::size_type * pos_p,
detail::format_item * fpar,
BOOST_IO_STD ios &os,
unsigned char exceptions)
// Input : a 'printf-directive' in the format-string, starting at buf[ *pos_p ]
// a basic_ios& merely to call its widen/narrow member function in the desired locale.
// a bitset'excpetions' telling whether to throw exceptions on errors.
// Returns : true if parse somehow succeeded (possibly ignoring errors if exceptions disabled)
// false if it failed so bad that the directive should be printed verbatim
// Effects : - *pos_p is incremented so that buf[*pos_p] is the first char after the directive
// - *fpar is set with the parameters read in the directive
{
typedef format_item format_item_t;
BOOST_ASSERT( pos_p != 0);
std::string::size_type &i1 = *pos_p,
i0;
fpar->argN_ = format_item_t::argN_no_posit; // if no positional-directive
bool in_brackets=false;
if(buf[i1]=='|')
{
in_brackets=true;
if( ++i1 >= buf.size() ) {
maybe_throw_exception(exceptions);
return false;
}
}
// the flag '0' would be picked as a digit for argument order, but here it's a flag :
if(buf[i1]=='0')
goto parse_flags;
// handle argument order (%2$d) or possibly width specification: %2d
i0 = i1; // save position before digits
while (i1 < buf.size() && wrap_isdigit(buf[i1], os))
++i1;
if (i1!=i0)
{
if( i1 >= buf.size() ) {
maybe_throw_exception(exceptions);
return false;
}
int n=str2int(buf,i0, os, int(0) );
// %N% case : this is already the end of the directive
if( buf[i1] == '%' )
{
fpar->argN_ = n-1;
++i1;
if( in_brackets)
maybe_throw_exception(exceptions);
// but don't return. maybe "%" was used in lieu of '$', so we go on.
else return true;
}
if ( buf[i1]=='$' )
{
fpar->argN_ = n-1;
++i1;
}
else
{
// non-positionnal directive
fpar->ref_state_.width_ = n;
fpar->argN_ = format_item_t::argN_no_posit;
goto parse_precision;
}
}
parse_flags:
// handle flags
while ( i1 <buf.size()) // as long as char is one of + - = # 0 l h or ' '
{
// misc switches
switch (buf[i1])
{
case '\'' : break; // no effect yet. (painful to implement)
case 'l':
case 'h': // short/long modifier : for printf-comaptibility (no action needed)
break;
case '-':
fpar->ref_state_.flags_ |= std::ios::left;
break;
case '=':
fpar->pad_scheme_ |= format_item_t::centered;
break;
case ' ':
fpar->pad_scheme_ |= format_item_t::spacepad;
break;
case '+':
fpar->ref_state_.flags_ |= std::ios::showpos;
break;
case '0':
fpar->pad_scheme_ |= format_item_t::zeropad;
// need to know alignment before really setting flags,
// so just add 'zeropad' flag for now, it will be processed later.
break;
case '#':
fpar->ref_state_.flags_ |= std::ios::showpoint | std::ios::showbase;
break;
default:
goto parse_width;
}
++i1;
} // loop on flag.
if( i1>=buf.size()) {
maybe_throw_exception(exceptions);
return true;
}
parse_width:
// handle width spec
skip_asterisk(buf, &i1, os); // skips 'asterisk fields' : *, or *N$
i0 = i1; // save position before digits
while (i1<buf.size() && wrap_isdigit(buf[i1], os))
i1++;
if (i1!=i0)
{ fpar->ref_state_.width_ = str2int( buf,i0, os, std::streamsize(0) ); }
parse_precision:
if( i1>=buf.size()) {
maybe_throw_exception(exceptions);
return true;
}
// handle precision spec
if (buf[i1]=='.')
{
++i1;
skip_asterisk(buf, &i1, os);
i0 = i1; // save position before digits
while (i1<buf.size() && wrap_isdigit(buf[i1], os))
++i1;
if(i1==i0)
fpar->ref_state_.precision_ = 0;
else
fpar->ref_state_.precision_ = str2int(buf,i0, os, std::streamsize(0) );
}
// handle formatting-type flags :
while( i1<buf.size() &&
( buf[i1]=='l' || buf[i1]=='L' || buf[i1]=='h') )
++i1;
if( i1>=buf.size()) {
maybe_throw_exception(exceptions);
return true;
}
if( in_brackets && buf[i1]=='|' )
{
++i1;
return true;
}
switch (buf[i1])
{
case 'X':
fpar->ref_state_.flags_ |= std::ios::uppercase;
case 'p': // pointer => set hex.
case 'x':
fpar->ref_state_.flags_ &= ~std::ios::basefield;
fpar->ref_state_.flags_ |= std::ios::hex;
break;
case 'o':
fpar->ref_state_.flags_ &= ~std::ios::basefield;
fpar->ref_state_.flags_ |= std::ios::oct;
break;
case 'E':
fpar->ref_state_.flags_ |= std::ios::uppercase;
case 'e':
fpar->ref_state_.flags_ &= ~std::ios::floatfield;
fpar->ref_state_.flags_ |= std::ios::scientific;
fpar->ref_state_.flags_ &= ~std::ios::basefield;
fpar->ref_state_.flags_ |= std::ios::dec;
break;
case 'f':
fpar->ref_state_.flags_ &= ~std::ios::floatfield;
fpar->ref_state_.flags_ |= std::ios::fixed;
case 'u':
case 'd':
case 'i':
fpar->ref_state_.flags_ &= ~std::ios::basefield;
fpar->ref_state_.flags_ |= std::ios::dec;
break;
case 'T':
++i1;
if( i1 >= buf.size())
maybe_throw_exception(exceptions);
else
fpar->ref_state_.fill_ = buf[i1];
fpar->pad_scheme_ |= format_item_t::tabulation;
fpar->argN_ = format_item_t::argN_tabulation;
break;
case 't':
fpar->ref_state_.fill_ = ' ';
fpar->pad_scheme_ |= format_item_t::tabulation;
fpar->argN_ = format_item_t::argN_tabulation;
break;
case 'G':
fpar->ref_state_.flags_ |= std::ios::uppercase;
break;
case 'g': // 'g' conversion is default for floats.
fpar->ref_state_.flags_ &= ~std::ios::basefield;
fpar->ref_state_.flags_ |= std::ios::dec;
// CLEAR all floatield flags, so stream will CHOOSE
fpar->ref_state_.flags_ &= ~std::ios::floatfield;
break;
case 'C':
case 'c':
fpar->truncate_ = 1;
break;
case 'S':
case 's':
fpar->truncate_ = fpar->ref_state_.precision_;
fpar->ref_state_.precision_ = -1;
break;
case 'n' :
fpar->argN_ = format_item_t::argN_ignored;
break;
default:
maybe_throw_exception(exceptions);
}
++i1;
if( in_brackets )
{
if( i1<buf.size() && buf[i1]=='|' )
{
++i1;
return true;
}
else maybe_throw_exception(exceptions);
}
return true;
}
} // detail namespace
} // io namespace
// -----------------------------------------------
// format :: parse(..)
void basic_format::parse(const string_t & buf)
// parse the format-string
{
using namespace std;
const char arg_mark = '%';
bool ordered_args=true;
int max_argN=-1;
string_t::size_type i1=0;
int num_items=0;
// A: find upper_bound on num_items and allocates arrays
i1=0;
while( (i1=buf.find(arg_mark,i1)) != string::npos )
{
if( i1+1 >= buf.size() ) {
if(exceptions() & io::bad_format_string_bit)
boost::throw_exception(io::bad_format_string()); // must not end in "bla bla %"
else break; // stop there, ignore last '%'
}
if(buf[i1+1] == buf[i1] ) { i1+=2; continue; } // escaped "%%" / "##"
++i1;
// in case of %N% directives, dont count it double (wastes allocations..) :
while(i1 < buf.size() && io::detail::wrap_isdigit(buf[i1],oss_)) ++i1;
if( i1 < buf.size() && buf[i1] == arg_mark ) ++ i1;
++num_items;
}
items_.assign( num_items, format_item_t() );
// B: Now the real parsing of the format string :
num_items=0;
i1 = 0;
string_t::size_type i0 = i1;
bool special_things=false;
int cur_it=0;
while( (i1=buf.find(arg_mark,i1)) != string::npos )
{
string_t & piece = (cur_it==0) ? prefix_ : items_[cur_it-1].appendix_;
if( buf[i1+1] == buf[i1] ) // escaped mark, '%%'
{
piece += buf.substr(i0, i1-i0) + buf[i1];
i1+=2; i0=i1;
continue;
}
BOOST_ASSERT( static_cast<unsigned int>(cur_it) < items_.size() || cur_it==0);
if(i1!=i0) piece += buf.substr(i0, i1-i0);
++i1;
bool parse_ok;
parse_ok = io::detail::parse_printf_directive(buf, &i1, &items_[cur_it], oss_, exceptions());
if( ! parse_ok ) continue; // the directive will be printed verbatim
i0=i1;
items_[cur_it].compute_states(); // process complex options, like zeropad, into stream params.
int argN=items_[cur_it].argN_;
if(argN == format_item_t::argN_ignored)
continue;
if(argN ==format_item_t::argN_no_posit)
ordered_args=false;
else if(argN == format_item_t::argN_tabulation) special_things=true;
else if(argN > max_argN) max_argN = argN;
++num_items;
++cur_it;
} // loop on %'s
BOOST_ASSERT(cur_it == num_items);
// store the final piece of string
string_t & piece = (cur_it==0) ? prefix_ : items_[cur_it-1].appendix_;
piece += buf.substr(i0);
if( !ordered_args)
{
if(max_argN >= 0 ) // dont mix positional with non-positionnal directives
{
if(exceptions() & io::bad_format_string_bit)
boost::throw_exception(io::bad_format_string());
// else do nothing. => positionnal arguments are processed as non-positionnal
}
// set things like it would have been with positional directives :
int non_ordered_items = 0;
for(int i=0; i< num_items; ++i)
if(items_[i].argN_ == format_item_t::argN_no_posit)
{
items_[i].argN_ = non_ordered_items;
++non_ordered_items;
}
max_argN = non_ordered_items-1;
}
// C: set some member data :
items_.resize(num_items);
if(special_things) style_ |= special_needs;
num_args_ = max_argN + 1;
if(ordered_args) style_ |= ordered;
else style_ &= ~ordered;
}
} // namespace boost
#endif // BOOST_FORMAT_PARSING_HPP

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#ifndef BOOST_THROW_EXCEPTION_HPP_INCLUDED
#define BOOST_THROW_EXCEPTION_HPP_INCLUDED
// MS compatible compilers support #pragma once
#if defined(_MSC_VER) && (_MSC_VER >= 1020)
# pragma once
#endif
//
// boost/throw_exception.hpp
//
// Copyright (c) 2002 Peter Dimov and Multi Media Ltd.
//
// Permission to copy, use, modify, sell and distribute this software
// is granted provided this copyright notice appears in all copies.
// This software is provided "as is" without express or implied
// warranty, and with no claim as to its suitability for any purpose.
//
// http://www.boost.org/libs/utility/throw_exception.html
//
//#include <boost/config.hpp>
#ifdef BOOST_NO_EXCEPTIONS
# include <exception>
#endif
namespace boost
{
#ifdef BOOST_NO_EXCEPTIONS
void throw_exception(std::exception const & e); // user defined
#else
template<class E> void throw_exception(E const & e)
{
throw e;
}
#endif
} // namespace boost
#endif // #ifndef BOOST_THROW_EXCEPTION_HPP_INCLUDED

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#include "derivations.hh"
#include "store-api.hh"
#include "globals.hh"
#include "util.hh"
#include "misc.hh"
namespace nix {
void DerivationOutput::parseHashInfo(bool & recursive, HashType & hashType, Hash & hash) const
{
recursive = false;
string algo = hashAlgo;
if (string(algo, 0, 2) == "r:") {
recursive = true;
algo = string(algo, 2);
}
hashType = parseHashType(algo);
if (hashType == htUnknown)
throw Error(format("unknown hash algorithm `%1%'") % algo);
hash = parseHash(hashType, this->hash);
}
Path writeDerivation(StoreAPI & store,
const Derivation & drv, const string & name, bool repair)
{
PathSet references;
references.insert(drv.inputSrcs.begin(), drv.inputSrcs.end());
foreach (DerivationInputs::const_iterator, i, drv.inputDrvs)
references.insert(i->first);
/* Note that the outputs of a derivation are *not* references
(that can be missing (of course) and should not necessarily be
held during a garbage collection). */
string suffix = name + drvExtension;
string contents = unparseDerivation(drv);
return settings.readOnlyMode
? computeStorePathForText(suffix, contents, references)
: store.addTextToStore(suffix, contents, references, repair);
}
static Path parsePath(std::istream & str)
{
string s = parseString(str);
if (s.size() == 0 || s[0] != '/')
throw Error(format("bad path `%1%' in derivation") % s);
return s;
}
static StringSet parseStrings(std::istream & str, bool arePaths)
{
StringSet res;
while (!endOfList(str))
res.insert(arePaths ? parsePath(str) : parseString(str));
return res;
}
Derivation parseDerivation(const string & s)
{
Derivation drv;
std::istringstream str(s);
expect(str, "Derive([");
/* Parse the list of outputs. */
while (!endOfList(str)) {
DerivationOutput out;
expect(str, "("); string id = parseString(str);
expect(str, ","); out.path = parsePath(str);
expect(str, ","); out.hashAlgo = parseString(str);
expect(str, ","); out.hash = parseString(str);
expect(str, ")");
drv.outputs[id] = out;
}
/* Parse the list of input derivations. */
expect(str, ",[");
while (!endOfList(str)) {
expect(str, "(");
Path drvPath = parsePath(str);
expect(str, ",[");
drv.inputDrvs[drvPath] = parseStrings(str, false);
expect(str, ")");
}
expect(str, ",["); drv.inputSrcs = parseStrings(str, true);
expect(str, ","); drv.platform = parseString(str);
expect(str, ","); drv.builder = parseString(str);
/* Parse the builder arguments. */
expect(str, ",[");
while (!endOfList(str))
drv.args.push_back(parseString(str));
/* Parse the environment variables. */
expect(str, ",[");
while (!endOfList(str)) {
expect(str, "("); string name = parseString(str);
expect(str, ","); string value = parseString(str);
expect(str, ")");
drv.env[name] = value;
}
expect(str, ")");
return drv;
}
static void printString(string & res, const string & s)
{
res += '"';
for (const char * i = s.c_str(); *i; i++)
if (*i == '\"' || *i == '\\') { res += "\\"; res += *i; }
else if (*i == '\n') res += "\\n";
else if (*i == '\r') res += "\\r";
else if (*i == '\t') res += "\\t";
else res += *i;
res += '"';
}
template<class ForwardIterator>
static void printStrings(string & res, ForwardIterator i, ForwardIterator j)
{
res += '[';
bool first = true;
for ( ; i != j; ++i) {
if (first) first = false; else res += ',';
printString(res, *i);
}
res += ']';
}
string unparseDerivation(const Derivation & drv)
{
string s;
s.reserve(65536);
s += "Derive([";
bool first = true;
foreach (DerivationOutputs::const_iterator, i, drv.outputs) {
if (first) first = false; else s += ',';
s += '('; printString(s, i->first);
s += ','; printString(s, i->second.path);
s += ','; printString(s, i->second.hashAlgo);
s += ','; printString(s, i->second.hash);
s += ')';
}
s += "],[";
first = true;
foreach (DerivationInputs::const_iterator, i, drv.inputDrvs) {
if (first) first = false; else s += ',';
s += '('; printString(s, i->first);
s += ','; printStrings(s, i->second.begin(), i->second.end());
s += ')';
}
s += "],";
printStrings(s, drv.inputSrcs.begin(), drv.inputSrcs.end());
s += ','; printString(s, drv.platform);
s += ','; printString(s, drv.builder);
s += ','; printStrings(s, drv.args.begin(), drv.args.end());
s += ",[";
first = true;
foreach (StringPairs::const_iterator, i, drv.env) {
if (first) first = false; else s += ',';
s += '('; printString(s, i->first);
s += ','; printString(s, i->second);
s += ')';
}
s += "])";
return s;
}
bool isDerivation(const string & fileName)
{
return hasSuffix(fileName, drvExtension);
}
bool isFixedOutputDrv(const Derivation & drv)
{
return drv.outputs.size() == 1 &&
drv.outputs.begin()->first == "out" &&
drv.outputs.begin()->second.hash != "";
}
DrvHashes drvHashes;
/* Returns the hash of a derivation modulo fixed-output
subderivations. A fixed-output derivation is a derivation with one
output (`out') for which an expected hash and hash algorithm are
specified (using the `outputHash' and `outputHashAlgo'
attributes). We don't want changes to such derivations to
propagate upwards through the dependency graph, changing output
paths everywhere.
For instance, if we change the url in a call to the `fetchurl'
function, we do not want to rebuild everything depending on it
(after all, (the hash of) the file being downloaded is unchanged).
So the *output paths* should not change. On the other hand, the
*derivation paths* should change to reflect the new dependency
graph.
That's what this function does: it returns a hash which is just the
hash of the derivation ATerm, except that any input derivation
paths have been replaced by the result of a recursive call to this
function, and that for fixed-output derivations we return a hash of
its output path. */
Hash hashDerivationModulo(StoreAPI & store, Derivation drv)
{
/* Return a fixed hash for fixed-output derivations. */
if (isFixedOutputDrv(drv)) {
DerivationOutputs::const_iterator i = drv.outputs.begin();
return hashString(htSHA256, "fixed:out:"
+ i->second.hashAlgo + ":"
+ i->second.hash + ":"
+ i->second.path);
}
/* For other derivations, replace the inputs paths with recursive
calls to this function.*/
DerivationInputs inputs2;
foreach (DerivationInputs::const_iterator, i, drv.inputDrvs) {
Hash h = drvHashes[i->first];
if (h.type == htUnknown) {
assert(store.isValidPath(i->first));
Derivation drv2 = parseDerivation(readFile(i->first));
h = hashDerivationModulo(store, drv2);
drvHashes[i->first] = h;
}
inputs2[printHash(h)] = i->second;
}
drv.inputDrvs = inputs2;
return hashString(htSHA256, unparseDerivation(drv));
}
DrvPathWithOutputs parseDrvPathWithOutputs(const string & s)
{
size_t n = s.find("!");
return n == s.npos
? DrvPathWithOutputs(s, std::set<string>())
: DrvPathWithOutputs(string(s, 0, n), tokenizeString<std::set<string> >(string(s, n + 1), ","));
}
Path makeDrvPathWithOutputs(const Path & drvPath, const std::set<string> & outputs)
{
return outputs.empty()
? drvPath
: drvPath + "!" + concatStringsSep(",", outputs);
}
bool wantOutput(const string & output, const std::set<string> & wanted)
{
return wanted.empty() || wanted.find(output) != wanted.end();
}
}

93
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#pragma once
#include "types.hh"
#include "hash.hh"
#include <map>
namespace nix {
/* Extension of derivations in the Nix store. */
const string drvExtension = ".drv";
/* Abstract syntax of derivations. */
struct DerivationOutput
{
Path path;
string hashAlgo; /* hash used for expected hash computation */
string hash; /* expected hash, may be null */
DerivationOutput()
{
}
DerivationOutput(Path path, string hashAlgo, string hash)
{
this->path = path;
this->hashAlgo = hashAlgo;
this->hash = hash;
}
void parseHashInfo(bool & recursive, HashType & hashType, Hash & hash) const;
};
typedef std::map<string, DerivationOutput> DerivationOutputs;
/* For inputs that are sub-derivations, we specify exactly which
output IDs we are interested in. */
typedef std::map<Path, StringSet> DerivationInputs;
typedef std::map<string, string> StringPairs;
struct Derivation
{
DerivationOutputs outputs; /* keyed on symbolic IDs */
DerivationInputs inputDrvs; /* inputs that are sub-derivations */
PathSet inputSrcs; /* inputs that are sources */
string platform;
Path builder;
Strings args;
StringPairs env;
};
class StoreAPI;
/* Write a derivation to the Nix store, and return its path. */
Path writeDerivation(StoreAPI & store,
const Derivation & drv, const string & name, bool repair = false);
/* Parse a derivation. */
Derivation parseDerivation(const string & s);
/* Print a derivation. */
string unparseDerivation(const Derivation & drv);
/* Check whether a file name ends with the extensions for
derivations. */
bool isDerivation(const string & fileName);
/* Return true iff this is a fixed-output derivation. */
bool isFixedOutputDrv(const Derivation & drv);
Hash hashDerivationModulo(StoreAPI & store, Derivation drv);
/* Memoisation of hashDerivationModulo(). */
typedef std::map<Path, Hash> DrvHashes;
extern DrvHashes drvHashes;
/* Split a string specifying a derivation and a set of outputs
(/nix/store/hash-foo!out1,out2,...) into the derivation path and
the outputs. */
typedef std::pair<string, std::set<string> > DrvPathWithOutputs;
DrvPathWithOutputs parseDrvPathWithOutputs(const string & s);
Path makeDrvPathWithOutputs(const Path & drvPath, const std::set<string> & outputs);
bool wantOutput(const string & output, const std::set<string> & wanted);
}

