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GH-80486: Fix handling of NTFS alternate data streams in pathlib by barneygale · Pull Request #102454 · python/cpython · GitHub

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GH-80486: Fix handling of NTFS alternate data streams in pathlib #102454

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Merged
zooba merged 12 commits into from
Mar 10, 2023
Conversation 20 Commits 12 Checks 0 Files changed
Merged

GH-80486: Fix handling of NTFS alternate data streams in pathlib #102454

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15aadf9
Fixed bugs with drive-relative paths and NTFS ADS paths in pathlib
kmaork Mar 15, 2019
c827f98
Merge branch 'master' into fix-issue-36305
kmaork Jan 16, 2020
64fc342
Merge branch 'master' into fix-issue-36305
kmaork Feb 29, 2020
86c0408
Undo pathlib changes
barneygale Feb 22, 2023
c08602b
Merge branch 'main' into gh-80486-ntfs-alt-stream-path
barneygale Mar 6, 2023
cb9ce9d
Remove a couple of incorrect test cases
barneygale Mar 6, 2023
fe5cfb3
Fix `_format_parsed_parts()`
barneygale Mar 6, 2023
bc225f5
Restore deleted test case.
barneygale Mar 6, 2023
9aa4077
Fix expanduser()
barneygale Mar 6, 2023
0be2dc4
Use `_from_parsed_parts()` in `expanduser()`
barneygale Mar 6, 2023
8386140
Improve news blurb.
barneygale Mar 6, 2023
e6f11d4
Remove test case affected by GH-102475.
barneygale Mar 6, 2023
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8 changes: 5 additions & 3 deletions Lib/pathlib.py
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Original file line number Diff line number Diff line change
Expand Up @@ -320,8 +320,9 @@ def _from_parsed_parts(cls, drv, root, parts):
def _format_parsed_parts(cls, drv, root, parts):
if drv or root:
return drv + root + cls._flavour.sep.join(parts[1:])
else:
return cls._flavour.sep.join(parts)
elif parts and cls._flavour.splitdrive(parts[0])[0]:
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parts = ['.'] + parts
return cls._flavour.sep.join(parts)

def __str__(self):
"""Return the string representation of the path, suitable for
Expand Down Expand Up @@ -1188,7 +1189,8 @@ def expanduser(self):
homedir = self._flavour.expanduser(self._parts[0])
if homedir[:1] == "~":
raise RuntimeError("Could not determine home directory.")
return self._from_parts([homedir] + self._parts[1:])
drv, root, parts = self._parse_parts((homedir,))
return self._from_parsed_parts(drv, root, parts + self._parts[1:])

return self

Expand Down
28 changes: 27 additions & 1 deletion Lib/test/test_pathlib.py
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Expand Up @@ -122,6 +122,13 @@ def test_parse_parts(self):
# the second path is relative.
check(['c:/a/b', 'c:x/y'], ('c:', '\\', ['c:\\', 'a', 'b', 'x', 'y']))
check(['c:/a/b', 'c:/x/y'], ('c:', '\\', ['c:\\', 'x', 'y']))
# Paths to files with NTFS alternate data streams
check(['./c:s'], ('', '', ['c:s']))
check(['cc:s'], ('', '', ['cc:s']))
check(['C:c:s'], ('C:', '', ['C:', 'c:s']))
check(['C:/c:s'], ('C:', '\\', ['C:\\', 'c:s']))
check(['D:a', './c:b'], ('D:', '', ['D:', 'a', 'c:b']))
check(['D:/a', './c:b'], ('D:', '\\', ['D:\\', 'a', 'c:b']))


#
Expand Down Expand Up @@ -165,6 +172,7 @@ def test_constructor_common(self):
self.assertEqual(P(P('a'), 'b'), P('a/b'))
self.assertEqual(P(P('a'), P('b')), P('a/b'))
self.assertEqual(P(P('a'), P('b'), P('c')), P(FakePath("a/b/c")))
self.assertEqual(P(P('./a:b')), P('./a:b'))

def test_bytes(self):
P = self.cls
Expand Down Expand Up @@ -814,7 +822,8 @@ class PureWindowsPathTest(_BasePurePathTest, unittest.TestCase):

equivalences = _BasePurePathTest.equivalences.copy()
equivalences.update({
'c:a': [ ('c:', 'a'), ('c:', 'a/'), ('/', 'c:', 'a') ],
'./a:b': [ ('./a:b',) ],
'c:a': [ ('c:', 'a'), ('c:', 'a/'), ('.', 'c:', 'a') ],
'c:/a': [
('c:/', 'a'), ('c:', '/', 'a'), ('c:', '/a'),
('/z', 'c:/', 'a'), ('//x/y', 'c:/', 'a'),
Expand All @@ -838,6 +847,7 @@ def test_str(self):
self.assertEqual(str(p), '\\\\a\\b\\c\\d')

def test_str_subclass(self):
self._check_str_subclass('.\\a:b')
self._check_str_subclass('c:')
self._check_str_subclass('c:a')
self._check_str_subclass('c:a\\b.txt')
Expand Down Expand Up @@ -1005,6 +1015,7 @@ def test_drive(self):
self.assertEqual(P('//a/b').drive, '\\\\a\\b')
self.assertEqual(P('//a/b/').drive, '\\\\a\\b')
self.assertEqual(P('//a/b/c/d').drive, '\\\\a\\b')
self.assertEqual(P('./c:a').drive, '')

def test_root(self):
P = self.cls
Expand Down Expand Up @@ -1341,6 +1352,14 @@ def test_join(self):
self.assertEqual(pp, P('C:/a/b/x/y'))
pp = p.joinpath('c:/x/y')
self.assertEqual(pp, P('C:/x/y'))
# Joining with files with NTFS data streams => the filename should
# not be parsed as a drive letter
pp = p.joinpath(P('./d:s'))
self.assertEqual(pp, P('C:/a/b/d:s'))
pp = p.joinpath(P('./dd:s'))
self.assertEqual(pp, P('C:/a/b/dd:s'))
pp = p.joinpath(P('E:d:s'))
self.assertEqual(pp, P('E:d:s'))

def test_div(self):
# Basically the same as joinpath().
Expand All @@ -1361,6 +1380,11 @@ def test_div(self):
# the second path is relative.
self.assertEqual(p / 'c:x/y', P('C:/a/b/x/y'))
self.assertEqual(p / 'c:/x/y', P('C:/x/y'))
# Joining with files with NTFS data streams => the filename should
# not be parsed as a drive letter
self.assertEqual(p / P('./d:s'), P('C:/a/b/d:s'))
self.assertEqual(p / P('./dd:s'), P('C:/a/b/dd:s'))
self.assertEqual(p / P('E:d:s'), P('E:d:s'))

def test_is_reserved(self):
P = self.cls
Expand Down Expand Up @@ -1626,6 +1650,8 @@ def test_expanduser_common(self):
self.assertEqual(p.expanduser(), p)
p = P(P('').absolute().anchor) / '~'
self.assertEqual(p.expanduser(), p)
p = P('~/a:b')
self.assertEqual(p.expanduser(), P(os.path.expanduser('~'), './a:b'))

def test_exists(self):
P = self.cls
Expand Down
2 changes: 2 additions & 0 deletions Misc/NEWS.d/next/Library/2019-03-15-22-50-27.bpo-36305.Pbkv6u.rst
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@@ -0,0 +1,2 @@
Fix handling of Windows filenames that resemble drives, such as ``./a:b``,
in :mod:`pathlib`.
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