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python38/OBS_dev-shm.patch

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From 0edba4a774f8fc6867d49ebd2d9c6831901e30dd Mon Sep 17 00:00:00 2001
From: Victor Stinner <vstinner@python.org>
Date: Wed, 17 Jun 2020 17:53:48 +0200
Subject: [PATCH] bpo-38377: Add
support.skip_if_broken_multiprocessing_synchronize()
On Linux, skip tests using multiprocessing if the current user cannot
create a file in /dev/shm/ directory. Add the
skip_if_broken_multiprocessing_synchronize() function to the
test.support module.
---
Doc/library/test.rst | 8 +++++++
Lib/test/_test_multiprocessing.py | 2 +-
Lib/test/support/__init__.py | 22 +++++++++++++++++++
Lib/test/test_asyncio/test_events.py | 4 ++--
Lib/test/test_concurrent_futures.py | 2 +-
Lib/test/test_logging.py | 8 +++----
.../test_multiprocessing_main_handling.py | 2 +-
Lib/test/test_venv.py | 8 ++++---
.../2020-06-17-18-00-21.bpo-38377.jfg4TH.rst | 4 ++++
9 files changed, 48 insertions(+), 12 deletions(-)
create mode 100644 Misc/NEWS.d/next/Tests/2020-06-17-18-00-21.bpo-38377.jfg4TH.rst
--- a/Doc/library/test.rst
+++ b/Doc/library/test.rst
@@ -1282,6 +1282,14 @@ The :mod:`test.support` module defines t
.. versionadded:: 3.6
+.. function:: skip_if_broken_multiprocessing_synchronize()
+
+ Skip tests if the :mod:`multiprocessing.synchronize` module is missing, if
+ there is no available semaphore implementation, or if creating a lock raises
+ an :exc:`OSError`.
+
+ .. versionadded:: 3.10
+
The :mod:`test.support` module defines the following classes:
--- a/Lib/test/_test_multiprocessing.py
+++ b/Lib/test/_test_multiprocessing.py
@@ -31,7 +31,7 @@ from test import support
# Skip tests if _multiprocessing wasn't built.
_multiprocessing = test.support.import_module('_multiprocessing')
# Skip tests if sem_open implementation is broken.
-test.support.import_module('multiprocessing.synchronize')
+support.skip_if_broken_multiprocessing_synchronize()
import threading
import multiprocessing.connection
--- a/Lib/test/support/__init__.py
+++ b/Lib/test/support/__init__.py
@@ -3350,3 +3350,25 @@ class catch_threading_exception:
del self.exc_value
del self.exc_traceback
del self.thread
+
+def skip_if_broken_multiprocessing_synchronize():
+ """
+ Skip tests if the multiprocessing.synchronize module is missing, if there
+ is no available semaphore implementation, or if creating a lock raises an
+ OSError.
+ """
+
+ # Skip tests if the _multiprocessing extension is missing.
+ import_module('_multiprocessing')
+
+ # Skip tests if there is no available semaphore implementation:
+ # multiprocessing.synchronize requires _multiprocessing.SemLock.
+ synchronize = import_module('multiprocessing.synchronize')
+
+ try:
+ # bpo-38377: On Linux, creating a semaphore is the current user
+ # does not have the permission to create a file in /dev/shm.
+ # Create a semaphore to check permissions.
+ synchronize.Lock(ctx=None)
+ except OSError as exc:
+ raise unittest.SkipTest(f"broken multiprocessing SemLock: {exc!r}")
--- a/Lib/test/test_asyncio/test_events.py
+++ b/Lib/test/test_asyncio/test_events.py
@@ -2635,10 +2635,10 @@ class GetEventLoopTestsMixin:
if sys.platform != 'win32':
def test_get_event_loop_new_process(self):
