Bug#642020: python-debian: ArFile (via DebFile) errors when given only a fileobj

[John Wright]

Sorry for the very delayed response.  I'm trying to clean up our
outstanding bug list...

I'm not convinced that sharing the file is the correct thing to do - it
introduces thread-unsafe-ness between DebFile/ArFile and its dependent
objects that isn't obvious up front.

In addition, the existing behavior or re-opening the file by name is bad
for another reason: it leaks open files.

I think a better solution is probably something like:
  - If the input file is a "real" file, use mmap to get a view of the
    object for members.
  - Otherwise, we should probably iterate over the entire input object
    to generate our own file-like view of it, which itself supports an
    interface similar to mmap, and use that for member objects.

-- 
John Wright <jsw at debian.org>
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