How to use a modified version of a module?

[voidzero]

Hi! I'd like to make a few changes to this module:

https://github.com/NixOS/nixpkgs/blob/nixos-22.11/nixos/modules/tasks/network-interfaces.nix

But I want to test them for myself before I issue a pull request. How can I do this in the 'standard' flake?

Thanks and have a blessed easter weekend,
Mark

[Misterio77]

Hey!

It's actually pretty straightforward.

• Add that module as you would any other:
  • Move it into your modules/modules/
  • List it at modules/modules/default.nix
  • Import it in your NixOS config. For example:

{ outputs, ... }: {
  imports = [ outputs.nixosModules.foo-bar ];
}

• You must now disable nixpkgs's version by adding it to a top-level (i.e. next to options, config, imports). disabledModules attribute anywhere in your config
  • I'd recommend you add that at the module itself, right here.
  • It should be a string that is the path to the original nixpkgs module file, relative from nixos/modules. In your case it would be:

{
  disabledModules = [ "tasks/network-interfaces.nix" ];
  # ...
}

Here's some docs about replacing modules. Hope this helps!

[voidzero]

Thanks for the pointers - here and on the Discord channel. 😺