[ python-Bugs-1496501 ] tarfile.py: dict order dependency

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Bugs item #1496501, was opened at 2006-05-28 18:42
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Category: Python Library
Group: Python 2.5
Status: Open
Resolution: None
Priority: 5
Submitted By: Armin Rigo (arigo)
Assigned to: Nobody/Anonymous (nobody)
Summary: tarfile.py: dict order dependency

Initial Comment:
When guessing the type of a file, tarfile.py tries to
open it in .tar, .tar.gz and .tar.bz2 modes
successfully.  The problem is that in conjunction with a
fileobj argument, failed attempts can advance the
current position of the fileobj, and cause the following
attempts to fail as well.

This didn't show up so far because, by chance, the order
in which the OPEN_METH dictionary is enumerated is
somehow the "correct" one.  The problem can be seen by
changing this order and re-running test_tarfile.py; for
example, reverse the order (tarfile.py line 1013):

    for comptype in reversed(cls.OPEN_METH):


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