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launcher: daemonize and write PID file only after reading control options (-s/-R/-r)

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(cherry picked from commit b9a66244f0)
This commit is contained in:
James Lu 2018-03-30 23:23:10 -07:00
parent 9d21a5269f
commit 7dec2d15db
1 changed files with 36 additions and 33 deletions
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69
launcher.py
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@ -23,37 +23,6 @@ def _main():
from pylinkirc.log import log
from pylinkirc import classes, utils, coremods, selectdriver
world.daemon = args.daemonize
if args.daemonize:
if args.no_pid:
print('ERROR: Combining --no-pid and --daemonize is not supported.')
sys.exit(1)
elif os.name != 'posix':
print('ERROR: Daemonization is not supported outside POSIX systems.')
sys.exit(1)
else:
log.info('Forking into the background.')
log.removeHandler(world.console_handler)
# Adapted from https://stackoverflow.com/questions/5975124/
if os.fork():
# Fork and exit the parent process.
os._exit(0)
os.setsid() # Decouple from our lovely terminal
if os.fork():
# Fork again to prevent starting zombie apocalypses.
os._exit(0)
else:
# For foreground sessions, set the terminal window title.
# See https://bbs.archlinux.org/viewtopic.php?id=85567 &
# https://stackoverflow.com/questions/7387276/
if os.name == 'nt':
import ctypes
ctypes.windll.kernel32.SetConsoleTitleW("PyLink %s" % __version__)
elif os.name == 'posix':
sys.stdout.write("\x1b]2;PyLink %s\x07" % __version__)
# Write and check for an existing PID file unless specifically told not to.
if not args.no_pid:
pidfile = '%s.pid' % conf.confname
@ -103,6 +72,7 @@ def _main():
log.error("Alternatively, you can install psutil for Python 3 (pip3 install psutil), "
"which will allow this launcher to detect stale PID files and ignore them.")
sys.exit(1)
elif args.stop or args.restart or args.rehash: # XXX: also repetitive
# --stop and --restart should take care of stale PIDs.
if pid:
@ -112,12 +82,45 @@ def _main():
log.error('Cannot stop/rehash PyLink: PID file %r does not exist.', pidfile)
sys.exit(1)
with open(pidfile, 'w') as f:
f.write(str(os.getpid()))
world._should_remove_pid = True
log.info('PyLink %s starting...', __version__)
world.daemon = args.daemonize
if args.daemonize:
if args.no_pid:
print('ERROR: Combining --no-pid and --daemonize is not supported.')
sys.exit(1)
elif os.name != 'posix':
print('ERROR: Daemonization is not supported outside POSIX systems.')
sys.exit(1)
else:
log.info('Forking into the background.')
log.removeHandler(world.console_handler)
# Adapted from https://stackoverflow.com/questions/5975124/
if os.fork():
# Fork and exit the parent process.
os._exit(0)
os.setsid() # Decouple from our lovely terminal
if os.fork():
# Fork again to prevent starting zombie apocalypses.
os._exit(0)
else:
# For foreground sessions, set the terminal window title.
# See https://bbs.archlinux.org/viewtopic.php?id=85567 &
# https://stackoverflow.com/questions/7387276/
if os.name == 'nt':
import ctypes
ctypes.windll.kernel32.SetConsoleTitleW("PyLink %s" % __version__)
elif os.name == 'posix':
sys.stdout.write("\x1b]2;PyLink %s\x07" % __version__)
# Write the PID file only after forking.
with open(pidfile, 'w') as f:
f.write(str(os.getpid()))
# Load configured plugins
to_load = conf.conf['plugins']
utils._reset_module_dirs()