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GH-110488: Fix two small issues in `pathlib.PurePath.with_name()` (#110651) 

Ensure that `PurePath('foo/a').with_name('.')` raises `ValueError`

Ensure that `PureWindowsPath('foo/a').with_name('a:b')` does not raise
`ValueError`.
This commit is contained in:
Barney Gale 2023-10-11 04:45:11 +01:00 committed by GitHub
parent 790ecf6302
commit b5f7777cb3
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GPG Key ID: 4AEE18F83AFDEB23
3 changed files with 15 additions and 6 deletions
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3
Lib/pathlib.py
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@ -603,8 +603,7 @@ class PurePath:
if not self.name:
raise ValueError("%r has an empty name" % (self,))
m = self.pathmod
drv, root, tail = m.splitroot(name)
if drv or root or not tail or m.sep in tail or (m.altsep and m.altsep in tail):
if not name or m.sep in name or (m.altsep and m.altsep in name) or name == '.':
raise ValueError("Invalid name %r" % (name))
return self._from_parsed_parts(self.drive, self.root,
self._tail[:-1] + [name])

14
Lib/test/test_pathlib.py
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@ -614,6 +614,7 @@ class PurePathTest(unittest.TestCase):
self.assertRaises(ValueError, P('.').with_name, 'd.xml')
self.assertRaises(ValueError, P('/').with_name, 'd.xml')
self.assertRaises(ValueError, P('a/b').with_name, '')
self.assertRaises(ValueError, P('a/b').with_name, '.')
self.assertRaises(ValueError, P('a/b').with_name, '/c')
self.assertRaises(ValueError, P('a/b').with_name, 'c/')
self.assertRaises(ValueError, P('a/b').with_name, 'c/d')
@ -631,6 +632,7 @@ class PurePathTest(unittest.TestCase):
self.assertRaises(ValueError, P('.').with_stem, 'd')
self.assertRaises(ValueError, P('/').with_stem, 'd')
self.assertRaises(ValueError, P('a/b').with_stem, '')
self.assertRaises(ValueError, P('a/b').with_stem, '.')
self.assertRaises(ValueError, P('a/b').with_stem, '/c')
self.assertRaises(ValueError, P('a/b').with_stem, 'c/')
self.assertRaises(ValueError, P('a/b').with_stem, 'c/d')
@ -1235,8 +1237,10 @@ class PureWindowsPathTest(PurePathTest):
self.assertRaises(ValueError, P('c:').with_name, 'd.xml')
self.assertRaises(ValueError, P('c:/').with_name, 'd.xml')
self.assertRaises(ValueError, P('//My/Share').with_name, 'd.xml')
self.assertRaises(ValueError, P('c:a/b').with_name, 'd:')
self.assertRaises(ValueError, P('c:a/b').with_name, 'd:e')
self.assertEqual(str(P('a').with_name('d:')), '.\\d:')
self.assertEqual(str(P('a').with_name('d:e')), '.\\d:e')
self.assertEqual(P('c:a/b').with_name('d:'), P('c:a/d:'))
self.assertEqual(P('c:a/b').with_name('d:e'), P('c:a/d:e'))
self.assertRaises(ValueError, P('c:a/b').with_name, 'd:/e')
self.assertRaises(ValueError, P('c:a/b').with_name, '//My/Share')
@ -1249,8 +1253,10 @@ class PureWindowsPathTest(PurePathTest):
self.assertRaises(ValueError, P('c:').with_stem, 'd')
self.assertRaises(ValueError, P('c:/').with_stem, 'd')
self.assertRaises(ValueError, P('//My/Share').with_stem, 'd')
self.assertRaises(ValueError, P('c:a/b').with_stem, 'd:')
self.assertRaises(ValueError, P('c:a/b').with_stem, 'd:e')
self.assertEqual(str(P('a').with_stem('d:')), '.\\d:')
self.assertEqual(str(P('a').with_stem('d:e')), '.\\d:e')
self.assertEqual(P('c:a/b').with_stem('d:'), P('c:a/d:'))
self.assertEqual(P('c:a/b').with_stem('d:e'), P('c:a/d:e'))
self.assertRaises(ValueError, P('c:a/b').with_stem, 'd:/e')
self.assertRaises(ValueError, P('c:a/b').with_stem, '//My/Share')

4
Misc/NEWS.d/next/Library/2023-10-10-22-54-56.gh-issue-110488.2I7OiZ.rst Normal file
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@ -0,0 +1,4 @@
Fix a couple of issues in :meth:`pathlib.PurePath.with_name`: a single dot
was incorrectly considered a valid name, and in :class:`PureWindowsPath`, a
name with an NTFS alternate data stream, like ``a:b``, was incorrectly
considered invalid.