[Nix-dev] Patch for pythonPackages.numpy

[Florian Friesdorf]

Hi Marc,

On Sun, 17 Jun 2012 17:16:21 +0200, Marc Weber <marco-oweber at gmx.de> wrote:
> I'm against that patch because it heavy monkey patching does not solving the
> problem at the root of the evil. My old NIX_PYTHON_SITES patch does.
> 
> Now there is evidence that such a patch is required just to make things
> work without additional work.
> 
> What does it do? Basically it patches python import code introducing
> NIX_PYTHON_SITES which behaves as PYTHON_USER_BASE *but* allows multiple
> paths to be passed.
> (..)
> What might be the difference? My code definitely picks up .pth files.
> If you use PYTHONPATH only it may not happen. (I haven't reverified it)

pth processing is not the issue, the issue is that some packages (like
matplotlib) do not create them as part of their install.

How do you deal with that? You write below that your patch adds a pth
file to solve problems with pygtk. This sounds very similar to the
approach we take:

- PYTHONPATH is used to set sys.path

- pth files are processed as normal in exec prefixes

- where this is not sufficient, include customized site.py that
  processes pth files in all dirs of PYTHONPATH

- use propagatedBuildInputs (in contrast to buildInputs) if a package
  does not use setuptools and therefor fails to create pth files and
  therefor lacks references of other packages hashes.

> About pygtk: my patch adds a .pth file instead of creating symlinks.
> Should have the same effect.
> 
> The pygtk.require('2.0') stuff (still found on pygtk documentation)
> seems to be no longer used because nobody is using gtk-1.0 anymore.

regards
florian
-- 
Florian Friesdorf <flo at chaoflow.net>
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