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#include "globals.hh"
#include "misc.hh"
#include "local-store.hh"
#include <functional>
#include <queue>
#include <algorithm>
#include <sys/types.h>
#include <sys/stat.h>
#include <errno.h>
#include <fcntl.h>
#include <unistd.h>
namespace nix {
static string gcLockName = "gc.lock";
static string tempRootsDir = "temproots";
static string gcRootsDir = "gcroots";
/* Acquire the global GC lock. This is used to prevent new Nix
processes from starting after the temporary root files have been
read. To be precise: when they try to create a new temporary root
file, they will block until the garbage collector has finished /
yielded the GC lock. */
int LocalStore::openGCLock(LockType lockType)
{
Path fnGCLock = (format("%1%/%2%")
% settings.nixStateDir % gcLockName).str();
debug(format("acquiring global GC lock `%1%'") % fnGCLock);
AutoCloseFD fdGCLock = open(fnGCLock.c_str(), O_RDWR | O_CREAT, 0600);
if (fdGCLock == -1)
throw SysError(format("opening global GC lock `%1%'") % fnGCLock);
closeOnExec(fdGCLock);
if (!lockFile(fdGCLock, lockType, false)) {
printMsg(lvlError, format("waiting for the big garbage collector lock..."));
lockFile(fdGCLock, lockType, true);
}
/* !!! Restrict read permission on the GC root. Otherwise any
process that can open the file for reading can DoS the
collector. */
return fdGCLock.borrow();
}
static void makeSymlink(const Path & link, const Path & target)
{
/* Create directories up to `gcRoot'. */
createDirs(dirOf(link));
/* Create the new symlink. */
Path tempLink = (format("%1%.tmp-%2%-%3%")
% link % getpid() % rand()).str();
createSymlink(target, tempLink);
/* Atomically replace the old one. */
if (rename(tempLink.c_str(), link.c_str()) == -1)
throw SysError(format("cannot rename `%1%' to `%2%'")
% tempLink % link);
}
void LocalStore::syncWithGC()
{
AutoCloseFD fdGCLock = openGCLock(ltRead);
}
void LocalStore::addIndirectRoot(const Path & path)
{
string hash = printHash32(hashString(htSHA1, path));
Path realRoot = canonPath((format("%1%/%2%/auto/%3%")
% settings.nixStateDir % gcRootsDir % hash).str());
makeSymlink(realRoot, path);
}
Path addPermRoot(StoreAPI & store, const Path & _storePath,
const Path & _gcRoot, bool indirect, bool allowOutsideRootsDir)
{
Path storePath(canonPath(_storePath));
Path gcRoot(canonPath(_gcRoot));
assertStorePath(storePath);
if (isInStore(gcRoot))
throw Error(format(
"creating a garbage collector root (%1%) in the Nix store is forbidden "
"(are you running nix-build inside the store?)") % gcRoot);
if (indirect) {
/* Don't clobber the the link if it already exists and doesn't
point to the Nix store. */
if (pathExists(gcRoot) && (!isLink(gcRoot) || !isInStore(readLink(gcRoot))))
throw Error(format("cannot create symlink `%1%'; already exists") % gcRoot);
makeSymlink(gcRoot, storePath);
store.addIndirectRoot(gcRoot);
}
else {
if (!allowOutsideRootsDir) {
Path rootsDir = canonPath((format("%1%/%2%") % settings.nixStateDir % gcRootsDir).str());
if (string(gcRoot, 0, rootsDir.size() + 1) != rootsDir + "/")
throw Error(format(
"path `%1%' is not a valid garbage collector root; "
"it's not in the directory `%2%'")
% gcRoot % rootsDir);
}
makeSymlink(gcRoot, storePath);
}
/* Check that the root can be found by the garbage collector.
!!! This can be very slow on machines that have many roots.
Instead of reading all the roots, it would be more efficient to
check if the root is in a directory in or linked from the
gcroots directory. */
if (settings.checkRootReachability) {
Roots roots = store.findRoots();
if (roots.find(gcRoot) == roots.end())
printMsg(lvlError,
format(
"warning: `%1%' is not in a directory where the garbage collector looks for roots; "
"therefore, `%2%' might be removed by the garbage collector")
% gcRoot % storePath);
}
/* Grab the global GC root, causing us to block while a GC is in
progress. This prevents the set of permanent roots from
increasing while a GC is in progress. */
store.syncWithGC();
return gcRoot;
}
/* The file to which we write our temporary roots. */
static Path fnTempRoots;
static AutoCloseFD fdTempRoots;
void LocalStore::addTempRoot(const Path & path)
{
/* Create the temporary roots file for this process. */
if (fdTempRoots == -1) {
while (1) {
Path dir = (format("%1%/%2%") % settings.nixStateDir % tempRootsDir).str();
createDirs(dir);
fnTempRoots = (format("%1%/%2%")
% dir % getpid()).str();
AutoCloseFD fdGCLock = openGCLock(ltRead);
if (pathExists(fnTempRoots))
/* It *must* be stale, since there can be no two
processes with the same pid. */
unlink(fnTempRoots.c_str());
fdTempRoots = openLockFile(fnTempRoots, true);
fdGCLock.close();
debug(format("acquiring read lock on `%1%'") % fnTempRoots);
lockFile(fdTempRoots, ltRead, true);
/* Check whether the garbage collector didn't get in our
way. */
struct stat st;
if (fstat(fdTempRoots, &st) == -1)
throw SysError(format("statting `%1%'") % fnTempRoots);
if (st.st_size == 0) break;
/* The garbage collector deleted this file before we could
get a lock. (It won't delete the file after we get a
lock.) Try again. */
}
}
/* Upgrade the lock to a write lock. This will cause us to block
if the garbage collector is holding our lock. */
debug(format("acquiring write lock on `%1%'") % fnTempRoots);
lockFile(fdTempRoots, ltWrite, true);
string s = path + '\0';
writeFull(fdTempRoots, (const unsigned char *) s.data(), s.size());
/* Downgrade to a read lock. */
debug(format("downgrading to read lock on `%1%'") % fnTempRoots);
lockFile(fdTempRoots, ltRead, true);
}
void removeTempRoots()
{
if (fdTempRoots != -1) {
fdTempRoots.close();
unlink(fnTempRoots.c_str());
}
}
/* Automatically clean up the temporary roots file when we exit. */
struct RemoveTempRoots
{
~RemoveTempRoots()
{
removeTempRoots();
}
};
static RemoveTempRoots autoRemoveTempRoots __attribute__((unused));
typedef std::shared_ptr<AutoCloseFD> FDPtr;
typedef list<FDPtr> FDs;
static void readTempRoots(PathSet & tempRoots, FDs & fds)
{
/* Read the `temproots' directory for per-process temporary root
files. */
Strings tempRootFiles = readDirectory(
(format("%1%/%2%") % settings.nixStateDir % tempRootsDir).str());
foreach (Strings::iterator, i, tempRootFiles) {
Path path = (format("%1%/%2%/%3%") % settings.nixStateDir % tempRootsDir % *i).str();
debug(format("reading temporary root file `%1%'") % path);
FDPtr fd(new AutoCloseFD(open(path.c_str(), O_RDWR, 0666)));
if (*fd == -1) {
/* It's okay if the file has disappeared. */
if (errno == ENOENT) continue;
throw SysError(format("opening temporary roots file `%1%'") % path);
}
/* This should work, but doesn't, for some reason. */
//FDPtr fd(new AutoCloseFD(openLockFile(path, false)));
//if (*fd == -1) continue;
/* Try to acquire a write lock without blocking. This can
only succeed if the owning process has died. In that case
we don't care about its temporary roots. */
if (lockFile(*fd, ltWrite, false)) {
printMsg(lvlError, format("removing stale temporary roots file `%1%'") % path);
unlink(path.c_str());
writeFull(*fd, (const unsigned char *) "d", 1);
continue;
}
/* Acquire a read lock. This will prevent the owning process
from upgrading to a write lock, therefore it will block in
addTempRoot(). */
debug(format("waiting for read lock on `%1%'") % path);
lockFile(*fd, ltRead, true);
/* Read the entire file. */
string contents = readFile(*fd);
/* Extract the roots. */
string::size_type pos = 0, end;
while ((end = contents.find((char) 0, pos)) != string::npos) {
Path root(contents, pos, end - pos);
debug(format("got temporary root `%1%'") % root);
assertStorePath(root);
tempRoots.insert(root);
pos = end + 1;
}
fds.push_back(fd); /* keep open */
}
}
static void foundRoot(StoreAPI & store,
const Path & path, const Path & target, Roots & roots)
{
Path storePath = toStorePath(target);
if (store.isValidPath(storePath))
roots[path] = storePath;
else
printMsg(lvlInfo, format("skipping invalid root from `%1%' to `%2%'") % path % storePath);
}
static void findRoots(StoreAPI & store, const Path & path, Roots & roots)
{
try {
struct stat st = lstat(path);
if (S_ISDIR(st.st_mode)) {
Strings names = readDirectory(path);
foreach (Strings::iterator, i, names)
findRoots(store, path + "/" + *i, roots);
}
else if (S_ISLNK(st.st_mode)) {
Path target = readLink(path);
if (isInStore(target))
foundRoot(store, path, target, roots);
/* Handle indirect roots. */
else {
target = absPath(target, dirOf(path));
if (!pathExists(target)) {
if (isInDir(path, settings.nixStateDir + "/" + gcRootsDir + "/auto")) {
printMsg(lvlInfo, format("removing stale link from `%1%' to `%2%'") % path % target);
unlink(path.c_str());
}
} else {
struct stat st2 = lstat(target);
if (!S_ISLNK(st2.st_mode)) return;
Path target2 = readLink(target);
if (isInStore(target2)) foundRoot(store, target, target2, roots);
}
}
}
}
catch (SysError & e) {
/* We only ignore permanent failures. */
if (e.errNo == EACCES || e.errNo == ENOENT || e.errNo == ENOTDIR)
printMsg(lvlInfo, format("cannot read potential root `%1%'") % path);
else
throw;
}
}
Roots LocalStore::findRoots()
{
Roots roots;
/* Process direct roots in {gcroots,manifests,profiles}. */
nix::findRoots(*this, settings.nixStateDir + "/" + gcRootsDir, roots);
nix::findRoots(*this, settings.nixStateDir + "/manifests", roots);
nix::findRoots(*this, settings.nixStateDir + "/profiles", roots);
return roots;
}
static void addAdditionalRoots(StoreAPI & store, PathSet & roots)
{
Path rootFinder = getEnv("NIX_ROOT_FINDER",
settings.nixLibexecDir + "/guix/list-runtime-roots");
if (rootFinder.empty()) return;
debug(format("executing `%1%' to find additional roots") % rootFinder);
string result = runProgram(rootFinder);
StringSet paths = tokenizeString<StringSet>(result, "\n");
foreach (StringSet::iterator, i, paths) {
if (isInStore(*i)) {
Path path = toStorePath(*i);
if (roots.find(path) == roots.end() && store.isValidPath(path)) {
debug(format("got additional root `%1%'") % path);
roots.insert(path);
}
}
}
}
struct GCLimitReached { };
struct LocalStore::GCState
{
GCOptions options;
GCResults & results;
PathSet roots;
PathSet tempRoots;
PathSet dead;
PathSet alive;
bool gcKeepOutputs;
bool gcKeepDerivations;
unsigned long long bytesInvalidated;
Path trashDir;
bool shouldDelete;
GCState(GCResults & results_) : results(results_), bytesInvalidated(0) { }
};
bool LocalStore::isActiveTempFile(const GCState & state,
const Path & path, const string & suffix)
{
return hasSuffix(path, suffix)
&& state.tempRoots.find(string(path, 0, path.size() - suffix.size())) != state.tempRoots.end();
}
void LocalStore::deleteGarbage(GCState & state, const Path & path)
{
unsigned long long bytesFreed;
deletePath(path, bytesFreed);
state.results.bytesFreed += bytesFreed;
}
void LocalStore::deletePathRecursive(GCState & state, const Path & path)
{
checkInterrupt();
unsigned long long size = 0;
if (isValidPath(path)) {
PathSet referrers;
queryReferrers(path, referrers);
foreach (PathSet::iterator, i, referrers)
if (*i != path) deletePathRecursive(state, *i);
size = queryPathInfo(path).narSize;
invalidatePathChecked(path);
}
struct stat st;
if (lstat(path.c_str(), &st)) {
if (errno == ENOENT) return;
throw SysError(format("getting status of %1%") % path);
}
printMsg(lvlInfo, format("deleting `%1%'") % path);
state.results.paths.insert(path);
/* If the path is not a regular file or symlink, move it to the
trash directory. The move is to ensure that later (when we're
not holding the global GC lock) we can delete the path without
being afraid that the path has become alive again. Otherwise
delete it right away. */
if (S_ISDIR(st.st_mode)) {
// Estimate the amount freed using the narSize field. FIXME:
// if the path was not valid, need to determine the actual
// size.
state.bytesInvalidated += size;
// Mac OS X cannot rename directories if they are read-only.
if (chmod(path.c_str(), st.st_mode | S_IWUSR) == -1)
throw SysError(format("making `%1%' writable") % path);
Path tmp = state.trashDir + "/" + baseNameOf(path);
if (rename(path.c_str(), tmp.c_str()))
throw SysError(format("unable to rename `%1%' to `%2%'") % path % tmp);
} else
deleteGarbage(state, path);
if (state.results.bytesFreed + state.bytesInvalidated > state.options.maxFreed) {
printMsg(lvlInfo, format("deleted or invalidated more than %1% bytes; stopping") % state.options.maxFreed);
throw GCLimitReached();
}
}
bool LocalStore::canReachRoot(GCState & state, PathSet & visited, const Path & path)
{
if (visited.find(path) != visited.end()) return false;
if (state.alive.find(path) != state.alive.end()) {
return true;
}
if (state.dead.find(path) != state.dead.end()) {
return false;
}
if (state.roots.find(path) != state.roots.end()) {
printMsg(lvlDebug, format("cannot delete `%1%' because it's a root") % path);
state.alive.insert(path);
return true;
}
visited.insert(path);
if (!isValidPath(path)) return false;
PathSet incoming;
/* Don't delete this path if any of its referrers are alive. */
queryReferrers(path, incoming);
/* If gc-keep-derivations is set and this is a derivation, then
don't delete the derivation if any of the outputs are alive. */
if (state.gcKeepDerivations && isDerivation(path)) {
PathSet outputs = queryDerivationOutputs(path);
foreach (PathSet::iterator, i, outputs)
if (isValidPath(*i) && queryDeriver(*i) == path)
incoming.insert(*i);
}
/* If gc-keep-outputs is set, then don't delete this path if there
are derivers of this path that are not garbage. */
if (state.gcKeepOutputs) {
PathSet derivers = queryValidDerivers(path);
foreach (PathSet::iterator, i, derivers)
incoming.insert(*i);
}
foreach (PathSet::iterator, i, incoming)
if (*i != path)
if (canReachRoot(state, visited, *i)) {
state.alive.insert(path);
return true;
}
return false;
}
void LocalStore::tryToDelete(GCState & state, const Path & path)
{
checkInterrupt();
if (path == linksDir || path == state.trashDir) return;
startNest(nest, lvlDebug, format("considering whether to delete `%1%'") % path);
if (!isValidPath(path)) {
/* A lock file belonging to a path that we're building right
now isn't garbage. */
if (isActiveTempFile(state, path, ".lock")) return;
/* Don't delete .chroot directories for derivations that are
currently being built. */
if (isActiveTempFile(state, path, ".chroot")) return;
}
PathSet visited;
if (canReachRoot(state, visited, path)) {
printMsg(lvlDebug, format("cannot delete `%1%' because it's still reachable") % path);
} else {
/* No path we visited was a root, so everything is garbage.
But we only delete ‘path’ and its referrers here so that
‘nix-store --delete’ doesn't have the unexpected effect of
recursing into derivations and outputs. */
state.dead.insert(visited.begin(), visited.end());
if (state.shouldDelete)
deletePathRecursive(state, path);
}
}
/* Unlink all files in /nix/store/.links that have a link count of 1,
which indicates that there are no other links and so they can be
safely deleted. FIXME: race condition with optimisePath(): we
might see a link count of 1 just before optimisePath() increases
the link count. */
void LocalStore::removeUnusedLinks(const GCState & state)
{
AutoCloseDir dir = opendir(linksDir.c_str());
if (!dir) throw SysError(format("opening directory `%1%'") % linksDir);
long long actualSize = 0, unsharedSize = 0;
struct dirent * dirent;
while (errno = 0, dirent = readdir(dir)) {
checkInterrupt();
string name = dirent->d_name;
if (name == "." || name == "..") continue;
Path path = linksDir + "/" + name;
struct stat st;
if (lstat(path.c_str(), &st) == -1)
throw SysError(format("statting `%1%'") % path);
if (st.st_nlink != 1) {
unsigned long long size = st.st_blocks * 512ULL;
actualSize += size;
unsharedSize += (st.st_nlink - 1) * size;
continue;
}
printMsg(lvlTalkative, format("deleting unused link `%1%'") % path);
if (unlink(path.c_str()) == -1)
throw SysError(format("deleting `%1%'") % path);
state.results.bytesFreed += st.st_blocks * 512;
}
struct stat st;
if (stat(linksDir.c_str(), &st) == -1)
throw SysError(format("statting `%1%'") % linksDir);
long long overhead = st.st_blocks * 512ULL;
printMsg(lvlInfo, format("note: currently hard linking saves %.2f MiB")
% ((unsharedSize - actualSize - overhead) / (1024.0 * 1024.0)));
}
void LocalStore::collectGarbage(const GCOptions & options, GCResults & results)
{
GCState state(results);
state.options = options;
state.trashDir = settings.nixStore + "/trash";
state.gcKeepOutputs = settings.gcKeepOutputs;
state.gcKeepDerivations = settings.gcKeepDerivations;
/* Using `--ignore-liveness' with `--delete' can have unintended
consequences if `gc-keep-outputs' or `gc-keep-derivations' are
true (the garbage collector will recurse into deleting the
outputs or derivers, respectively). So disable them. */
if (options.action == GCOptions::gcDeleteSpecific && options.ignoreLiveness) {
state.gcKeepOutputs = false;
state.gcKeepDerivations = false;
}
state.shouldDelete = options.action == GCOptions::gcDeleteDead || options.action == GCOptions::gcDeleteSpecific;
/* Acquire the global GC root. This prevents
a) New roots from being added.
b) Processes from creating new temporary root files. */
AutoCloseFD fdGCLock = openGCLock(ltWrite);
/* Find the roots. Since we've grabbed the GC lock, the set of
permanent roots cannot increase now. */
printMsg(lvlError, format("finding garbage collector roots..."));
Roots rootMap = options.ignoreLiveness ? Roots() : findRoots();
foreach (Roots::iterator, i, rootMap) state.roots.insert(i->second);
/* Add additional roots returned by the program specified by the
NIX_ROOT_FINDER environment variable. This is typically used
to add running programs to the set of roots (to prevent them
from being garbage collected). */
if (!options.ignoreLiveness)
addAdditionalRoots(*this, state.roots);
/* Read the temporary roots. This acquires read locks on all
per-process temporary root files. So after this point no paths
can be added to the set of temporary roots. */
FDs fds;
readTempRoots(state.tempRoots, fds);
state.roots.insert(state.tempRoots.begin(), state.tempRoots.end());
/* After this point the set of roots or temporary roots cannot
increase, since we hold locks on everything. So everything
that is not reachable from `roots'. */
if (state.shouldDelete) {
if (pathExists(state.trashDir)) deleteGarbage(state, state.trashDir);
createDirs(state.trashDir);
}
/* Now either delete all garbage paths, or just the specified
paths (for gcDeleteSpecific). */
if (options.action == GCOptions::gcDeleteSpecific) {
foreach (PathSet::iterator, i, options.pathsToDelete) {
assertStorePath(*i);
tryToDelete(state, *i);
if (state.dead.find(*i) == state.dead.end())
throw Error(format("cannot delete path `%1%' since it is still alive") % *i);
}
} else if (options.maxFreed > 0) {
if (state.shouldDelete)
printMsg(lvlError, format("deleting garbage..."));
else
printMsg(lvlError, format("determining live/dead paths..."));
try {
AutoCloseDir dir = opendir(settings.nixStore.c_str());
if (!dir) throw SysError(format("opening directory `%1%'") % settings.nixStore);
/* Read the store and immediately delete all paths that
aren't valid. When using --max-freed etc., deleting
invalid paths is preferred over deleting unreachable
paths, since unreachable paths could become reachable
again. We don't use readDirectory() here so that GCing
can start faster. */
Paths entries;
struct dirent * dirent;
while (errno = 0, dirent = readdir(dir)) {
checkInterrupt();
string name = dirent->d_name;
if (name == "." || name == "..") continue;
Path path = settings.nixStore + "/" + name;
if (isValidPath(path))
entries.push_back(path);
else
tryToDelete(state, path);
}
dir.close();
/* Now delete the unreachable valid paths. Randomise the
order in which we delete entries to make the collector
less biased towards deleting paths that come
alphabetically first (e.g. /nix/store/000...). This
matters when using --max-freed etc. */
vector<Path> entries_(entries.begin(), entries.end());
random_shuffle(entries_.begin(), entries_.end());
foreach (vector<Path>::iterator, i, entries_)
tryToDelete(state, *i);
} catch (GCLimitReached & e) {
}
}
if (state.options.action == GCOptions::gcReturnLive) {
state.results.paths = state.alive;
return;
}
if (state.options.action == GCOptions::gcReturnDead) {
state.results.paths = state.dead;
return;
}
/* Allow other processes to add to the store from here on. */
fdGCLock.close();
fds.clear();
/* Delete the trash directory. */
printMsg(lvlInfo, format("deleting `%1%'") % state.trashDir);
deleteGarbage(state, state.trashDir);
/* Clean up the links directory. */
if (options.action == GCOptions::gcDeleteDead || options.action == GCOptions::gcDeleteSpecific) {
printMsg(lvlError, format("deleting unused links..."));
removeUnusedLinks(state);
}
/* While we're at it, vacuum the database. */
if (options.action == GCOptions::gcDeleteDead) vacuumDB();
}
}

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#include "config.h"
#include "globals.hh"
#include "util.hh"
#include <map>
#include <algorithm>
namespace nix {
/* The default location of the daemon socket, relative to nixStateDir.
The socket is in a directory to allow you to control access to the
Nix daemon by setting the mode/ownership of the directory
appropriately. (This wouldn't work on the socket itself since it
must be deleted and recreated on startup.) */
#define DEFAULT_SOCKET_PATH "/daemon-socket/socket"
Settings settings;
Settings::Settings()
{
keepFailed = false;
keepGoing = false;
tryFallback = false;
buildVerbosity = lvlError;
maxBuildJobs = 1;
buildCores = 1;
readOnlyMode = false;
thisSystem = SYSTEM;
maxSilentTime = 0;
buildTimeout = 0;
useBuildHook = true;
printBuildTrace = false;
reservedSize = 1024 * 1024;
fsyncMetadata = true;
useSQLiteWAL = true;
syncBeforeRegistering = false;
useSubstitutes = true;
useChroot = false;
useSshSubstituter = false;
impersonateLinux26 = false;
keepLog = true;
compressLog = true;
maxLogSize = 0;
cacheFailure = false;
pollInterval = 5;
checkRootReachability = false;
gcKeepOutputs = false;
gcKeepDerivations = true;
autoOptimiseStore = false;
envKeepDerivations = false;
lockCPU = getEnv("NIX_AFFINITY_HACK", "1") == "1";
showTrace = false;
}
void Settings::processEnvironment()
{
nixStore = canonPath(getEnv("NIX_STORE_DIR", getEnv("NIX_STORE", NIX_STORE_DIR)));
nixDataDir = canonPath(getEnv("NIX_DATA_DIR", NIX_DATA_DIR));
nixLogDir = canonPath(getEnv("NIX_LOG_DIR", NIX_LOG_DIR));
nixStateDir = canonPath(getEnv("NIX_STATE_DIR", NIX_STATE_DIR));
nixDBPath = getEnv("NIX_DB_DIR", nixStateDir + "/db");
nixConfDir = canonPath(getEnv("NIX_CONF_DIR", NIX_CONF_DIR));
nixLibexecDir = canonPath(getEnv("NIX_LIBEXEC_DIR", NIX_LIBEXEC_DIR));
nixBinDir = canonPath(getEnv("NIX_BIN_DIR", NIX_BIN_DIR));
nixDaemonSocketFile = canonPath(nixStateDir + DEFAULT_SOCKET_PATH);
}
void Settings::loadConfFile()
{
Path settingsFile = (format("%1%/%2%") % nixConfDir % "nix.conf").str();
if (!pathExists(settingsFile)) return;
string contents = readFile(settingsFile);
unsigned int pos = 0;
while (pos < contents.size()) {
string line;
while (pos < contents.size() && contents[pos] != '\n')
line += contents[pos++];
pos++;
string::size_type hash = line.find('#');
if (hash != string::npos)
line = string(line, 0, hash);
vector<string> tokens = tokenizeString<vector<string> >(line);
if (tokens.empty()) continue;
if (tokens.size() < 2 || tokens[1] != "=")
throw Error(format("illegal configuration line `%1%' in `%2%'") % line % settingsFile);
string name = tokens[0];
vector<string>::iterator i = tokens.begin();
advance(i, 2);
settings[name] = concatStringsSep(" ", Strings(i, tokens.end())); // FIXME: slow
};
}
void Settings::set(const string & name, const string & value)
{
settings[name] = value;
overrides[name] = value;
}
void Settings::update()
{
get(tryFallback, "build-fallback");
get(maxBuildJobs, "build-max-jobs");
get(buildCores, "build-cores");
get(thisSystem, "system");
get(maxSilentTime, "build-max-silent-time");
get(buildTimeout, "build-timeout");
get(reservedSize, "gc-reserved-space");
get(fsyncMetadata, "fsync-metadata");
get(useSQLiteWAL, "use-sqlite-wal");
get(syncBeforeRegistering, "sync-before-registering");
get(useSubstitutes, "build-use-substitutes");
get(buildUsersGroup, "build-users-group");
get(useChroot, "build-use-chroot");
get(dirsInChroot, "build-chroot-dirs");
get(impersonateLinux26, "build-impersonate-linux-26");
get(keepLog, "build-keep-log");
get(compressLog, "build-compress-log");
get(maxLogSize, "build-max-log-size");
get(cacheFailure, "build-cache-failure");
get(pollInterval, "build-poll-interval");
get(checkRootReachability, "gc-check-reachability");
get(gcKeepOutputs, "gc-keep-outputs");
get(gcKeepDerivations, "gc-keep-derivations");
get(autoOptimiseStore, "auto-optimise-store");
get(envKeepDerivations, "env-keep-derivations");
get(sshSubstituterHosts, "ssh-substituter-hosts");
get(useSshSubstituter, "use-ssh-substituter");
string subs = getEnv("NIX_SUBSTITUTERS", "default");
if (subs == "default") {
substituters.clear();
#if 0
if (getEnv("NIX_OTHER_STORES") != "")
substituters.push_back(nixLibexecDir + "/nix/substituters/copy-from-other-stores.pl");
#endif
substituters.push_back(nixLibexecDir + "/nix/substituters/download-using-manifests.pl");
substituters.push_back(nixLibexecDir + "/nix/substituters/download-from-binary-cache.pl");
if (useSshSubstituter)
substituters.push_back(nixLibexecDir + "/nix/substituters/download-via-ssh");
} else
substituters = tokenizeString<Strings>(subs, ":");
}
void Settings::get(string & res, const string & name)
{
SettingsMap::iterator i = settings.find(name);
if (i == settings.end()) return;
res = i->second;
}
void Settings::get(bool & res, const string & name)
{
SettingsMap::iterator i = settings.find(name);
if (i == settings.end()) return;
if (i->second == "true") res = true;
else if (i->second == "false") res = false;
else throw Error(format("configuration option `%1%' should be either `true' or `false', not `%2%'")
% name % i->second);
}
void Settings::get(StringSet & res, const string & name)
{
SettingsMap::iterator i = settings.find(name);
if (i == settings.end()) return;
res.clear();
Strings ss = tokenizeString<Strings>(i->second);
res.insert(ss.begin(), ss.end());
}
void Settings::get(Strings & res, const string & name)
{
SettingsMap::iterator i = settings.find(name);
if (i == settings.end()) return;
res = tokenizeString<Strings>(i->second);
}
template<class N> void Settings::get(N & res, const string & name)
{
SettingsMap::iterator i = settings.find(name);
if (i == settings.end()) return;
if (!string2Int(i->second, res))
throw Error(format("configuration setting `%1%' should have an integer value") % name);
}
string Settings::pack()
{
string s;
foreach (SettingsMap::iterator, i, settings) {
if (i->first.find('\n') != string::npos ||
i->first.find('=') != string::npos ||
i->second.find('\n') != string::npos)
throw Error("illegal option name/value");
s += i->first; s += '='; s += i->second; s += '\n';
}
return s;
}
void Settings::unpack(const string & pack) {
Strings lines = tokenizeString<Strings>(pack, "\n");
foreach (Strings::iterator, i, lines) {
string::size_type eq = i->find('=');
if (eq == string::npos)
throw Error("illegal option name/value");
set(i->substr(0, eq), i->substr(eq + 1));
}
}
Settings::SettingsMap Settings::getOverrides()
{
return overrides;
}
const string nixVersion = PACKAGE_VERSION;
}

