How to use the provided flake-parts module

[DockterTeagle]

Howdy,
as I already use flake-parts I was curious how to properly use the home-manager flake-parts module. The docs seem sparse on this

[terlar]

It is consumed like most other flake-parts modules, you import the flake module and then you utilize the exposed interface.

{
  inputs = {
    flake-parts.url = "flake-parts";
    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable-small";
    home-manager = {
      url = "home-manager";
      inputs.nixpkgs.follows = "nixpkgs";
    };
  };

  outputs =
    inputs:
    inputs.flake-parts.lib.mkFlake { inherit inputs; }: (
      { withSystem, ... }:
      {
        systems = [ "x86_64-linux" ];
        imports = [ inputs.home-manager.flakeModules.default ];

        flake = {
          homeModules = {
            module1 = {
              # home module config
            };
            module2 = ./module2.nix;
          };

          homeConfigurations.user = withSystem "x86_64-linux" (
            { pkgs, ... }:
            inputs.home-manager.lib.homeManagerConfiguration {
              inherit pkgs;
              modules = [
                ./home.nix
                {
                  # user home config
                }
              ];
            }
          )
        };
      }
    );
}

[terlar]

No, I just showed both examples, either if you do a hm module or if you define a home manager configuration. See the second attribute within flake homeConfigurations. Within the modules is where you put the configuration.

[gamemaster2b]

can it be used without the 'withSystem "x86_64-linux"'?

[terlar]

Yes, but the function inputs.home-manager.lib.homeManagerConfiguration requires pkgs. So you need some other way to provide it then. What is your problem with that? If you want something system agnostic you can define homeModules.

You can also define the home manager activation package as a regular package. Then you could use perSystem instead.

{
  inputs = {
    flake-parts.url = "flake-parts";
    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable-small";
    home-manager = {
      url = "home-manager";
      inputs.nixpkgs.follows = "nixpkgs";
    };
  };

  outputs =
    inputs:
    inputs.flake-parts.lib.mkFlake { inherit inputs; } {
      systems = [ "x86_64-linux" ];
      imports = [ inputs.home-manager.flakeModules.default ];

      perSystem =
        { pkgs, ... }:
        {
          packages.user-home =
            (inputs.home-manager.lib.homeManagerConfiguration {
              inherit pkgs;
              modules = [
                ./home.nix
                {
                  # user home config
                }
              ];
            }).activationPackage;
        };
    };
}

[gamemaster2b]

That did not work but gave me the idea to do this instead. Thank you.

perSystem =
    { pkgs, ... }:
    {
      legacyPackages = {
        homeConfigurations = {
          user-home = inputs.home-manager.lib.homeManagerConfiguration {
            inherit pkgs;
            modules = [
              ./home.nix
            ];
          };
        };
      };
    };

[terlar]

Ah, yeah, I missed the packages attribute. What you did works as well :)

Then you should be able to do nix run .#user-home