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Code Editor : ve_lock.py
#!/usr/bin/python # coding=utf-8 # # Copyright © Cloud Linux GmbH & Cloud Linux Software, Inc 2010-2019 All Rights Reserved # # Licensed under CLOUD LINUX LICENSE AGREEMENT # http://cloudlinux.com/docs/LICENSE.TXT import fcntl import os from contextlib import contextmanager CONFIG_DIR = '/etc/container' LOCK_FILE = os.path.join(CONFIG_DIR, '.ve.cfg.lock') # TODO: probably should be encapsulated LOCK_FD = None LOCK_WRITE = False class LockFailedException(Exception): pass def setup_global_lock(write=False): global LOCK_FD global LOCK_WRITE if LOCK_FD is not None: return False if write: LOCK_WRITE = True try: LOCK_FD = open(LOCK_FILE, 'a+', encoding='utf-8') # pylint: disable=consider-using-with fcntl.flock(LOCK_FD.fileno(), fcntl.LOCK_EX) except IOError as e: raise LockFailedException("IO error happened while getting lock") from e LOCK_FD.seek(0, 0) LOCK_FD.truncate() LOCK_FD.write(str(os.getpid())) LOCK_FD.flush() return True def release_lock(): global LOCK_FD # write locks released only on process exit if LOCK_WRITE: return False if LOCK_FD is not None: LOCK_FD.close() LOCK_FD = None return True @contextmanager def acquire_lock(write=False): """ Usage: with acquire_lock(): ... do something with ve.cfg ... """ setup_global_lock(write) yield release_lock()
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