Fix PIDFile= reference, restart latency in systemd service #252
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The run directory has been moved from /var/run to /run in systemd, which results in the following warning at boot: ``` /usr/lib/systemd/system/mbpfan.service:10: PIDFile= references a path below legacy directory /var/run/, updating /var/run/mbpfan.pid → /run/mbpfan.pid; please update the unit file accordingly. ``` Additionally, the service occasionally fails to start if the service is started before coretemp devices have finished probing, which results in the following error. This patch fixes this issue. ``` systemd[1]: Started A fan manager daemon for MacBook Pro. mbpfan[350]: /usr/sbin/mbpfan needs coretemp support. Please either load it or build it into the kernel. Exiting. systemd[1]: mbpfan.service: Main process exited, code=exited, status=1/FAILURE systemd[1]: mbpfan.service: Failed with result 'exit-code'. systemd[1]: mbpfan.service: Scheduled restart job, restart counter is at 1. systemd[1]: Stopped A fan manager daemon for MacBook Pro. systemd[1]: Started A fan manager daemon for MacBook Pro. mbpfan[369]: /usr/sbin/mbpfan needs coretemp support. Please either load it or build it into the kernel. Exiting. systemd[1]: mbpfan.service: Main process exited, code=exited, status=1/FAILURE systemd[1]: mbpfan.service: Failed with result 'exit-code'. systemd[1]: mbpfan.service: Scheduled restart job, restart counter is at 2. systemd[1]: Stopped A fan manager daemon for MacBook Pro. mbpfan[380]: /usr/sbin/mbpfan needs coretemp support. Please either load it or build it into the kernel. Exiting. systemd[1]: Started A fan manager daemon for MacBook Pro. systemd[1]: mbpfan.service: Main process exited, code=exited, status=1/FAILURE systemd[1]: mbpfan.service: Failed with result 'exit-code'. systemd[1]: mbpfan.service: Scheduled restart job, restart counter is at 3. mbpfan[393]: /usr/sbin/mbpfan needs coretemp support. Please either load it or build it into the kernel. Exiting. systemd[1]: Stopped A fan manager daemon for MacBook Pro. systemd[1]: Started A fan manager daemon for MacBook Pro. systemd[1]: mbpfan.service: Main process exited, code=exited, status=1/FAILURE systemd[1]: mbpfan.service: Failed with result 'exit-code'. systemd[1]: mbpfan.service: Scheduled restart job, restart counter is at 4. systemd[1]: Stopped A fan manager daemon for MacBook Pro. systemd[1]: Started A fan manager daemon for MacBook Pro. mbpfan[416]: /usr/sbin/mbpfan needs coretemp support. Please either load it or build it into the kernel. Exiting. systemd[1]: mbpfan.service: Main process exited, code=exited, status=1/FAILURE systemd[1]: mbpfan.service: Failed with result 'exit-code'. systemd[1]: mbpfan.service: Scheduled restart job, restart counter is at 5. systemd[1]: Stopped A fan manager daemon for MacBook Pro. systemd[1]: mbpfan.service: Start request repeated too quickly. systemd[1]: mbpfan.service: Failed with result 'exit-code'. systemd[1]: Failed to start A fan manager daemon for MacBook Pro. ```
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The run directory has been moved from /var/run to /run in systemd,
which results in the following warning at boot:
Additionally, the service occasionally fails to start if the service
is started before coretemp devices have finished probing, which results
in the following error. This patch fixes this issue.
With these small edits to the systemd service, the PID file now points to a location in the preferred directory, and the service is configured to schedule the next restart 1 second after the previous run, if it fails--this allows any devices to finish probing, and the service starts correctly the second time.