[ python-Bugs-930024 ] os.path.realpath can't handle symlink loops

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Bugs item #930024, was opened at 2004-04-05 22:59
Message generated for change (Comment added) made by loewis
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Category: Python Library
Group: Python 2.4
>Status: Open
Resolution: Fixed
>Priority: 7
Submitted By: A.M. Kuchling (akuchling)
Assigned to: Nobody/Anonymous (nobody)
Summary: os.path.realpath can't handle symlink loops

Initial Comment:
Create a symlink pointing to itself:

ln -s infinite infinite

Run os.path.realpath() on it, and it recurses
infinitely (until the stack limit is hit):

>>> import os
>>> os.path.realpath('/home/amk/infinite')
Traceback (most recent call last):
  File "<stdin>", line 1, in ?
  File "/usr/lib/python2.3/posixpath.py", line 416, in
realpath
    return realpath(newpath)

os.path.realpath() should be fixed; /home/amk/infinite
is a perfectly good path, though it can't be followed.


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>Comment By: Martin v. Löwis (loewis)
Date: 2004-08-02 12:20

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The code that has been committed is incorrect if the link to
be resolved is relative.  _resolve_link uses abspath to
determine whether the link is absolute. This function
returns an absolute path (possibly using getcwd); the
function that should have been used is isabs().

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Comment By: Brett Cannon (bcannon)
Date: 2004-07-11 00:59

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Applied as rev. 1.67 in 2.4a2 and rev. 1.62.6.2 in 2.3.5 with only minor 
cleanup.

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Comment By: A.M. Kuchling (akuchling)
Date: 2004-06-05 20:58

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Patch attached; review requested.


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