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#pragma once
#include "types.hh"
#include <map>
#include <sys/types.h>
namespace nix {
struct Settings {
typedef std::map<string, string> SettingsMap;
Settings();
void processEnvironment();
void loadConfFile();
void set(const string & name, const string & value);
void update();
string pack();
void unpack(const string & pack);
SettingsMap getOverrides();
/* The directory where we store sources and derived files. */
Path nixStore;
Path nixDataDir; /* !!! fix */
/* The directory where we log various operations. */
Path nixLogDir;
/* The directory where state is stored. */
Path nixStateDir;
/* The directory where we keep the SQLite database. */
Path nixDBPath;
/* The directory where configuration files are stored. */
Path nixConfDir;
/* The directory where internal helper programs are stored. */
Path nixLibexecDir;
/* The directory where the main programs are stored. */
Path nixBinDir;
/* File name of the socket the daemon listens to. */
Path nixDaemonSocketFile;
/* Whether to keep temporary directories of failed builds. */
bool keepFailed;
/* Whether to keep building subgoals when a sibling (another
subgoal of the same goal) fails. */
bool keepGoing;
/* Whether, if we cannot realise the known closure corresponding
to a derivation, we should try to normalise the derivation
instead. */
bool tryFallback;
/* Verbosity level for build output. */
Verbosity buildVerbosity;
/* Maximum number of parallel build jobs. 0 means unlimited. */
unsigned int maxBuildJobs;
/* Number of CPU cores to utilize in parallel within a build,
i.e. by passing this number to Make via '-j'. 0 means that the
number of actual CPU cores on the local host ought to be
auto-detected. */
unsigned int buildCores;
/* Read-only mode. Don't copy stuff to the store, don't change
the database. */
bool readOnlyMode;
/* The canonical system name, as returned by config.guess. */
string thisSystem;
/* The maximum time in seconds that a builer can go without
producing any output on stdout/stderr before it is killed. 0
means infinity. */
time_t maxSilentTime;
/* The maximum duration in seconds that a builder can run. 0
means infinity. */
time_t buildTimeout;
/* The substituters. There are programs that can somehow realise
a store path without building, e.g., by downloading it or
copying it from a CD. */
Paths substituters;
/* Whether to use build hooks (for distributed builds). Sometimes
users want to disable this from the command-line. */
bool useBuildHook;
/* Whether buildDerivations() should print out lines on stderr in
a fixed format to allow its progress to be monitored. Each
line starts with a "@". The following are defined:
@ build-started <drvpath> <outpath> <system> <logfile>
@ build-failed <drvpath> <outpath> <exitcode> <error text>
@ build-succeeded <drvpath> <outpath>
@ substituter-started <outpath> <substituter>
@ substituter-failed <outpath> <exitcode> <error text>
@ substituter-succeeded <outpath>
Best combined with --no-build-output, otherwise stderr might
conceivably contain lines in this format printed by the
builders. */
bool printBuildTrace;
/* Amount of reserved space for the garbage collector
(/nix/var/nix/db/reserved). */
off_t reservedSize;
/* Whether SQLite should use fsync. */
bool fsyncMetadata;
/* Whether SQLite should use WAL mode. */
bool useSQLiteWAL;
/* Whether to call sync() before registering a path as valid. */
bool syncBeforeRegistering;
/* Whether to use substitutes. */
bool useSubstitutes;
/* The Unix group that contains the build users. */
string buildUsersGroup;
/* Whether to build in chroot. */
bool useChroot;
/* The directories from the host filesystem to be included in the
chroot. */
StringSet dirsInChroot;
/* Set of ssh connection strings for the ssh substituter */
Strings sshSubstituterHosts;
/* Whether to use the ssh substituter at all */
bool useSshSubstituter;
/* Whether to impersonate a Linux 2.6 machine on newer kernels. */
bool impersonateLinux26;
/* Whether to store build logs. */
bool keepLog;
/* Whether to compress logs. */
bool compressLog;
/* Maximum number of bytes a builder can write to stdout/stderr
before being killed (0 means no limit). */
unsigned long maxLogSize;
/* Whether to cache build failures. */
bool cacheFailure;
/* How often (in seconds) to poll for locks. */
unsigned int pollInterval;
/* Whether to check if new GC roots can in fact be found by the
garbage collector. */
bool checkRootReachability;
/* Whether the garbage collector should keep outputs of live
derivations. */
bool gcKeepOutputs;
/* Whether the garbage collector should keep derivers of live
paths. */
bool gcKeepDerivations;
/* Whether to automatically replace files with identical contents
with hard links. */
bool autoOptimiseStore;
/* Whether to add derivations as a dependency of user environments
(to prevent them from being GCed). */
bool envKeepDerivations;
/* Whether to lock the Nix client and worker to the same CPU. */
bool lockCPU;
/* Whether to show a stack trace if Nix evaluation fails. */
bool showTrace;
private:
SettingsMap settings, overrides;
void get(string & res, const string & name);
void get(bool & res, const string & name);
void get(StringSet & res, const string & name);
void get(Strings & res, const string & name);
template<class N> void get(N & res, const string & name);
};
// FIXME: don't use a global variable.
extern Settings settings;
extern const string nixVersion;
}

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#pragma once
#include <string>
#include "store-api.hh"
#include "util.hh"
#include "pathlocks.hh"
class sqlite3;
class sqlite3_stmt;
namespace nix {
/* Nix store and database schema version. Version 1 (or 0) was Nix <=
0.7. Version 2 was Nix 0.8 and 0.9. Version 3 is Nix 0.10.
Version 4 is Nix 0.11. Version 5 is Nix 0.12-0.16. Version 6 is
Nix 1.0. Version 7 is Nix 1.3. */
const int nixSchemaVersion = 7;
extern string drvsLogDir;
struct Derivation;
struct OptimiseStats
{
unsigned long totalFiles;
unsigned long sameContents;
unsigned long filesLinked;
unsigned long long bytesFreed;
unsigned long long blocksFreed;
OptimiseStats()
{
totalFiles = sameContents = filesLinked = 0;
bytesFreed = blocksFreed = 0;
}
};
struct RunningSubstituter
{
Path program;
Pid pid;
AutoCloseFD to, from, error;
FdSource fromBuf;
bool disabled;
RunningSubstituter() : disabled(false) { };
};
/* Wrapper object to close the SQLite database automatically. */
struct SQLite
{
sqlite3 * db;
SQLite() { db = 0; }
~SQLite();
operator sqlite3 * () { return db; }
};
/* Wrapper object to create and destroy SQLite prepared statements. */
struct SQLiteStmt
{
sqlite3 * db;
sqlite3_stmt * stmt;
unsigned int curArg;
SQLiteStmt() { stmt = 0; }
void create(sqlite3 * db, const string & s);
void reset();
~SQLiteStmt();
operator sqlite3_stmt * () { return stmt; }
void bind(const string & value);
void bind(int value);
void bind64(long long value);
void bind();
};
class LocalStore : public StoreAPI
{
private:
typedef std::map<Path, RunningSubstituter> RunningSubstituters;
RunningSubstituters runningSubstituters;
Path linksDir;
public:
/* Initialise the local store, upgrading the schema if
necessary. */
LocalStore(bool reserveSpace = true);
~LocalStore();
/* Implementations of abstract store API methods. */
bool isValidPath(const Path & path);
PathSet queryValidPaths(const PathSet & paths);
PathSet queryAllValidPaths();
ValidPathInfo queryPathInfo(const Path & path);
Hash queryPathHash(const Path & path);
void queryReferences(const Path & path, PathSet & references);
void queryReferrers(const Path & path, PathSet & referrers);
Path queryDeriver(const Path & path);
PathSet queryValidDerivers(const Path & path);
PathSet queryDerivationOutputs(const Path & path);
StringSet queryDerivationOutputNames(const Path & path);
Path queryPathFromHashPart(const string & hashPart);
PathSet querySubstitutablePaths(const PathSet & paths);
void querySubstitutablePathInfos(const Path & substituter,
PathSet & paths, SubstitutablePathInfos & infos);
void querySubstitutablePathInfos(const PathSet & paths,
SubstitutablePathInfos & infos);
Path addToStore(const Path & srcPath,
bool recursive = true, HashType hashAlgo = htSHA256,
PathFilter & filter = defaultPathFilter, bool repair = false);
/* Like addToStore(), but the contents of the path are contained
in `dump', which is either a NAR serialisation (if recursive ==
true) or simply the contents of a regular file (if recursive ==
false). */
Path addToStoreFromDump(const string & dump, const string & name,
bool recursive = true, HashType hashAlgo = htSHA256, bool repair = false);
Path addTextToStore(const string & name, const string & s,
const PathSet & references, bool repair = false);
void exportPath(const Path & path, bool sign,
Sink & sink);
Paths importPaths(bool requireSignature, Source & source);
void buildPaths(const PathSet & paths, BuildMode buildMode);
void ensurePath(const Path & path);
void addTempRoot(const Path & path);
void addIndirectRoot(const Path & path);
void syncWithGC();
Roots findRoots();
void collectGarbage(const GCOptions & options, GCResults & results);
/* Optimise the disk space usage of the Nix store by hard-linking
files with the same contents. */
void optimiseStore(OptimiseStats & stats);
/* Optimise a single store path. */
void optimisePath(const Path & path);
/* Check the integrity of the Nix store. Returns true if errors
remain. */
bool verifyStore(bool checkContents, bool repair);
/* Register the validity of a path, i.e., that `path' exists, that
the paths referenced by it exists, and in the case of an output
path of a derivation, that it has been produced by a successful
execution of the derivation (or something equivalent). Also
register the hash of the file system contents of the path. The
hash must be a SHA-256 hash. */
void registerValidPath(const ValidPathInfo & info);
void registerValidPaths(const ValidPathInfos & infos);
/* Register that the build of a derivation with output `path' has
failed. */
void registerFailedPath(const Path & path);
/* Query whether `path' previously failed to build. */
bool hasPathFailed(const Path & path);
PathSet queryFailedPaths();
void clearFailedPaths(const PathSet & paths);
void vacuumDB();
/* Repair the contents of the given path by redownloading it using
a substituter (if available). */
void repairPath(const Path & path);
/* Check whether the given valid path exists and has the right
contents. */
bool pathContentsGood(const Path & path);
void markContentsGood(const Path & path);
void setSubstituterEnv();
private:
Path schemaPath;
/* Lock file used for upgrading. */
AutoCloseFD globalLock;
/* The SQLite database object. */
SQLite db;
/* Some precompiled SQLite statements. */
SQLiteStmt stmtRegisterValidPath;
SQLiteStmt stmtUpdatePathInfo;
SQLiteStmt stmtAddReference;
SQLiteStmt stmtQueryPathInfo;
SQLiteStmt stmtQueryReferences;
SQLiteStmt stmtQueryReferrers;
SQLiteStmt stmtInvalidatePath;
SQLiteStmt stmtRegisterFailedPath;
SQLiteStmt stmtHasPathFailed;
SQLiteStmt stmtQueryFailedPaths;
SQLiteStmt stmtClearFailedPath;
SQLiteStmt stmtAddDerivationOutput;
SQLiteStmt stmtQueryValidDerivers;
SQLiteStmt stmtQueryDerivationOutputs;
SQLiteStmt stmtQueryPathFromHashPart;
/* Cache for pathContentsGood(). */
std::map<Path, bool> pathContentsGoodCache;
bool didSetSubstituterEnv;
int getSchema();
void openDB(bool create);
void makeStoreWritable();
unsigned long long queryValidPathId(const Path & path);
unsigned long long addValidPath(const ValidPathInfo & info, bool checkOutputs = true);
void addReference(unsigned long long referrer, unsigned long long reference);
void appendReferrer(const Path & from, const Path & to, bool lock);
void rewriteReferrers(const Path & path, bool purge, PathSet referrers);
void invalidatePath(const Path & path);
/* Delete a path from the Nix store. */
void invalidatePathChecked(const Path & path);
void verifyPath(const Path & path, const PathSet & store,
PathSet & done, PathSet & validPaths, bool repair, bool & errors);
void updatePathInfo(const ValidPathInfo & info);
void upgradeStore6();
void upgradeStore7();
PathSet queryValidPathsOld();
ValidPathInfo queryPathInfoOld(const Path & path);
struct GCState;
void deleteGarbage(GCState & state, const Path & path);
void tryToDelete(GCState & state, const Path & path);
bool canReachRoot(GCState & state, PathSet & visited, const Path & path);
void deletePathRecursive(GCState & state, const Path & path);
bool isActiveTempFile(const GCState & state,
const Path & path, const string & suffix);
int openGCLock(LockType lockType);
void removeUnusedLinks(const GCState & state);
void startSubstituter(const Path & substituter,
RunningSubstituter & runningSubstituter);
string getLineFromSubstituter(RunningSubstituter & run);
template<class T> T getIntLineFromSubstituter(RunningSubstituter & run);
Path createTempDirInStore();
Path importPath(bool requireSignature, Source & source);
void checkDerivationOutputs(const Path & drvPath, const Derivation & drv);
void optimisePath_(OptimiseStats & stats, const Path & path);
// Internal versions that are not wrapped in retry_sqlite.
bool isValidPath_(const Path & path);
void queryReferrers_(const Path & path, PathSet & referrers);
};
typedef std::pair<dev_t, ino_t> Inode;
typedef set<Inode> InodesSeen;
/* "Fix", or canonicalise, the meta-data of the files in a store path
after it has been built. In particular:
- the last modification date on each file is set to 1 (i.e.,
00:00:01 1/1/1970 UTC)
- the permissions are set of 444 or 555 (i.e., read-only with or
without execute permission; setuid bits etc. are cleared)
- the owner and group are set to the Nix user and group, if we're
running as root. */
void canonicalisePathMetaData(const Path & path, uid_t fromUid, InodesSeen & inodesSeen);
void canonicalisePathMetaData(const Path & path, uid_t fromUid);
void canonicaliseTimestampAndPermissions(const Path & path);
MakeError(PathInUse, Error);
}

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#include "misc.hh"
#include "store-api.hh"
#include "local-store.hh"
#include "globals.hh"
namespace nix {
Derivation derivationFromPath(StoreAPI & store, const Path & drvPath)
{
assertStorePath(drvPath);
store.ensurePath(drvPath);
return parseDerivation(readFile(drvPath));
}
void computeFSClosure(StoreAPI & store, const Path & path,
PathSet & paths, bool flipDirection, bool includeOutputs, bool includeDerivers)
{
if (paths.find(path) != paths.end()) return;
paths.insert(path);
PathSet edges;
if (flipDirection) {
store.queryReferrers(path, edges);
if (includeOutputs) {
PathSet derivers = store.queryValidDerivers(path);
foreach (PathSet::iterator, i, derivers)
edges.insert(*i);
}
if (includeDerivers && isDerivation(path)) {
PathSet outputs = store.queryDerivationOutputs(path);
foreach (PathSet::iterator, i, outputs)
if (store.isValidPath(*i) && store.queryDeriver(*i) == path)
edges.insert(*i);
}
} else {
store.queryReferences(path, edges);
if (includeOutputs && isDerivation(path)) {
PathSet outputs = store.queryDerivationOutputs(path);
foreach (PathSet::iterator, i, outputs)
if (store.isValidPath(*i)) edges.insert(*i);
}
if (includeDerivers) {
Path deriver = store.queryDeriver(path);
if (store.isValidPath(deriver)) edges.insert(deriver);
}
}
foreach (PathSet::iterator, i, edges)
computeFSClosure(store, *i, paths, flipDirection, includeOutputs, includeDerivers);
}
Path findOutput(const Derivation & drv, string id)
{
foreach (DerivationOutputs::const_iterator, i, drv.outputs)
if (i->first == id) return i->second.path;
throw Error(format("derivation has no output `%1%'") % id);
}
void queryMissing(StoreAPI & store, const PathSet & targets,
PathSet & willBuild, PathSet & willSubstitute, PathSet & unknown,
unsigned long long & downloadSize, unsigned long long & narSize)
{
downloadSize = narSize = 0;
PathSet todo(targets.begin(), targets.end()), done;
/* Getting substitute info has high latency when using the binary
cache substituter. Thus it's essential to do substitute
queries in parallel as much as possible. To accomplish this
we do the following:
- For all paths still to be processed (‘todo’), we add all
paths for which we need info to the set ‘query’. For an
unbuilt derivation this is the output paths; otherwise, it's
the path itself.
- We get info about all paths in ‘query’ in parallel.
- We process the results and add new items to ‘todo’ if
necessary. E.g. if a path is substitutable, then we need to
get info on its references.
- Repeat until ‘todo’ is empty.
*/
while (!todo.empty()) {
PathSet query, todoDrv, todoNonDrv;
foreach (PathSet::iterator, i, todo) {
if (done.find(*i) != done.end()) continue;
done.insert(*i);
DrvPathWithOutputs i2 = parseDrvPathWithOutputs(*i);
if (isDerivation(i2.first)) {
if (!store.isValidPath(i2.first)) {
// FIXME: we could try to substitute p.
unknown.insert(*i);
continue;
}
Derivation drv = derivationFromPath(store, i2.first);
PathSet invalid;
foreach (DerivationOutputs::iterator, j, drv.outputs)
if (wantOutput(j->first, i2.second)
&& !store.isValidPath(j->second.path))
invalid.insert(j->second.path);
if (invalid.empty()) continue;
todoDrv.insert(*i);
if (settings.useSubstitutes && !willBuildLocally(drv))
query.insert(invalid.begin(), invalid.end());
}
else {
if (store.isValidPath(*i)) continue;
query.insert(*i);
todoNonDrv.insert(*i);
}
}
todo.clear();
SubstitutablePathInfos infos;
store.querySubstitutablePathInfos(query, infos);
foreach (PathSet::iterator, i, todoDrv) {
DrvPathWithOutputs i2 = parseDrvPathWithOutputs(*i);
// FIXME: cache this
Derivation drv = derivationFromPath(store, i2.first);
PathSet outputs;
bool mustBuild = false;
if (settings.useSubstitutes && !willBuildLocally(drv)) {
foreach (DerivationOutputs::iterator, j, drv.outputs) {
if (!wantOutput(j->first, i2.second)) continue;
if (!store.isValidPath(j->second.path)) {
if (infos.find(j->second.path) == infos.end())
mustBuild = true;
else
outputs.insert(j->second.path);
}
}
} else
mustBuild = true;
if (mustBuild) {
willBuild.insert(i2.first);
todo.insert(drv.inputSrcs.begin(), drv.inputSrcs.end());
foreach (DerivationInputs::iterator, j, drv.inputDrvs)
todo.insert(makeDrvPathWithOutputs(j->first, j->second));
} else
todoNonDrv.insert(outputs.begin(), outputs.end());
}
foreach (PathSet::iterator, i, todoNonDrv) {
done.insert(*i);
SubstitutablePathInfos::iterator info = infos.find(*i);
if (info != infos.end()) {
willSubstitute.insert(*i);
downloadSize += info->second.downloadSize;
narSize += info->second.narSize;
todo.insert(info->second.references.begin(), info->second.references.end());
} else
unknown.insert(*i);
}
}
}
static void dfsVisit(StoreAPI & store, const PathSet & paths,
const Path & path, PathSet & visited, Paths & sorted,
PathSet & parents)
{
if (parents.find(path) != parents.end())
throw BuildError(format("cycle detected in the references of `%1%'") % path);
if (visited.find(path) != visited.end()) return;
visited.insert(path);
parents.insert(path);
PathSet references;
if (store.isValidPath(path))
store.queryReferences(path, references);
foreach (PathSet::iterator, i, references)
/* Don't traverse into paths that don't exist. That can
happen due to substitutes for non-existent paths. */
if (*i != path && paths.find(*i) != paths.end())
dfsVisit(store, paths, *i, visited, sorted, parents);
sorted.push_front(path);
parents.erase(path);
}
Paths topoSortPaths(StoreAPI & store, const PathSet & paths)
{
Paths sorted;
PathSet visited, parents;
foreach (PathSet::const_iterator, i, paths)
dfsVisit(store, paths, *i, visited, sorted, parents);
return sorted;
}
}

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#pragma once
#include "derivations.hh"
namespace nix {
/* Read a derivation, after ensuring its existence through
ensurePath(). */
Derivation derivationFromPath(StoreAPI & store, const Path & drvPath);
/* Place in `paths' the set of all store paths in the file system
closure of `storePath'; that is, all paths than can be directly or
indirectly reached from it. `paths' is not cleared. If
`flipDirection' is true, the set of paths that can reach
`storePath' is returned; that is, the closures under the
`referrers' relation instead of the `references' relation is
returned. */
void computeFSClosure(StoreAPI & store, const Path & path,
PathSet & paths, bool flipDirection = false,
bool includeOutputs = false, bool includeDerivers = false);
/* Return the path corresponding to the output identifier `id' in the
given derivation. */
Path findOutput(const Derivation & drv, string id);
/* Given a set of paths that are to be built, return the set of
derivations that will be built, and the set of output paths that
will be substituted. */
void queryMissing(StoreAPI & store, const PathSet & targets,
PathSet & willBuild, PathSet & willSubstitute, PathSet & unknown,
unsigned long long & downloadSize, unsigned long long & narSize);
bool willBuildLocally(const Derivation & drv);
}

