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GH-78079: Fix UNC device path root normalization in pathlib by barneygale · Pull Request #102003 · python/cpython · GitHub
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GH-78079: Fix UNC device path root normalization in pathlib #102003

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Merged
barneygale merged 10 commits into from
Apr 14, 2023
+43 −3
Merged

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

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99f62bc
GH-78079: Fix UNC device path root normalization in pathlib
barneygale Feb 2, 2023
6651b67
A few more test cases
barneygale Feb 20, 2023
87519ba
Merge branch 'main' into gh-78079-win-device-path-roots
barneygale Feb 20, 2023
c444a3c
Update Lib/pathlib.py
barneygale Mar 10, 2023
36623c0
Fix handling of UNC paths with incomplete drives in glob(), walk(), etc.
barneygale Mar 10, 2023
aea236e
Test handling of UNC paths with incomplete drives in joinpath()
barneygale Mar 10, 2023
bb0af91
Merge branch 'main' into gh-78079-win-device-path-roots
barneygale Mar 10, 2023
f412f87
Merge branch 'main' into gh-78079-win-device-path-roots
barneygale Apr 3, 2023
8ff07fc
Merge branch 'main' into gh-78079-win-device-path-roots
barneygale Apr 9, 2023
723a5aa
Merge branch 'main' into gh-78079-win-device-path-roots
barneygale Apr 11, 2023
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11 changes: 8 additions & 3 deletions Lib/pathlib.py
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Original file line number Diff line number Diff line change
Expand Up @@ -281,9 +281,14 @@ def _parse_parts(cls, parts):
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
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unfiltered_parsed = [drv + root] + rel.split(sep)
parsed = [sys.intern(x) for x in unfiltered_parsed if x and x != '.']
return drv, root, parsed
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8 changes: 8 additions & 0 deletions Lib/test/test_ntpath.py
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Expand Up @@ -168,6 +168,7 @@ def test_splitroot(self):

# gh-81790: support device namespace, including UNC drives.
tester('ntpath.splitroot("//?/c:")', ("//?/c:", "", ""))
tester('ntpath.splitroot("//./c:")', ("//./c:", "", ""))
tester('ntpath.splitroot("//?/c:/")', ("//?/c:", "/", ""))
tester('ntpath.splitroot("//?/c:/dir")', ("//?/c:", "/", "dir"))
tester('ntpath.splitroot("//?/UNC")', ("//?/UNC", "", ""))
Expand All @@ -178,8 +179,12 @@ def test_splitroot(self):
tester('ntpath.splitroot("//?/VOLUME{00000000-0000-0000-0000-000000000000}/spam")',
('//?/VOLUME{00000000-0000-0000-0000-000000000000}', '/', 'spam'))
tester('ntpath.splitroot("//?/BootPartition/")', ("//?/BootPartition", "/", ""))
tester('ntpath.splitroot("//./BootPartition/")', ("//./BootPartition", "/", ""))
tester('ntpath.splitroot("//./PhysicalDrive0")', ("//./PhysicalDrive0", "", ""))
tester('ntpath.splitroot("//./nul")', ("//./nul", "", ""))

tester('ntpath.splitroot("\\\\?\\c:")', ("\\\\?\\c:", "", ""))
tester('ntpath.splitroot("\\\\.\\c:")', ("\\\\.\\c:", "", ""))
tester('ntpath.splitroot("\\\\?\\c:\\")', ("\\\\?\\c:", "\\", ""))
tester('ntpath.splitroot("\\\\?\\c:\\dir")', ("\\\\?\\c:", "\\", "dir"))
tester('ntpath.splitroot("\\\\?\\UNC")', ("\\\\?\\UNC", "", ""))
Expand All @@ -192,6 +197,9 @@ def test_splitroot(self):
tester('ntpath.splitroot("\\\\?\\VOLUME{00000000-0000-0000-0000-000000000000}\\spam")',
('\\\\?\\VOLUME{00000000-0000-0000-0000-000000000000}', '\\', 'spam'))
tester('ntpath.splitroot("\\\\?\\BootPartition\\")', ("\\\\?\\BootPartition", "\\", ""))
tester('ntpath.splitroot("\\\\.\\BootPartition\\")', ("\\\\.\\BootPartition", "\\", ""))
tester('ntpath.splitroot("\\\\.\\PhysicalDrive0")', ("\\\\.\\PhysicalDrive0", "", ""))
tester('ntpath.splitroot("\\\\.\\nul")', ("\\\\.\\nul", "", ""))

