Hello,
This logic is correct. apt_pkg.get_lock(options.lock_file) is trying to
acquire a lockfile (/var/run/unattended-upgrades.lock) which is only
possible if no unattended-upgrade is already running. If it can acquire
the lock, it means that NO unattended-upgrade is running, hence shutdown
may proceed.
while True:
res = apt_pkg.get_lock(options.lock_file)
logging.debug("get_lock returned %i" % res)
# exit here if there is no lock
if res > 0:
logging.debug("lock not taken")
break
lock_was_taken = True
The problem is that apt_pkg.get_lock(options.lock_file) will also return
-1 if the path to the lock file doesn't exist, which is the case when
/var is unmounted, hence /var/run is no longer present (/var/run is a
symlink to /run).
I'm working on identifying the proper systemd order to make sure that
/var/run is still accessible.
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https://bugs.launchpad.net/bugs/1654600
Title:
unattended-upgrade-shutdown hangs when /var is a separate filesystem
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