[systemd-devel] Starting service conditionally and retrying when failure

[Mantas Mikulėnas]

On Thu, Oct 5, 2017 at 7:51 AM, sdrb <sdrb at onet.eu> wrote:

> Hi,
>
> I'd like to ask how to achieve following functionality in systemd:
>
> I'd like to start alsa-restore.service only once just after one of the
> specified files appears. Those file matches: /dev/snd/control*.
>
> For now I have something like this:
>
> [Unit]
> Description=Save/Restore Sound Card State
> ConditionPathExistsGlob=/dev/snd/control*
> After=sysinit.target
>
> [Service]
> Type=oneshot
> RemainAfterExit=true
> ExecStart=-/sbin/alsactl restore -f /etc/asound.state
>
> [Install]
> WantedBy=multi-user.target
>
>
> but during the start when there is no any of /dev/snd/control* files - the
> condition is not meet and the service is not going up.
> Those files appears later.
>
> So that what I'd like to achieve is to wait for appearing of those files
> and then starting alsa-restore service.
>

Isn't that exactly what ALSA's
standard /usr/lib/udev/rules.d/90-alsa-restore.rules does?

-- 
Mantas Mikulėnas <grawity at gmail.com>
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