# gh-96290: support partial/invalid UNC drives
tester('ntpath.splitroot("//")', ("//", "", "")) # empty server & missing share
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17 changes: 17 additions & 0 deletions Lib/test/test_pathlib.py
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Expand Up @@ -95,6 +95,9 @@ def test_parse_parts(self):
check(['c:/a'], ('c:', '\\', ['c:\\', 'a']))
check(['/a'], ('', '\\', ['\\', 'a']))
# UNC paths.
check(['//'], ('\\\\', '', ['\\\\']))
check(['//a'], ('\\\\a', '', ['\\\\a']))
check(['//a/'], ('\\\\a\\', '', ['\\\\a\\']))
check(['//a/b'], ('\\\\a\\b', '\\', ['\\\\a\\b\\']))
check(['//a/b/'], ('\\\\a\\b', '\\', ['\\\\a\\b\\']))
check(['//a/b/c'], ('\\\\a\\b', '\\', ['\\\\a\\b\\', 'c']))
Expand All @@ -108,12 +111,26 @@ def test_parse_parts(self):
# UNC paths.
check(['a', '//b/c//', 'd'], ('\\\\b\\c', '\\', ['\\\\b\\c\\', 'd']))
# Extended paths.
check(['//./c:'], ('\\\\.\\c:', '', ['\\\\.\\c:']))
check(['//?/c:/'], ('\\\\?\\c:', '\\', ['\\\\?\\c:\\']))
check(['//?/c:/a'], ('\\\\?\\c:', '\\', ['\\\\?\\c:\\', 'a']))
check(['//?/c:/a', '/b'], ('\\\\?\\c:', '\\', ['\\\\?\\c:\\', 'b']))
# Extended UNC paths (format is "\\?\UNC\server\share").
check(['//?'], ('\\\\?', '', ['\\\\?']))
check(['//?/'], ('\\\\?\\', '', ['\\\\?\\']))
check(['//?/UNC'], ('\\\\?\\UNC', '', ['\\\\?\\UNC']))
check(['//?/UNC/'], ('\\\\?\\UNC\\', '', ['\\\\?\\UNC\\']))
check(['//?/UNC/b'], ('\\\\?\\UNC\\b', '', ['\\\\?\\UNC\\b']))
check(['//?/UNC/b/'], ('\\\\?\\UNC\\b\\', '', ['\\\\?\\UNC\\b\\']))
check(['//?/UNC/b/c'], ('\\\\?\\UNC\\b\\c', '\\', ['\\\\?\\UNC\\b\\c\\']))
check(['//?/UNC/b/c/'], ('\\\\?\\UNC\\b\\c', '\\', ['\\\\?\\UNC\\b\\c\\']))
check(['//?/UNC/b/c/d'], ('\\\\?\\UNC\\b\\c', '\\', ['\\\\?\\UNC\\b\\c\\', 'd']))
# UNC device paths
check(['//./BootPartition/'], ('\\\\.\\BootPartition', '\\', ['\\\\.\\BootPartition\\']))
check(['//?/BootPartition/'], ('\\\\?\\BootPartition', '\\', ['\\\\?\\BootPartition\\']))
check(['//./PhysicalDrive0'], ('\\\\.\\PhysicalDrive0', '', ['\\\\.\\PhysicalDrive0']))
check(['//?/Volume{}/'], ('\\\\?\\Volume{}', '\\', ['\\\\?\\Volume{}\\']))
check(['//./nul'], ('\\\\.\\nul', '', ['\\\\.\\nul']))
# Second part has a root but not drive.
check(['a', '/b', 'c'], ('', '\\', ['\\', 'b', 'c']))
check(['Z:/a', '/b', 'c'], ('Z:', '\\', ['Z:\\', 'b', 'c']))
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3 changes: 3 additions & 0 deletions Misc/NEWS.d/next/Library/2023-02-17-21-14-40.gh-issue-78079.z3Szr6.rst
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@@ -0,0 +1,3 @@
Fix incorrect normalization of UNC device path roots, and partial UNC share
path roots, in :class:`pathlib.PurePath`. Pathlib no longer appends a
trailing slash to such paths.