os/shared/core/nix.nix

{ pkgs, lib, config, nixpkgs, pwnix, ... }:

let cfg = config.custom.nix;

in with lib; {

  options.custom.nix = {
    distributedBuilds.enable = 
      (mkEnableOption "distributed builds on strawberry") // { default = true; };
  };

  # TODO: Add strawberry as a build machine here
  config = mkMerge [
    {
      nixpkgs.config.allowUnfree = true;
    	nix = {
        extraOptions = ''
          experimental-features = nix-command flakes
        '';
        registry.nixpkgs.flake = nixpkgs;
        registry.pwnix.flake = pwnix;
        settings.trusted-users = [
          "@wheel"
          "root"
        ];
    	};
    }
    (mkIf cfg.distributedBuilds.enable {
      nix.distributedBuilds = true;
      nix.buildMachines = [{
        hostName = "strawberry";
        sshUser  = "nix-build";
        sshKey   = "/etc/ssh/ssh_host_ed25519_key";

        systems = [
          "x86_64-linux"
          "aarch64-linux"
        ];

        supportedFeatures = [
          "nixos-test"
          "benchmark"
          "big-parallel"
          "kvm"
        ];
      }];
    })
  ];

}