From rosuav at gmail.com  Tue Aug 22 02:08:21 2017
From: rosuav at gmail.com (Chris Angelico)
Date: Tue, 22 Aug 2017 16:08:21 +1000
Subject: [Python-buildbots] Buildbot won't restart if blank pidfile exists
Message-ID: <CAPTjJmq8L7k85zO8B0Yp0sVvkhqg9hTf=Z7p+0QXeht2T_U=-g@mail.gmail.com>

Just came across a weird problem. Not sure if it's something to raise
here or elsewhere.

My buildslave got aborted due to a host reboot, but after resetting
everything, I was unable to run "buildslave restart" as I normally
did. It crashed out with 'invalid literal for int() with base 10'
trying to parse an empty string as "pid = int(f.read().strip())".
(Can't copy and paste from the VM, sorry - full traceback would be
quite tedious.) Attempting "buildslave start" timed out after ten
seconds, probably for the same reason (I didn't actually check
though). Turns out that having an empty twistd.pid file prevents
restart; removing this file made everything work perfectly. Seemed
very odd.

ChrisA