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

[Michael Raskin]

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On 09/03/2010 12:29 PM, Eelco Dolstra wrote:
>> 	Part one: gtkLibs220 has no __overrides. So gtk depends on default glib
>> unless you basically copy-paste everything. Proposed solution
>> (instantiation checked, gives the same unless you use overrides):
> 
> As far as I can tell this is not necessary.  When I introduced callPackage, I
> actually took care that overriding packages in sets like gtkLibs is still
> possible :-)
> 
> For instance, you can stick this in ~/.nixpkgs/config.nix:
> 
>   packageOverrides = pkgs: rec {
>     gtkLibs220 = pkgs.gtkLibs220 // {
>       glib = pkgs.gtkLibs218.glib;
>     };
>   };

How you _add a package_ that currently works better (only) with
non-default glib? What you propose is way too global - you have to
reimport nixpkgs even to install software with different glib's into
current-system, let alone add a package into NixPkgs.

I did try my best to override things in all-packages.nix without global
changes - it turned out to be impossible. I have an understanding why
what you say fails from inside, but it is long and vague, of course.
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