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GH-78079: Fix UNC device path root normalization in pathlib (GH-102003)

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We no longer add a root to device paths such as `//./PhysicalDrive0`,
`//?/BootPartition` and `//./c:` while normalizing. We also avoid adding a
root to incomplete UNC share paths, like `//`, `//a` and `//a/`.

Co-authored-by: Eryk Sun <eryksun@gmail.com>
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Barney Gale 2023-04-14 21:55:41 +01:00 • committed by GitHub
parent 7c1b0a46c6
commit 8af8f52d17
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4 changed files with 43 additions and 3 deletions
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11
Lib/pathlib.py
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@ -322,9 +322,14 @@ class PurePath(object):
if altsep:
path = path.replace(altsep, sep)
drv, root, rel = cls._flavour.splitroot(path)
if drv.startswith(sep):
# pathlib assumes that UNC paths always have a root.
root = sep
if not root and drv.startswith(sep) and not drv.endswith(sep):
drv_parts = drv.split(sep)
if len(drv_parts) == 4 and drv_parts[2] not in '?.':
# e.g. //server/share
root = sep
elif len(drv_parts) == 6:
# e.g. //?/unc/server/share
root = sep
parsed = [sys.intern(str(x)) for x in rel.split(sep) if x and x != '.']
return drv, root, parsed