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gh-117394: Speed up os.path.ismount() on Posix (GH-117447)

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It is now 2-3 times faster if the user has permissions.
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Serhiy Storchaka 2024-04-17 12:58:19 +03:00 • committed by GitHub
parent 51132da0c4
commit 4e502a4997
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2 changed files with 7 additions and 3 deletions
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9
Lib/posixpath.py
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@ -206,11 +206,14 @@ def ismount(path):
parent = join(path, b'..')
else:
parent = join(path, '..')
parent = realpath(parent)
try:
s2 = os.lstat(parent)
except (OSError, ValueError):
return False
except OSError:
parent = realpath(parent)
try:
s2 = os.lstat(parent)
except OSError:
return False
# path/.. on a different device as path or the same i-node as path
return s1.st_dev != s2.st_dev or s1.st_ino == s2.st_ino