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Remove UserLock self-lock check

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This is no longer needed since we're not using POSIX locks anymore.
This commit is contained in:
Eelco Dolstra 2019-12-09 23:57:33 +01:00
parent 3b9c9d34e5
commit 61cc9f34d2
1 changed files with 21 additions and 52 deletions
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31
src/libstore/build.cc
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@ -499,12 +499,6 @@ void handleDiffHook(uid_t uid, uid_t gid, Path tryA, Path tryB, Path drvPath, Pa
class UserLock class UserLock
{ {
private: private:
/* POSIX locks suck. If we have a lock on a file, and we open and
close that file again (without closing the original file
descriptor), we lose the lock. So we have to be *very* careful
not to open a lock file on which we are holding a lock. */
static Sync<PathSet> lockedPaths_;
Path fnUserLock; Path fnUserLock;
AutoCloseFD fdUserLock; AutoCloseFD fdUserLock;
@ -515,7 +509,6 @@ private:
public: public:
UserLock(); UserLock();
~UserLock();
void kill(); void kill();
@ -529,9 +522,6 @@ public:
}; };
Sync<PathSet> UserLock::lockedPaths_;
UserLock::UserLock() UserLock::UserLock()
{ {
assert(settings.buildUsersGroup != ""); assert(settings.buildUsersGroup != "");
@ -568,15 +558,6 @@ UserLock::UserLock()
fnUserLock = (format("%1%/userpool/%2%") % settings.nixStateDir % pw->pw_uid).str(); fnUserLock = (format("%1%/userpool/%2%") % settings.nixStateDir % pw->pw_uid).str();
{
auto lockedPaths(lockedPaths_.lock());
if (!lockedPaths->insert(fnUserLock).second)
/* We already have a lock on this one. */
continue;
}
try {
AutoCloseFD fd = open(fnUserLock.c_str(), O_RDWR | O_CREAT | O_CLOEXEC, 0600); AutoCloseFD fd = open(fnUserLock.c_str(), O_RDWR | O_CREAT | O_CLOEXEC, 0600);
if (!fd) if (!fd)
throw SysError(format("opening user lock '%1%'") % fnUserLock); throw SysError(format("opening user lock '%1%'") % fnUserLock);
@ -606,10 +587,6 @@ UserLock::UserLock()
return; return;
} }
} catch (...) {
lockedPaths_.lock()->erase(fnUserLock);
}
} }
throw Error(format("all build users are currently in use; " throw Error(format("all build users are currently in use; "
@ -618,14 +595,6 @@ UserLock::UserLock()
} }
UserLock::~UserLock()
{
auto lockedPaths(lockedPaths_.lock());
auto erased = lockedPaths->erase(fnUserLock);
assert(erased);
}
void UserLock::kill() void UserLock::kill()
{ {
killUser(uid); killUser(uid);