Catherine Devlin added the comment:
I apologize, I retract my earlier comment - I believe both Yaroslav and I were
confused about the nature of the problem. I think it's not related to
permissions at all, but to adding a file to the tarfile twice.
To see this, use `tarfilero.py` as provided by Yaroslav, but comment out the
`tar.add('sample/rodir/file')` line (line 16) and run it - everything works
normally, and the `rodir/file` is present.
It appears that adding the directory to the tarfile also adds the file within
the directory, and adding the file individually creates a second reference to
the file. When expanding, `tarfile` attempts to create the file twice, and the
second attempt fails because a file by that name already exists.
I still think this is a bug - perhaps re-adding a file already present in a
tarfile should throw an error, or silently do nothing without adding a second
reference to the file, or at least the error message when trying to expand a
file into a path that is blocked by a file already present should give a more
informative error. I will look for existing tickets along those lines.
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue30438>
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