Daemonized OctoPrint doesn't clean up its pidfile when receiving a TERM signal

[rspeed]

1. What were you doing?

   Writing a rc.d script for FreeBSD.

2. What did you expect to happen?

   OctoPrint would clean up its pidfile after a graceful exit.

3. What happened instead?

   The pidfile remained in place. This caused an "already running" error to occur when I attempted to run the daemon again.

4. Branch & Commit or Version:

   devel 3d5fdf2

5. Printer model & used firmware incl. version

   Not relevant.

6. Link to octoprint.log on gist.github.com or pastebin.com:

   Not relevant.

7. Link to contents of terminal tab on gist.github.com or pastebin.com:

   https://gist.github.com/rspeed/d37acd6fc447eac1cb3e

Notes

The base issue is that daemon.py uses atexit, which states in its documentation:

The functions registered via this module are not called when the program is killed by a signal not handled by Python

Since SIGTERM is the standard POSIX way to ask a daemon to quit, and since daemons are supposed to clean up after themselves, this design requires unusual and fragile behavior in init scripts. Specifically, I noticed that the init script has this line:

rm -f $PIDFILE

That's generally considered to be a bad practice.

[GitIssueBot]

Hi @rspeed,

It looks like there is some information missing from your ticket that will be needed in order to process it properly. Please take a look at the Contribution Guidelines and the page How to file a bug report on the project wiki, which will tell you exactly what your ticket has to contain in order to be processable.

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I'm marking this one now as needing some more information. Please understand that if you do not provide that information within the next two weeks (until 2015-01-24 09:20) I'll close this ticket so it doesn't clutter the bug tracker.

Best regards,
~ Your friendly GitIssueBot

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[foosel]

Fixed through PR