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build-remote.pl: don't wait forever for the upload lock

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In the build hook, don't wait forever to get the upload lock.  This
ensures progress if another process gets stuck while holding the
upload lock.
This commit is contained in:
Eelco Dolstra 2012-03-05 17:58:09 +01:00
parent 8afd28a922
commit 56042a120a
1 changed files with 17 additions and 3 deletions
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20
scripts/build-remote.pl.in
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@ -232,10 +232,24 @@ sub removeRoots {
# the same missing path simultaneously, causing the effective network
# bandwidth and target disk speed to be divided by N.
my $uploadLock = "$currentLoad/$hostName.upload-lock";
sysopen MAINLOCK, "$uploadLock", O_RDWR|O_CREAT, 0600 or die;
flock(MAINLOCK, LOCK_EX) or die;
sysopen UPLOADLOCK, "$uploadLock", O_RDWR|O_CREAT, 0600 or die;
eval {
local $SIG{ALRM} = sub { die "alarm\n" };
# Don't wait forever, so that a process that gets stuck while
# holding the lock doesn't block everybody else indefinitely.
# It's safe to continue after a timeout, just (potentially)
# inefficient.
alarm 15 * 60;
flock(UPLOADLOCK, LOCK_EX);
alarm 0;
};
if ($@) {
die unless $@ eq "alarm\n";
print STDERR "somebody is hogging $uploadLock, continuing...\n";
unlink $uploadLock;
}
Nix::CopyClosure::copyTo($hostName, [ @sshOpts ], [ $drvPath, @inputs ], "", "", 0, 0, $maybeSign ne "");
close MAINLOCK;
close UPLOADLOCK;
# Perform the build.