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#include "config.h"
#include "util.hh"
#include "local-store.hh"
#include "globals.hh"
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <errno.h>
#include <stdio.h>
namespace nix {
static void makeWritable(const Path & path)
{
struct stat st;
if (lstat(path.c_str(), &st))
throw SysError(format("getting attributes of path `%1%'") % path);
if (chmod(path.c_str(), st.st_mode | S_IWUSR) == -1)
throw SysError(format("changing writability of `%1%'") % path);
}
struct MakeReadOnly
{
Path path;
MakeReadOnly(const Path & path) : path(path) { }
~MakeReadOnly()
{
try {
/* This will make the path read-only. */
if (path != "") canonicaliseTimestampAndPermissions(path);
} catch (...) {
ignoreException();
}
}
};
void LocalStore::optimisePath_(OptimiseStats & stats, const Path & path)
{
checkInterrupt();
struct stat st;
if (lstat(path.c_str(), &st))
throw SysError(format("getting attributes of path `%1%'") % path);
if (S_ISDIR(st.st_mode)) {
Strings names = readDirectory(path);
foreach (Strings::iterator, i, names)
optimisePath_(stats, path + "/" + *i);
return;
}
/* We can hard link regular files and maybe symlinks. */
if (!S_ISREG(st.st_mode)
#if CAN_LINK_SYMLINK
&& !S_ISLNK(st.st_mode)
#endif
) return;
/* Sometimes SNAFUs can cause files in the Nix store to be
modified, in particular when running programs as root under
NixOS (example: $fontconfig/var/cache being modified). Skip
those files. FIXME: check the modification time. */
if (S_ISREG(st.st_mode) && (st.st_mode & S_IWUSR)) {
printMsg(lvlError, format("skipping suspicious writable file `%1%'") % path);
return;
}
/* Hash the file. Note that hashPath() returns the hash over the
NAR serialisation, which includes the execute bit on the file.
Thus, executable and non-executable files with the same
contents *won't* be linked (which is good because otherwise the
permissions would be screwed up).
Also note that if `path' is a symlink, then we're hashing the
contents of the symlink (i.e. the result of readlink()), not
the contents of the target (which may not even exist). */
Hash hash = hashPath(htSHA256, path).first;
stats.totalFiles++;
printMsg(lvlDebug, format("`%1%' has hash `%2%'") % path % printHash(hash));
/* Check if this is a known hash. */
Path linkPath = linksDir + "/" + printHash32(hash);
if (!pathExists(linkPath)) {
/* Nope, create a hard link in the links directory. */
if (link(path.c_str(), linkPath.c_str()) == 0) return;
if (errno != EEXIST)
throw SysError(format("cannot link `%1%' to `%2%'") % linkPath % path);
/* Fall through if another process created ‘linkPath’ before
we did. */
}
/* Yes! We've seen a file with the same contents. Replace the
current file with a hard link to that file. */
struct stat stLink;
if (lstat(linkPath.c_str(), &stLink))
throw SysError(format("getting attributes of path `%1%'") % linkPath);
stats.sameContents++;
if (st.st_ino == stLink.st_ino) {
printMsg(lvlDebug, format("`%1%' is already linked to `%2%'") % path % linkPath);
return;
}
printMsg(lvlTalkative, format("linking `%1%' to `%2%'") % path % linkPath);
/* Make the containing directory writable, but only if it's not
the store itself (we don't want or need to mess with its
permissions). */
bool mustToggle = !isStorePath(path);
if (mustToggle) makeWritable(dirOf(path));
/* When we're done, make the directory read-only again and reset
its timestamp back to 0. */
MakeReadOnly makeReadOnly(mustToggle ? dirOf(path) : "");
Path tempLink = (format("%1%/.tmp-link-%2%-%3%")
% settings.nixStore % getpid() % rand()).str();
if (link(linkPath.c_str(), tempLink.c_str()) == -1) {
if (errno == EMLINK) {
/* Too many links to the same file (>= 32000 on most file
systems). This is likely to happen with empty files.
Just shrug and ignore. */
if (st.st_size)
printMsg(lvlInfo, format("`%1%' has maximum number of links") % linkPath);
return;
}
throw SysError(format("cannot link `%1%' to `%2%'") % tempLink % linkPath);
}
/* Atomically replace the old file with the new hard link. */
if (rename(tempLink.c_str(), path.c_str()) == -1) {
if (unlink(tempLink.c_str()) == -1)
printMsg(lvlError, format("unable to unlink `%1%'") % tempLink);
if (errno == EMLINK) {
/* Some filesystems generate too many links on the rename,
rather than on the original link. (Probably it
temporarily increases the st_nlink field before
decreasing it again.) */
if (st.st_size)
printMsg(lvlInfo, format("`%1%' has maximum number of links") % linkPath);
return;
}
throw SysError(format("cannot rename `%1%' to `%2%'") % tempLink % path);
}
stats.filesLinked++;
stats.bytesFreed += st.st_size;
stats.blocksFreed += st.st_blocks;
}
void LocalStore::optimiseStore(OptimiseStats & stats)
{
PathSet paths = queryAllValidPaths();
foreach (PathSet::iterator, i, paths) {
addTempRoot(*i);
if (!isValidPath(*i)) continue; /* path was GC'ed, probably */
startNest(nest, lvlChatty, format("hashing files in `%1%'") % *i);
optimisePath_(stats, *i);
}
}
void LocalStore::optimisePath(const Path & path)
{
OptimiseStats stats;
if (settings.autoOptimiseStore) optimisePath_(stats, path);
}
}

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#include "pathlocks.hh"
#include "util.hh"
#include <cerrno>
#include <cstdlib>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
namespace nix {
int openLockFile(const Path & path, bool create)
{
AutoCloseFD fd;
fd = open(path.c_str(), O_RDWR | (create ? O_CREAT : 0), 0600);
if (fd == -1 && (create || errno != ENOENT))
throw SysError(format("opening lock file `%1%'") % path);
closeOnExec(fd);
return fd.borrow();
}
void deleteLockFile(const Path & path, int fd)
{
/* Get rid of the lock file. Have to be careful not to introduce
races. Write a (meaningless) token to the file to indicate to
other processes waiting on this lock that the lock is stale
(deleted). */
unlink(path.c_str());
writeFull(fd, (const unsigned char *) "d", 1);
/* Note that the result of unlink() is ignored; removing the lock
file is an optimisation, not a necessity. */
}
bool lockFile(int fd, LockType lockType, bool wait)
{
struct flock lock;
if (lockType == ltRead) lock.l_type = F_RDLCK;
else if (lockType == ltWrite) lock.l_type = F_WRLCK;
else if (lockType == ltNone) lock.l_type = F_UNLCK;
else abort();
lock.l_whence = SEEK_SET;
lock.l_start = 0;
lock.l_len = 0; /* entire file */
if (wait) {
while (fcntl(fd, F_SETLKW, &lock) != 0) {
checkInterrupt();
if (errno != EINTR)
throw SysError(format("acquiring/releasing lock"));
}
} else {
while (fcntl(fd, F_SETLK, &lock) != 0) {
checkInterrupt();
if (errno == EACCES || errno == EAGAIN) return false;
if (errno != EINTR)
throw SysError(format("acquiring/releasing lock"));
}
}
return true;
}
/* This enables us to check whether are not already holding a lock on
a file ourselves. POSIX locks (fcntl) suck in this respect: if we
close a descriptor, the previous lock will be closed as well. And
there is no way to query whether we already have a lock (F_GETLK
only works on locks held by other processes). */
static StringSet lockedPaths; /* !!! not thread-safe */
PathLocks::PathLocks()
: deletePaths(false)
{
}
PathLocks::PathLocks(const PathSet & paths, const string & waitMsg)
: deletePaths(false)
{
lockPaths(paths, waitMsg);
}
bool PathLocks::lockPaths(const PathSet & _paths,
const string & waitMsg, bool wait)
{
assert(fds.empty());
/* Note that `fds' is built incrementally so that the destructor
will only release those locks that we have already acquired. */
/* Sort the paths. This assures that locks are always acquired in
the same order, thus preventing deadlocks. */
Paths paths(_paths.begin(), _paths.end());
paths.sort();
/* Acquire the lock for each path. */
foreach (Paths::iterator, i, paths) {
checkInterrupt();
Path path = *i;
Path lockPath = path + ".lock";
debug(format("locking path `%1%'") % path);
if (lockedPaths.find(lockPath) != lockedPaths.end())
throw Error("deadlock: trying to re-acquire self-held lock");
AutoCloseFD fd;
while (1) {
/* Open/create the lock file. */
fd = openLockFile(lockPath, true);
/* Acquire an exclusive lock. */
if (!lockFile(fd, ltWrite, false)) {
if (wait) {
if (waitMsg != "") printMsg(lvlError, waitMsg);
lockFile(fd, ltWrite, true);
} else {
/* Failed to lock this path; release all other
locks. */
unlock();
return false;
}
}
debug(format("lock acquired on `%1%'") % lockPath);
/* Check that the lock file hasn't become stale (i.e.,
hasn't been unlinked). */
struct stat st;
if (fstat(fd, &st) == -1)
throw SysError(format("statting lock file `%1%'") % lockPath);
if (st.st_size != 0)
/* This lock file has been unlinked, so we're holding
a lock on a deleted file. This means that other
processes may create and acquire a lock on
`lockPath', and proceed. So we must retry. */
debug(format("open lock file `%1%' has become stale") % lockPath);
else
break;
}
/* Use borrow so that the descriptor isn't closed. */
fds.push_back(FDPair(fd.borrow(), lockPath));
lockedPaths.insert(lockPath);
}
return true;
}
PathLocks::~PathLocks()
{
unlock();
}
void PathLocks::unlock()
{
foreach (list<FDPair>::iterator, i, fds) {
if (deletePaths) deleteLockFile(i->second, i->first);
lockedPaths.erase(i->second);
if (close(i->first) == -1)
printMsg(lvlError,
format("error (ignored): cannot close lock file on `%1%'") % i->second);
debug(format("lock released on `%1%'") % i->second);
}
fds.clear();
}
void PathLocks::setDeletion(bool deletePaths)
{
this->deletePaths = deletePaths;
}
bool pathIsLockedByMe(const Path & path)
{
Path lockPath = path + ".lock";
return lockedPaths.find(lockPath) != lockedPaths.end();
}
}

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#pragma once
#include "types.hh"
namespace nix {
/* Open (possibly create) a lock file and return the file descriptor.
-1 is returned if create is false and the lock could not be opened
because it doesn't exist. Any other error throws an exception. */
int openLockFile(const Path & path, bool create);
/* Delete an open lock file. */
void deleteLockFile(const Path & path, int fd);
enum LockType { ltRead, ltWrite, ltNone };
bool lockFile(int fd, LockType lockType, bool wait);
class PathLocks
{
private:
typedef std::pair<int, Path> FDPair;
list<FDPair> fds;
bool deletePaths;
public:
PathLocks();
PathLocks(const PathSet & paths,
const string & waitMsg = "");
bool lockPaths(const PathSet & _paths,
const string & waitMsg = "",
bool wait = true);
~PathLocks();
void unlock();
void setDeletion(bool deletePaths);
};
bool pathIsLockedByMe(const Path & path);
}

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#include "references.hh"
#include "hash.hh"
#include "util.hh"
#include "archive.hh"
#include <map>
#include <cstdlib>
namespace nix {
static unsigned int refLength = 32; /* characters */
static void search(const unsigned char * s, unsigned int len,
StringSet & hashes, StringSet & seen)
{
static bool initialised = false;
static bool isBase32[256];
if (!initialised) {
for (unsigned int i = 0; i < 256; ++i) isBase32[i] = false;
for (unsigned int i = 0; i < base32Chars.size(); ++i)
isBase32[(unsigned char) base32Chars[i]] = true;
initialised = true;
}
for (unsigned int i = 0; i + refLength <= len; ) {
int j;
bool match = true;
for (j = refLength - 1; j >= 0; --j)
if (!isBase32[(unsigned char) s[i + j]]) {
i += j + 1;
match = false;
break;
}
if (!match) continue;
string ref((const char *) s + i, refLength);
if (hashes.find(ref) != hashes.end()) {
debug(format("found reference to `%1%' at offset `%2%'")
% ref % i);
seen.insert(ref);
hashes.erase(ref);
}
++i;
}
}
struct RefScanSink : Sink
{
HashSink hashSink;
StringSet hashes;
StringSet seen;
string tail;
RefScanSink() : hashSink(htSHA256) { }
void operator () (const unsigned char * data, size_t len);
};
void RefScanSink::operator () (const unsigned char * data, size_t len)
{
hashSink(data, len);
/* It's possible that a reference spans the previous and current
fragment, so search in the concatenation of the tail of the
previous fragment and the start of the current fragment. */
string s = tail + string((const char *) data, len > refLength ? refLength : len);
search((const unsigned char *) s.data(), s.size(), hashes, seen);
search(data, len, hashes, seen);
unsigned int tailLen = len <= refLength ? len : refLength;
tail =
string(tail, tail.size() < refLength - tailLen ? 0 : tail.size() - (refLength - tailLen)) +
string((const char *) data + len - tailLen, tailLen);
}
PathSet scanForReferences(const string & path,
const PathSet & refs, HashResult & hash)
{
RefScanSink sink;
std::map<string, Path> backMap;
/* For efficiency (and a higher hit rate), just search for the
hash part of the file name. (This assumes that all references
have the form `HASH-bla'). */
foreach (PathSet::const_iterator, i, refs) {
string baseName = baseNameOf(*i);
string::size_type pos = baseName.find('-');
if (pos == string::npos)
throw Error(format("bad reference `%1%'") % *i);
string s = string(baseName, 0, pos);
assert(s.size() == refLength);
assert(backMap.find(s) == backMap.end());
// parseHash(htSHA256, s);
sink.hashes.insert(s);
backMap[s] = *i;
}
/* Look for the hashes in the NAR dump of the path. */
dumpPath(path, sink);
/* Map the hashes found back to their store paths. */
PathSet found;
foreach (StringSet::iterator, i, sink.seen) {
std::map<string, Path>::iterator j;
if ((j = backMap.find(*i)) == backMap.end()) abort();
found.insert(j->second);
}
hash = sink.hashSink.finish();
return found;
}
}

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#pragma once
#include "types.hh"
#include "hash.hh"
namespace nix {
PathSet scanForReferences(const Path & path, const PathSet & refs,
HashResult & hash);
}

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#include "serialise.hh"
#include "util.hh"
#include "remote-store.hh"
#include "worker-protocol.hh"
#include "archive.hh"
#include "affinity.hh"
#include "globals.hh"
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <fcntl.h>
#include <iostream>
#include <unistd.h>
#include <cstring>
namespace nix {
Path readStorePath(Source & from)
{
Path path = readString(from);
assertStorePath(path);
return path;
}
template<class T> T readStorePaths(Source & from)
{
T paths = readStrings<T>(from);
foreach (typename T::iterator, i, paths) assertStorePath(*i);
return paths;
}
template PathSet readStorePaths(Source & from);
RemoteStore::RemoteStore()
{
initialised = false;
}
void RemoteStore::openConnection(bool reserveSpace)
{
if (initialised) return;
initialised = true;
string remoteMode = getEnv("NIX_REMOTE");
if (remoteMode == "daemon")
/* Connect to a daemon that does the privileged work for
us. */
connectToDaemon();
else
throw Error(format("invalid setting for NIX_REMOTE, `%1%'") % remoteMode);
from.fd = fdSocket;
to.fd = fdSocket;
/* Send the magic greeting, check for the reply. */
try {
writeInt(WORKER_MAGIC_1, to);
to.flush();
unsigned int magic = readInt(from);
if (magic != WORKER_MAGIC_2) throw Error("protocol mismatch");
daemonVersion = readInt(from);
if (GET_PROTOCOL_MAJOR(daemonVersion) != GET_PROTOCOL_MAJOR(PROTOCOL_VERSION))
throw Error("Nix daemon protocol version not supported");
writeInt(PROTOCOL_VERSION, to);
if (GET_PROTOCOL_MINOR(daemonVersion) >= 14) {
int cpu = settings.lockCPU ? lockToCurrentCPU() : -1;
if (cpu != -1) {
writeInt(1, to);
writeInt(cpu, to);
} else
writeInt(0, to);
}
if (GET_PROTOCOL_MINOR(daemonVersion) >= 11)
writeInt(reserveSpace, to);
processStderr();
}
catch (Error & e) {
throw Error(format("cannot start worker (%1%)")
% e.msg());
}
setOptions();
}
void RemoteStore::connectToDaemon()
{
fdSocket = socket(PF_UNIX, SOCK_STREAM, 0);
if (fdSocket == -1)
throw SysError("cannot create Unix domain socket");
closeOnExec(fdSocket);
string socketPath = settings.nixDaemonSocketFile;
/* Urgh, sockaddr_un allows path names of only 108 characters. So
chdir to the socket directory so that we can pass a relative
path name. !!! this is probably a bad idea in multi-threaded
applications... */
AutoCloseFD fdPrevDir = open(".", O_RDONLY);
if (fdPrevDir == -1) throw SysError("couldn't open current directory");
chdir(dirOf(socketPath).c_str());
Path socketPathRel = "./" + baseNameOf(socketPath);
struct sockaddr_un addr;
addr.sun_family = AF_UNIX;
if (socketPathRel.size() >= sizeof(addr.sun_path))
throw Error(format("socket path `%1%' is too long") % socketPathRel);
using namespace std;
strcpy(addr.sun_path, socketPathRel.c_str());
if (connect(fdSocket, (struct sockaddr *) &addr, sizeof(addr)) == -1)
throw SysError(format("cannot connect to daemon at `%1%'") % socketPath);
if (fchdir(fdPrevDir) == -1)
throw SysError("couldn't change back to previous directory");
}
RemoteStore::~RemoteStore()
{
try {
to.flush();
fdSocket.close();
if (child != -1)
child.wait(true);
} catch (...) {
ignoreException();
}
}
void RemoteStore::setOptions()
{
writeInt(wopSetOptions, to);
writeInt(settings.keepFailed, to);
writeInt(settings.keepGoing, to);
writeInt(settings.tryFallback, to);
writeInt(verbosity, to);
writeInt(settings.maxBuildJobs, to);
writeInt(settings.maxSilentTime, to);
if (GET_PROTOCOL_MINOR(daemonVersion) >= 2)
writeInt(settings.useBuildHook, to);
if (GET_PROTOCOL_MINOR(daemonVersion) >= 4) {
writeInt(settings.buildVerbosity, to);
writeInt(logType, to);
writeInt(settings.printBuildTrace, to);
}
if (GET_PROTOCOL_MINOR(daemonVersion) >= 6)
writeInt(settings.buildCores, to);
if (GET_PROTOCOL_MINOR(daemonVersion) >= 10)
writeInt(settings.useSubstitutes, to);
if (GET_PROTOCOL_MINOR(daemonVersion) >= 12) {
Settings::SettingsMap overrides = settings.getOverrides();
writeInt(overrides.size(), to);
foreach (Settings::SettingsMap::iterator, i, overrides) {
writeString(i->first, to);
writeString(i->second, to);
}
}
processStderr();
}
bool RemoteStore::isValidPath(const Path & path)
{
openConnection();
writeInt(wopIsValidPath, to);
writeString(path, to);
processStderr();
unsigned int reply = readInt(from);
return reply != 0;
}
PathSet RemoteStore::queryValidPaths(const PathSet & paths)
{
openConnection();
if (GET_PROTOCOL_MINOR(daemonVersion) < 12) {
PathSet res;
foreach (PathSet::const_iterator, i, paths)
if (isValidPath(*i)) res.insert(*i);
return res;
} else {
writeInt(wopQueryValidPaths, to);
writeStrings(paths, to);
processStderr();
return readStorePaths<PathSet>(from);
}
}
PathSet RemoteStore::queryAllValidPaths()
{
openConnection();
writeInt(wopQueryAllValidPaths, to);
processStderr();
return readStorePaths<PathSet>(from);
}
PathSet RemoteStore::querySubstitutablePaths(const PathSet & paths)
{
openConnection();
if (GET_PROTOCOL_MINOR(daemonVersion) < 12) {
PathSet res;
foreach (PathSet::const_iterator, i, paths) {
writeInt(wopHasSubstitutes, to);
writeString(*i, to);
processStderr();
if (readInt(from)) res.insert(*i);
}
return res;
} else {
writeInt(wopQuerySubstitutablePaths, to);
writeStrings(paths, to);
processStderr();
return readStorePaths<PathSet>(from);
}
}
void RemoteStore::querySubstitutablePathInfos(const PathSet & paths,
SubstitutablePathInfos & infos)
{
if (paths.empty()) return;
openConnection();
if (GET_PROTOCOL_MINOR(daemonVersion) < 3) return;
if (GET_PROTOCOL_MINOR(daemonVersion) < 12) {
foreach (PathSet::const_iterator, i, paths) {
SubstitutablePathInfo info;
writeInt(wopQuerySubstitutablePathInfo, to);
writeString(*i, to);
processStderr();
unsigned int reply = readInt(from);
if (reply == 0) continue;
info.deriver = readString(from);
if (info.deriver != "") assertStorePath(info.deriver);
info.references = readStorePaths<PathSet>(from);
info.downloadSize = readLongLong(from);
info.narSize = GET_PROTOCOL_MINOR(daemonVersion) >= 7 ? readLongLong(from) : 0;
infos[*i] = info;
}
} else {
writeInt(wopQuerySubstitutablePathInfos, to);
writeStrings(paths, to);
processStderr();
unsigned int count = readInt(from);
for (unsigned int n = 0; n < count; n++) {
Path path = readStorePath(from);
SubstitutablePathInfo & info(infos[path]);
info.deriver = readString(from);
if (info.deriver != "") assertStorePath(info.deriver);
info.references = readStorePaths<PathSet>(from);
info.downloadSize = readLongLong(from);
info.narSize = readLongLong(from);
}
}
}
ValidPathInfo RemoteStore::queryPathInfo(const Path & path)
{
openConnection();
writeInt(wopQueryPathInfo, to);
writeString(path, to);
processStderr();
ValidPathInfo info;
info.path = path;
info.deriver = readString(from);
if (info.deriver != "") assertStorePath(info.deriver);
info.hash = parseHash(htSHA256, readString(from));
info.references = readStorePaths<PathSet>(from);
info.registrationTime = readInt(from);
info.narSize = readLongLong(from);
return info;
}
Hash RemoteStore::queryPathHash(const Path & path)
{
openConnection();
writeInt(wopQueryPathHash, to);
writeString(path, to);
processStderr();
string hash = readString(from);
return parseHash(htSHA256, hash);
}
void RemoteStore::queryReferences(const Path & path,
PathSet & references)
{
openConnection();
writeInt(wopQueryReferences, to);
writeString(path, to);
processStderr();
PathSet references2 = readStorePaths<PathSet>(from);
references.insert(references2.begin(), references2.end());
}
void RemoteStore::queryReferrers(const Path & path,
PathSet & referrers)
{
openConnection();
writeInt(wopQueryReferrers, to);
writeString(path, to);
processStderr();
PathSet referrers2 = readStorePaths<PathSet>(from);
referrers.insert(referrers2.begin(), referrers2.end());
}
Path RemoteStore::queryDeriver(const Path & path)
{
openConnection();
writeInt(wopQueryDeriver, to);
writeString(path, to);
processStderr();
Path drvPath = readString(from);
if (drvPath != "") assertStorePath(drvPath);
return drvPath;
}
PathSet RemoteStore::queryValidDerivers(const Path & path)
{
openConnection();
writeInt(wopQueryValidDerivers, to);
writeString(path, to);
processStderr();
return readStorePaths<PathSet>(from);
}
PathSet RemoteStore::queryDerivationOutputs(const Path & path)
{
openConnection();
writeInt(wopQueryDerivationOutputs, to);
writeString(path, to);
processStderr();
return readStorePaths<PathSet>(from);
}
PathSet RemoteStore::queryDerivationOutputNames(const Path & path)
{
openConnection();
writeInt(wopQueryDerivationOutputNames, to);
writeString(path, to);
processStderr();
return readStrings<PathSet>(from);
}
Path RemoteStore::queryPathFromHashPart(const string & hashPart)
{
openConnection();
writeInt(wopQueryPathFromHashPart, to);
writeString(hashPart, to);
processStderr();
Path path = readString(from);
if (!path.empty()) assertStorePath(path);
return path;
}
Path RemoteStore::addToStore(const Path & _srcPath,
bool recursive, HashType hashAlgo, PathFilter & filter, bool repair)
{
if (repair) throw Error("repairing is not supported when building through the Nix daemon");
openConnection();
Path srcPath(absPath(_srcPath));
writeInt(wopAddToStore, to);
writeString(baseNameOf(srcPath), to);
/* backwards compatibility hack */
writeInt((hashAlgo == htSHA256 && recursive) ? 0 : 1, to);
writeInt(recursive ? 1 : 0, to);
writeString(printHashType(hashAlgo), to);
dumpPath(srcPath, to, filter);
processStderr();
return readStorePath(from);
}
Path RemoteStore::addTextToStore(const string & name, const string & s,
const PathSet & references, bool repair)
{
if (repair) throw Error("repairing is not supported when building through the Nix daemon");
openConnection();
writeInt(wopAddTextToStore, to);
writeString(name, to);
writeString(s, to);
writeStrings(references, to);
processStderr();
return readStorePath(from);
}
void RemoteStore::exportPath(const Path & path, bool sign,
Sink & sink)
{
openConnection();
writeInt(wopExportPath, to);
writeString(path, to);
writeInt(sign ? 1 : 0, to);
processStderr(&sink); /* sink receives the actual data */
readInt(from);
}
Paths RemoteStore::importPaths(bool requireSignature, Source & source)
{
openConnection();
writeInt(wopImportPaths, to);
/* We ignore requireSignature, since the worker forces it to true
anyway. */
processStderr(0, &source);
return readStorePaths<Paths>(from);
}
void RemoteStore::buildPaths(const PathSet & drvPaths, BuildMode buildMode)
{
if (buildMode != bmNormal) throw Error("repairing or checking is not supported when building through the Nix daemon");
openConnection();
writeInt(wopBuildPaths, to);
if (GET_PROTOCOL_MINOR(daemonVersion) >= 13)
writeStrings(drvPaths, to);
else {
/* For backwards compatibility with old daemons, strip output
identifiers. */
PathSet drvPaths2;
foreach (PathSet::const_iterator, i, drvPaths)
drvPaths2.insert(string(*i, 0, i->find('!')));
writeStrings(drvPaths2, to);
}
processStderr();
readInt(from);
}
void RemoteStore::ensurePath(const Path & path)
{
openConnection();
writeInt(wopEnsurePath, to);
writeString(path, to);
processStderr();
readInt(from);
}
void RemoteStore::addTempRoot(const Path & path)
{
openConnection();
writeInt(wopAddTempRoot, to);
writeString(path, to);
processStderr();
readInt(from);
}
void RemoteStore::addIndirectRoot(const Path & path)
{
openConnection();
writeInt(wopAddIndirectRoot, to);
writeString(path, to);
processStderr();
readInt(from);
}
void RemoteStore::syncWithGC()
{
openConnection();
writeInt(wopSyncWithGC, to);
processStderr();
readInt(from);
}
Roots RemoteStore::findRoots()
{
openConnection();
writeInt(wopFindRoots, to);
processStderr();
unsigned int count = readInt(from);
Roots result;
while (count--) {
Path link = readString(from);
Path target = readStorePath(from);
result[link] = target;
}
return result;
}
void RemoteStore::collectGarbage(const GCOptions & options, GCResults & results)
{
openConnection(false);
writeInt(wopCollectGarbage, to);
writeInt(options.action, to);
writeStrings(options.pathsToDelete, to);
writeInt(options.ignoreLiveness, to);
writeLongLong(options.maxFreed, to);
writeInt(0, to);
if (GET_PROTOCOL_MINOR(daemonVersion) >= 5) {
/* removed options */
writeInt(0, to);
writeInt(0, to);
}
processStderr();
results.paths = readStrings<PathSet>(from);
results.bytesFreed = readLongLong(from);
readLongLong(from); // obsolete
}
PathSet RemoteStore::queryFailedPaths()
{
openConnection();
writeInt(wopQueryFailedPaths, to);
processStderr();
return readStorePaths<PathSet>(from);
}
void RemoteStore::clearFailedPaths(const PathSet & paths)
{
openConnection();
writeInt(wopClearFailedPaths, to);
writeStrings(paths, to);
processStderr();
readInt(from);
}
void RemoteStore::processStderr(Sink * sink, Source * source)
{
to.flush();
unsigned int msg;
while ((msg = readInt(from)) == STDERR_NEXT
|| msg == STDERR_READ || msg == STDERR_WRITE) {
if (msg == STDERR_WRITE) {
string s = readString(from);
if (!sink) throw Error("no sink");
(*sink)((const unsigned char *) s.data(), s.size());
}
else if (msg == STDERR_READ) {
if (!source) throw Error("no source");
size_t len = readInt(from);
unsigned char * buf = new unsigned char[len];
AutoDeleteArray<unsigned char> d(buf);
writeString(buf, source->read(buf, len), to);
to.flush();
}
else {
string s = readString(from);
writeToStderr(s);
}
}
if (msg == STDERR_ERROR) {
string error = readString(from);
unsigned int status = GET_PROTOCOL_MINOR(daemonVersion) >= 8 ? readInt(from) : 1;
throw Error(format("%1%") % error, status);
}
else if (msg != STDERR_LAST)
throw Error("protocol error processing standard error");
}
}

