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Oh man, attaching the wrong diff and getting the diff wrong.
The issue I found with Python 2.7:
when creating a simple link in tar:
$ mkdir tar_test
$ cd tar_test
$ touch one
$ ln -s one two
$ cd ..
$ tar czf tar_test.tgz tar_test
It seems obvious that there would be a relative link in the tar file:
-rwxrwxrwx jstpierre/me 2010年11月02日 10:57:15 tar_test/two -> one
Unfortunately, as far as I can tell, tarfile treats this as an absolute path, and fails when extracting:
>>> tf.extractfile("tar_test/two")
Traceback (most recent call last):
 File "<stdin>", line 1, in <module>
 File "/usr/lib/python2.6/tarfile.py", line 2122, in extractfile
 tarinfo))
 File "/usr/lib/python2.6/tarfile.py", line 2105, in extractfile
 if tarinfo.isreg():
AttributeError: 'NoneType' object has no attribute 'isreg'
I was trying to fix that.