[RFC] TreeTransform fooled by os.rename on case insensitive filesystems

[John Arbash Meinel]

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> 
>> You mean forcing TT to create a directory for every file ?
> 
> Well, what I really mean is changing the test so that it tries to rename
> a directory on top of another directory.  I believe this causes failures
> on every platform.
> 
> Aaron

You have to have content inside the directory. Doing:

python
>>> import os
>>> os.mkdir('foo')
>>> os.mkdir('bar')
>>> os.rename('foo', 'bar')

Will succeed on Linux.

>>> os.mkdir('foo')
>>> open('foo/baz', 'wb').close()
>>> os.mkdir('bar')
>>> open('bar/bing', 'wb').close()
>>> os.rename('foo', 'bar')

Will fail.

We ran into this when we were exploring filesystem locking.

John
=:->

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