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#pragma once
#include <string>
#include "store-api.hh"
namespace nix {
class Pipe;
class Pid;
struct FdSink;
struct FdSource;
class RemoteStore : public StoreAPI
{
public:
RemoteStore();
~RemoteStore();
/* Implementations of abstract store API methods. */
bool isValidPath(const Path & path);
PathSet queryValidPaths(const PathSet & paths);
PathSet queryAllValidPaths();
ValidPathInfo queryPathInfo(const Path & path);
Hash queryPathHash(const Path & path);
void queryReferences(const Path & path, PathSet & references);
void queryReferrers(const Path & path, PathSet & referrers);
Path queryDeriver(const Path & path);
PathSet queryValidDerivers(const Path & path);
PathSet queryDerivationOutputs(const Path & path);
StringSet queryDerivationOutputNames(const Path & path);
Path queryPathFromHashPart(const string & hashPart);
PathSet querySubstitutablePaths(const PathSet & paths);
void querySubstitutablePathInfos(const PathSet & paths,
SubstitutablePathInfos & infos);
Path addToStore(const Path & srcPath,
bool recursive = true, HashType hashAlgo = htSHA256,
PathFilter & filter = defaultPathFilter, bool repair = false);
Path addTextToStore(const string & name, const string & s,
const PathSet & references, bool repair = false);
void exportPath(const Path & path, bool sign,
Sink & sink);
Paths importPaths(bool requireSignature, Source & source);
void buildPaths(const PathSet & paths, BuildMode buildMode);
void ensurePath(const Path & path);
void addTempRoot(const Path & path);
void addIndirectRoot(const Path & path);
void syncWithGC();
Roots findRoots();
void collectGarbage(const GCOptions & options, GCResults & results);
PathSet queryFailedPaths();
void clearFailedPaths(const PathSet & paths);
private:
AutoCloseFD fdSocket;
FdSink to;
FdSource from;
Pid child;
unsigned int daemonVersion;
bool initialised;
void openConnection(bool reserveSpace = true);
void processStderr(Sink * sink = 0, Source * source = 0);
void connectToDaemon();
void setOptions();
};
}

44
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create table if not exists ValidPaths (
id integer primary key autoincrement not null,
path text unique not null,
hash text not null,
registrationTime integer not null,
deriver text,
narSize integer
);
create table if not exists Refs (
referrer integer not null,
reference integer not null,
primary key (referrer, reference),
foreign key (referrer) references ValidPaths(id) on delete cascade,
foreign key (reference) references ValidPaths(id) on delete restrict
);
create index if not exists IndexReferrer on Refs(referrer);
create index if not exists IndexReference on Refs(reference);
-- Paths can refer to themselves, causing a tuple (N, N) in the Refs
-- table. This causes a deletion of the corresponding row in
-- ValidPaths to cause a foreign key constraint violation (due to `on
-- delete restrict' on the `reference' column). Therefore, explicitly
-- get rid of self-references.
create trigger if not exists DeleteSelfRefs before delete on ValidPaths
begin
delete from Refs where referrer = old.id and reference = old.id;
end;
create table if not exists DerivationOutputs (
drv integer not null,
id text not null, -- symbolic output id, usually "out"
path text not null,
primary key (drv, id),
foreign key (drv) references ValidPaths(id) on delete cascade
);
create index if not exists IndexDerivationOutputs on DerivationOutputs(path);
create table if not exists FailedPaths (
path text primary key not null,
time integer not null
);

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#include "store-api.hh"
#include "globals.hh"
#include "util.hh"
#include <climits>
namespace nix {
GCOptions::GCOptions()
{
action = gcDeleteDead;
ignoreLiveness = false;
maxFreed = ULLONG_MAX;
}
bool isInStore(const Path & path)
{
return isInDir(path, settings.nixStore);
}
bool isStorePath(const Path & path)
{
return isInStore(path)
&& path.find('/', settings.nixStore.size() + 1) == Path::npos;
}
void assertStorePath(const Path & path)
{
if (!isStorePath(path))
throw Error(format("path `%1%' is not in the Nix store") % path);
}
Path toStorePath(const Path & path)
{
if (!isInStore(path))
throw Error(format("path `%1%' is not in the Nix store") % path);
Path::size_type slash = path.find('/', settings.nixStore.size() + 1);
if (slash == Path::npos)
return path;
else
return Path(path, 0, slash);
}
Path followLinksToStore(const Path & _path)
{
Path path = absPath(_path);
while (!isInStore(path)) {
if (!isLink(path)) break;
string target = readLink(path);
path = absPath(target, dirOf(path));
}
if (!isInStore(path))
throw Error(format("path `%1%' is not in the Nix store") % path);
return path;
}
Path followLinksToStorePath(const Path & path)
{
return toStorePath(followLinksToStore(path));
}
string storePathToName(const Path & path)
{
assertStorePath(path);
return string(path, settings.nixStore.size() + 34);
}
void checkStoreName(const string & name)
{
string validChars = "+-._?=";
/* Disallow names starting with a dot for possible security
reasons (e.g., "." and ".."). */
if (string(name, 0, 1) == ".")
throw Error(format("illegal name: `%1%'") % name);
foreach (string::const_iterator, i, name)
if (!((*i >= 'A' && *i <= 'Z') ||
(*i >= 'a' && *i <= 'z') ||
(*i >= '0' && *i <= '9') ||
validChars.find(*i) != string::npos))
{
throw Error(format("invalid character `%1%' in name `%2%'")
% *i % name);
}
}
/* Store paths have the following form:
<store>/<h>-<name>
where
<store> = the location of the Nix store, usually /nix/store
<name> = a human readable name for the path, typically obtained
from the name attribute of the derivation, or the name of the
source file from which the store path is created. For derivation
outputs other than the default "out" output, the string "-<id>"
is suffixed to <name>.
<h> = base-32 representation of the first 160 bits of a SHA-256
hash of <s>; the hash part of the store name
<s> = the string "<type>:sha256:<h2>:<store>:<name>";
note that it includes the location of the store as well as the
name to make sure that changes to either of those are reflected
in the hash (e.g. you won't get /nix/store/<h>-name1 and
/nix/store/<h>-name2 with equal hash parts).
<type> = one of:
"text:<r1>:<r2>:...<rN>"
for plain text files written to the store using
addTextToStore(); <r1> ... <rN> are the references of the
path.
"source"
for paths copied to the store using addToStore() when recursive
= true and hashAlgo = "sha256"
"output:<id>"
for either the outputs created by derivations, OR paths copied
to the store using addToStore() with recursive != true or
hashAlgo != "sha256" (in that case "source" is used; it's
silly, but it's done that way for compatibility). <id> is the
name of the output (usually, "out").
<h2> = base-16 representation of a SHA-256 hash of:
if <type> = "text:...":
the string written to the resulting store path
if <type> = "source":
the serialisation of the path from which this store path is
copied, as returned by hashPath()
if <type> = "output:out":
for non-fixed derivation outputs:
the derivation (see hashDerivationModulo() in
primops.cc)
for paths copied by addToStore() or produced by fixed-output
derivations:
the string "fixed:out:<rec><algo>:<hash>:", where
<rec> = "r:" for recursive (path) hashes, or "" or flat
(file) hashes
<algo> = "md5", "sha1" or "sha256"
<hash> = base-16 representation of the path or flat hash of
the contents of the path (or expected contents of the
path for fixed-output derivations)
It would have been nicer to handle fixed-output derivations under
"source", e.g. have something like "source:<rec><algo>", but we're
stuck with this for now...
The main reason for this way of computing names is to prevent name
collisions (for security). For instance, it shouldn't be feasible
to come up with a derivation whose output path collides with the
path for a copied source. The former would have a <s> starting with
"output:out:", while the latter would have a <2> starting with
"source:".
*/
Path makeStorePath(const string & type,
const Hash & hash, const string & name)
{
/* e.g., "source:sha256:1abc...:/nix/store:foo.tar.gz" */
string s = type + ":sha256:" + printHash(hash) + ":"
+ settings.nixStore + ":" + name;
checkStoreName(name);
return settings.nixStore + "/"
+ printHash32(compressHash(hashString(htSHA256, s), 20))
+ "-" + name;
}
Path makeOutputPath(const string & id,
const Hash & hash, const string & name)
{
return makeStorePath("output:" + id, hash,
name + (id == "out" ? "" : "-" + id));
}
Path makeFixedOutputPath(bool recursive,
HashType hashAlgo, Hash hash, string name)
{
return hashAlgo == htSHA256 && recursive
? makeStorePath("source", hash, name)
: makeStorePath("output:out", hashString(htSHA256,
"fixed:out:" + (recursive ? (string) "r:" : "") +
printHashType(hashAlgo) + ":" + printHash(hash) + ":"),
name);
}
std::pair<Path, Hash> computeStorePathForPath(const Path & srcPath,
bool recursive, HashType hashAlgo, PathFilter & filter)
{
HashType ht(hashAlgo);
Hash h = recursive ? hashPath(ht, srcPath, filter).first : hashFile(ht, srcPath);
string name = baseNameOf(srcPath);
Path dstPath = makeFixedOutputPath(recursive, hashAlgo, h, name);
return std::pair<Path, Hash>(dstPath, h);
}
Path computeStorePathForText(const string & name, const string & s,
const PathSet & references)
{
Hash hash = hashString(htSHA256, s);
/* Stuff the references (if any) into the type. This is a bit
hacky, but we can't put them in `s' since that would be
ambiguous. */
string type = "text";
foreach (PathSet::const_iterator, i, references) {
type += ":";
type += *i;
}
return makeStorePath(type, hash, name);
}
/* Return a string accepted by decodeValidPathInfo() that
registers the specified paths as valid. Note: it's the
responsibility of the caller to provide a closure. */
string StoreAPI::makeValidityRegistration(const PathSet & paths,
bool showDerivers, bool showHash)
{
string s = "";
foreach (PathSet::iterator, i, paths) {
s += *i + "\n";
ValidPathInfo info = queryPathInfo(*i);
if (showHash) {
s += printHash(info.hash) + "\n";
s += (format("%1%\n") % info.narSize).str();
}
Path deriver = showDerivers ? info.deriver : "";
s += deriver + "\n";
s += (format("%1%\n") % info.references.size()).str();
foreach (PathSet::iterator, j, info.references)
s += *j + "\n";
}
return s;
}
ValidPathInfo decodeValidPathInfo(std::istream & str, bool hashGiven)
{
ValidPathInfo info;
getline(str, info.path);
if (str.eof()) { info.path = ""; return info; }
if (hashGiven) {
string s;
getline(str, s);
info.hash = parseHash(htSHA256, s);
getline(str, s);
if (!string2Int(s, info.narSize)) throw Error("number expected");
}
getline(str, info.deriver);
string s; int n;
getline(str, s);
if (!string2Int(s, n)) throw Error("number expected");
while (n--) {
getline(str, s);
info.references.insert(s);
}
if (!str || str.eof()) throw Error("missing input");
return info;
}
string showPaths(const PathSet & paths)
{
string s;
foreach (PathSet::const_iterator, i, paths) {
if (s.size() != 0) s += ", ";
s += "`" + *i + "'";
}
return s;
}
void exportPaths(StoreAPI & store, const Paths & paths,
bool sign, Sink & sink)
{
foreach (Paths::const_iterator, i, paths) {
writeInt(1, sink);
store.exportPath(*i, sign, sink);
}
writeInt(0, sink);
}
}
#include "local-store.hh"
#include "serialise.hh"
#include "remote-store.hh"
namespace nix {
std::shared_ptr<StoreAPI> store;
std::shared_ptr<StoreAPI> openStore(bool reserveSpace)
{
if (getEnv("NIX_REMOTE") == "")
return std::shared_ptr<StoreAPI>(new LocalStore(reserveSpace));
else
return std::shared_ptr<StoreAPI>(new RemoteStore());
}
}

366
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#pragma once
#include "hash.hh"
#include "serialise.hh"
#include <string>
#include <map>
#include <memory>
namespace nix {
typedef std::map<Path, Path> Roots;
struct GCOptions
{
/* Garbage collector operation:
- `gcReturnLive': return the set of paths reachable from
(i.e. in the closure of) the roots.
- `gcReturnDead': return the set of paths not reachable from
the roots.
- `gcDeleteDead': actually delete the latter set.
- `gcDeleteSpecific': delete the paths listed in
`pathsToDelete', insofar as they are not reachable.
*/
typedef enum {
gcReturnLive,
gcReturnDead,
gcDeleteDead,
gcDeleteSpecific,
} GCAction;
GCAction action;
/* If `ignoreLiveness' is set, then reachability from the roots is
ignored (dangerous!). However, the paths must still be
unreferenced *within* the store (i.e., there can be no other
store paths that depend on them). */
bool ignoreLiveness;
/* For `gcDeleteSpecific', the paths to delete. */
PathSet pathsToDelete;
/* Stop after at least `maxFreed' bytes have been freed. */
unsigned long long maxFreed;
GCOptions();
};
struct GCResults
{
/* Depending on the action, the GC roots, or the paths that would
be or have been deleted. */
PathSet paths;
/* For `gcReturnDead', `gcDeleteDead' and `gcDeleteSpecific', the
number of bytes that would be or was freed. */
unsigned long long bytesFreed;
GCResults()
{
bytesFreed = 0;
}
};
struct SubstitutablePathInfo
{
Path deriver;
PathSet references;
unsigned long long downloadSize; /* 0 = unknown or inapplicable */
unsigned long long narSize; /* 0 = unknown */
};
typedef std::map<Path, SubstitutablePathInfo> SubstitutablePathInfos;
struct ValidPathInfo
{
Path path;
Path deriver;
Hash hash;
PathSet references;
time_t registrationTime;
unsigned long long narSize; // 0 = unknown
unsigned long long id; // internal use only
ValidPathInfo() : registrationTime(0), narSize(0) { }
};
typedef list<ValidPathInfo> ValidPathInfos;
enum BuildMode { bmNormal, bmRepair, bmCheck };
class StoreAPI
{
public:
virtual ~StoreAPI() { }
/* Check whether a path is valid. */
virtual bool isValidPath(const Path & path) = 0;
/* Query which of the given paths is valid. */
virtual PathSet queryValidPaths(const PathSet & paths) = 0;
/* Query the set of all valid paths. */
virtual PathSet queryAllValidPaths() = 0;
/* Query information about a valid path. */
virtual ValidPathInfo queryPathInfo(const Path & path) = 0;
/* Query the hash of a valid path. */
virtual Hash queryPathHash(const Path & path) = 0;
/* Query the set of outgoing FS references for a store path. The
result is not cleared. */
virtual void queryReferences(const Path & path,
PathSet & references) = 0;
/* Queries the set of incoming FS references for a store path.
The result is not cleared. */
virtual void queryReferrers(const Path & path,
PathSet & referrers) = 0;
/* Query the deriver of a store path. Return the empty string if
no deriver has been set. */
virtual Path queryDeriver(const Path & path) = 0;
/* Return all currently valid derivations that have `path' as an
output. (Note that the result of `queryDeriver()' is the
derivation that was actually used to produce `path', which may
not exist anymore.) */
virtual PathSet queryValidDerivers(const Path & path) = 0;
/* Query the outputs of the derivation denoted by `path'. */
virtual PathSet queryDerivationOutputs(const Path & path) = 0;
/* Query the output names of the derivation denoted by `path'. */
virtual StringSet queryDerivationOutputNames(const Path & path) = 0;
/* Query the full store path given the hash part of a valid store
path, or "" if the path doesn't exist. */
virtual Path queryPathFromHashPart(const string & hashPart) = 0;
/* Query which of the given paths have substitutes. */
virtual PathSet querySubstitutablePaths(const PathSet & paths) = 0;
/* Query substitute info (i.e. references, derivers and download
sizes) of a set of paths. If a path does not have substitute
info, it's omitted from the resulting ‘infos’ map. */
virtual void querySubstitutablePathInfos(const PathSet & paths,
SubstitutablePathInfos & infos) = 0;
/* Copy the contents of a path to the store and register the
validity the resulting path. The resulting path is returned.
The function object `filter' can be used to exclude files (see
libutil/archive.hh). */
virtual Path addToStore(const Path & srcPath,
bool recursive = true, HashType hashAlgo = htSHA256,
PathFilter & filter = defaultPathFilter, bool repair = false) = 0;
/* Like addToStore, but the contents written to the output path is
a regular file containing the given string. */
virtual Path addTextToStore(const string & name, const string & s,
const PathSet & references, bool repair = false) = 0;
/* Export a store path, that is, create a NAR dump of the store
path and append its references and its deriver. Optionally, a
cryptographic signature (created by OpenSSL) of the preceding
data is attached. */
virtual void exportPath(const Path & path, bool sign,
Sink & sink) = 0;
/* Import a sequence of NAR dumps created by exportPaths() into
the Nix store. */
virtual Paths importPaths(bool requireSignature, Source & source) = 0;
/* For each path, if it's a derivation, build it. Building a
derivation means ensuring that the output paths are valid. If
they are already valid, this is a no-op. Otherwise, validity
can be reached in two ways. First, if the output paths is
substitutable, then build the path that way. Second, the
output paths can be created by running the builder, after
recursively building any sub-derivations. For inputs that are
not derivations, substitute them. */
virtual void buildPaths(const PathSet & paths, BuildMode buildMode = bmNormal) = 0;
/* Ensure that a path is valid. If it is not currently valid, it
may be made valid by running a substitute (if defined for the
path). */
virtual void ensurePath(const Path & path) = 0;
/* Add a store path as a temporary root of the garbage collector.
The root disappears as soon as we exit. */
virtual void addTempRoot(const Path & path) = 0;
/* Add an indirect root, which is merely a symlink to `path' from
/nix/var/nix/gcroots/auto/<hash of `path'>. `path' is supposed
to be a symlink to a store path. The garbage collector will
automatically remove the indirect root when it finds that
`path' has disappeared. */
virtual void addIndirectRoot(const Path & path) = 0;
/* Acquire the global GC lock, then immediately release it. This
function must be called after registering a new permanent root,
but before exiting. Otherwise, it is possible that a running
garbage collector doesn't see the new root and deletes the
stuff we've just built. By acquiring the lock briefly, we
ensure that either:
- The collector is already running, and so we block until the
collector is finished. The collector will know about our
*temporary* locks, which should include whatever it is we
want to register as a permanent lock.
- The collector isn't running, or it's just started but hasn't
acquired the GC lock yet. In that case we get and release
the lock right away, then exit. The collector scans the
permanent root and sees our's.
In either case the permanent root is seen by the collector. */
virtual void syncWithGC() = 0;
/* Find the roots of the garbage collector. Each root is a pair
(link, storepath) where `link' is the path of the symlink
outside of the Nix store that point to `storePath'. */
virtual Roots findRoots() = 0;
/* Perform a garbage collection. */
virtual void collectGarbage(const GCOptions & options, GCResults & results) = 0;
/* Return the set of paths that have failed to build.*/
virtual PathSet queryFailedPaths() = 0;
/* Clear the "failed" status of the given paths. The special
value `*' causes all failed paths to be cleared. */
virtual void clearFailedPaths(const PathSet & paths) = 0;
/* Return a string representing information about the path that
can be loaded into the database using `nix-store --load-db' or
`nix-store --register-validity'. */
string makeValidityRegistration(const PathSet & paths,
bool showDerivers, bool showHash);
};
/* !!! These should be part of the store API, I guess. */
/* Throw an exception if `path' is not directly in the Nix store. */
void assertStorePath(const Path & path);
bool isInStore(const Path & path);
bool isStorePath(const Path & path);
/* Extract the name part of the given store path. */
string storePathToName(const Path & path);
void checkStoreName(const string & name);
/* Chop off the parts after the top-level store name, e.g.,
/nix/store/abcd-foo/bar => /nix/store/abcd-foo. */
Path toStorePath(const Path & path);
/* Follow symlinks until we end up with a path in the Nix store. */
Path followLinksToStore(const Path & path);
/* Same as followLinksToStore(), but apply toStorePath() to the
result. */
Path followLinksToStorePath(const Path & path);
/* Constructs a unique store path name. */
Path makeStorePath(const string & type,
const Hash & hash, const string & name);
Path makeOutputPath(const string & id,
const Hash & hash, const string & name);
Path makeFixedOutputPath(bool recursive,
HashType hashAlgo, Hash hash, string name);
/* This is the preparatory part of addToStore() and addToStoreFixed();
it computes the store path to which srcPath is to be copied.
Returns the store path and the cryptographic hash of the
contents of srcPath. */
std::pair<Path, Hash> computeStorePathForPath(const Path & srcPath,
bool recursive = true, HashType hashAlgo = htSHA256,
PathFilter & filter = defaultPathFilter);
/* Preparatory part of addTextToStore().
!!! Computation of the path should take the references given to
addTextToStore() into account, otherwise we have a (relatively
minor) security hole: a caller can register a source file with
bogus references. If there are too many references, the path may
not be garbage collected when it has to be (not really a problem,
the caller could create a root anyway), or it may be garbage
collected when it shouldn't be (more serious).
Hashing the references would solve this (bogus references would
simply yield a different store path, so other users wouldn't be
affected), but it has some backwards compatibility issues (the
hashing scheme changes), so I'm not doing that for now. */
Path computeStorePathForText(const string & name, const string & s,
const PathSet & references);
/* Remove the temporary roots file for this process. Any temporary
root becomes garbage after this point unless it has been registered
as a (permanent) root. */
void removeTempRoots();
/* Register a permanent GC root. */
Path addPermRoot(StoreAPI & store, const Path & storePath,
const Path & gcRoot, bool indirect, bool allowOutsideRootsDir = false);
/* Sort a set of paths topologically under the references relation.
If p refers to q, then p preceeds q in this list. */
Paths topoSortPaths(StoreAPI & store, const PathSet & paths);
/* For now, there is a single global store API object, but we'll
purify that in the future. */
extern std::shared_ptr<StoreAPI> store;
/* Factory method: open the Nix database, either through the local or
remote implementation. */
std::shared_ptr<StoreAPI> openStore(bool reserveSpace = true);
/* Display a set of paths in human-readable form (i.e., between quotes
and separated by commas). */
string showPaths(const PathSet & paths);
ValidPathInfo decodeValidPathInfo(std::istream & str,
bool hashGiven = false);
/* Export multiple paths in the format expected by ‘nix-store
--import’. */
void exportPaths(StoreAPI & store, const Paths & paths,
bool sign, Sink & sink);
MakeError(SubstError, Error)
MakeError(BuildError, Error) /* denotes a permanent build failure */
}

