Re: [gentoo-user] systemd boot timer

[antlists]

On 01/10/2021 22:54, Canek Peláez Valdés wrote:
> On Fri, Oct 1, 2021 at 3:37 PM antlists <antlists@××××××××××××.uk
> <mailto:antlists@××××××××××××.uk>> 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