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# -*- coding: utf-8 -*-
# Copyright (C) 2012-2018 Red Hat, Inc.
#
# This copyrighted material is made available to anyone wishing to use,
# modify, copy, or redistribute it subject to the terms and conditions of
# the GNU General Public License v.2, or (at your option) any later version.
# This program is distributed in the hope that it will be useful, but WITHOUT
# ANY WARRANTY expressed or implied, including the implied warranties 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. Any Red Hat trademarks that are incorporated in the
# source code or documentation are not subject to the GNU General Public
# License and may only be used or replicated with the express permission of
# Red Hat, Inc.
#
"""Unit test dnf.lock module.
Locking is very hard to cover reasonably with a unit test, this is more or less
just a sanity check.
"""
from __future__ import absolute_import
from __future__ import unicode_literals
import multiprocessing
import os
import re
import threading
import dnf.lock
import dnf.pycomp
import dnf.util
from dnf.exceptions import ProcessLockError, ThreadLockError
import tests.support
from tests.support import mock
# The tests here are not compatible with the forkserver method,
# which is the default on Python 3.14+.
# See https://github.com/python/cpython/issues/125714
if multiprocessing.get_start_method() == 'forkserver':
mp_context = multiprocessing.get_context(method='fork')
else:
mp_context = multiprocessing.get_context()
class ConcurrencyMixin(object):
def __init__(self, lock):
self.lock = lock
def run(self):
try:
with self.lock:
pass
except (ProcessLockError, ThreadLockError) as e:
self.queue.put(e)
class OtherThread(ConcurrencyMixin, threading.Thread):
def __init__(self, lock):
ConcurrencyMixin.__init__(self, lock)
threading.Thread.__init__(self)
self.queue = dnf.pycomp.Queue(1)
class OtherProcess(ConcurrencyMixin, mp_context.Process):
def __init__(self, lock):
ConcurrencyMixin.__init__(self, lock)
mp_context.Process.__init__(self)
self.queue = mp_context.Queue(1)
TARGET = os.path.join(tests.support.USER_RUNDIR, 'unit-test.pid')
def build_lock(blocking=False):
return dnf.lock.ProcessLock(TARGET, 'unit-tests', blocking)
class LockTest(tests.support.TestCase):
def test_fit_lock_dir(self):
orig = '/some'
with mock.patch('dnf.util.am_i_root', return_value=True):
self.assertEqual(dnf.lock._fit_lock_dir(orig), '/some')
with mock.patch('dnf.util.am_i_root', return_value=False):
dir_ = dnf.lock._fit_lock_dir(orig)
match = re.match(
r'/var/tmp/dnf-[^:]+-[^/]+/locks/2690814ff0269c86e5109d2915ea572092918cb3',
dir_)
self.assertTrue(match)
class ProcessLockTest(tests.support.TestCase):
@classmethod
def tearDownClass(cls):
dnf.util.rm_rf(tests.support.USER_RUNDIR)
def test_simple(self):
l1 = build_lock()
target = l1.target
with l1:
self.assertFile(target)
self.assertPathDoesNotExist(target)
def test_reentrance(self):
l1 = build_lock()
with l1:
with l1:
pass
def test_another_process(self):
l1 = build_lock()
process = OtherProcess(l1)
with l1:
process.start()
process.join()
self.assertIsInstance(process.queue.get(), ProcessLockError)
def test_another_process_blocking(self):
l1 = build_lock(blocking=True)
l2 = build_lock(blocking=True)
process = OtherProcess(l1)
target = l1.target
with l2:
process.start()
process.join()
self.assertEqual(process.queue.empty(), True)
self.assertPathDoesNotExist(target)
def test_another_thread(self):
l1 = build_lock()
thread = OtherThread(l1)
with l1:
thread.start()
thread.join()
self.assertIsInstance(thread.queue.get(), ThreadLockError)
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