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#pragma once
namespace nix {
#define WORKER_MAGIC_1 0x6e697863
#define WORKER_MAGIC_2 0x6478696f
#define PROTOCOL_VERSION 0x10e
#define GET_PROTOCOL_MAJOR(x) ((x) & 0xff00)
#define GET_PROTOCOL_MINOR(x) ((x) & 0x00ff)
typedef enum {
wopQuit = 0,
wopIsValidPath = 1,
wopHasSubstitutes = 3,
wopQueryPathHash = 4,
wopQueryReferences = 5,
wopQueryReferrers = 6,
wopAddToStore = 7,
wopAddTextToStore = 8,
wopBuildPaths = 9,
wopEnsurePath = 10,
wopAddTempRoot = 11,
wopAddIndirectRoot = 12,
wopSyncWithGC = 13,
wopFindRoots = 14,
wopExportPath = 16,
wopQueryDeriver = 18,
wopSetOptions = 19,
wopCollectGarbage = 20,
wopQuerySubstitutablePathInfo = 21,
wopQueryDerivationOutputs = 22,
wopQueryAllValidPaths = 23,
wopQueryFailedPaths = 24,
wopClearFailedPaths = 25,
wopQueryPathInfo = 26,
wopImportPaths = 27,
wopQueryDerivationOutputNames = 28,
wopQueryPathFromHashPart = 29,
wopQuerySubstitutablePathInfos = 30,
wopQueryValidPaths = 31,
wopQuerySubstitutablePaths = 32,
wopQueryValidDerivers = 33,
} WorkerOp;
#define STDERR_NEXT 0x6f6c6d67
#define STDERR_READ 0x64617461 // data needed from source
#define STDERR_WRITE 0x64617416 // data for sink
#define STDERR_LAST 0x616c7473
#define STDERR_ERROR 0x63787470
Path readStorePath(Source & from);
template<class T> T readStorePaths(Source & from);
}

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#include "types.hh"
#include "util.hh"
#include "affinity.hh"
#if HAVE_SCHED_H
#include <sched.h>
#endif
namespace nix {
#if HAVE_SCHED_SETAFFINITY
static bool didSaveAffinity = false;
static cpu_set_t savedAffinity;
#endif
void setAffinityTo(int cpu)
{
#if HAVE_SCHED_SETAFFINITY
if (sched_getaffinity(0, sizeof(cpu_set_t), &savedAffinity) == -1) return;
didSaveAffinity = true;
printMsg(lvlDebug, format("locking this thread to CPU %1%") % cpu);
cpu_set_t newAffinity;
CPU_ZERO(&newAffinity);
CPU_SET(cpu, &newAffinity);
if (sched_setaffinity(0, sizeof(cpu_set_t), &newAffinity) == -1)
printMsg(lvlError, format("failed to lock thread to CPU %1%") % cpu);
#endif
}
int lockToCurrentCPU()
{
#if HAVE_SCHED_SETAFFINITY
int cpu = sched_getcpu();
if (cpu != -1) setAffinityTo(cpu);
return cpu;
#else
return -1;
#endif
}
void restoreAffinity()
{
#if HAVE_SCHED_SETAFFINITY
if (!didSaveAffinity) return;
if (sched_setaffinity(0, sizeof(cpu_set_t), &savedAffinity) == -1)
printMsg(lvlError, "failed to restore affinity %1%");
#endif
}
}

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#pragma once
namespace nix {
void setAffinityTo(int cpu);
int lockToCurrentCPU();
void restoreAffinity();
}

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#include "config.h"
#include <cerrno>
#include <algorithm>
#include <vector>
#define _XOPEN_SOURCE 600
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <dirent.h>
#include <fcntl.h>
#include "archive.hh"
#include "util.hh"
namespace nix {
static string archiveVersion1 = "nix-archive-1";
PathFilter defaultPathFilter;
static void dump(const string & path, Sink & sink, PathFilter & filter);
static void dumpEntries(const Path & path, Sink & sink, PathFilter & filter)
{
Strings names = readDirectory(path);
vector<string> names2(names.begin(), names.end());
sort(names2.begin(), names2.end());
for (vector<string>::iterator i = names2.begin();
i != names2.end(); ++i)
{
Path entry = path + "/" + *i;
if (filter(entry)) {
writeString("entry", sink);
writeString("(", sink);
writeString("name", sink);
writeString(*i, sink);
writeString("node", sink);
dump(entry, sink, filter);
writeString(")", sink);
}
}
}
static void dumpContents(const Path & path, size_t size,
Sink & sink)
{
writeString("contents", sink);
writeLongLong(size, sink);
AutoCloseFD fd = open(path.c_str(), O_RDONLY);
if (fd == -1) throw SysError(format("opening file `%1%'") % path);
unsigned char buf[65536];
size_t left = size;
while (left > 0) {
size_t n = left > sizeof(buf) ? sizeof(buf) : left;
readFull(fd, buf, n);
left -= n;
sink(buf, n);
}
writePadding(size, sink);
}
static void dump(const Path & path, Sink & sink, PathFilter & filter)
{
struct stat st;
if (lstat(path.c_str(), &st))
throw SysError(format("getting attributes of path `%1%'") % path);
writeString("(", sink);
if (S_ISREG(st.st_mode)) {
writeString("type", sink);
writeString("regular", sink);
if (st.st_mode & S_IXUSR) {
writeString("executable", sink);
writeString("", sink);
}
dumpContents(path, (size_t) st.st_size, sink);
}
else if (S_ISDIR(st.st_mode)) {
writeString("type", sink);
writeString("directory", sink);
dumpEntries(path, sink, filter);
}
else if (S_ISLNK(st.st_mode)) {
writeString("type", sink);
writeString("symlink", sink);
writeString("target", sink);
writeString(readLink(path), sink);
}
else throw Error(format("file `%1%' has an unknown type") % path);
writeString(")", sink);
}
void dumpPath(const Path & path, Sink & sink, PathFilter & filter)
{
writeString(archiveVersion1, sink);
dump(path, sink, filter);
}
static SerialisationError badArchive(string s)
{
return SerialisationError("bad archive: " + s);
}
static void skipGeneric(Source & source)
{
if (readString(source) == "(") {
while (readString(source) != ")")
skipGeneric(source);
}
}
static void parse(ParseSink & sink, Source & source, const Path & path);
static void parseEntry(ParseSink & sink, Source & source, const Path & path)
{
string s, name;
s = readString(source);
if (s != "(") throw badArchive("expected open tag");
while (1) {
checkInterrupt();
s = readString(source);
if (s == ")") {
break;
} else if (s == "name") {
name = readString(source);
} else if (s == "node") {
if (s == "") throw badArchive("entry name missing");
parse(sink, source, path + "/" + name);
} else {
throw badArchive("unknown field " + s);
skipGeneric(source);
}
}
}
static void parseContents(ParseSink & sink, Source & source, const Path & path)
{
unsigned long long size = readLongLong(source);
sink.preallocateContents(size);
unsigned long long left = size;
unsigned char buf[65536];
while (left) {
checkInterrupt();
unsigned int n = sizeof(buf);
if ((unsigned long long) n > left) n = left;
source(buf, n);
sink.receiveContents(buf, n);
left -= n;
}
readPadding(size, source);
}
static void parse(ParseSink & sink, Source & source, const Path & path)
{
string s;
s = readString(source);
if (s != "(") throw badArchive("expected open tag");
enum { tpUnknown, tpRegular, tpDirectory, tpSymlink } type = tpUnknown;
while (1) {
checkInterrupt();
s = readString(source);
if (s == ")") {
break;
}
else if (s == "type") {
if (type != tpUnknown)
throw badArchive("multiple type fields");
string t = readString(source);
if (t == "regular") {
type = tpRegular;
sink.createRegularFile(path);
}
else if (t == "directory") {
sink.createDirectory(path);
type = tpDirectory;
}
else if (t == "symlink") {
type = tpSymlink;
}
else throw badArchive("unknown file type " + t);
}
else if (s == "contents" && type == tpRegular) {
parseContents(sink, source, path);
}
else if (s == "executable" && type == tpRegular) {
readString(source);
sink.isExecutable();
}
else if (s == "entry" && type == tpDirectory) {
parseEntry(sink, source, path);
}
else if (s == "target" && type == tpSymlink) {
string target = readString(source);
sink.createSymlink(path, target);
}
else {
throw badArchive("unknown field " + s);
skipGeneric(source);
}
}
}
void parseDump(ParseSink & sink, Source & source)
{
string version;
try {
version = readString(source);
} catch (SerialisationError & e) {
/* This generally means the integer at the start couldn't be
decoded. Ignore and throw the exception below. */
}
if (version != archiveVersion1)
throw badArchive("input doesn't look like a Nix archive");
parse(sink, source, "");
}
struct RestoreSink : ParseSink
{
Path dstPath;
AutoCloseFD fd;
void createDirectory(const Path & path)
{
Path p = dstPath + path;
if (mkdir(p.c_str(), 0777) == -1)
throw SysError(format("creating directory `%1%'") % p);
};
void createRegularFile(const Path & path)
{
Path p = dstPath + path;
fd.close();
fd = open(p.c_str(), O_CREAT | O_EXCL | O_WRONLY, 0666);
if (fd == -1) throw SysError(format("creating file `%1%'") % p);
}
void isExecutable()
{
struct stat st;
if (fstat(fd, &st) == -1)
throw SysError("fstat");
if (fchmod(fd, st.st_mode | (S_IXUSR | S_IXGRP | S_IXOTH)) == -1)
throw SysError("fchmod");
}
void preallocateContents(unsigned long long len)
{
#if HAVE_POSIX_FALLOCATE
if (len) {
errno = posix_fallocate(fd, 0, len);
/* Note that EINVAL may indicate that the underlying
filesystem doesn't support preallocation (e.g. on
OpenSolaris). Since preallocation is just an
optimisation, ignore it. */
if (errno && errno != EINVAL)
throw SysError(format("preallocating file of %1% bytes") % len);
}
#endif
}
void receiveContents(unsigned char * data, unsigned int len)
{
writeFull(fd, data, len);
}
void createSymlink(const Path & path, const string & target)
{
Path p = dstPath + path;
nix::createSymlink(target, p);
}
};
void restorePath(const Path & path, Source & source)
{
RestoreSink sink;
sink.dstPath = path;
parseDump(sink, source);
}
}

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#pragma once
#include "types.hh"
#include "serialise.hh"
namespace nix {
/* dumpPath creates a Nix archive of the specified path. The format
is as follows:
IF path points to a REGULAR FILE:
dump(path) = attrs(
[ ("type", "regular")
, ("contents", contents(path))
])
IF path points to a DIRECTORY:
dump(path) = attrs(
[ ("type", "directory")
, ("entries", concat(map(f, sort(entries(path)))))
])
where f(fn) = attrs(
[ ("name", fn)
, ("file", dump(path + "/" + fn))
])
where:
attrs(as) = concat(map(attr, as)) + encN(0)
attrs((a, b)) = encS(a) + encS(b)
encS(s) = encN(len(s)) + s + (padding until next 64-bit boundary)
encN(n) = 64-bit little-endian encoding of n.
contents(path) = the contents of a regular file.
sort(strings) = lexicographic sort by 8-bit value (strcmp).
entries(path) = the entries of a directory, without `.' and
`..'.
`+' denotes string concatenation. */
struct PathFilter
{
virtual ~PathFilter() { }
virtual bool operator () (const Path & path) { return true; }
};
extern PathFilter defaultPathFilter;
void dumpPath(const Path & path, Sink & sink,
PathFilter & filter = defaultPathFilter);
struct ParseSink
{
virtual void createDirectory(const Path & path) { };
virtual void createRegularFile(const Path & path) { };
virtual void isExecutable() { };
virtual void preallocateContents(unsigned long long size) { };
virtual void receiveContents(unsigned char * data, unsigned int len) { };
virtual void createSymlink(const Path & path, const string & target) { };
};
void parseDump(ParseSink & sink, Source & source);
void restorePath(const Path & path, Source & source);
}

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#include "config.h"
#include <iostream>
#include <cstring>
#ifdef HAVE_OPENSSL
#include <openssl/md5.h>
#include <openssl/sha.h>
#else
extern "C" {
#include "md5.h"
#include "sha1.h"
#include "sha256.h"
}
#endif
#include "hash.hh"
#include "archive.hh"
#include "util.hh"
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
namespace nix {
Hash::Hash()
{
type = htUnknown;
hashSize = 0;
memset(hash, 0, maxHashSize);
}
Hash::Hash(HashType type)
{
this->type = type;
if (type == htMD5) hashSize = md5HashSize;
else if (type == htSHA1) hashSize = sha1HashSize;
else if (type == htSHA256) hashSize = sha256HashSize;
else throw Error("unknown hash type");
assert(hashSize <= maxHashSize);
memset(hash, 0, maxHashSize);
}
bool Hash::operator == (const Hash & h2) const
{
if (hashSize != h2.hashSize) return false;
for (unsigned int i = 0; i < hashSize; i++)
if (hash[i] != h2.hash[i]) return false;
return true;
}
bool Hash::operator != (const Hash & h2) const
{
return !(*this == h2);
}
bool Hash::operator < (const Hash & h) const
{
for (unsigned int i = 0; i < hashSize; i++) {
if (hash[i] < h.hash[i]) return true;
if (hash[i] > h.hash[i]) return false;
}
return false;
}
const string base16Chars = "0123456789abcdef";
string printHash(const Hash & hash)
{
char buf[hash.hashSize * 2];
for (unsigned int i = 0; i < hash.hashSize; i++) {
buf[i * 2] = base16Chars[hash.hash[i] >> 4];
buf[i * 2 + 1] = base16Chars[hash.hash[i] & 0x0f];
}
return string(buf, hash.hashSize * 2);
}
Hash parseHash(HashType ht, const string & s)
{
Hash hash(ht);
if (s.length() != hash.hashSize * 2)
throw Error(format("invalid hash `%1%'") % s);
for (unsigned int i = 0; i < hash.hashSize; i++) {
string s2(s, i * 2, 2);
if (!isxdigit(s2[0]) || !isxdigit(s2[1]))
throw Error(format("invalid hash `%1%'") % s);
std::istringstream str(s2);
int n;
str >> std::hex >> n;
hash.hash[i] = n;
}
return hash;
}
static unsigned char divMod(unsigned char * bytes, unsigned char y)
{
unsigned int borrow = 0;
int pos = Hash::maxHashSize - 1;
while (pos >= 0 && !bytes[pos]) --pos;
for ( ; pos >= 0; --pos) {
unsigned int s = bytes[pos] + (borrow << 8);
unsigned int d = s / y;
borrow = s % y;
bytes[pos] = d;
}
return borrow;
}
unsigned int hashLength32(const Hash & hash)
{
return (hash.hashSize * 8 - 1) / 5 + 1;
}
// omitted: E O U T
const string base32Chars = "0123456789abcdfghijklmnpqrsvwxyz";
string printHash32(const Hash & hash)
{
Hash hash2(hash);
unsigned int len = hashLength32(hash);
const char * chars = base32Chars.data();
string s(len, '0');
int pos = len - 1;
while (pos >= 0) {
unsigned char digit = divMod(hash2.hash, 32);
s[pos--] = chars[digit];
}
for (unsigned int i = 0; i < hash2.maxHashSize; ++i)
assert(hash2.hash[i] == 0);
return s;
}
string printHash16or32(const Hash & hash)
{
return hash.type == htMD5 ? printHash(hash) : printHash32(hash);
}
static bool mul(unsigned char * bytes, unsigned char y, int maxSize)
{
unsigned char carry = 0;
for (int pos = 0; pos < maxSize; ++pos) {
unsigned int m = bytes[pos] * y + carry;
bytes[pos] = m & 0xff;
carry = m >> 8;
}
return carry;
}
static bool add(unsigned char * bytes, unsigned char y, int maxSize)
{
unsigned char carry = y;
for (int pos = 0; pos < maxSize; ++pos) {
unsigned int m = bytes[pos] + carry;
bytes[pos] = m & 0xff;
carry = m >> 8;
if (carry == 0) break;
}
return carry;
}
Hash parseHash32(HashType ht, const string & s)
{
Hash hash(ht);
const char * chars = base32Chars.data();
for (unsigned int i = 0; i < s.length(); ++i) {
char c = s[i];
unsigned char digit;
for (digit = 0; digit < base32Chars.size(); ++digit) /* !!! slow */
if (chars[digit] == c) break;
if (digit >= 32)
throw Error(format("invalid base-32 hash `%1%'") % s);
if (mul(hash.hash, 32, hash.hashSize) ||
add(hash.hash, digit, hash.hashSize))
throw Error(format("base-32 hash `%1%' is too large") % s);
}
return hash;
}
Hash parseHash16or32(HashType ht, const string & s)
{
Hash hash(ht);
if (s.size() == hash.hashSize * 2)
/* hexadecimal representation */
hash = parseHash(ht, s);
else if (s.size() == hashLength32(hash))
/* base-32 representation */
hash = parseHash32(ht, s);
else
throw Error(format("hash `%1%' has wrong length for hash type `%2%'")
% s % printHashType(ht));
return hash;
}
bool isHash(const string & s)
{
if (s.length() != 32) return false;
for (int i = 0; i < 32; i++) {
char c = s[i];
if (!((c >= '0' && c <= '9') ||
(c >= 'a' && c <= 'f')))
return false;
}
return true;
}
struct Ctx
{
MD5_CTX md5;
SHA_CTX sha1;
SHA256_CTX sha256;
};
static void start(HashType ht, Ctx & ctx)
{
if (ht == htMD5) MD5_Init(&ctx.md5);
else if (ht == htSHA1) SHA1_Init(&ctx.sha1);
else if (ht == htSHA256) SHA256_Init(&ctx.sha256);
}
static void update(HashType ht, Ctx & ctx,
const unsigned char * bytes, unsigned int len)
{
if (ht == htMD5) MD5_Update(&ctx.md5, bytes, len);
else if (ht == htSHA1) SHA1_Update(&ctx.sha1, bytes, len);
else if (ht == htSHA256) SHA256_Update(&ctx.sha256, bytes, len);
}
static void finish(HashType ht, Ctx & ctx, unsigned char * hash)
{
if (ht == htMD5) MD5_Final(hash, &ctx.md5);
else if (ht == htSHA1) SHA1_Final(hash, &ctx.sha1);
else if (ht == htSHA256) SHA256_Final(hash, &ctx.sha256);
}
Hash hashString(HashType ht, const string & s)
{
Ctx ctx;
Hash hash(ht);
start(ht, ctx);
update(ht, ctx, (const unsigned char *) s.data(), s.length());
finish(ht, ctx, hash.hash);
return hash;
}
Hash hashFile(HashType ht, const Path & path)
{
Ctx ctx;
Hash hash(ht);
start(ht, ctx);
AutoCloseFD fd = open(path.c_str(), O_RDONLY);
if (fd == -1) throw SysError(format("opening file `%1%'") % path);
unsigned char buf[8192];
ssize_t n;
while ((n = read(fd, buf, sizeof(buf)))) {
checkInterrupt();
if (n == -1) throw SysError(format("reading file `%1%'") % path);
update(ht, ctx, buf, n);
}
finish(ht, ctx, hash.hash);
return hash;
}
HashSink::HashSink(HashType ht) : ht(ht)
{
ctx = new Ctx;
bytes = 0;
start(ht, *ctx);
}
HashSink::~HashSink()
{
bufPos = 0;
delete ctx;
}
void HashSink::write(const unsigned char * data, size_t len)
{
bytes += len;
update(ht, *ctx, data, len);
}
HashResult HashSink::finish()
{
flush();
Hash hash(ht);
nix::finish(ht, *ctx, hash.hash);
return HashResult(hash, bytes);
}
HashResult HashSink::currentHash()
{
flush();
Ctx ctx2 = *ctx;
Hash hash(ht);
nix::finish(ht, ctx2, hash.hash);
return HashResult(hash, bytes);
}
HashResult hashPath(
HashType ht, const Path & path, PathFilter & filter)
{
HashSink sink(ht);
dumpPath(path, sink, filter);
return sink.finish();
}
Hash compressHash(const Hash & hash, unsigned int newSize)
{
Hash h;
h.hashSize = newSize;
for (unsigned int i = 0; i < hash.hashSize; ++i)
h.hash[i % newSize] ^= hash.hash[i];
return h;
}
HashType parseHashType(const string & s)
{
if (s == "md5") return htMD5;
else if (s == "sha1") return htSHA1;
else if (s == "sha256") return htSHA256;
else return htUnknown;
}
string printHashType(HashType ht)
{
if (ht == htMD5) return "md5";
else if (ht == htSHA1) return "sha1";
else if (ht == htSHA256) return "sha256";
else throw Error("cannot print unknown hash type");
}
}

