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Attempt to verify the PID in an existing PID file before giving up.

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If the PID doesn't map to a running process, then we can simply ignore the presence of the PID file and overwrite it with the current (new) PID later.
This commit is contained in:
spolyack 2016-09-18 11:36:09 -04:00
parent 95ce293169
commit 465add46d4
1 changed files with 15 additions and 2 deletions
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17
PlexPy.py
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@ -122,8 +122,21 @@ def main():
# If the pidfile already exists, plexpy may still be running, so
# exit
if os.path.exists(plexpy.PIDFILE):
raise SystemExit("PID file '%s' already exists. Exiting." %
plexpy.PIDFILE)
try:
with open(plexpy.PIDFILE, 'r') as fp:
pid = int(fp.read())
os.kill(pid, 0)
except IOError as e:
raise SystemExit("Unable to read PID file: %s", e)
except OSError:
logger.warn("PID file '%s' already exists, but PID %d is " \
"not running. Ignoring PID file." %
(plexpy.PIDFILE, pid))
else:
# The pidfile exists and points to a live PID. plexpy may
# still be running, so exit.
raise SystemExit("PID file '%s' already exists. Exiting." %
plexpy.PIDFILE)
# The pidfile is only useful in daemon mode, make sure we can write the
# file properly