units: so far we defaulted to 90s as default timeout for most things, let's do so for our oneshot services too Fewer surprises, and stuff...

units: set TimeoutSec on some oneshot services Services which are not crucial to system bootup, and have Type=oneshot can effectively "hang" the system if they fail to complete for whatever reason. To allow the boot to continue, kill them after a timeout. In case of systemd-journal-flush the flush will continue in the background, and in the other two cases the job will be aborted, but this should not result in any permanent problem.

readahead: wipe out readahead

units: drop RefuseManualStart= from a couple of update services The only update service we really need to guard like this is systemd-tmpfiles-setup.service since if invoked manually might create /var/run/nologin and thus blocking the user from login. The other services are pretty much idempotent and don't suffer by this problem, hence let's simplify them.

units: rebuild /etc/passwd, the udev hwdb and the journal catalog files on boot Only when necessary of course, nicely guarded with the new ConditionNeedsUpdate= condition we added.