New submission from Michael Felt <aixto...@felt.demon.nl>:

Two tests in test_pathlib test that the files created have mode o666 (rw-rw-rw).

However, on a filesystem (in my case NFS) configured to never permit global 
write - the test will always fail.

Is this something to be concerned about?

I can think of a few possible ways to react to an exception such as this, e.g., 
rather than 'FAIL' outright, try umask(2).


++++++++
======================================================================
FAIL: test_open_mode (test.test_pathlib.PosixPathTest)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/data/prj/python/src/py38-3.8.5/Lib/test/test_pathlib.py", line 2210, 
in test_open_mode
    self.assertEqual(stat.S_IMODE(st.st_mode), 0o666)
AssertionError: 436 != 438

======================================================================
FAIL: test_touch_mode (test.test_pathlib.PosixPathTest)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/data/prj/python/src/py38-3.8.5/Lib/test/test_pathlib.py", line 2223, 
in test_touch_mode
    self.assertEqual(stat.S_IMODE(st.st_mode), 0o666)
AssertionError: 436 != 438

----------------------------------------------------------------------
++++++++

Just to verify it does work when on a 'local' filesystem.

cp -rp build /tmp/build
mv build build.nfs
ln -s /tmp/build build

== Tests result: SUCCESS ==

1 test OK.

Total duration: 7.8 sec
Tests result: SUCCESS

----------
components: Tests
messages: 374725
nosy: Michael.Felt
priority: normal
severity: normal
status: open
title: test_pathlib assumes underlying filesystem permits creation with 
world-write permissions
type: behavior
versions: Python 3.10, Python 3.8, Python 3.9

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue41461>
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