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#pragma once
#include "types.hh"
#include "serialise.hh"
namespace nix {
typedef enum { htUnknown, htMD5, htSHA1, htSHA256 } HashType;
const int md5HashSize = 16;
const int sha1HashSize = 20;
const int sha256HashSize = 32;
extern const string base32Chars;
struct Hash
{
static const unsigned int maxHashSize = 32;
unsigned int hashSize;
unsigned char hash[maxHashSize];
HashType type;
/* Create an unusable hash object. */
Hash();
/* Create a zero-filled hash object. */
Hash(HashType type);
/* Check whether two hash are equal. */
bool operator == (const Hash & h2) const;
/* Check whether two hash are not equal. */
bool operator != (const Hash & h2) const;
/* For sorting. */
bool operator < (const Hash & h) const;
};
/* Convert a hash to a hexadecimal representation. */
string printHash(const Hash & hash);
/* Parse a hexadecimal representation of a hash code. */
Hash parseHash(HashType ht, const string & s);
/* Returns the length of a base-32 hash representation. */
unsigned int hashLength32(const Hash & hash);
/* Convert a hash to a base-32 representation. */
string printHash32(const Hash & hash);
/* Print a hash in base-16 if it's MD5, or base-32 otherwise. */
string printHash16or32(const Hash & hash);
/* Parse a base-32 representation of a hash code. */
Hash parseHash32(HashType ht, const string & s);
/* Parse a base-16 or base-32 representation of a hash code. */
Hash parseHash16or32(HashType ht, const string & s);
/* Verify that the given string is a valid hash code. */
bool isHash(const string & s);
/* Compute the hash of the given string. */
Hash hashString(HashType ht, const string & s);
/* Compute the hash of the given file. */
Hash hashFile(HashType ht, const Path & path);
/* Compute the hash of the given path. The hash is defined as
(essentially) hashString(ht, dumpPath(path)). */
struct PathFilter;
extern PathFilter defaultPathFilter;
typedef std::pair<Hash, unsigned long long> HashResult;
HashResult hashPath(HashType ht, const Path & path,
PathFilter & filter = defaultPathFilter);
/* Compress a hash to the specified number of bytes by cyclically
XORing bytes together. */
Hash compressHash(const Hash & hash, unsigned int newSize);
/* Parse a string representing a hash type. */
HashType parseHashType(const string & s);
/* And the reverse. */
string printHashType(HashType ht);
struct Ctx;
class HashSink : public BufferedSink
{
private:
HashType ht;
Ctx * ctx;
unsigned long long bytes;
public:
HashSink(HashType ht);
HashSink(const HashSink & h);
~HashSink();
void write(const unsigned char * data, size_t len);
HashResult finish();
HashResult currentHash();
};
}

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#include "serialise.hh"
#include "util.hh"
#include <cstring>
#include <cerrno>
namespace nix {
BufferedSink::~BufferedSink()
{
/* We can't call flush() here, because C++ for some insane reason
doesn't allow you to call virtual methods from a destructor. */
assert(!bufPos);
delete[] buffer;
}
void BufferedSink::operator () (const unsigned char * data, size_t len)
{
if (!buffer) buffer = new unsigned char[bufSize];
while (len) {
/* Optimisation: bypass the buffer if the data exceeds the
buffer size. */
if (bufPos + len >= bufSize) {
flush();
write(data, len);
break;
}
/* Otherwise, copy the bytes to the buffer. Flush the buffer
when it's full. */
size_t n = bufPos + len > bufSize ? bufSize - bufPos : len;
memcpy(buffer + bufPos, data, n);
data += n; bufPos += n; len -= n;
if (bufPos == bufSize) flush();
}
}
void BufferedSink::flush()
{
if (bufPos == 0) return;
size_t n = bufPos;
bufPos = 0; // don't trigger the assert() in ~BufferedSink()
write(buffer, n);
}
FdSink::~FdSink()
{
try { flush(); } catch (...) { ignoreException(); }
}
void FdSink::write(const unsigned char * data, size_t len)
{
writeFull(fd, data, len);
}
void Source::operator () (unsigned char * data, size_t len)
{
while (len) {
size_t n = read(data, len);
data += n; len -= n;
}
}
BufferedSource::~BufferedSource()
{
delete[] buffer;
}
size_t BufferedSource::read(unsigned char * data, size_t len)
{
if (!buffer) buffer = new unsigned char[bufSize];
if (!bufPosIn) bufPosIn = readUnbuffered(buffer, bufSize);
/* Copy out the data in the buffer. */
size_t n = len > bufPosIn - bufPosOut ? bufPosIn - bufPosOut : len;
memcpy(data, buffer + bufPosOut, n);
bufPosOut += n;
if (bufPosIn == bufPosOut) bufPosIn = bufPosOut = 0;
return n;
}
bool BufferedSource::hasData()
{
return bufPosOut < bufPosIn;
}
size_t FdSource::readUnbuffered(unsigned char * data, size_t len)
{
ssize_t n;
do {
checkInterrupt();
n = ::read(fd, (char *) data, bufSize);
} while (n == -1 && errno == EINTR);
if (n == -1) throw SysError("reading from file");
if (n == 0) throw EndOfFile("unexpected end-of-file");
return n;
}
size_t StringSource::read(unsigned char * data, size_t len)
{
if (pos == s.size()) throw EndOfFile("end of string reached");
size_t n = s.copy((char *) data, len, pos);
pos += n;
return n;
}
void writePadding(size_t len, Sink & sink)
{
if (len % 8) {
unsigned char zero[8];
memset(zero, 0, sizeof(zero));
sink(zero, 8 - (len % 8));
}
}
void writeInt(unsigned int n, Sink & sink)
{
unsigned char buf[8];
memset(buf, 0, sizeof(buf));
buf[0] = n & 0xff;
buf[1] = (n >> 8) & 0xff;
buf[2] = (n >> 16) & 0xff;
buf[3] = (n >> 24) & 0xff;
sink(buf, sizeof(buf));
}
void writeLongLong(unsigned long long n, Sink & sink)
{
unsigned char buf[8];
buf[0] = n & 0xff;
buf[1] = (n >> 8) & 0xff;
buf[2] = (n >> 16) & 0xff;
buf[3] = (n >> 24) & 0xff;
buf[4] = (n >> 32) & 0xff;
buf[5] = (n >> 40) & 0xff;
buf[6] = (n >> 48) & 0xff;
buf[7] = (n >> 56) & 0xff;
sink(buf, sizeof(buf));
}
void writeString(const unsigned char * buf, size_t len, Sink & sink)
{
writeInt(len, sink);
sink(buf, len);
writePadding(len, sink);
}
void writeString(const string & s, Sink & sink)
{
writeString((const unsigned char *) s.data(), s.size(), sink);
}
template<class T> void writeStrings(const T & ss, Sink & sink)
{
writeInt(ss.size(), sink);
foreach (typename T::const_iterator, i, ss)
writeString(*i, sink);
}
template void writeStrings(const Paths & ss, Sink & sink);
template void writeStrings(const PathSet & ss, Sink & sink);
void readPadding(size_t len, Source & source)
{
if (len % 8) {
unsigned char zero[8];
size_t n = 8 - (len % 8);
source(zero, n);
for (unsigned int i = 0; i < n; i++)
if (zero[i]) throw SerialisationError("non-zero padding");
}
}
unsigned int readInt(Source & source)
{
unsigned char buf[8];
source(buf, sizeof(buf));
if (buf[4] || buf[5] || buf[6] || buf[7])
throw SerialisationError("implementation cannot deal with > 32-bit integers");
return
buf[0] |
(buf[1] << 8) |
(buf[2] << 16) |
(buf[3] << 24);
}
unsigned long long readLongLong(Source & source)
{
unsigned char buf[8];
source(buf, sizeof(buf));
return
((unsigned long long) buf[0]) |
((unsigned long long) buf[1] << 8) |
((unsigned long long) buf[2] << 16) |
((unsigned long long) buf[3] << 24) |
((unsigned long long) buf[4] << 32) |
((unsigned long long) buf[5] << 40) |
((unsigned long long) buf[6] << 48) |
((unsigned long long) buf[7] << 56);
}
size_t readString(unsigned char * buf, size_t max, Source & source)
{
size_t len = readInt(source);
if (len > max) throw Error("string is too long");
source(buf, len);
readPadding(len, source);
return len;
}
string readString(Source & source)
{
size_t len = readInt(source);
unsigned char * buf = new unsigned char[len];
AutoDeleteArray<unsigned char> d(buf);
source(buf, len);
readPadding(len, source);
return string((char *) buf, len);
}
template<class T> T readStrings(Source & source)
{
unsigned int count = readInt(source);
T ss;
while (count--)
ss.insert(ss.end(), readString(source));
return ss;
}
template Paths readStrings(Source & source);
template PathSet readStrings(Source & source);
}

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#pragma once
#include "types.hh"
namespace nix {
/* Abstract destination of binary data. */
struct Sink
{
virtual ~Sink() { }
virtual void operator () (const unsigned char * data, size_t len) = 0;
};
/* A buffered abstract sink. */
struct BufferedSink : Sink
{
size_t bufSize, bufPos;
unsigned char * buffer;
BufferedSink(size_t bufSize = 32 * 1024)
: bufSize(bufSize), bufPos(0), buffer(0) { }
~BufferedSink();
void operator () (const unsigned char * data, size_t len);
void flush();
virtual void write(const unsigned char * data, size_t len) = 0;
};
/* Abstract source of binary data. */
struct Source
{
virtual ~Source() { }
/* Store exactly ‘len’ bytes in the buffer pointed to by ‘data’.
It blocks until all the requested data is available, or throws
an error if it is not going to be available. */
void operator () (unsigned char * data, size_t len);
/* Store up to ‘len’ in the buffer pointed to by ‘data’, and
return the number of bytes stored. If blocks until at least
one byte is available. */
virtual size_t read(unsigned char * data, size_t len) = 0;
};
/* A buffered abstract source. */
struct BufferedSource : Source
{
size_t bufSize, bufPosIn, bufPosOut;
unsigned char * buffer;
BufferedSource(size_t bufSize = 32 * 1024)
: bufSize(bufSize), bufPosIn(0), bufPosOut(0), buffer(0) { }
~BufferedSource();
size_t read(unsigned char * data, size_t len);
/* Underlying read call, to be overridden. */
virtual size_t readUnbuffered(unsigned char * data, size_t len) = 0;
bool hasData();
};
/* A sink that writes data to a file descriptor. */
struct FdSink : BufferedSink
{
int fd;
FdSink() : fd(-1) { }
FdSink(int fd) : fd(fd) { }
~FdSink();
void write(const unsigned char * data, size_t len);
};
/* A source that reads data from a file descriptor. */
struct FdSource : BufferedSource
{
int fd;
FdSource() : fd(-1) { }
FdSource(int fd) : fd(fd) { }
size_t readUnbuffered(unsigned char * data, size_t len);
};
/* A sink that writes data to a string. */
struct StringSink : Sink
{
string s;
void operator () (const unsigned char * data, size_t len)
{
s.append((const char *) data, len);
}
};
/* A source that reads data from a string. */
struct StringSource : Source
{
const string & s;
size_t pos;
StringSource(const string & _s) : s(_s), pos(0) { }
size_t read(unsigned char * data, size_t len);
};
void writePadding(size_t len, Sink & sink);
void writeInt(unsigned int n, Sink & sink);
void writeLongLong(unsigned long long n, Sink & sink);
void writeString(const unsigned char * buf, size_t len, Sink & sink);
void writeString(const string & s, Sink & sink);
template<class T> void writeStrings(const T & ss, Sink & sink);
void readPadding(size_t len, Source & source);
unsigned int readInt(Source & source);
unsigned long long readLongLong(Source & source);
size_t readString(unsigned char * buf, size_t max, Source & source);
string readString(Source & source);
template<class T> T readStrings(Source & source);
MakeError(SerialisationError, Error)
}

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#pragma once
#include "config.h"
#include <string>
#include <list>
#include <set>
#include <boost/format.hpp>
namespace nix {
/* Inherit some names from other namespaces for convenience. */
using std::string;
using std::list;
using std::set;
using std::vector;
using boost::format;
struct FormatOrString
{
string s;
FormatOrString(const string & s) : s(s) { };
FormatOrString(const format & f) : s(f.str()) { };
FormatOrString(const char * s) : s(s) { };
};
/* BaseError should generally not be caught, as it has Interrupted as
a subclass. Catch Error instead. */
class BaseError : public std::exception
{
protected:
string prefix_; // used for location traces etc.
string err;
public:
unsigned int status; // exit status
BaseError(const FormatOrString & fs, unsigned int status = 1);
~BaseError() throw () { };
const char * what() const throw () { return err.c_str(); }
const string & msg() const throw () { return err; }
const string & prefix() const throw () { return prefix_; }
BaseError & addPrefix(const FormatOrString & fs);
};
#define MakeError(newClass, superClass) \
class newClass : public superClass \
{ \
public: \
newClass(const FormatOrString & fs, unsigned int status = 1) : superClass(fs, status) { }; \
};
MakeError(Error, BaseError)
class SysError : public Error
{
public:
int errNo;
SysError(const FormatOrString & fs);
};
typedef list<string> Strings;
typedef set<string> StringSet;
/* Paths are just strings. */
typedef string Path;
typedef list<Path> Paths;
typedef set<Path> PathSet;
typedef enum {
lvlError = 0,
lvlInfo,
lvlTalkative,
lvlChatty,
lvlDebug,
lvlVomit
} Verbosity;
}

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#pragma once
#include "types.hh"
#include <sys/types.h>
#include <sys/stat.h>
#include <dirent.h>
#include <unistd.h>
#include <signal.h>
#include <cstdio>
namespace nix {
#define foreach(it_type, it, collection) \
for (it_type it = (collection).begin(); it != (collection).end(); ++it)
#define foreach_reverse(it_type, it, collection) \
for (it_type it = (collection).rbegin(); it != (collection).rend(); ++it)
/* Return an environment variable. */
string getEnv(const string & key, const string & def = "");
/* Return an absolutized path, resolving paths relative to the
specified directory, or the current directory otherwise. The path
is also canonicalised. */
Path absPath(Path path, Path dir = "");
/* Canonicalise a path by removing all `.' or `..' components and
double or trailing slashes. Optionally resolves all symlink
components such that each component of the resulting path is *not*
a symbolic link. */
Path canonPath(const Path & path, bool resolveSymlinks = false);
/* Return the directory part of the given canonical path, i.e.,
everything before the final `/'. If the path is the root or an
immediate child thereof (e.g., `/foo'), this means an empty string
is returned. */
Path dirOf(const Path & path);
/* Return the base name of the given canonical path, i.e., everything
following the final `/'. */
string baseNameOf(const Path & path);
/* Check whether a given path is a descendant of the given
directory. */
bool isInDir(const Path & path, const Path & dir);
/* Get status of `path'. */
struct stat lstat(const Path & path);
/* Return true iff the given path exists. */
bool pathExists(const Path & path);
/* Read the contents (target) of a symbolic link. The result is not
in any way canonicalised. */
Path readLink(const Path & path);
bool isLink(const Path & path);
/* Read the contents of a directory. The entries `.' and `..' are
removed. */
Strings readDirectory(const Path & path);
/* Read the contents of a file into a string. */
string readFile(int fd);
string readFile(const Path & path, bool drain = false);
/* Write a string to a file. */
void writeFile(const Path & path, const string & s);
/* Read a line from a file descriptor. */
string readLine(int fd);
/* Write a line to a file descriptor. */
void writeLine(int fd, string s);
/* Delete a path; i.e., in the case of a directory, it is deleted
recursively. Don't use this at home, kids. The second variant
returns the number of bytes and blocks freed. */
void deletePath(const Path & path);
void deletePath(const Path & path, unsigned long long & bytesFreed);
/* Create a temporary directory. */
Path createTempDir(const Path & tmpRoot = "", const Path & prefix = "nix",
bool includePid = true, bool useGlobalCounter = true, mode_t mode = 0755);
/* Create a directory and all its parents, if necessary. Returns the
list of created directories, in order of creation. */
Paths createDirs(const Path & path);
/* Create a symlink. */
void createSymlink(const Path & target, const Path & link);
template<class T, class A>
T singleton(const A & a)
{
T t;
t.insert(a);
return t;
}
/* Messages. */
typedef enum {
ltPretty, /* nice, nested output */
ltEscapes, /* nesting indicated using escape codes (for log2xml) */
ltFlat /* no nesting */
} LogType;
extern LogType logType;
extern Verbosity verbosity; /* suppress msgs > this */
class Nest
{
private:
bool nest;
public:
Nest();
~Nest();
void open(Verbosity level, const FormatOrString & fs);
void close();
};
void printMsg_(Verbosity level, const FormatOrString & fs);
#define startNest(varName, level, f) \
Nest varName; \
if (level <= verbosity) { \
varName.open(level, (f)); \
}
#define printMsg(level, f) \
do { \
if (level <= verbosity) { \
printMsg_(level, (f)); \
} \
} while (0)
#define debug(f) printMsg(lvlDebug, f)
void warnOnce(bool & haveWarned, const FormatOrString & fs);
void writeToStderr(const string & s);
extern void (*_writeToStderr) (const unsigned char * buf, size_t count);
/* Wrappers arount read()/write() that read/write exactly the
requested number of bytes. */
void readFull(int fd, unsigned char * buf, size_t count);
void writeFull(int fd, const unsigned char * buf, size_t count);
MakeError(EndOfFile, Error)
/* Read a file descriptor until EOF occurs. */
string drainFD(int fd);
/* Automatic cleanup of resources. */
template <class T>
struct AutoDeleteArray
{
T * p;
AutoDeleteArray(T * p) : p(p) { }
~AutoDeleteArray()
{
delete [] p;
}
};
class AutoDelete
{
Path path;
bool del;
bool recursive;
public:
AutoDelete(const Path & p, bool recursive = true);
~AutoDelete();
void cancel();
};
class AutoCloseFD
{
int fd;
public:
AutoCloseFD();
AutoCloseFD(int fd);
AutoCloseFD(const AutoCloseFD & fd);
~AutoCloseFD();
void operator =(int fd);
operator int() const;
void close();
bool isOpen();
int borrow();
};
class Pipe
{
public:
AutoCloseFD readSide, writeSide;
void create();
};
class AutoCloseDir
{
DIR * dir;
public:
AutoCloseDir();
AutoCloseDir(DIR * dir);
~AutoCloseDir();
void operator =(DIR * dir);
operator DIR *();
void close();
};
class Pid
{
pid_t pid;
bool separatePG;
int killSignal;
public:
Pid();
~Pid();
void operator =(pid_t pid);
operator pid_t();
void kill();
int wait(bool block);
void setSeparatePG(bool separatePG);
void setKillSignal(int signal);
};
/* Kill all processes running under the specified uid by sending them
a SIGKILL. */
void killUser(uid_t uid);
/* Run a program and return its stdout in a string (i.e., like the
shell backtick operator). */
string runProgram(Path program, bool searchPath = false,
const Strings & args = Strings());
/* Close all file descriptors except stdin, stdout, stderr, and those
listed in the given set. Good practice in child processes. */
void closeMostFDs(const set<int> & exceptions);
/* Set the close-on-exec flag for the given file descriptor. */
void closeOnExec(int fd);
/* Call vfork() if available, otherwise fork(). */
extern pid_t (*maybeVfork)();
/* User interruption. */
extern volatile sig_atomic_t _isInterrupted;
void _interrupted();
void inline checkInterrupt()
{
if (_isInterrupted) _interrupted();
}
MakeError(Interrupted, BaseError)
/* String tokenizer. */
template<class C> C tokenizeString(const string & s, const string & separators = " \t\n\r");
/* Concatenate the given strings with a separator between the
elements. */
string concatStringsSep(const string & sep, const Strings & ss);
string concatStringsSep(const string & sep, const StringSet & ss);
/* Remove trailing whitespace from a string. */
string chomp(const string & s);
/* Convert the exit status of a child as returned by wait() into an
error string. */
string statusToString(int status);
bool statusOk(int status);
/* Parse a string into an integer. */
template<class N> bool string2Int(const string & s, N & n)
{
std::istringstream str(s);
str >> n;
return str && str.get() == EOF;
}
template<class N> string int2String(N n)
{
std::ostringstream str;
str << n;
return str.str();
}
/* Return true iff `s' ends in `suffix'. */
bool hasSuffix(const string & s, const string & suffix);
/* Read string `s' from stream `str'. */
void expect(std::istream & str, const string & s);
/* Read a C-style string from stream `str'. */
string parseString(std::istream & str);
/* Utility function used to parse legacy ATerms. */
bool endOfList(std::istream & str);
/* Escape a string that contains octal-encoded escape codes such as
used in /etc/fstab and /proc/mounts (e.g. "foo\040bar" decodes to
"foo bar"). */
string decodeOctalEscaped(const string & s);
/* Exception handling in destructors: print an error message, then
ignore the exception. */
void ignoreException();
}

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#include <assert.h>
#include "xml-writer.hh"
namespace nix {
XMLWriter::XMLWriter(bool indent, std::ostream & output)
: output(output), indent(indent)
{
output << "<?xml version='1.0' encoding='utf-8'?>" << std::endl;
closed = false;
}
XMLWriter::~XMLWriter()
{
close();
}
void XMLWriter::close()
{
if (closed) return;
while (!pendingElems.empty()) closeElement();
closed = true;
}
void XMLWriter::indent_(unsigned int depth)
{
if (!indent) return;
output << string(depth * 2, ' ');
}
void XMLWriter::openElement(const string & name,
const XMLAttrs & attrs)
{
assert(!closed);
indent_(pendingElems.size());
output << "<" << name;
writeAttrs(attrs);
output << ">";
if (indent) output << std::endl;
pendingElems.push_back(name);
}
void XMLWriter::closeElement()
{
assert(!pendingElems.empty());
indent_(pendingElems.size() - 1);
output << "</" << pendingElems.back() << ">";
if (indent) output << std::endl;
pendingElems.pop_back();
if (pendingElems.empty()) closed = true;
}
void XMLWriter::writeEmptyElement(const string & name,
const XMLAttrs & attrs)
{
assert(!closed);
indent_(pendingElems.size());
output << "<" << name;
writeAttrs(attrs);
output << " />";
if (indent) output << std::endl;
}
void XMLWriter::writeAttrs(const XMLAttrs & attrs)
{
for (XMLAttrs::const_iterator i = attrs.begin(); i != attrs.end(); ++i) {
output << " " << i->first << "=\"";
for (unsigned int j = 0; j < i->second.size(); ++j) {
char c = i->second[j];
if (c == '"') output << "&quot;";
else if (c == '<') output << "&lt;";
else if (c == '>') output << "&gt;";
else if (c == '&') output << "&amp;";
/* Escape newlines to prevent attribute normalisation (see
XML spec, section 3.3.3. */
else if (c == '\n') output << "&#xA;";
else output << c;
}
output << "\"";
}
}
}

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#pragma once
#include <iostream>
#include <string>
#include <list>
#include <map>
namespace nix {
using std::string;
using std::map;
using std::list;
typedef map<string, string> XMLAttrs;
class XMLWriter
{
private:
std::ostream & output;
bool indent;
bool closed;
list<string> pendingElems;
public:
XMLWriter(bool indent, std::ostream & output);
~XMLWriter();
void close();
void openElement(const string & name,
const XMLAttrs & attrs = XMLAttrs());
void closeElement();
void writeEmptyElement(const string & name,
const XMLAttrs & attrs = XMLAttrs());
private:
void writeAttrs(const XMLAttrs & attrs);
void indent_(unsigned int depth);
};
class XMLOpenElement
{
private:
XMLWriter & writer;
public:
XMLOpenElement(XMLWriter & writer, const string & name,
const XMLAttrs & attrs = XMLAttrs())
: writer(writer)
{
writer.openElement(name, attrs);
}
~XMLOpenElement()
{
writer.closeElement();
}
};
}

