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Merge branch 'nix'.

Browse source 
This is a squashed commit of the following:

commit 0dccab9f417b406f5d4aedc81900fc7b2f16c9f6
Author: Eelco Dolstra <eelco.dolstra@logicblox.com>
Date:   Thu Jul 2 00:30:16 2015 +0200

    Typo

commit 2cd28517b13524c242c7758783b0b2d8250fdded
Author: Ludovic Courtès <ludo@gnu.org>
Date:   Wed Jul 1 14:56:34 2015 +0200

    Preserve supplementary groups of build users

    The following patch is an attempt to address this bug (see
    <http://bugs.gnu.org/18994>) by preserving the supplementary groups of
    build users in the build environment.

    In practice, I would expect that supplementary groups would contain only
    one or two groups: the build users group, and possibly the “kvm” group.

    [Changed &at(0) to data() and removed tabs - Eelco]

commit 6e38685ef65284093df79ebe7378bac33b0e7e5d
Author: Eelco Dolstra <eelco.dolstra@logicblox.com>
Date:   Tue Jun 30 21:41:26 2015 +0200

    GC: Handle ENOSPC creating/moving to the trash directory

    Issue #564.

commit 5e0a9ae2e25a1016389f4893a6ed6682aadcf51d
Author: Eelco Dolstra <eelco.dolstra@logicblox.com>
Date:   Mon Jun 22 15:54:55 2015 +0200

    Use posix_fallocate to create /nix/var/nix/db/reserved

commit 4e5ab98d6d14f8b0e3bd1d77b2f4f2354e7a49a8
Author: Eelco Dolstra <eelco.dolstra@logicblox.com>
Date:   Mon Jun 22 15:47:40 2015 +0200

    Make /nix/var/nix/db/reserved bigger

    Issue #564.

commit 60bda60fc06135aa97a93301b1a9e2270768f5b3
Author: Eelco Dolstra <eelco.dolstra@logicblox.com>
Date:   Wed Jun 10 16:17:06 2015 +0200

    Export outputPaths function

    This is useful for the new hydra-queue-runner.

commit 5dfea34048aa8541f20aeb2fbcd163561b609a49
Author: Eelco Dolstra <eelco.dolstra@logicblox.com>
Date:   Thu Jul 2 22:51:33 2015 +0200

    Use std::vector::data()

commit 2459458bc8257734ca78cb7a2db3df20bd730ec0
Author: Eelco Dolstra <eelco.dolstra@logicblox.com>
Date:   Thu Jun 4 16:04:41 2015 +0200

    Allow substitutes for builds that have preferLocalBuild set

    Not substituting builds with "preferLocalBuild = true" was a bad idea,
    because it didn't take the cost of dependencies into account. For
    instance, if we can't substitute a fetchgit call, then we have to
    download/build git and all its dependencies.

    Partially reverts 5558652709f27e8a887580b77b93c705659d7a4b and adds a
    new derivation attribute "allowSubstitutes" to specify whether a
    derivation may be substituted.
This commit is contained in:
Ludovic Courtès 2015-07-02 23:37:29 +02:00
parent d2cef629fd
commit 322eeb87d0
11 changed files with 94 additions and 55 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

