cdist configuration management
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59 lines
1.6 KiB
59 lines
1.6 KiB
# -*- coding: utf-8 -*- |
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# |
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# 2017 Darko Poljak (darko.poljak at gmail.com) |
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# |
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# This file is part of cdist. |
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# |
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# cdist 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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# cdist 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 cdist. If not, see <http://www.gnu.org/licenses/>. |
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# |
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# |
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import fcntl |
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import logging |
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import os |
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import cdist.log |
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log = logging.getLogger('cdist-flock') |
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class Flock(): |
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def __init__(self, path): |
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self.path = path |
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self.lockfd = None |
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def flock(self): |
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log.debug('Acquiring lock on %s', self.path) |
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self.lockfd = open(self.path, 'w+') |
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fcntl.flock(self.lockfd, fcntl.LOCK_EX) |
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log.debug('Acquired lock on %s', self.path) |
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def funlock(self): |
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log.debug('Releasing lock on %s', self.path) |
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fcntl.flock(self.lockfd, fcntl.LOCK_UN) |
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self.lockfd.close() |
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self.lockfd = None |
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try: |
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os.remove(self.path) |
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except FileNotFoundError: |
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pass |
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log.debug('Released lock on %s', self.path) |
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def __enter__(self): |
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self.flock() |
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return self |
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def __exit__(self, *args): |
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self.funlock() |
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return False
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