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bpo-30028: make test.support.temp_cwd() fork-safe by akruis · Pull Request #1066 · python/cpython · GitHub
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bpo-30028: make test.support.temp_cwd() fork-safe #1066

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Merged
gpshead merged 8 commits into from
Feb 23, 2018
Merged

bpo-30028: make test.support.temp_cwd() fork-safe #1066

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22e032a
bpo-30028: make test.support.temp_cwd() fork-safe
Apr 9, 2017
7b96cf7
Update test_regrtest.py
Apr 10, 2017
9ca9665
bpo-30028: Add comments, move the test to test_support.py
Apr 10, 2017
1a0364d
bpo-30028: Run the fork test as an external script.
Apr 10, 2017
0f480d9
bpo-30028: replace assert by if ...: raise AssertionError
Apr 15, 2017
8cebac8
bpo-30028: improve the test case
Apr 22, 2017
1b78826
Merge branch 'master' into tempcwd_fork_fix
serhiy-storchaka Feb 21, 2018
ee34a5b
bpo-30028: Add name to Misc/ACKS
akruis Feb 22, 2018
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4 changes: 3 additions & 1 deletion Lib/test/support/__init__.py
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Original file line number Diff line number Diff line change
Expand Up @@ -960,10 +960,12 @@ def temp_dir(path=None, quiet=False):
warnings.warn(f'tests may fail, unable to create '
f'temporary directory {path!r}: {exc}',
RuntimeWarning, stacklevel=3)
if dir_created:
pid = os.getpid()
try:
yield path
finally:
if dir_created:
if dir_created and pid == os.getpid():

@vstinner vstinner Apr 10, 2017

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The test is non obvious, can you please add a short comment explaining why you test the pid?

I guess that it's test to avoid that two processes try to remove the directory if the parent uses fork()?

Add bpo-30028 in the comment.

rmtree(path)

@contextlib.contextmanager
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15 changes: 15 additions & 0 deletions Lib/test/test_regrtest.py
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Expand Up @@ -821,5 +821,20 @@ def test_crashed(self):
randomize=True)


class TempCwdTestCase(unittest.TestCase):

@vstinner vstinner Apr 10, 2017

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Please move this test to test_support.py which tests test.support.

test_regrtest tests Lib/test/libregrtest/.

@unittest.skipUnless(hasattr(os, "fork"), "test requires os.fork")
def test_forked_child(self):
import sys

@serhiy-storchaka serhiy-storchaka Apr 10, 2017

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Is it used?

@akruis akruis Apr 10, 2017

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Opps, a left over from a debug print to sys.stderr

with support.temp_cwd() as cwd:
pid = os.fork()
if pid != 0:
# parent
os.waitpid(pid, 0)
self.assertTrue(os.path.isdir(cwd), "directory was removed "+cwd)
if pid == 0:
# terminate the child in order to not confuse the test runner
os._exit(0)


if __name__ == '__main__':
unittest.main()