CODEWITHSUNDEEP
nixnixpkgs
Cigarette Smoking Man
Cigarette Smoking Man

Reputation: 645

How to override packages in a nix derivation?

While developing a nix package, my default.nix looks like this:

let
  pkgs = import <nixpkgs> {
    config = { ... }
  }
in pkgs.path.to.derivation

But when turning that into an actual package, the pkgs comes in as an argument. But adding a config to that doesn't seem to work:

{ pkgs, ... }:
let
  pkgs_ = pkgs // { config = { ... } };
in pkgs_.path.to.derivation

How do I add the same config to an already existing package set?

Upvotes: 2

Views: 313

Answers (1)

Adam Chance
Adam Chance

Reputation: 297

I couldn't get this to work by attempting to merge the attributes, so instead I created a second pkgs block with the config that I wanted.

Example:

pkgs = import nixpkgs {
  inherit system;

  crossSystem = {
    config = "x86_64-unknown-linux-musl"
  }
};

jsPkgs = import nixpkgs {
  inherit system;
};

Then I could reference jsPkgs.mkDerivation when I wanted to build a derivation for the current system and pkgs.mkDerivation for cross-compiling to x86_64-unknown-linux-musl.

I would imagine this would work similarly for config blocks.

Upvotes: 0

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