[Distutils] Replacing pkg_resources with distlib in pip

[Vinay Sajip]

Donald Stufft <donald <at> stufft.io> writes:


> > released distlib is treated as 2.0, whereas for pip I had to change it to
> > 1.3.
> 
> This part worries me. I don't think should maintain any patches for things
inside of pip.vendor.

Well, the pip test data includes some distributions which include the
post-1.2 metadata fields and have a metadata version of "1.3". The upstream
distlib version is 2.0 (though the format is still key-value, pending
changes to PEP 426). My aim was to limit changes to pip to just
pkg_resources -> pip.vendor.distlib.pkg_resources. Without my renaming "2.0"
to "1.3", some of the pip tests fail because Metadata version 1.3 is
unrecognised.

Note that pip.vendor.distlib.pkg_resources is a custom shim module to cover
pip's use of pkg_resources - it's not a generic replacement for
pkg_resources (because I am only currently interested in supplanting use of
pkg_resources by pip, and not in a wider sphere). Thus it is not part of
upstream distlib (of course, it could be moved to somewhere else in the pip
package hierarchy).

Regards,

Vinay Sajip