The script /etc/cron.daily/yum.cron creates lock directory /var/lock/yum-cron.lock instead of file.
Because the file /etc/rc.d/rc.sysinit from initscripts package clean up /var/lock on system start but removes only files (except /var/lock/cvs and /var/run/screen directories), there is a probability, that stale lock dir /var/lock/yum-cron.lock is not removed on next restart and thus no updates will be applied ever more.
So please change "mkdir $LOCKFILE" to "touch $LOCKFILE" and "rmdir $LOCKFILE" to "rm -f $LOCKFILE".
Created attachment 322230 [details]
Use lock file instead of directory
There should be a test at the wery beginning of the script:
[ -d /var/lock/yum-cron.lock ] && rmdir /var/lock/yum-cron.lock
This command work around stale lock dir that should be deleted. Better solution may be %post script in the SPEC file or the stalled lock directory will break yum-cron for ever.
Bug 327401 complained that using a lockfile rather than a lock directory was a non-atomic operation that introduced a race condition, so yum-cron's lockfile was changed to a directory as a result. Can you please read that bug and see if you agree with the logic.
Regarding comment #2, will check to see what we've got going already for stale lockfile checking and get back to you. We can't just nuke any existing lockfile at the start of the script, or then it won't be able to actually prevent a second instance from running, so would need to store the pid in there so we can check if that pid is running too.
As of comment #2 (simple lock removal) - you may delete it safely because yum does its own locking so no conflict is dangerous here (only error message output through cron email until already-running process is done).
You are using bash shell so you may do proper locking this way:
set -o noclobber
echo > /var/lock/subsys/$LOCKNAME
[ $? -ne 0 ] && failure
set +o noclobber
Locking may be done by using "mv", but mv does not provide the ability to tell us that rename failed (but did so). Also locking may be done by using "ln" but as lock file is symlink then, one have to verify all lock-file checks (to accept symlink not only normal files) so this method may interferre other parts of the distribution. You may also write own portable locking function but this is worthless as we have bash and noclobber (also present in csh, tcsh and possibly other shells).
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