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lib/types/network-definition.nix

@@ -31,35 +31,7 @@ let
     };
   };
 
-  networkHostOpts = { hostname, ... }: {
-    options = with types; {
-      hostname = mkOption {
-        type = str;
-        description =
-          "Hostname (which may map to a host in config.fudo.hosts).";
-        default = hostname;
-      };
-
-      ipv4-address = mkOption {
-        type = nullOr str;
-        description = "The V4 IP of a given host, if any.";
-        default = null;
-      };
-
-      ipv6-address = mkOption {
-        type = nullOr str;
-        description = "The V6 IP of a given host, if any.";
-        default = null;
-      };
-
-      mac-address = mkOption {
-        type = nullOr types.str;
-        description =
-          "The MAC address of a given host, if desired for IP reservation.";
-        default = null;
-      };
-    };
-  };
+  networkHostOpts = import ./network-host.nix { inherit lib; };
 
 in {
   options = with types; {

lib/types/network-host.nix

@@ -0,0 +1,32 @@
+{ lib, ... }:
+
+{ hostname, ... }:
+with lib;
+{
+  options = with types; {
+    ipv4-address = mkOption {
+      type = nullOr str;
+      description = "The V4 IP of a given host, if any.";
+      default = null;
+    };
+
+    ipv6-address = mkOption {
+      type = nullOr str;
+      description = "The V6 IP of a given host, if any.";
+      default = null;
+    };
+
+    mac-address = mkOption {
+      type = nullOr types.str;
+      description =
+        "The MAC address of a given host, if desired for IP reservation.";
+      default = null;
+    };
+
+    description = mkOption {
+      type = nullOr str;
+      description = "Description of the host.";
+      default = null;
+    };
+  };
+}