/usr/share/nsscache/nss_cache/lock_test.py is in nsscache 0.29-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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#
# This program 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.
#
# This program 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 this program; if not, write to the Free Software Foundation,
# Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
"""Unit tests for nss_cache/lock.py."""
__author__ = 'vasilios@google.com (Vasilios Hoffman)'
import __builtin__
import errno
import fcntl
import os
import re
import shutil
import signal
import stat
import sys
import tempfile
import unittest
import mox
from nss_cache import lock
class TestPidFile(mox.MoxTestBase):
"""Unit tests for PidFile class in lock.py."""
# Note that we do not test whether fcntl actually works as expected.
# That is outside the scope of unit tests and I'm not going to fork
# a child to test this, at least not now.
#
# Rest assured, it works as expected and fcntl throws an exception if
# another process has the lock.
#
# We also do not test if os.kill works as expected :)
def setUp(self):
super(TestPidFile, self).setUp()
self.workdir = tempfile.mkdtemp()
self.filename = '%s/%s' % (self.workdir, 'pidfile')
def tearDown(self):
shutil.rmtree(self.workdir)
super(TestPidFile, self).tearDown()
def testInit(self):
locker = lock.PidFile()
pid = os.getpid()
filename = os.path.basename(sys.argv[0])
filename = '%s/%s' % (locker.STATE_DIR, filename)
self.assertTrue(isinstance(locker, lock.PidFile))
self.assertEquals(locker.pid, pid)
self.assertEquals(locker.filename, filename)
self.assertEquals(locker._locked, False)
self.assertEquals(locker._file, None)
# also check the case where argv[0] is empty (interactively loaded)
full_path = sys.argv[0]
sys.argv[0] = ''
self.assertRaises(TypeError, lock.PidFile)
sys.argv[0] = full_path
def testHandleArgumentsProperly(self):
filename = 'TEST'
pid = 10
locker = lock.PidFile(filename=filename, pid=pid)
self.assertEquals(locker.filename, filename)
self.assertEquals(locker.pid, pid)
def testDestructorUnlocks(self):
yes = lock.PidFile()
self.mox.StubOutWithMock(yes, 'Locked')
self.mox.StubOutWithMock(yes, 'Unlock')
yes.Locked().AndReturn(True)
yes.Unlock()
no = lock.PidFile()
self.mox.StubOutWithMock(no, 'Locked')
no.Locked().AndReturn(False)
self.mox.ReplayAll()
# test the case where locked returns True.
yes.__del__()
# test the case where self.Locked() returns False.
no.__del__()
def testOpenCreatesAppropriateFileWithPerms(self):
locker = lock.PidFile(filename=self.filename)
locker._Open()
self.assertTrue(os.path.exists(self.filename))
file_mode = os.stat(self.filename)[stat.ST_MODE]
correct_mode = (stat.S_IFREG | stat.S_IRUSR | stat.S_IWUSR | stat.S_IRGRP
| stat.S_IROTH)
self.assertEquals(file_mode, correct_mode)
os.remove(self.filename)
def testLockCreatesPidfiles(self):
locker = lock.PidFile()
self.mox.StubOutWithMock(locker, '_Open')
locker._Open().AndRaise(NotImplementedError)
self.mox.ReplayAll()
self.assertRaises(NotImplementedError, locker.Lock)
# Note that testing when self._file is not None is covered below.
def testLockLocksWithFcntl(self):
locker = lock.PidFile(pid='PID')
self.mox.StubOutWithMock(locker, '_file')
locker._file.truncate()
locker._file.write('PID\n')
locker._file.flush()
self.mox.StubOutWithMock(fcntl, 'lockf')
fcntl.lockf(locker._file, fcntl.LOCK_EX | fcntl.LOCK_NB)
self.mox.ReplayAll()
locker.Lock()
self.assertTrue(locker._locked)
# force __del__ to skip Unlock()
locker._locked = False
def testLockStoresPid(self):
locker = lock.PidFile(filename=self.filename, pid='PID')
locker.Lock()
pid_file = open(self.filename, 'r')
self.assertEquals(pid_file.read(), 'PID\n')
os.remove(self.filename)
def testLockTrapsPermissionDeniedOnly(self):
locker = lock.PidFile()
self.mox.StubOutWithMock(locker, '_Open')
locker._Open().AndRaise(IOError(errno.EACCES, ''))
locker._Open().AndRaise(IOError(errno.EIO, ''))
self.mox.ReplayAll()
self.assertEquals(False, locker.Lock())
self.assertRaises(IOError, locker.Lock)
def testForceLockTerminatesAndClearsLock(self):
locker = lock.PidFile(pid='PID')
self.mox.StubOutWithMock(locker, 'SendTerm')
locker.SendTerm()
self.mox.StubOutWithMock(locker, 'ClearLock')
locker.ClearLock()
self.mox.StubOutWithMock(locker, '_file')
self.mox.StubOutWithMock(fcntl, 'lockf')
fcntl.lockf(locker._file,
fcntl.LOCK_EX | fcntl.LOCK_NB).AndRaise(
IOError(fcntl.F_GETSIG, ''))
fcntl.lockf(locker._file,
fcntl.LOCK_EX | fcntl.LOCK_NB).AndRaise(
IOError(fcntl.F_GETSIG, ''))
self.mox.ReplayAll()
