[New-bugs-announce] [issue26012] pathlib.Path().rglob() is fooled by symlink loops

[Guido van Rossum]

New submission from Guido van Rossum:

I created a symlink loop as follows:

mkdir tmp
cd tmp
ln -s ../tmp baz
cd ..

Then I tried to list it recursively using rglob():

>>> list(pathlib.Path('tmp').rglob('**/*')

This caused an infinite regress:
Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "/Users/guido/src/cpython36/Lib/pathlib.py", line 1065, in rglob
    for p in selector.select_from(self):
  File "/Users/guido/src/cpython36/Lib/pathlib.py", line 549, in _select_from
    for p in successor_select(starting_point, is_dir, exists, listdir):
  File "/Users/guido/src/cpython36/Lib/pathlib.py", line 548, in _select_from
    for starting_point in self._iterate_directories(parent_path, is_dir, listdir):
  File "/Users/guido/src/cpython36/Lib/pathlib.py", line 538, in _iterate_directories
    for p in self._iterate_directories(path, is_dir, listdir):
[...]
  File "/Users/guido/src/cpython36/Lib/pathlib.py", line 538, in _iterate_directories
    for p in self._iterate_directories(path, is_dir, listdir):
  File "/Users/guido/src/cpython36/Lib/pathlib.py", line 537, in _iterate_directories
    if is_dir(path):
  File "/Users/guido/src/cpython36/Lib/pathlib.py", line 1303, in is_dir
    return S_ISDIR(self.stat().st_mode)
  File "/Users/guido/src/cpython36/Lib/pathlib.py", line 1111, in stat
    return self._accessor.stat(self)
  File "/Users/guido/src/cpython36/Lib/pathlib.py", line 371, in wrapped
    return strfunc(str(pathobj), *args)
OSError: [Errno 62] Too many levels of symbolic links: 'tmp/baz/baz/baz/baz/baz/baz/baz/baz/baz/baz/baz/baz/baz/baz/baz/baz/baz/baz/baz/baz/baz/baz/baz/baz/baz/baz/baz/baz/baz/baz/baz/baz/baz'

----------
messages: 257511
nosy: gvanrossum
priority: normal
severity: normal
status: open
title: pathlib.Path().rglob() is fooled by symlink loops
versions: Python 3.4, Python 3.5, Python 3.6

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue26012>
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