[Nix-dev] nix store: hardlink vs symlink

[Florian Friesdorf]

On Sat, 24 Sep 2011 08:03:03 -0700, shea at shealevy.com wrote:
> It seems like the problem here is with Python, not nix. Isn't there a way
> to set some env var or command line flag to set sys.prefix manually? Then
> you can create a wrapper script to call the "real" Python with the right
> value.

Setting PYTHONHOME overrides the prefix, pythonhomeWrapper (WIP) does
that.

Having:
    pyhome = pkgs.buildEnv {
      name = "pyhome";
      paths = [
        pkgs.defaultStdenv
        pkgs.python27
        pkgs.python27Packages.simplejson
        pkgs.pythonhomeWrapper
      ];
    };

you get an environment where ./bin/py is starting a python with correct
prefix.

I'm in favor of changing the python expressions to replace all relevant
scripts (./bin/python, ./bin/pythonX.Y, maybe more) with wrapped
versions.

Are there reasons against doing so?

> Or patch Python not to follow symlinks like that.

I think we should not change that, because that's what python does and
there might be people using it. Will bring this up on python-dev.

-- 
Florian Friesdorf <flo at chaoflow.net>
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