Using from tox

[asmodehn]

When using pyros-setup from some code running in tox (with site-packages), the following error happens :

     pyros_setup.configurable_import().configure().activate()
/usr/local/lib/python2.7/dist-packages/pyros_setup/__init__.py:92: in configure
    """)
/usr/local/lib/python2.7/dist-packages/pyros_config/confighandler.py:74: in configure_file
    os.makedirs(os.path.dirname(cfg_filename))
.tox/py27-indigo/lib/python2.7/os.py:157: in makedirs
    mkdir(name, mode)
E   OSError: [Errno 13] Permission denied: '/usr/local/lib/python2.7/dist-packages/instance'

We need to investigate more deeply what is happening when a package under test in a tox venv tries to call pyros-setup, and how we should react...

Maybe it was just an issue of missing the pyros-setup dependency for tox usecase, but still we need to clarify the situation.

[asmodehn]

Especially, pyros-setup should not allow a user to access something outside a virtualenv to access site-packages, if the venv forbids it...

Currently it seems the venv keeps system python on the sys.path and is therefore accessible...