102 lines
2.7 KiB
Python
102 lines
2.7 KiB
Python
#!/usr/bin/python3
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# LEDD Project
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# Copyright (C) 2015 LEDD Team
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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"""LedD Daemon
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Usage:
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ledd.py [--detach] [-d | --debug] [-v | --verbose]
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ledd.py -h | --help
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ledd.py --version
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Options:
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-h --help Show this screen.
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--version Show version.
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-d --debug Show debug output. (not recommended)
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-v --verbose Be verbose.
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--detach Detach after start.
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"""
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import logging
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import os
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import sys
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from docopt import docopt
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import ledd
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import ledd.daemon
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def pid_exists(processid):
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if processid < 0:
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return False
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try:
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os.kill(processid, 0)
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except ProcessLookupError:
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return False
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except PermissionError:
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return True
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else:
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return True
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if __name__ == "__main__":
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arguments = docopt(__doc__, version='LedD Daemon ' + ledd.VERSION)
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lvl = logging.WARNING
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if arguments['--verbose']:
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lvl = logging.INFO
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if arguments['--debug']:
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lvl = logging.DEBUG
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log = logging.getLogger(__name__)
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try:
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with open('ledd.pid', 'r') as f:
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spid = f.read()
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if spid:
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if pid_exists(int(spid)):
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log.fatal("A instance of the program is already running, exiting...")
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sys.exit(5)
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else:
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log.warning("Found stale pid file, assuming unclean shutdown.")
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except FileNotFoundError:
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pass
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if arguments['--detach']:
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wdir = os.path.dirname(os.path.realpath(__file__))
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try:
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pid = os.fork()
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if pid == 0:
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os.setsid()
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pid2 = os.fork()
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if pid2 == 0:
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os.umask(0)
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os.chdir(wdir)
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with open("ledd.pid", 'w') as pidf:
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pidf.write(str(os.getpid()) + '\n')
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ledd.daemon.run()
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else:
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sys.exit()
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else:
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sys.exit()
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except OSError as e:
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log.fatal("Start failed: %s", e)
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else:
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ledd.daemon.run()
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