[Nix-dev] Python platforms

[Domen Kožar]

In general, Python packages inherit meta.platforms from the interpreter -
which is all/unix for CPython.

We should just remove platforms when we know the module is pure Python or
should work on any unix.

On Thu, Aug 27, 2015 at 4:28 AM, Bryce Moore <bryce.moore at gmail.com> wrote:

> Hi Nix-dev,
>
> (Apologies if this has been discussed - I'm a brand new nix user.)
>
> I believe that many python packages in
> pkgs/top-level/python-packages.nix have "linux" as the platform, where
> "unix" or "all" may be more appropriate.
>
> I noticed this with the "gevent" python package, as I was prevented
> from building cabal2nix on my mac due to the platform declaration.
> "construct" and "bitstring" are other python packages I happened to
> notice are probably good on at least "unix".
>
> I would love to submit a pull request to fix this for various python
> packages that I can identify as "should work on unix" (or all), but I
> can't conveniently test bsd (or cygwin).
>
> How do I best move forward on this issue?
>
> Here are the counts of the different platform strings for
> python-packages.nix:
>
>   60 platforms.all
>   48 platforms.linux
>   14 platforms.unix
>    2 with platforms; linux
>    2 platforms.mesaPlatforms
>    1 with platforms; linux ++ darwin
>    1 with platforms; all
>    1 pkgs.syncthing.meta.platforms
>
> The unix vs linux numbers are particularly striking.
>
> I ran the following to generate the above:
>
> ~/Downloads/apps/nix/nixpkgs$
> grep "platforms\s=" pkgs/top-level/python-packages.nix | sed -E 's/
> *platforms *= *(.*);.*/\1/g' | sort | uniq -c | sort -r
>
> Thanks in advance,
>
> --
> bryce
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