# This is a little weird due to recursion.
# The first time through lockf throws an error and we retry the lock.
# The 2nd time through we should fail, because lockf will still throw
# an error, so we expect False back and the above mock objects
# invoked.
self.assertFalse(locker.Lock(force=True))
def testSendTermMatchesCommandAndSendsTerm(self):
locker = lock.PidFile()
self.mox.StubOutWithMock(locker, '_file')
locker._file.read().AndReturn('1234')
locker._file.seek(0)
# Mock used in place of an re.compile() pattern -- expects the contents
# of our proc_file!
mock_re = self.mox.CreateMockAnything()
mock_re.match('TEST').AndReturn(True)
self.mox.StubOutWithMock(re, 'compile')
re.compile('.*nsscache').AndReturn(mock_re)
self.mox.StubOutWithMock(os, 'kill')
os.kill(1234, signal.SIGTERM)
# Create a file we open() in SendTerm().
proc_dir = '%s/1234' % self.workdir
proc_filename = '%s/cmdline' % proc_dir
os.mkdir(proc_dir)
proc_file = open(proc_filename, 'w')
proc_file.write('TEST')
proc_file.flush()
proc_file.close()
locker.PROC_DIR = self.workdir
self.mox.ReplayAll()
locker.SendTerm()
os.remove(proc_filename)
os.rmdir(proc_dir)
def testSendTermNoPid(self):
locker = lock.PidFile()
self.mox.StubOutWithMock(locker, '_file')
locker._file.read().AndReturn('\n')
locker.PROC = self.workdir
self.mox.ReplayAll()
locker.SendTerm()
def testSendTermNonePid(self):
locker = lock.PidFile()
self.mox.StubOutWithMock(locker, '_file')
locker._file.read().AndReturn(None)
locker.PROC = self.workdir
self.mox.ReplayAll()
locker.SendTerm()
def testSendTermTrapsENOENT(self):
locker = lock.PidFile()
self.mox.StubOutWithMock(locker, '_file')
locker._file.read().AndReturn('1234\n')
locker._file.seek(0)
locker.PROC = self.workdir
self.mox.StubOutWithMock(__builtin__, 'open')
__builtin__.open(mox.IgnoreArg(), 'r').AndRaise(IOError(errno.ENOENT, ''))
self.mox.ReplayAll()
# self.workdir/1234/cmdline should not exist :)
self.failIf(os.path.exists('%s/1234/cmdline' % self.workdir))
locker.SendTerm()
def testClearLockRemovesPidFile(self):
# Create a pid file.
pidfile = open(self.filename, 'w')
pidfile.write('foo')
pidfile.flush()
locker = lock.PidFile(filename=self.filename)
# Cheat instead of calling open.
locker._file = pidfile
locker.ClearLock()
self.failIf(os.path.exists(self.filename))
def testLockedPredicate(self):
locker = lock.PidFile()
locker._locked = True
self.assertTrue(locker.Locked())
locker._locked = False
self.failIf(locker.Locked())
def testUnlockReleasesFcntlLock(self):
locker = lock.PidFile()
locker._file = 'FILE_OBJECT'
self.mox.StubOutWithMock(fcntl, 'lockf')
fcntl.lockf('FILE_OBJECT', fcntl.LOCK_UN)
self.mox.ReplayAll()
locker.Unlock()
self.failIf(locker._locked)
if __name__ == '__main__':
unittest.main()
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