[18:28:56] <dstufft> mitsuhiko: I think Builder().describe_package() will fail for any packages which use a setup_requires or which does something else that causes output to always happen
[18:29:35] <mitsuhiko> dstufft: yeah, that kinda needs a dummy invoke first
[18:30:12] <mitsuhiko> setup_requires is not my friend
[18:32:19] <dstufft> mitsuhiko: it looks like a good idea, you might want to use pip to do the downloading if you care at all about supporting indexes which aren't PyPI
[18:37:55] <mitsuhiko> dstufft: to be honest, this whole thing only works because virtualenv.py looks for its own .whl files in the same folder as it's placed
[18:38:02] <mitsuhiko> which i don't think is documented behavior :P
[18:38:43] <dstufft> I tihnk it's documented, it also has --extra-search-dir (IIRC the name) which lets you pass other direcotires to look at too