nixos-config/lib/instance.nix

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

with lib;
{
  options.instance = with types; {
    hostname = mkOption {
      type = str;
      description = "Hostname of this specific host (without domain).";
    };

    build-timestamp = mkOption {
      type = int;
      description = "Timestamp associated with the build. Used for e.g. DNS serials.";
    };
  };
}