ArchiveFS tests fail when run under tox

What steps will reproduce the problem?
1. Install libarchve 3.0.3  (see also 
http://code.google.com/p/python-libarchive/issues/detail?id=1 )
2. tox -e py27

What do you see instead?
======================================================================
ERROR: Failure: ImportError (No module named libarchive)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/home/builds/svn/pyfilesystem-temp/.tox/py27/local/lib/python2.7/site-packages/nose/loader.py", line 390, in loadTestsFromName
    addr.filename, addr.module)
  File "/home/builds/svn/pyfilesystem-temp/.tox/py27/local/lib/python2.7/site-packages/nose/importer.py", line 39, in importFromPath
    return self.importFromDir(dir_path, fqname)
  File "/home/builds/svn/pyfilesystem-temp/.tox/py27/local/lib/python2.7/site-packages/nose/importer.py", line 86, in importFromDir
    mod = load_module(part_fqname, fh, filename, desc)
  File "/home/builds/svn/pyfilesystem-temp/.tox/py27/local/lib/python2.7/site-packages/fs/tests/test_archivefs.py", line 16, in <module>
    from fs.contrib import archivefs
  File "/home/builds/svn/pyfilesystem-temp/.tox/py27/local/lib/python2.7/site-packages/fs/contrib/archivefs.py", line 20, in <module>
    import libarchive
ImportError: No module named libarchive

----------------------------------------------------------------------
Ran 1007 tests in 71.660s

FAILED (errors=1)
ERROR: InvocationError: 
'/home/builds/svn/pyfilesystem-temp/.tox/py27/bin/nosetests fs.tests -v'

Original issue reported on code.google.com by gc...@loowis.durge.org on 13 Aug 2012 at 12:31

piranna / pyfilesystem

ArchiveFS tests fail when run under tox #123