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#include "shared.hh"
#include "local-store.hh"
#include "util.hh"
#include "serialise.hh"
#include "worker-protocol.hh"
#include "archive.hh"
#include "affinity.hh"
#include "globals.hh"
#include <cstring>
#include <unistd.h>
#include <signal.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <sys/stat.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <fcntl.h>
#include <errno.h>
using namespace nix;
/* On platforms that have O_ASYNC, we can detect when a client
disconnects and immediately kill any ongoing builds. On platforms
that lack it, we only notice the disconnection the next time we try
to write to the client. So if you have a builder that never
generates output on stdout/stderr, the daemon will never notice
that the client has disconnected until the builder terminates.
GNU/Hurd does have O_ASYNC, but its Unix-domain socket translator
(pflocal) does not implement F_SETOWN. See
<http://lists.gnu.org/archive/html/bug-guix/2013-07/msg00021.html> for
details.*/
#if defined O_ASYNC && !defined __GNU__
#define HAVE_HUP_NOTIFICATION
#ifndef SIGPOLL
#define SIGPOLL SIGIO
#endif
#endif
static FdSource from(STDIN_FILENO);
static FdSink to(STDOUT_FILENO);
bool canSendStderr;
pid_t myPid;
/* This function is called anytime we want to write something to
stderr. If we're in a state where the protocol allows it (i.e.,
when canSendStderr), send the message to the client over the
socket. */
static void tunnelStderr(const unsigned char * buf, size_t count)
{
/* Don't send the message to the client if we're a child of the
process handling the connection. Otherwise we could screw up
the protocol. It's up to the parent to redirect stderr and
send it to the client somehow (e.g., as in build.cc). */
if (canSendStderr && myPid == getpid()) {
try {
writeInt(STDERR_NEXT, to);
writeString(buf, count, to);
to.flush();
} catch (...) {
/* Write failed; that means that the other side is
gone. */
canSendStderr = false;
throw;
}
} else
writeFull(STDERR_FILENO, buf, count);
}
/* Return true if the remote side has closed its end of the
connection, false otherwise. Should not be called on any socket on
which we expect input! */
static bool isFarSideClosed(int socket)
{
struct timeval timeout;
timeout.tv_sec = timeout.tv_usec = 0;
fd_set fds;
FD_ZERO(&fds);
FD_SET(socket, &fds);
while (select(socket + 1, &fds, 0, 0, &timeout) == -1)
if (errno != EINTR) throw SysError("select()");
if (!FD_ISSET(socket, &fds)) return false;
/* Destructive read to determine whether the select() marked the
socket as readable because there is actual input or because
we've reached EOF (i.e., a read of size 0 is available). */
char c;
int rd;
if ((rd = read(socket, &c, 1)) > 0)
throw Error("EOF expected (protocol error?)");
else if (rd == -1 && errno != ECONNRESET)
throw SysError("expected connection reset or EOF");
return true;
}
/* A SIGPOLL signal is received when data is available on the client
communication socket, or when the client has closed its side of the
socket. This handler is enabled at precisely those moments in the
protocol when we're doing work and the client is supposed to be
quiet. Thus, if we get a SIGPOLL signal, it means that the client
has quit. So we should quit as well.
Too bad most operating systems don't support the POLL_HUP value for
si_code in siginfo_t. That would make most of the SIGPOLL
complexity unnecessary, i.e., we could just enable SIGPOLL all the
time and wouldn't have to worry about races. */
static void sigPollHandler(int sigNo)
{
using namespace std;
try {
/* Check that the far side actually closed. We're still
getting spurious signals every once in a while. I.e.,
there is no input available, but we get a signal with
POLL_IN set. Maybe it's delayed or something. */
if (isFarSideClosed(from.fd)) {
if (!blockInt) {
_isInterrupted = 1;
blockInt = 1;
canSendStderr = false;
const char * s = "SIGPOLL\n";
write(STDERR_FILENO, s, strlen(s));
}
} else {
const char * s = "spurious SIGPOLL\n";
write(STDERR_FILENO, s, strlen(s));
}
}
catch (Error & e) {
/* Shouldn't happen. */
string s = "impossible: " + e.msg() + '\n';
write(STDERR_FILENO, s.data(), s.size());
throw;
}
}
static void setSigPollAction(bool enable)
{
#ifdef HAVE_HUP_NOTIFICATION
struct sigaction act, oact;
act.sa_handler = enable ? sigPollHandler : SIG_IGN;
sigfillset(&act.sa_mask);
act.sa_flags = 0;
if (sigaction(SIGPOLL, &act, &oact))
throw SysError("setting handler for SIGPOLL");
#endif
}
/* startWork() means that we're starting an operation for which we
want to send out stderr to the client. */
static void startWork()
{
canSendStderr = true;
/* Handle client death asynchronously. */
setSigPollAction(true);
/* Of course, there is a race condition here: the socket could
have closed between when we last read from / wrote to it, and
between the time we set the handler for SIGPOLL. In that case
we won't get the signal. So do a non-blocking select() to find
out if any input is available on the socket. If there is, it
has to be the 0-byte read that indicates that the socket has
closed. */
if (isFarSideClosed(from.fd)) {
_isInterrupted = 1;
checkInterrupt();
}
}
/* stopWork() means that we're done; stop sending stderr to the
client. */
static void stopWork(bool success = true, const string & msg = "", unsigned int status = 0)
{
/* Stop handling async client death; we're going to a state where
we're either sending or receiving from the client, so we'll be
notified of client death anyway. */
setSigPollAction(false);
canSendStderr = false;
if (success)
writeInt(STDERR_LAST, to);
else {
writeInt(STDERR_ERROR, to);
writeString(msg, to);
if (status != 0) writeInt(status, to);
}
}
struct TunnelSink : Sink
{
Sink & to;
TunnelSink(Sink & to) : to(to) { }
virtual void operator () (const unsigned char * data, size_t len)
{
writeInt(STDERR_WRITE, to);
writeString(data, len, to);
}
};
struct TunnelSource : BufferedSource
{
Source & from;
TunnelSource(Source & from) : from(from) { }
size_t readUnbuffered(unsigned char * data, size_t len)
{
/* Careful: we're going to receive data from the client now,
so we have to disable the SIGPOLL handler. */
setSigPollAction(false);
canSendStderr = false;
writeInt(STDERR_READ, to);
writeInt(len, to);
to.flush();
size_t n = readString(data, len, from);
startWork();
if (n == 0) throw EndOfFile("unexpected end-of-file");
return n;
}
};
/* If the NAR archive contains a single file at top-level, then save
the contents of the file to `s'. Otherwise barf. */
struct RetrieveRegularNARSink : ParseSink
{
bool regular;
string s;
RetrieveRegularNARSink() : regular(true) { }
void createDirectory(const Path & path)
{
regular = false;
}
void receiveContents(unsigned char * data, unsigned int len)
{
s.append((const char *) data, len);
}
void createSymlink(const Path & path, const string & target)
{
regular = false;
}
};
/* Adapter class of a Source that saves all data read to `s'. */
struct SavingSourceAdapter : Source
{
Source & orig;
string s;
SavingSourceAdapter(Source & orig) : orig(orig) { }
size_t read(unsigned char * data, size_t len)
{
size_t n = orig.read(data, len);
s.append((const char *) data, n);
return n;
}
};
static void performOp(bool trusted, unsigned int clientVersion,
Source & from, Sink & to, unsigned int op)
{
switch (op) {
#if 0
case wopQuit: {
/* Close the database. */
store.reset((StoreAPI *) 0);
writeInt(1, to);
break;
}
#endif
case wopIsValidPath: {
/* 'readStorePath' could raise an error leading to the connection
being closed. To be able to recover from an invalid path error,
call 'startWork' early, and do 'assertStorePath' afterwards so
that the 'Error' exception handler doesn't close the
connection. */
Path path = readString(from);
startWork();
assertStorePath(path);
bool result = store->isValidPath(path);
stopWork();
writeInt(result, to);
break;
}
case wopQueryValidPaths: {
PathSet paths = readStorePaths<PathSet>(from);
startWork();
PathSet res = store->queryValidPaths(paths);
stopWork();
writeStrings(res, to);
break;
}
case wopHasSubstitutes: {
Path path = readStorePath(from);
startWork();
PathSet res = store->querySubstitutablePaths(singleton<PathSet>(path));
stopWork();
writeInt(res.find(path) != res.end(), to);
break;
}
case wopQuerySubstitutablePaths: {
PathSet paths = readStorePaths<PathSet>(from);
startWork();
PathSet res = store->querySubstitutablePaths(paths);
stopWork();
writeStrings(res, to);
break;
}
case wopQueryPathHash: {
Path path = readStorePath(from);
startWork();
Hash hash = store->queryPathHash(path);
stopWork();
writeString(printHash(hash), to);
break;
}
case wopQueryReferences:
case wopQueryReferrers:
case wopQueryValidDerivers:
case wopQueryDerivationOutputs: {
Path path = readStorePath(from);
startWork();
PathSet paths;
if (op == wopQueryReferences)
store->queryReferences(path, paths);
else if (op == wopQueryReferrers)
store->queryReferrers(path, paths);
else if (op == wopQueryValidDerivers)
paths = store->queryValidDerivers(path);
else paths = store->queryDerivationOutputs(path);
stopWork();
writeStrings(paths, to);
break;
}
case wopQueryDerivationOutputNames: {
Path path = readStorePath(from);
startWork();
StringSet names;
names = store->queryDerivationOutputNames(path);
stopWork();
writeStrings(names, to);
break;
}
case wopQueryDeriver: {
Path path = readStorePath(from);
startWork();
Path deriver = store->queryDeriver(path);
stopWork();
writeString(deriver, to);
break;
}
case wopQueryPathFromHashPart: {
string hashPart = readString(from);
startWork();
Path path = store->queryPathFromHashPart(hashPart);
stopWork();
writeString(path, to);
break;
}
case wopAddToStore: {
string baseName = readString(from);
bool fixed = readInt(from) == 1; /* obsolete */
bool recursive = readInt(from) == 1;
string s = readString(from);
/* Compatibility hack. */
if (!fixed) {
s = "sha256";
recursive = true;
}
HashType hashAlgo = parseHashType(s);
SavingSourceAdapter savedNAR(from);
RetrieveRegularNARSink savedRegular;
if (recursive) {
/* Get the entire NAR dump from the client and save it to
a string so that we can pass it to
addToStoreFromDump(). */
ParseSink sink; /* null sink; just parse the NAR */
parseDump(sink, savedNAR);
} else
parseDump(savedRegular, from);
startWork();
if (!savedRegular.regular) throw Error("regular file expected");
Path path = dynamic_cast<LocalStore *>(store.get())
->addToStoreFromDump(recursive ? savedNAR.s : savedRegular.s, baseName, recursive, hashAlgo);
stopWork();
writeString(path, to);
break;
}
case wopAddTextToStore: {
string suffix = readString(from);
string s = readString(from);
PathSet refs = readStorePaths<PathSet>(from);
startWork();
Path path = store->addTextToStore(suffix, s, refs);
stopWork();
writeString(path, to);
break;
}
case wopExportPath: {
Path path = readStorePath(from);
bool sign = readInt(from) == 1;
startWork();
TunnelSink sink(to);
store->exportPath(path, sign, sink);
stopWork();
writeInt(1, to);
break;
}
case wopImportPaths: {
startWork();
TunnelSource source(from);
Paths paths = store->importPaths(true, source);
stopWork();
writeStrings(paths, to);
break;
}
case wopBuildPaths: {
PathSet drvs = readStorePaths<PathSet>(from);
startWork();
store->buildPaths(drvs);
stopWork();
writeInt(1, to);
break;
}
case wopEnsurePath: {
Path path = readStorePath(from);
startWork();
store->ensurePath(path);
stopWork();
writeInt(1, to);
break;
}
case wopAddTempRoot: {
Path path = readStorePath(from);
startWork();
store->addTempRoot(path);
stopWork();
writeInt(1, to);
break;
}
case wopAddIndirectRoot: {
Path path = absPath(readString(from));
startWork();
store->addIndirectRoot(path);
stopWork();
writeInt(1, to);
break;
}
case wopSyncWithGC: {
startWork();
store->syncWithGC();
stopWork();
writeInt(1, to);
break;
}
case wopFindRoots: {
startWork();
Roots roots = store->findRoots();
stopWork();
writeInt(roots.size(), to);
for (Roots::iterator i = roots.begin(); i != roots.end(); ++i) {
writeString(i->first, to);
writeString(i->second, to);
}
break;
}
case wopCollectGarbage: {
GCOptions options;
options.action = (GCOptions::GCAction) readInt(from);
options.pathsToDelete = readStorePaths<PathSet>(from);
options.ignoreLiveness = readInt(from);
options.maxFreed = readLongLong(from);
readInt(from); // obsolete field
if (GET_PROTOCOL_MINOR(clientVersion) >= 5) {
/* removed options */
readInt(from);
readInt(from);
}
GCResults results;
startWork();
if (options.ignoreLiveness)
throw Error("you are not allowed to ignore liveness");
store->collectGarbage(options, results);
stopWork();
writeStrings(results.paths, to);
writeLongLong(results.bytesFreed, to);
writeLongLong(0, to); // obsolete
break;
}
case wopSetOptions: {
settings.keepFailed = readInt(from) != 0;
settings.keepGoing = readInt(from) != 0;
settings.set("build-fallback", readInt(from) ? "true" : "false");
verbosity = (Verbosity) readInt(from);
settings.set("build-max-jobs", int2String(readInt(from)));
settings.set("build-max-silent-time", int2String(readInt(from)));
if (GET_PROTOCOL_MINOR(clientVersion) >= 2)
settings.useBuildHook = readInt(from) != 0;
if (GET_PROTOCOL_MINOR(clientVersion) >= 4) {
settings.buildVerbosity = (Verbosity) readInt(from);
logType = (LogType) readInt(from);
settings.printBuildTrace = readInt(from) != 0;
}
if (GET_PROTOCOL_MINOR(clientVersion) >= 6)
settings.set("build-cores", int2String(readInt(from)));
if (GET_PROTOCOL_MINOR(clientVersion) >= 10)
settings.set("build-use-substitutes", readInt(from) ? "true" : "false");
if (GET_PROTOCOL_MINOR(clientVersion) >= 12) {
unsigned int n = readInt(from);
for (unsigned int i = 0; i < n; i++) {
string name = readString(from);
string value = readString(from);
if (name == "build-timeout" || name == "use-ssh-substituter")
settings.set(name, value);
else
settings.set(trusted ? name : "untrusted-" + name, value);
}
}
settings.update();
startWork();
stopWork();
break;
}
case wopQuerySubstitutablePathInfo: {
Path path = absPath(readString(from));
startWork();
SubstitutablePathInfos infos;
store->querySubstitutablePathInfos(singleton<PathSet>(path), infos);
stopWork();
SubstitutablePathInfos::iterator i = infos.find(path);
if (i == infos.end())
writeInt(0, to);
else {
writeInt(1, to);
writeString(i->second.deriver, to);
writeStrings(i->second.references, to);
writeLongLong(i->second.downloadSize, to);
if (GET_PROTOCOL_MINOR(clientVersion) >= 7)
writeLongLong(i->second.narSize, to);
}
break;
}
case wopQuerySubstitutablePathInfos: {
PathSet paths = readStorePaths<PathSet>(from);
startWork();
SubstitutablePathInfos infos;
store->querySubstitutablePathInfos(paths, infos);
stopWork();
writeInt(infos.size(), to);
foreach (SubstitutablePathInfos::iterator, i, infos) {
writeString(i->first, to);
writeString(i->second.deriver, to);
writeStrings(i->second.references, to);
writeLongLong(i->second.downloadSize, to);
writeLongLong(i->second.narSize, to);
}
break;
}
case wopQueryAllValidPaths: {
startWork();
PathSet paths = store->queryAllValidPaths();
stopWork();
writeStrings(paths, to);
break;
}
case wopQueryFailedPaths: {
startWork();
PathSet paths = store->queryFailedPaths();
stopWork();
writeStrings(paths, to);
break;
}
case wopClearFailedPaths: {
PathSet paths = readStrings<PathSet>(from);
startWork();
store->clearFailedPaths(paths);
stopWork();
writeInt(1, to);
break;
}
case wopQueryPathInfo: {
Path path = readStorePath(from);
startWork();
ValidPathInfo info = store->queryPathInfo(path);
stopWork();
writeString(info.deriver, to);
writeString(printHash(info.hash), to);
writeStrings(info.references, to);
writeInt(info.registrationTime, to);
writeLongLong(info.narSize, to);
break;
}
default:
throw Error(format("invalid operation %1%") % op);
}
}
static void processConnection(bool trusted)
{
canSendStderr = false;
myPid = getpid();
_writeToStderr = tunnelStderr;
#ifdef HAVE_HUP_NOTIFICATION
/* Allow us to receive SIGPOLL for events on the client socket. */
setSigPollAction(false);
if (fcntl(from.fd, F_SETOWN, getpid()) == -1)
throw SysError("F_SETOWN");
if (fcntl(from.fd, F_SETFL, fcntl(from.fd, F_GETFL, 0) | O_ASYNC) == -1)
throw SysError("F_SETFL");
#endif
/* Exchange the greeting. */
unsigned int magic = readInt(from);
if (magic != WORKER_MAGIC_1) throw Error("protocol mismatch");
writeInt(WORKER_MAGIC_2, to);
writeInt(PROTOCOL_VERSION, to);
to.flush();
unsigned int clientVersion = readInt(from);
if (GET_PROTOCOL_MINOR(clientVersion) >= 14 && readInt(from))
setAffinityTo(readInt(from));
bool reserveSpace = true;
if (GET_PROTOCOL_MINOR(clientVersion) >= 11)
reserveSpace = readInt(from) != 0;
/* Send startup error messages to the client. */
startWork();
try {
/* If we can't accept clientVersion, then throw an error
*here* (not above). */
#if 0
/* Prevent users from doing something very dangerous. */
if (geteuid() == 0 &&
querySetting("build-users-group", "") == "")
throw Error("if you run `nix-daemon' as root, then you MUST set `build-users-group'!");
#endif
/* Open the store. */
store = std::shared_ptr<StoreAPI>(new LocalStore(reserveSpace));
stopWork();
to.flush();
} catch (Error & e) {
stopWork(false, e.msg());
to.flush();
return;
}
/* Process client requests. */
unsigned int opCount = 0;
while (true) {
WorkerOp op;
try {
op = (WorkerOp) readInt(from);
} catch (EndOfFile & e) {
break;
}
opCount++;
try {
performOp(trusted, clientVersion, from, to, op);
} catch (Error & e) {
/* If we're not in a state where we can send replies, then
something went wrong processing the input of the
client. This can happen especially if I/O errors occur
during addTextToStore() / importPath(). If that
happens, just send the error message and exit. */
bool errorAllowed = canSendStderr;
if (!errorAllowed) printMsg(lvlError, format("error processing client input: %1%") % e.msg());
stopWork(false, e.msg(), GET_PROTOCOL_MINOR(clientVersion) >= 8 ? e.status : 0);
if (!errorAllowed) break;
} catch (std::bad_alloc & e) {
if (canSendStderr)
stopWork(false, "Nix daemon out of memory", GET_PROTOCOL_MINOR(clientVersion) >= 8 ? 1 : 0);
throw;
}
to.flush();
assert(!canSendStderr);
};
printMsg(lvlError, format("%1% operations") % opCount);
}
static void sigChldHandler(int sigNo)
{
/* Reap all dead children. */
while (waitpid(-1, 0, WNOHANG) > 0) ;
}
static void setSigChldAction(bool autoReap)
{
struct sigaction act, oact;
act.sa_handler = autoReap ? sigChldHandler : SIG_DFL;
sigfillset(&act.sa_mask);
act.sa_flags = 0;
if (sigaction(SIGCHLD, &act, &oact))
throw SysError("setting SIGCHLD handler");
}
#define SD_LISTEN_FDS_START 3
static void daemonLoop()
{
/* Get rid of children automatically; don't let them become
zombies. */
setSigChldAction(true);
AutoCloseFD fdSocket;
/* Handle socket-based activation by systemd. */
if (getEnv("LISTEN_FDS") != "") {
if (getEnv("LISTEN_PID") != int2String(getpid()) || getEnv("LISTEN_FDS") != "1")
throw Error("unexpected systemd environment variables");
fdSocket = SD_LISTEN_FDS_START;
}
/* Otherwise, create and bind to a Unix domain socket. */
else {
/* Create and bind to a Unix domain socket. */
fdSocket = socket(PF_UNIX, SOCK_STREAM, 0);
if (fdSocket == -1)
throw SysError("cannot create Unix domain socket");
string socketPath = settings.nixDaemonSocketFile;
createDirs(dirOf(socketPath));
/* Urgh, sockaddr_un allows path names of only 108 characters.
So chdir to the socket directory so that we can pass a
relative path name. */
chdir(dirOf(socketPath).c_str());
Path socketPathRel = "./" + baseNameOf(socketPath);
struct sockaddr_un addr;
addr.sun_family = AF_UNIX;
if (socketPathRel.size() >= sizeof(addr.sun_path))
throw Error(format("socket path `%1%' is too long") % socketPathRel);
strcpy(addr.sun_path, socketPathRel.c_str());
unlink(socketPath.c_str());
/* Make sure that the socket is created with 0666 permission
(everybody can connect --- provided they have access to the
directory containing the socket). */
mode_t oldMode = umask(0111);
int res = bind(fdSocket, (struct sockaddr *) &addr, sizeof(addr));
umask(oldMode);
if (res == -1)
throw SysError(format("cannot bind to socket `%1%'") % socketPath);
chdir("/"); /* back to the root */
if (listen(fdSocket, 5) == -1)
throw SysError(format("cannot listen on socket `%1%'") % socketPath);
}
closeOnExec(fdSocket);
/* Loop accepting connections. */
while (1) {
try {
/* Important: the server process *cannot* open the SQLite
database, because it doesn't like forks very much. */
assert(!store);
/* Accept a connection. */
struct sockaddr_un remoteAddr;
socklen_t remoteAddrLen = sizeof(remoteAddr);
AutoCloseFD remote = accept(fdSocket,
(struct sockaddr *) &remoteAddr, &remoteAddrLen);
checkInterrupt();
if (remote == -1) {
if (errno == EINTR)
continue;
else
throw SysError("accepting connection");
}
closeOnExec(remote);
/* Get the identity of the caller, if possible. */
uid_t clientUid = -1;
pid_t clientPid = -1;
bool trusted = false;
#if defined(SO_PEERCRED)
ucred cred;
socklen_t credLen = sizeof(cred);
if (getsockopt(remote, SOL_SOCKET, SO_PEERCRED, &cred, &credLen) != -1) {
clientPid = cred.pid;
clientUid = cred.uid;
if (clientUid == 0) trusted = true;
}
#endif
printMsg(lvlInfo, format("accepted connection from pid %1%, uid %2%") % clientPid % clientUid);
/* Fork a child to handle the connection. */
pid_t child;
child = fork();
switch (child) {
case -1:
throw SysError("unable to fork");
case 0:
try { /* child */
/* Background the daemon. */
if (setsid() == -1)
throw SysError(format("creating a new session"));
/* Restore normal handling of SIGCHLD. */
setSigChldAction(false);
/* For debugging, stuff the pid into argv[1]. */
if (clientPid != -1 && argvSaved[1]) {
string processName = int2String(clientPid);
strncpy(argvSaved[1], processName.c_str(), strlen(argvSaved[1]));
}
/* Handle the connection. */
from.fd = remote;
to.fd = remote;
processConnection(trusted);
} catch (std::exception & e) {
writeToStderr("unexpected Nix daemon error: " + string(e.what()) + "\n");
}
exit(0);
}
} catch (Interrupted & e) {
throw;
} catch (Error & e) {
printMsg(lvlError, format("error processing connection: %1%") % e.msg());
}
}
}
void run(Strings args)
{
for (Strings::iterator i = args.begin(); i != args.end(); ) {
string arg = *i++;
if (arg == "--daemon") /* ignored for backwards compatibility */;
}
chdir("/");
daemonLoop();
}
void printHelp()
{
showManPage("nix-daemon");
}
string programId = "nix-daemon";