mirror of
https://git.in.rschanz.org/ryan77627/guix.git
synced 2024-12-27 06:42:14 -05:00
331 lines
9 KiB
C++
331 lines
9 KiB
C++
#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());
|
|
}
|
|
|
|
|
|
}
|