64
nix/libstore/build.cc
View file

@ -447,6 +447,7 @@ private:
string user;
uid_t uid;
gid_t gid;
std::vector<gid_t> supplementaryGIDs;
public:
UserLock();
@ -460,6 +461,7 @@ public:
string getUser() { return user; }
uid_t getUID() { return uid; }
uid_t getGID() { return gid; }
std::vector<gid_t> getSupplementaryGIDs() { return supplementaryGIDs; }
bool enabled() { return uid != 0; }
@ -539,6 +541,17 @@ void UserLock::acquire()
throw Error(format("the Nix user should not be a member of `%1%'")
% settings.buildUsersGroup);
/* Get the list of supplementary groups of this build user. This
is usually either empty or contains a group such as "kvm". */
supplementaryGIDs.resize(10);
int ngroups = supplementaryGIDs.size();
int err = getgrouplist(pw->pw_name, pw->pw_gid,
supplementaryGIDs.data(), &ngroups);
if (err == -1)
throw Error(format("failed to get list of supplementary groups for ‘%1%’") % pw->pw_name);
supplementaryGIDs.resize(ngroups);
return;
}
}
@ -1000,7 +1013,7 @@ void DerivationGoal::haveDerivation()
/* We are first going to try to create the invalid output paths
through substitutes. If that doesn't work, we'll build
them. */
if (settings.useSubstitutes && !willBuildLocally(drv))
if (settings.useSubstitutes && substitutesAllowed(drv))
foreach (PathSet::iterator, i, invalidOutputs)
addWaitee(worker.makeSubstitutionGoal(*i, buildMode == bmRepair));
@ -1188,22 +1201,6 @@ void DerivationGoal::inputsRealised()
}
PathSet outputPaths(const DerivationOutputs & outputs)
{
PathSet paths;
foreach (DerivationOutputs::const_iterator, i, outputs)
paths.insert(i->second.path);
return paths;
}
static string get(const StringPairs & map, const string & key)
{
StringPairs::const_iterator i = map.find(key);
return i == map.end() ? (string) "" : i->second;
}
static bool canBuildLocally(const string & platform)
{
return platform == settings.thisSystem
@ -1214,12 +1211,25 @@ static bool canBuildLocally(const string & platform)
}
static string get(const StringPairs & map, const string & key, const string & def = "")
{
StringPairs::const_iterator i = map.find(key);
return i == map.end() ? def : i->second;
}
bool willBuildLocally(const Derivation & drv)
{
return get(drv.env, "preferLocalBuild") == "1" && canBuildLocally(drv.platform);
}
bool substitutesAllowed(const Derivation & drv)
{
return get(drv.env, "allowSubstitutes", "1") == "1";
}
void DerivationGoal::tryToBuild()
{
trace("trying to build");
@ -1242,7 +1252,7 @@ void DerivationGoal::tryToBuild()
can't acquire the lock, then continue; hopefully some other
goal can start a build, and if not, the main loop will sleep a
few seconds and then retry this goal. */
if (!outputLocks.lockPaths(outputPaths(drv.outputs), "", false)) {
if (!outputLocks.lockPaths(outputPaths(drv), "", false)) {
worker.waitForAWhile(shared_from_this());
return;
}
@ -1263,7 +1273,7 @@ void DerivationGoal::tryToBuild()
return;
}
missingPaths = outputPaths(drv.outputs);
missingPaths = outputPaths(drv);
if (buildMode != bmCheck)
foreach (PathSet::iterator, i, validPaths) missingPaths.erase(*i);
@ -2168,7 +2178,6 @@ void DerivationGoal::runChild()
Strings envStrs;
foreach (Environment::const_iterator, i, env)
envStrs.push_back(rewriteHashes(i->first + "=" + i->second, rewritesToTmp));
auto envArr = stringsToCharPtrs(envStrs);
/* If we are running in `build-users' mode, then switch to the
user we allocated above. Make sure that we drop all root
@ -2177,10 +2186,11 @@ void DerivationGoal::runChild()
setuid() when run as root sets the real, effective and
saved UIDs. */
if (buildUser.enabled()) {
printMsg(lvlChatty, format("switching to user `%1%'") % buildUser.getUser());
if (setgroups(0, 0) == -1)
throw SysError("cannot clear the set of supplementary groups");
/* Preserve supplementary groups of the build user, to allow
admins to specify groups such as "kvm". */
if (setgroups(buildUser.getSupplementaryGIDs().size(),
buildUser.getSupplementaryGIDs().data()) == -1)
throw SysError("cannot set supplementary groups of build user");
if (setgid(buildUser.getGID()) == -1 ||
getgid() != buildUser.getGID() ||
@ -2199,7 +2209,6 @@ void DerivationGoal::runChild()
args.push_back(builderBasename);
foreach (Strings::iterator, i, drv.args)
args.push_back(rewriteHashes(*i, rewritesToTmp));
auto argArr = stringsToCharPtrs(args);
restoreSIGPIPE();
@ -2207,7 +2216,7 @@ void DerivationGoal::runChild()
writeFull(STDERR_FILENO, "\n");
/* Execute the program. This should not return. */
execve(drv.builder.c_str(), (char * *) &argArr[0], (char * *) &envArr[0]);
execve(drv.builder.c_str(), stringsToCharPtrs(args).data(), stringsToCharPtrs(envStrs).data());
throw SysError(format("executing `%1%'") % drv.builder);
@ -2837,7 +2846,6 @@ void SubstitutionGoal::tryToRun()
args.push_back("--substitute");
args.push_back(storePath);
args.push_back(destPath);
auto argArr = stringsToCharPtrs(args);
/* Fork the substitute program. */
pid = startProcess([&]() {
@ -2847,7 +2855,7 @@ void SubstitutionGoal::tryToRun()
if (dup2(outPipe.writeSide, STDOUT_FILENO) == -1)
throw SysError("cannot dup output pipe into stdout");
execv(sub.c_str(), (char * *) &argArr[0]);
execv(sub.c_str(), stringsToCharPtrs(args).data());
throw SysError(format("executing `%1%'") % sub);
});

