aboutsummaryrefslogtreecommitdiff
path: root/nix/libstore/build.cc
diff options
context:
space:
mode:
Diffstat (limited to 'nix/libstore/build.cc')
-rw-r--r--nix/libstore/build.cc62
1 files changed, 35 insertions, 27 deletions
diff --git a/nix/libstore/build.cc b/nix/libstore/build.cc
index 85a818ba94..a9eedcef16 100644
--- a/nix/libstore/build.cc
+++ b/nix/libstore/build.cc
@@ -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));
@@ -1188,35 +1201,32 @@ void DerivationGoal::inputsRealised()
}
-PathSet outputPaths(const DerivationOutputs & outputs)
+static bool canBuildLocally(const string & platform)
{
- PathSet paths;
- foreach (DerivationOutputs::const_iterator, i, outputs)
- paths.insert(i->second.path);
- return paths;
+ return platform == settings.thisSystem
+#if __linux__
+ || (platform == "i686-linux" && settings.thisSystem == "x86_64-linux")
+#endif
+ ;
}
-static string get(const StringPairs & map, const string & key)
+static string get(const StringPairs & map, const string & key, const string & def = "")
{
StringPairs::const_iterator i = map.find(key);
- return i == map.end() ? (string) "" : i->second;
+ return i == map.end() ? def : i->second;
}
-static bool canBuildLocally(const string & platform)
+bool willBuildLocally(const Derivation & drv)
{
- return platform == settings.thisSystem
-#if __linux__
- || (platform == "i686-linux" && settings.thisSystem == "x86_64-linux")
-#endif
- ;
+ return get(drv.env, "preferLocalBuild") == "1" && canBuildLocally(drv.platform);
}
-bool willBuildLocally(const Derivation & drv)
+bool substitutesAllowed(const Derivation & drv)
{
- return get(drv.env, "preferLocalBuild") == "1" && canBuildLocally(drv.platform);
+ return get(drv.env, "allowSubstitutes", "1") == "1";
}
@@ -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);
});