[mod_python] "unsubscriptable object" error when instantiating a session

Hello,

When attempting to instantiate a session object, I get the following error:

  File "/berto/lib/python2.4/site-packages/mod_python/Session.py",
line 389, in Session
    timeout=timeout, lock=lock)

  File "/berto/lib/python2.4/site-packages/mod_python/Session.py",
line 294, in __init__
    timeout=timeout, lock=lock)

  File "/berto/lib/python2.4/site-packages/mod_python/Session.py",
line 132, in __init__
    Cookie.add_cookie(self._req, self.make_cookie())

  File "/berto/lib/python2.4/site-packages/mod_python/Session.py",
line 160, in make_cookie
    c.path = dirpath[len(docroot):]

TypeError: unsubscriptable object

Turns out dirpath = None on the two systems I've tried this on:

- linux, apache 2.0.54, python 2.2, mod_python 3.1.4
- os x apache 2.0.54, python 2.4.1, mod_python 3.1.4

I'm not sure if I did the correct thing, but, here is a patch to solve
the issue.  Please let me know if what I did is totally off.  But, at
least sessions are working just fine now.  : )

Thanks!

-berto.
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