inArgs: hostname: hostOptions: let
  nixosSystem =
    if (hostOptions ? unstable && hostOptions.unstable)
    then inArgs.nixos-unstable.lib.nixosSystem
    else inArgs.nixpkgs.lib.nixosSystem;
in
  nixosSystem {
    specialArgs = {inherit inArgs;};
    modules = [
      ./hosts/${hostname}
      {
        networking.hostName = hostname;

        # This value determines the NixOS release from which the default
        # settings for stateful data, like file locations and database versions
        # on your system were taken. It‘s perfectly fine and recommended to leave
        # this value at the release version of the first install of this system.
        # Before changing this value read the documentation for this option
        # (e.g. man configuration.nix or on https://nixos.org/nixos/options.html).
        system.stateVersion = hostOptions.stateVersion; # Did you read the comment?
      }
    ];
  }