9
nix/libstore/derivations.cc
View file

@ -285,4 +285,13 @@ bool wantOutput(const string & output, const std::set<string> & wanted)
}
PathSet outputPaths(const Derivation & drv)
{
PathSet paths;
for (auto & i : drv.outputs)
paths.insert(i.second.path);
return paths;
}
}

1
nix/libstore/derivations.hh
View file

@ -89,5 +89,6 @@ Path makeDrvPathWithOutputs(const Path & drvPath, const std::set<string> & outpu
bool wantOutput(const string & output, const std::set<string> & wanted);
PathSet outputPaths(const Derivation & drv);
}

31
nix/libstore/gc.cc
View file

@ -376,6 +376,7 @@ struct LocalStore::GCState
bool gcKeepOutputs;
bool gcKeepDerivations;
unsigned long long bytesInvalidated;
bool moveToTrash = true;
Path trashDir;
bool shouldDelete;
GCState(GCResults & results_) : results(results_), bytesInvalidated(0) { }
@ -428,16 +429,23 @@ void LocalStore::deletePathRecursive(GCState & state, const Path & path)
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)) {
if (state.moveToTrash && 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;
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);
try {
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);
state.bytesInvalidated += size;
} catch (SysError & e) {
if (e.errNo == ENOSPC) {
printMsg(lvlInfo, format("note: can't create move `%1%': %2%") % path % e.msg());
deleteGarbage(state, path);
}
}
} else
deleteGarbage(state, path);
@ -636,7 +644,14 @@ void LocalStore::collectGarbage(const GCOptions & options, GCResults & results)
if (state.shouldDelete) {
if (pathExists(state.trashDir)) deleteGarbage(state, state.trashDir);
createDirs(state.trashDir);
try {
createDirs(state.trashDir);
} catch (SysError & e) {
if (e.errNo == ENOSPC) {
printMsg(lvlInfo, format("note: can't create trash directory: %1%") % e.msg());
state.moveToTrash = false;
}
}
}
/* Now either delete all garbage paths, or just the specified

2
nix/libstore/globals.cc
View file

@ -36,7 +36,7 @@ Settings::Settings()
buildTimeout = 0;
useBuildHook = true;
printBuildTrace = false;
reservedSize = 1024 * 1024;
reservedSize = 8 * 1024 * 1024;
fsyncMetadata = true;
useSQLiteWAL = true;
syncBeforeRegistering = false;

