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Don't block while waiting for build users

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This commit is contained in:
Alexander Bantyev 2020-05-08 12:22:39 +03:00
parent 04967dee9d
commit 14073fb76b
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1 changed files with 29 additions and 25 deletions
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54
src/libstore/build.cc
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@ -507,9 +507,6 @@ private:
Path fnUserLock;
AutoCloseFD fdUserLock;
bool findFreeUser();
string user;
uid_t uid;
gid_t gid;
@ -525,20 +522,19 @@ public:
uid_t getGID() { assert(gid); return gid; }
std::vector<gid_t> getSupplementaryGIDs() { return supplementaryGIDs; }
bool findFreeUser();
bool enabled() { return uid != 0; }
};
UserLock::UserLock()
{
assert(settings.buildUsersGroup != "");
createDirs(settings.nixStateDir + "/userpool");
if (findFreeUser()) return;
printError("waiting for build users");
do std::this_thread::sleep_for(std::chrono::seconds(2)); while (! findFreeUser());
/* Mark that user is not enabled by default */
uid = 0;
}
bool UserLock::findFreeUser() {
@ -1398,6 +1394,30 @@ void DerivationGoal::tryToBuild()
{
trace("trying to build");
/* If `build-users-group' is not empty, then we have to build as
one of the members of that group. */
if (settings.buildUsersGroup != "" && getuid() == 0) {
#if defined(__linux__) || defined(__APPLE__)
if (!buildUser) buildUser = std::make_unique<UserLock>();
if (!buildUser->enabled()) {
if (!buildUser->findFreeUser()) {
debug("waiting for build users");
worker.waitForAWhile(shared_from_this());
return;
}
/* Make sure that no other processes are executing under this
uid. */
buildUser->kill();
}
#else
/* Don't know how to block the creation of setuid/setgid
binaries on this platform. */
throw Error("build users are not supported on this platform for security reasons");
#endif
}
/* Obtain locks on all output paths. The locks are automatically
released when we exit this function or Nix crashes. If we
can't acquire the lock, then continue; hopefully some other
@ -1950,22 +1970,6 @@ void DerivationGoal::startBuilder()
#endif
}
/* If `build-users-group' is not empty, then we have to build as
one of the members of that group. */
if (settings.buildUsersGroup != "" && getuid() == 0) {
#if defined(__linux__) || defined(__APPLE__)
buildUser = std::make_unique<UserLock>();
/* Make sure that no other processes are executing under this
uid. */
buildUser->kill();
#else
/* Don't know how to block the creation of setuid/setgid
binaries on this platform. */
throw Error("build users are not supported on this platform for security reasons");
#endif
}
/* Create a temporary directory where the build will take
place. */
tmpDir = createTempDir("", "nix-build-" + std::string(drvPath.name()), false, false, 0700);