[systemd-devel] Launching script that needs network before suspend

[Andrei Borzenkov]

On Mon, Jan 24, 2022 at 1:14 AM Tomáš Hnyk <tomashnyk at gmail.com> wrote:
>
> Hello,
> I have my computer hooked up to an AVR that runs my home cinema and ideally I would like the computer to turn off the AVR when I turn it off or suspend it. The only way to do this is over network and I wrote a simple script that does just that. Hooking it to shutdown was quite easy using network.target that is defined when shutting down.
>
> I am struggling to make it work with suspend though. When I look at the logs, terminating network seems to be the first thing that happens when suspend is invoked. I tried putting the script to /usr/lib/systemd/system-sleep/ and it runs, but only after network si down, so it fails. Running the script with systemd-inhibit (ExecStart=/usr/bin/systemd-inhibit --what=sleep my_script) tells me that "Failed to inhibit: The operation inhibition has been requested for is already running".
>

What network management program are you using?

> Is there a way to make this work with service files by specifying that the script needs to be run before network is shut down or would I need to run a daemon listening for PrepareForSleep as here: https://github.com/davidn/av/blob/master/av ?
>

Yes, this is probably the only generic solution.