[systemd-devel] Help writing a user service file that will exec a command upon system sleep

[Richard Maw]

On Mon, Nov 02, 2015 at 04:11:14PM +0200, Mantas Mikulėnas wrote:
> On Mon, Nov 2, 2015 at 3:34 PM, Richard Maw <richard.maw at codethink.co.uk>
> wrote:
> 
> > On Mon, Nov 02, 2015 at 09:04:31AM +0100, Lennart Poettering wrote:
> > > On Wed, 28.10.15 19:30, John (da_audiophile at yahoo.com) wrote:
> > >
> > > > I have a simple bash script that I would like to have a user service
> > > > file run with an argument when the system enters a sleep or
> > > > hibernation state but as I understand it, user service units do not
> > > > use the sleep.target.  The goal is to have the following run before
> > > > the system goes into sleep/hibernate triggered by whatever mechanism
> > > > systemd uses to detect when the user sleeps or hibernates the
> > > > system: '/usr/bin/psd sync'
> > >
> > > You can install a suspend delay inhibitor:
> > >
> > > https://wiki.freedesktop.org/www/Software/systemd/inhibit/
> > >
> > > That works from privileged code the same as for user code. However,
> > > you cannot really do that from shell code. I fear for shell this is
> > > simply not available, sorry.
> >
> > You may be able to abuse the hell out of systemd-inhibit to have it work:
> >
> > #!/bin/sh
> > # Approach cribbed from http://www.opopop.net/Harnessing_DBus/
> 
> 
> Might as well use ctypes.sh then...

Heh, certainly. I'd forgotten that existed.

I mostly took the suggestion that it wasn't possible from shell as a challenge :-)