nixos-servers/flake-parts/nixos.nix

{ myLib, nixpkgs, nixpkgs-unstable, machines, dns, agenix, nixos-hardware, kubenix, disko, ... }:
let
  mkNixosSystems = systemDef:
    builtins.mapAttrs
      (name: machine:
        nixpkgs.lib.nixosSystem (systemDef name machine)
      )
      machines;
in
{
  nixosConfigurations = mkNixosSystems (name: machine: {
    system = machine.arch;

    specialArgs = { inherit myLib nixpkgs-unstable machines machine dns agenix nixos-hardware kubenix disko; };
    modules = [
      ../configuration.nix
      { networking.hostName = name; }
      {
        nixpkgs.overlays = [
          (final: _prev: {
            unstable = import nixpkgs-unstable {
              system = machine.arch;
            };
          })
        ];
      }
    ];
  });
}