[Nix-dev] Re: Python 3

[Peter Simons]

Hi Marc,

did you read my last posting? I would love to know what you think about
the dependency handling approach I described in January [1]; here is the
relevant snippet for your convenience:

 >> libA requires libB. If you install libA into ~/.nix-profile/ it will
 >> be broken.
 >
 > I can think of the following possible solutions to this problem:
 >
 >  (a) we don't care. The installation process might detect the missing
 >      dependency and it might warn the user, but ultimately it's the
 >      users decision how to remedy the situation.
 >
 >  (b) Patch libA to extend "sys.path" as required before trying to import
 >      libB. It's not pretty -- particularly if libA consists of a large
 >      number of individual files --, but it does solve the problem and
 >      requires no user action whatsoever.
 >
 >  (c) Have libA create a file $out/etc/profile.d/libA.sh that sets
 >      PYTHONPATH to include libB. This solution is rather non-intrusive
 >      and lightweight, but it does require the user to source those
 >      profiles to ensure that her environment is set up correctly.

What do you think about those approaches?

Take care,
Peter


[1]  http://article.gmane.org/gmane.linux.distributions.nixos/1447