[gentoo-python] Re: distutils-r1, setuptools and egg_info mess

[Mike Gilbert]

On Fri, Aug 16, 2013 at 4:11 PM, Michał Górny <mgorny@g.o> wrote:
> The other solution is to put more hackery in the eclass. That is, find
> all .egg files in ${S} and copy them to the future 'egg-base' for each
> implementation. Then, we could keep both the separation of egg-info per
> implementation and respect the initial contents.
>
> However, I'm not really happy to play that kind of games. Probably
> the most proper place to put that logic would be 'esetup.py' function
> but that would be just awful. Then there's
> distutils-r1_python_prepare_all() which people still forget to call.
>

I actually think this might not be too bad. I don't often see
conditional sources; more common are conditional install_depends,
which end up in egg-info/requires.txt.

I think it is relatively safe to copy *.egg-info/SOURCES.txt to
BUILD_DIR. Here's a prototype:

_copy_egg_info_SOURCES() {
    local egg_info x
    while read -r -d '' x; do
        if [[ -f ${x}/SOURCES.txt ]]; then
            egg_info=${x##*/}
            mkdir -p "${BUILD_DIR}/${egg_info}" || die
            cp "${x}/SOURCES.txt" "${BUILD_DIR}/${egg_info}/" || die
        fi
    done < <(find . -type d -name '*.egg-info' -print0)
}