18
nix/libstore/local-store.cc
View file

@ -288,7 +288,17 @@ LocalStore::LocalStore(bool reserveSpace)
struct stat st;
if (stat(reservedPath.c_str(), &st) == -1 ||
st.st_size != settings.reservedSize)
writeFile(reservedPath, string(settings.reservedSize, 'X'));
{
AutoCloseFD fd = open(reservedPath.c_str(), O_WRONLY | O_CREAT, 0600);
int res = -1;
#if HAVE_POSIX_FALLOCATE
res = posix_fallocate(fd, 0, settings.reservedSize);
#endif
if (res == -1) {
writeFull(fd, string(settings.reservedSize, 'X'));
ftruncate(fd, settings.reservedSize);
}
}
}
else
deletePath(reservedPath);
@ -1166,10 +1176,8 @@ string LocalStore::getLineFromSubstituter(RunningSubstituter & run)
if (n == 0) throw EndOfFile(format("substituter `%1%' died unexpectedly") % run.program);
err.append(buf, n);
string::size_type p;
while (((p = err.find('\n')) != string::npos)
|| ((p = err.find('\r')) != string::npos)) {
string thing(err, 0, p + 1);
writeToStderr(run.program + ": " + thing);
while ((p = err.find('\n')) != string::npos) {
printMsg(lvlError, run.program + ": " + string(err, 0, p));
err = string(err, p + 1);
}
}

4
nix/libstore/misc.cc
View file

@ -120,7 +120,7 @@ void queryMissing(StoreAPI & store, const PathSet & targets,
if (invalid.empty()) continue;
todoDrv.insert(*i);
if (settings.useSubstitutes && !willBuildLocally(drv))
if (settings.useSubstitutes && substitutesAllowed(drv))
query.insert(invalid.begin(), invalid.end());
}
@ -144,7 +144,7 @@ void queryMissing(StoreAPI & store, const PathSet & targets,
PathSet outputs;
bool mustBuild = false;
if (settings.useSubstitutes && !willBuildLocally(drv)) {
if (settings.useSubstitutes && substitutesAllowed(drv)) {
foreach (DerivationOutputs::iterator, j, drv.outputs) {
if (!wantOutput(j->first, i2.second)) continue;
if (!store.isValidPath(j->second.path)) {

2
nix/libstore/misc.hh
View file

@ -34,5 +34,7 @@ void queryMissing(StoreAPI & store, const PathSet & targets,
bool willBuildLocally(const Derivation & drv);
bool substitutesAllowed(const Derivation & drv);
}

11
nix/libutil/util.cc
View file

@ -897,10 +897,10 @@ pid_t startProcess(std::function<void()> fun,
}
std::vector<const char *> stringsToCharPtrs(const Strings & ss)
std::vector<char *> stringsToCharPtrs(const Strings & ss)
{
std::vector<const char *> res;
for (auto & s : ss) res.push_back(s.c_str());
std::vector<char *> res;
for (auto & s : ss) res.push_back((char *) s.c_str());
res.push_back(0);
return res;
}
@ -921,12 +921,11 @@ string runProgram(Path program, bool searchPath, const Strings & args)
Strings args_(args);
args_.push_front(program);
auto cargs = stringsToCharPtrs(args_);
if (searchPath)
execvp(program.c_str(), (char * *) &cargs[0]);
execvp(program.c_str(), stringsToCharPtrs(args_).data());
else
execv(program.c_str(), (char * *) &cargs[0]);
execv(program.c_str(), stringsToCharPtrs(args_).data());
throw SysError(format("executing `%1%'") % program);
});

2
nix/libutil/util.hh
View file

@ -284,7 +284,7 @@ MakeError(ExecError, Error)
/* Convert a list of strings to a null-terminated vector of char
*'s. The result must not be accessed beyond the lifetime of the
list of strings. */
std::vector<const char *> stringsToCharPtrs(const Strings & ss);
std::vector<char *> stringsToCharPtrs(const Strings & ss);
/* Close all file descriptors except stdin, stdout, stderr, and those
listed in the given set. Good practice in child processes. */

5
nix/nix-daemon/nix-daemon.cc
View file

@ -440,10 +440,7 @@ static void performOp(bool trusted, unsigned int clientVersion,
case wopImportPaths: {
startWork();
TunnelSource source(from);
/* Unlike Nix, always require a signature, even for "trusted"
users. */
Paths paths = store->importPaths(true, source);
Paths paths = store->importPaths(!trusted, source);
stopWork();
writeStrings(paths, to);
break;