[systemd-devel] Help with running a script at shutdown and make it run first before other services

[David Elie-Dit-Cosaque]

Hi Dan and Andrei, thanks a lot  for the explanation and code snippets, I
try it out.

Thanks,
David.

On Sun, Dec 8, 2024 at 10:13 AM Dan Nicholson <dbn at endlessos.org> wrote:

> On Fri, Dec 6, 2024 at 3:16 PM David Elie-Dit-Cosaque
> <deliedit at redhat.com> wrote:
> >
> > Hi All,
> >
> > I am trying to create a systemd service that would execute a script at
> shutdown before any other services start receiving shutdown notifications.
> I came up with this:
> >
> > [Service]
> > Type=oneshot
> > RemainAfterExit=true
> > ExecStart=/usr/bin/true
> > ExecStop=/usr/local/bin/myscript.sh
> > [Install]
> > WantedBy=multi-user.target
> >
> > The script does run after shutdown is initiated but since it relies on
> other services which are also shutting down, it fails. Is there a way to
> order the shutdown so that  myscript.sh is completed first before
> continuing with the shutdown?
>
> When stopping units, systemd reverses the ordering. For example, if
> you have a service that has After=ssh.service, then the service is
> started after ssh.service and stopped before it.
>
> So, you just need to add After for any services or targets that you
> care about even if you don't have ExecStart. Here's an example of a
> service that runs on shutdown that does nothing when starting -
>
> https://github.com/ostreedev/ostree/blob/main/src/boot/ostree-finalize-staged.service
> .
>
> ---
> Dan
>
>
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