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bpo-38671: Make sure to return an absolute path in pathlib._WindowsFlavour.resolve() #17716

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bpo-38671: Make sure to return an absolute path in pathlib._WindowsFlavour.resolve() #17716

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e503cd6
Prepend cwd if resolve can't find existing prefix
uranusjr Dec 27, 2019
3f9d1b8
Use os.path.abspath() as fallback as suggested
uranusjr Jul 15, 2020
612b7f6
Use early returns to reduce indentation level
uranusjr Jul 15, 2020
7cff82e
Test non-exist resolve on all platforms
uranusjr Jul 19, 2020
8f20c10
Use nt._getfullpathname instead of os.path.abspath
uranusjr Jul 19, 2020
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38 changes: 19 additions & 19 deletions Lib/pathlib.py
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Original file line number Diff line number Diff line change
Expand Up @@ -15,7 +15,7 @@


if os.name == 'nt':
from nt import _getfinalpathname
from nt import _getfinalpathname, _getfullpathname
else:
_getfinalpathname = None

Expand Down Expand Up @@ -189,26 +189,26 @@ def compile_pattern(self, pattern):
def resolve(self, path, strict=False):
s = str(path)
if not s:
return path._accessor.getcwd()
s = path._accessor.getcwd()
if _getfinalpathname is None:
return None # Means fallback on absolute
if strict:
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Lines 189-191 make a bad assumption that the current working directory (CWD) is a final path. The CWD is an absolute path but not a final path. The assignment should be something like s = str(path) or '.'. In practice it may never be an issue since PurePath.__str__ assigns and returns self._str = self._format_parsed_parts(self._drv, self._root, self._parts) or '.'.

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The CWD is an absolute path but not a final path.

TIL.

I like the or '.' approach since it avoids special-casing things, but want @pitrou to take a look since this is inherited from the initial pathlib implementation.

return self._ext_to_normal(_getfinalpathname(s))
s = path = _getfullpathname(s)
previous_s = None
if _getfinalpathname is not None:
if strict:
return self._ext_to_normal(_getfinalpathname(s))
tail_parts = [] # End of the path after the first one not found
while True:
try:
s = self._ext_to_normal(_getfinalpathname(s))
except FileNotFoundError:
previous_s = s
s, tail = os.path.split(s)
tail_parts.append(tail)
if previous_s == s:
# Root reached, fallback to _getfullpathname()
return path
else:
tail_parts = [] # End of the path after the first one not found
while True:
try:
s = self._ext_to_normal(_getfinalpathname(s))
except FileNotFoundError:
previous_s = s
s, tail = os.path.split(s)
tail_parts.append(tail)
if previous_s == s:
return path
else:
return os.path.join(s, *reversed(tail_parts))
# Means fallback on absolute
return None
return os.path.join(s, *reversed(tail_parts))

def _split_extended_path(self, s, ext_prefix=ext_namespace_prefix):
prefix = ''
Expand Down
10 changes: 10 additions & 0 deletions Lib/test/test_pathlib.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1799,6 +1799,16 @@ def test_resolve_dot(self):
# Non-strict
self.assertEqual(r.resolve(strict=False), p / '3' / '4')

def test_resolve_nonexist_relative_issue38671(self):
p = self.cls('non', 'exist')

old_cwd = os.getcwd()
os.chdir(BASE)
try:
self.assertEqual(p.resolve(), self.cls(BASE, p))
finally:
os.chdir(old_cwd)

def test_with(self):
p = self.cls(BASE)
it = p.iterdir()
Expand Down
2 changes: 2 additions & 0 deletions Misc/NEWS.d/next/Library/2019-12-28-02-50-12.bpo-38671.xT4R0P.rst
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Original file line number Diff line number Diff line change
@@ -0,0 +1,2 @@
Ensure pathlib.Path.resolve(strict=False) returns an absolute path on
Windows when the path is relative and does not exist.