[systemd-devel] At wits end... need to execute a script prior to anything getting killed/changed on reboot/shutdown

[Christopher Cox]

On 1/17/19 11:01 AM, Lennart Poettering wrote:
> On Do, 17.01.19 10:18, Christopher Cox (ccox at endlessnow.com) wrote:
>
>> On 1/17/19 5:50 AM, Lennart Poettering wrote:
>>> With that you can now put together a unit that is terminated
>>> relatively early on during shutdown: just make it
>>> "After=multi-user.target graphical.target default.target", so that it
>>> gets activated at boot very late, and thus deactivated at shutdown
>>> very early.
>> Thanks, I think I had this on one of my many attempts.  But changed to suit.
>>
>> [Unit]
>> Description=my-service-save save run state
>> After=multi-user.target graphical.target default.target
>>
>> [Service]
>> Type=oneshot
>> ExecStop=/usr/local/bin/my-services.sh save
>> RemainAfterExit=yes
>>
>> [Install]
>> WantedBy=multi-user.target
>>
>> In my case, my script rolls through the currently running processes, looking
>> for certain ones, determines listening port (ss) and gets the time the
>> process was started (stat) and outputs info to a file.
>>
>> What I'm seeing is a file at shutdown that does not contain all the
>> processes.
> Hmm, what kind of processes are you missing? user session stuff? How
> do you shut down? Note that display managers are likely to terminate
> the user sessions first, and only initiate system shutdown then...

These are nohup'd background processes not tied to any tty.