[ python-Bugs-1719898 ] tarfile stops expanding with long filenames

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Bugs item #1719898, was opened at 2007-05-16 11:32
Message generated for change (Settings changed) made by gustaebel
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Category: Python Library
Group: Python 2.4
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: Christian Zagrodnick (zagy)
>Assigned to: Lars Gustäbel (gustaebel)
Summary: tarfile stops expanding with long filenames

Initial Comment:
The tarfile module fixes an issue with "Some old tar programs represent a directory as a regular file with a trailing slash.":

    if tarinfo.isreg() and tarinfo.name.endswith("/"):
        tarinfo.type = DIRTYPE

*After* that the full filename is composed. The chars >100 are stored in "prefix":

    if tarinfo.type != GNUTYPE_SPARSE:
        tarinfo.name normpath(os.path.join(nts(tarinfo.prefix), tarinfo.name))


So guess what happens if you filename has a / at the 100th character. Right, its considered a directory. Since directories have no data, the next metadata block is read from your file data which fails in various ways.

Patch attached.

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