- # Issue bpo-32126: The multiprocessing module used by
+ # bpo-32126: The multiprocessing module used by
# ProcessPoolExecutor is not functional when the
# multiprocessing.synchronize module cannot be imported.
- support.import_module('multiprocessing.synchronize')
+ support.skip_if_broken_multiprocessing_synchronize()
async def main():
pool = concurrent.futures.ProcessPoolExecutor()
--- a/Lib/test/test_concurrent_futures.py
+++ b/Lib/test/test_concurrent_futures.py
@@ -3,7 +3,7 @@ import test.support
# Skip tests if _multiprocessing wasn't built.
test.support.import_module('_multiprocessing')
# Skip tests if sem_open implementation is broken.
-test.support.import_module('multiprocessing.synchronize')
+test.support.skip_if_broken_multiprocessing_synchronize()
from test.support.script_helper import assert_python_ok
--- a/Lib/test/test_logging.py
+++ b/Lib/test/test_logging.py
@@ -3621,9 +3621,9 @@ if hasattr(logging.handlers, 'QueueListe
@patch.object(logging.handlers.QueueListener, 'handle')
def test_handle_called_with_mp_queue(self, mock_handle):
- # Issue 28668: The multiprocessing (mp) module is not functional
+ # bpo-28668: The multiprocessing (mp) module is not functional
# when the mp.synchronize module cannot be imported.
- support.import_module('multiprocessing.synchronize')
+ support.skip_if_broken_multiprocessing_synchronize()
for i in range(self.repeat):
log_queue = multiprocessing.Queue()
self.setup_and_log(log_queue, '%s_%s' % (self.id(), i))
@@ -3647,9 +3647,9 @@ if hasattr(logging.handlers, 'QueueListe
indicates that messages were not registered on the queue until
_after_ the QueueListener stopped.
"""
- # Issue 28668: The multiprocessing (mp) module is not functional
+ # bpo-28668: The multiprocessing (mp) module is not functional
# when the mp.synchronize module cannot be imported.
- support.import_module('multiprocessing.synchronize')
+ support.skip_if_broken_multiprocessing_synchronize()
for i in range(self.repeat):
queue = multiprocessing.Queue()
self.setup_and_log(queue, '%s_%s' %(self.id(), i))
--- a/Lib/test/test_multiprocessing_main_handling.py
+++ b/Lib/test/test_multiprocessing_main_handling.py
@@ -23,7 +23,7 @@ import multiprocessing
AVAILABLE_START_METHODS = set(multiprocessing.get_all_start_methods())
# Issue #22332: Skip tests if sem_open implementation is broken.
-support.import_module('multiprocessing.synchronize')
+support.skip_if_broken_multiprocessing_synchronize()
verbose = support.verbose
--- a/Lib/test/test_venv.py
+++ b/Lib/test/test_venv.py
@@ -16,7 +16,8 @@ import sys
import tempfile
from test.support import (captured_stdout, captured_stderr, requires_zlib,
can_symlink, EnvironmentVarGuard, rmtree,
- import_module)
+ import_module,
+ skip_if_broken_multiprocessing_synchronize)
import threading
import unittest
import venv
@@ -324,10 +325,11 @@ class BasicTest(BaseTest):
"""
Test that the multiprocessing is able to spawn.
"""
- # Issue bpo-36342: Instanciation of a Pool object imports the
+ # bpo-36342: Instantiation of a Pool object imports the
# multiprocessing.synchronize module. Skip the test if this module
# cannot be imported.
- import_module('multiprocessing.synchronize')
+ skip_if_broken_multiprocessing_synchronize()
+
rmtree(self.env_dir)
self.run_with_capture(venv.create, self.env_dir)
envpy = os.path.join(os.path.realpath(self.env_dir),
--- /dev/null
+++ b/Misc/NEWS.d/next/Tests/2020-06-17-18-00-21.bpo-38377.jfg4TH.rst
@@ -0,0 +1,4 @@
+On Linux, skip tests using multiprocessing if the current user cannot create
+a file in ``/dev/shm/`` directory. Add the
+:func:`~test.support.skip_if_broken_multiprocessing_synchronize` function to
+the :mod:`test.support` module.
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