Create a beatific module with options

flake.nix

@@ -31,10 +31,13 @@
     intake,
     intake-sources,
   }: {
+    nixosModules.beatific = import ./modules/beatific.nix;
+
     nixosConfigurations = {
       backyard = nixpkgs-next.lib.nixosSystem {
         system = "x86_64-linux";
         modules = [
+          self.nixosModules.beatific
           ./machine/backyard
         ];
       };

machine/backyard/default.nix

@@ -11,7 +11,7 @@
     efi.canTouchEfiVariables = true;
   };
 
-  networking.hostName = "backyard"; # Define your hostname.
+  beatific.hostName = "backyard";
   # networking.wireless.enable = true;  # Enables wireless support via wpa_supplicant.
 
   # Enable networking

modules/beatific.nix

@@ -0,0 +1,18 @@
+{ config, lib, pkgs, ... }:
+
+let
+  inherit (lib) mkOption types;
+  cfg = config.beatific;
+in {
+  options = {
+    beatific.hostName = mkOption {
+      type = types.str;
+      description = "Hostname";
+    };
+  };
+
+  config = let
+  in {
+    networking.hostName = cfg.hostName;
+  };
+}