8000 gh-108638: Fix stat.filemode() when _stat is missing by vstinner · Pull Request #108639 · python/cpython · GitHub
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gh-108638: Fix stat.filemode() when _stat is missing #108639

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Merged
merged 1 commit into from
Aug 29, 2023
Merged

gh-108638: Fix stat.filemode() when _stat is missing #108639

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gh-108638: Fix stat.filemode() when _stat is missing 
Change the pure Python implementation of stat.filemode() for unknown
file type: use "?", as done by the _stat.filemode().

test_stat skips TestFilemodeCStat if the _stat extension is missing.
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@vstinner
vstinner committed Aug 29, 2023
commit ce5c938b6b467b0802c8b88aefde6be33c073f86
10 changes: 8 additions & 2 deletions Lib/stat.py
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Original file line number Diff line number Diff line change
Expand Up @@ -126,6 +126,8 @@ def S_ISWHT(mode):


_filemode_table = (
# File type chars according to:
# http://en.wikibooks.org/wiki/C_Programming/POSIX_Reference/sys/stat.h
((S_IFLNK, "l"),
(S_IFSOCK, "s"), # Must appear before IFREG and IFDIR as IFSOCK == IFREG | IFDIR
(S_IFREG, "-"),
Expand Down Expand Up @@ -156,13 +158,17 @@ def S_ISWHT(mode):
def filemode(mode):
"""Convert a file's mode to a string of the form '-rwxrwxrwx'."""
perm = []
for table in _filemode_table:
for index, table in enumerate(_filemode_table):
for bit, char in table:
if mode & bit == bit:
perm.append(char)
break
else:
perm.append("-")
if index == 0:
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Suggested change
if index == 0:
if not perm:

And you can remove index.

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Oh right, feel free to write a follow-up PR if you want, sadly you reviewed the change just after it got merged automatically. I have not preference between enumerate() + if index == 0 and not perm.

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_stat.filemode() and stat.filemode() implementations are very different. I tried to write a minimum fix.

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Ah, so there is a _stat.filemode()? I noticed that the Python implementation always use constants defined in Python, even if they are overwritten by _stat later. I was not sure whether this is good or bad. On one hand, the original use case was for tar files, which can came from other systems. On other hand, it should work with local files.

# Unknown filetype
perm.append("?")
else:
perm.append("-")
return "".join(perm)


Expand Down
6 changes: 5 additions & 1 deletion Lib/test/test_stat.py
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Expand Up @@ -122,8 +122,11 @@ def test_mode(self):
st_mode, modestr = self.get_mode()
self.assertEqual(modestr, '-rwx------')
self.assertS_IS("REG", st_mode)
self.assertEqual(self.statmod.S_IMODE(st_mode),
imode = self.statmod.S_IMODE(st_mode)
self.assertEqual(imode,
self.statmod.S_IRWXU)
self.assertEqual(self.statmod.filemode(imode),
'?rwx------')

os.chmod(TESTFN, 0o070)
st_mode, modestr = self.get_mode()
Expand Down Expand Up @@ -238,6 +241,7 @@ def test_file_attribute_constants(self):
self.assertEqual(value, modvalue, key)


@unittest.skipIf(c_stat is None, 'need _stat extension')
class TestFilemodeCStat(TestFilemode, unittest.TestCase):
statmod = c_stat

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