On Thu, 09.03.17 15:53, Jonathan Dowland (jon+systemd-de...@alcopop.org) wrote:
> Hey, > > I have some backup services which depend on mounts. I want those > filesystems unmounted when the backup jobs are not running. This is > easily achieved with StopWhenUnneeded. > > I also want to trigger the backup jobs to start when I attach my > external HDD. This is reasonably simple by adding WantedBy=<device> > to the backup service (*not* the mount unit, or it will never be > auto-unmounted). > > So far so good! > > However, this is a headless box and I want to blink an LED when certain > jobs are running, finish or fail. So I need to execute commands in > certain situations. Job failure is easy, I can use OnFailure= and set up > a oneshot service. Job started isn't too bad, I add a ExecStart=- > to my backup service before the real one. > > Signalling "device is safe to remove" I have not figured out. > Using a chain of blah.device -> blah.mount -> backup-blah.service units, > "safe to remove" LED should only happen after the mount has completed > unmounting, successfully. Is there an existing "hook" or place that I > could put that in this situation? On recent systemd versions you can plug in a script in ExecStop= of your backup service, and check the $SERVICE_RESULT env var which tells you the success state of the service, which you can then use to set any LEDs you like. Lennart -- Lennart Poettering, Red Hat _______________________________________________ systemd-devel mailing list systemd-devel@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/systemd-devel
