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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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73
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
{
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;
AutoCloseFD fdUserLock;
@ -515,7 +509,6 @@ private:
public:
UserLock();
~UserLock();
void kill();
@ -529,9 +522,6 @@ public:
};
Sync<PathSet> UserLock::lockedPaths_;
UserLock::UserLock()
{
assert(settings.buildUsersGroup != "");
@ -568,47 +558,34 @@ UserLock::UserLock()
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;
}
AutoCloseFD fd = open(fnUserLock.c_str(), O_RDWR | O_CREAT | O_CLOEXEC, 0600);
if (!fd)
throw SysError(format("opening user lock '%1%'") % fnUserLock);
try {
if (lockFile(fd.get(), ltWrite, false)) {
fdUserLock = std::move(fd);
user = i;
uid = pw->pw_uid;
AutoCloseFD fd = open(fnUserLock.c_str(), O_RDWR | O_CREAT | O_CLOEXEC, 0600);
if (!fd)
throw SysError(format("opening user lock '%1%'") % fnUserLock);
if (lockFile(fd.get(), ltWrite, false)) {
fdUserLock = std::move(fd);
user = i;
uid = pw->pw_uid;
/* Sanity check... */
if (uid == getuid() || uid == geteuid())
throw Error(format("the Nix user should not be a member of '%1%'")
% settings.buildUsersGroup);
/* Sanity check... */
if (uid == getuid() || uid == geteuid())
throw Error(format("the Nix user should not be a member of '%1%'")
% settings.buildUsersGroup);
#if __linux__
/* 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);
/* 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);
supplementaryGIDs.resize(ngroups);
#endif
return;
}
} catch (...) {
lockedPaths_.lock()->erase(fnUserLock);
return;
}
}
@ -618,14 +595,6 @@ UserLock::UserLock()
}
UserLock::~UserLock()
{
auto lockedPaths(lockedPaths_.lock());
auto erased = lockedPaths->erase(fnUserLock);
assert(erased);
}
void UserLock::kill()
{
killUser(uid);