[Nix-dev] Re: [Want to commit this week] deepOverride replacement when callPackage is used

[Michael Raskin]

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On 09/02/2010 04:09 PM, Yury G. Kudryashov wrote:
>> Part two: callPackage uses default pkgs (with overrides from
>> config.nix). When you override gtkLibs,
> Where (and how) do you override gtkLibs?

In a package inside Nixpkgs. That would be used like the following:

  empathy =
  let
    pkgsFreshGlib = pkgsFun {
      gtkLibs220 = (pkgs.gtkLibs220.override {
        glib = pkgs.gtkLibs220.glib_2_25;
      });
    };
    pkgsFreshGlibCP =
    pkgs.lib.callPackageWith
    (pkgsFreshGlib // pkgsFreshGlib.xorg // pkgsFreshGlib.gtkLibs220 //
pkgsFreshGlib.gst_all //
      pkgsFreshGlib.gnome);
    empathy = pkgsFreshGlibCP
../applications/networking/instant-messengers/empathy {};
    in
    empathy;

(there is some space for making that more compact - that is more
explicit/debuggable form than absolutely needed)

>> gnome subset gets old glib
>> whatever I do (and I guess overriding gtk would be even worse).
> Offtopic: what do you want to override in gtkLibs.glib?

I want to add Empathy package - it needs glib 2.25. So I want a package
inside NixPkgs that uses everything built with a fresher glib.

It is like back when fresh libsoup needed fresh glib.
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