Set systemd services to automatically restart

[Gold872]

No description provided.

[Levi-Lesches]

This is tricky because I saw the Pi refuse to shut down when this was enabled, but I agree that it doesn't sound like that should happen. Here's an excerpt from the docs:

Restart=

Configures whether the service shall be restarted when the service process exits, is killed, or a timeout is reached. The service process may be the main service process, but it may also be one of the processes specified with ExecStartPre=, ExecStartPost=, ExecStop=, ExecStopPost=, or ExecReload=. When the death of the process is a result of systemd operation (e.g. service stop or restart), the service will not be restarted. Timeouts include missing the watchdog "keep-alive ping" deadline and a service start, reload, and stop operation timeouts.

Takes one of no, on-success, on-failure, on-abnormal, on-watchdog, on-abort, or always. If set to no (the default), the service will not be restarted. If set to on-success, it will be restarted only when the service process exits cleanly. In this context, a clean exit means any of the following:

• exit code of 0;
• for types other than Type=oneshot, one of the signals SIGHUP, SIGINT, SIGTERM, or SIGPIPE;
• exit statuses and signals specified in SuccessExitStatus=.

(emphasis mine)

My theory is that sudo shutdown now, or the Pi's power button, is sending a SIGTERM rather than a systemd stop command. I'm also still not convinced this isn't the kind of thing that makes debugging harder. I can imagine someone would write exit(0) thinking it would actually stop the program, and be surprised that it "didn't".