USERPROFILE is not passed by default on Windows

[Andre Caron]

I just got bit by this strange issue. One of my Tox virtual environment creates a nested virtual environment which does not respect settings in ~/pip/pip.ini. This is problematic because the nested environment needs to install packages from our corporate DevPI installation.

I can "fix" this by adding USERPROFILE in passenv, but I find it strange that the default behavior breaks pip and it's really hard to diagnose this unless you can make educated guesses about pip internals.

[Andre Caron]

Let me know if it makes sense to you to fix this. If so, then I can send in a patch.

[Ronny Pfannschmidt]

This issue has been moved to GitHub: https://github.com/tox-dev/tox/issues/322