PYTHONPATH=/nix/store/...python-nose/.../site-packages python import nose fails

[cillianderoiste]

In #206 we remove the setuptools site.py which is created during the installation. Previously it would have been possible to do the following:

$ PYTHONPATH=/nix/store/dfvw3wz9sxgmknhicyl4jyzn4wjsd87p-python-nose-1.2.1/lib/python2.7/site-packages python
Python ....
>>> import nose

This is because the generated site.py would process .pth files in the site-packages directory and add the paths to the egg files to the sys.path.

At the moment it is possible to add the full path to the egg to PYTHONPATH in order for it to be found.

Perhaps we should include the setuptools site.py to the python wrapper to get back the ability to load eggs via the site-packages directory as described above. @chaoflow what do you think?

[cillianderoiste]

I should add, I haven't verified this myself but @shlevy reported it on IRC, and I'm pretty sure this is the cause.

[shlevy]

I can verify that that literal command behaves as reported, and that if I modify the PYTHONPATH to include the egg directly it works.