nixos-servers/nix/flake/nixos.nix

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

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