System config flake with darwin and linux system definitions

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1

I’m trying to consolidate the system config + HM flakes for my linux machines and a aarch64-darwin.

I thought I’d just mix them up to have:

  outputs = inputs @ { self, nixpkgs, nurpkgs, nixpkgsUnstable, musnix, home-manager }:
    {
      homeConfigurations = (
        import ./outputs/home-conf.nix {
          inherit (inputs) nixpkgs nurpkgs nixpkgsUnstable home-manager;
          nixosConfigs = inputs.self.nixosConfigurations;
        }
      );

      nixosConfigurations = (
        import ./outputs/nixos-conf.nix {
          inherit (nixpkgs) lib;
          inherit inputs;
        }
      );

      darwinConfigurations."jm1b" = darwin.lib.darwinSystem {
        # nixpkgs.overlays = overlays;
        specialArgs = { inherit darwin overlays; };
        system = "aarch64-darwin";
        modules = [ ../system/machine/jm1b/darwin-configuration.nix ];
      };
    };

because they’re lazily evaluated anyway, and then call the same flake with nixos-rebuild on linux and darwin-rebuild in mac.

But when I add darwin to the inputs, and run for a linux system, I get the following error:

error: 'outputs' at /nix/.../flake.nix:27:13 called with unexpected argument 'darwin'

So I’m still stuck with a different flake for darwin; for synergy I’m just importing the user specific HM config part via outputs/home-conf.nix which then calls all the user’s packages/services/programs via imports, to get the “same” settings for my user across systems. (System-specifics are selected with conditional imports).

Is anyone running multi-platform configs from one flake; how to achieve that?

The objective is to have one flake and all systems/users imported from nix expressions in respective subdirs, to leverage sharing of common settings without duplication.

2

There is no darwin input here, what is your full config? What exactly do you change when you say

Is all you need to do adding a ... to that arg list?

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3

Ah yes, of course (it had probably gotten too late :man_facepalming: )…
Indeed it was a simple matter of missing darwin in the arguments.

So finally I came up with this (I’ll refactor a bit more I guess to use the nixos-conf wrapper to get it more parametrised):

{
  description = "Home Manager (dotfiles) and NixOS configurations";

  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/nixos-22.05";
    nixpkgsUnstable.url = "github:NixOS/nixpkgs/nixos-unstable";

    darwin.url = "github:lnl7/nix-darwin/master";
    darwin.inputs.nixpkgs.follows = "nixpkgs";

    home-manager = {
      url = github:nix-community/home-manager/release-22.05;
      inputs.nixpkgs.follows = "nixpkgs";
    };

    nurpkgs = {
      url = github:nix-community/NUR;
      # inputs.nixpkgs.follows = "nixpkgs";
    };

    musnix = { url = "github:musnix/musnix"; };

    # tex2nix = {
    #   url = github:Mic92/tex2nix/4b17bc0;
    #   inputs.utils.follows = "nixpkgs";
    # };
  };

  outputs = inputs @ { self, nixpkgs, nurpkgs, nixpkgsUnstable, musnix, home-manager, darwin }:
    {
      homeConfigurations = (
        import ./outputs/home-conf.nix {
          inherit (inputs) nixpkgs nurpkgs nixpkgsUnstable home-manager;
          nixosConfigs = inputs.self.nixosConfigurations;
        }
      );

      nixosConfigurations = (
        import ./outputs/nixos-conf.nix {
          inherit (nixpkgs) lib;
          inherit inputs;
        }
      );

      darwinConfigurations."jm1b" = let
          system = "aarch64-darwin";
          overlays = [
            (final: prev: {
              unstable = inputs.nixpkgsUnstable.legacyPackages.aarch64-darwin;
            })
          ];
        in darwin.lib.darwinSystem {
          inherit inputs system;
          specialArgs = { inherit darwin system overlays; };
          modules = [ ./system/machine/jm1b/darwin-configuration.nix ];
        };
    };
}
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