Not that if B has After=A does not imply that the two don't run at the
same time. If B is already running, A will be started as well. That's
the reason why we added a lock file in apt:
if [ "$1" = "lock_is_held" ]; then
shift
else
# Maintain a lock on fd 3, so we can't run the script twice at the same
# time.
eval $(apt-config shell StateDir Dir::State/d)
exec 3>${StateDir}/daily_lock
if ! flock -w 3600 3; then
echo "E: Could not acquire lock" >&2
exit 1
fi
# We hold the lock. Rerun this script as a child process, which
# can run without propagating an extra fd to all of its children.
"$0" lock_is_held "$@" 3>&-
exit $?
fi
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https://bugs.launchpad.net/bugs/1711428
Title:
cloud-init sometimes fails on dpkg lock due to concurrent apt-daily-
upgrade.service execution
To manage notifications about this bug go to:
https://bugs.launchpad.net/cloud-init/+bug/1711428/+subscriptions
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