/usr/share/pyshared/smart/util/pathlocks.py is in python-smartpm 1.4-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# Copyright (c) 2004 Conectiva, Inc.
#
# Written by Gustavo Niemeyer <niemeyer@conectiva.com>
#
# This file is part of Smart Package Manager.
#
# Smart Package Manager is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License as published
# by the Free Software Foundation; either version 2 of the License, or (at
# your option) any later version.
#
# Smart Package Manager is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with Smart Package Manager; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
#
import fcntl
import os
class PathLocks(object):
def __init__(self, force=True):
self._lock = {}
self._force = bool(force)
def getForce(self):
return self._force
def setForce(self, flag):
self._force = flag
def __del__(self):
# fcntl module may be destructed before we are.
if fcntl: self.unlockAll()
def unlockAll(self):
for path in self._lock:
fd = self._lock[path]
fcntl.flock(fd, fcntl.LOCK_UN)
os.close(fd)
self._lock.clear()
def unlock(self, path):
result = self._force
fd = self._lock.get(path)
if fd is not None:
fcntl.flock(fd, fcntl.LOCK_UN)
os.close(fd)
del self._lock[path]
result = True
return result
def lock(self, path, exclusive=False, block=False):
result = self._force
fd = self._lock.get(path)
if fd is None:
fd = self._lock[path] = os.open(path, os.O_RDONLY)
flags = fcntl.fcntl(fd, fcntl.F_GETFD, 0)
flags |= fcntl.FD_CLOEXEC
fcntl.fcntl(fd, fcntl.F_SETFD, flags)
if exclusive:
flags = fcntl.LOCK_EX
else:
flags = fcntl.LOCK_SH
if not block:
flags |= fcntl.LOCK_NB
try:
fcntl.flock(fd, flags)
result = True
except IOError, e:
pass
return result
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