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gh-83714: Fix os.statx() tests on tmpfs: st_birthtime can be None by vstinner · Pull Request #140407 · python/cpython · GitHub

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gh-83714: Fix os.statx() tests on tmpfs: st_birthtime can be None #140407

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Merged
vstinner merged 1 commit into from
Oct 21, 2025
Conversation 0 Commits 1 Checks 47 Files changed
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gh-83714: Fix os.statx() tests on tmpfs: st_birthtime can be None #140407

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17 changes: 11 additions & 6 deletions Lib/test/test_os/test_os.py
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Original file line number Diff line number Diff line change
Expand Up @@ -648,9 +648,10 @@ def check_timestamp_agreement(self, result, names):
# Make sure that the st_?time and st_?time_ns fields roughly agree
# (they should always agree up to around tens-of-microseconds)
for name in names:
floaty = int(getattr(result, name) * 100_000)
nanosecondy = getattr(result, name + "_ns") // 10_000
self.assertAlmostEqual(floaty, nanosecondy, delta=2, msg=name)
with self.subTest(name=name):
floaty = int(getattr(result, name) * 100_000)
nanosecondy = getattr(result, name + "_ns") // 10_000
self.assertAlmostEqual(floaty, nanosecondy, delta=2, msg=name)

def check_stat_attributes(self, fname):
result = os.stat(fname)
Expand Down Expand Up @@ -741,14 +742,19 @@ def test_stat_result_pickle(self):
unpickled = pickle.loads(p)
self.assertEqual(result, unpickled)

def check_statx_attributes(self, fname):
def check_statx_attributes(self, filename):
maximal_mask = 0
for name in dir(os):
if name.startswith('STATX_'):
maximal_mask |= getattr(os, name)
result = os.statx(self.fname, maximal_mask)
result = os.statx(filename, maximal_mask)
basic_result = os.stat(filename)

time_attributes = ('st_atime', 'st_mtime', 'st_ctime', 'st_birthtime')
# gh-83714: st_birthtime can be None on tmpfs even if STATX_BTIME mask
# is used
time_attributes = [name for name in time_attributes
if getattr(result, name) is not None]
self.check_timestamp_agreement(result, time_attributes)

# Check that valid attributes match os.stat.
Expand All @@ -773,7 +779,6 @@ def check_statx_attributes(self, fname):
('st_rdev', 0),
('st_dev', 0),
)
basic_result = os.stat(self.fname)
for name, bits in requirements:
if result.stx_mask & bits == bits and hasattr(basic_result, name):
x = getattr(result, name)
Expand Down
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