On 01/10/2021 22:54, Canek Peláez Valdés wrote:
On Fri, Oct 1, 2021 at 3:37 PM antlists <[email protected]
<mailto:[email protected]>> wrote:
I think it would be much simpler to have a Type=oneshot service at boot,
and the Exec= line to call a script. You can store the timestamp of the
last time it was called someplace in the filesystem (say,
/var/lib/my-script or something), and if the timestamp doesn't exists or
is older than one week, the scripts executes lvm snapshot and updates
the timestamp; otherwise it ends without doing anything.
Ouch. Dunno if that would work. Bear in mind I'm running this BEFORE
fstab, so / is read-only ...
The timer units are very similar to cron, and I believe what you want
cannot be done with cron either; you need special logic and state ("I'm
booting AND haven't run this in at least a week"), so a script is
necessary (I think). Luckly, systemd allows you to smartly manage your
scripts and impose dependencies on them (you need /var in my example,
and you can set it to run before starting X).
I will have to see if the timer can set up the oneshot service, and if
it really is one shot per activation ...
Cheers,
Wol
