initial implementation of meta

common/modules/meta.nix

@@ -1,4 +1,4 @@
-{ lib, ... }:
+{ lib, config, ... }:
 with lib;
 let
   exposesOpts = {
@@ -6,7 +6,7 @@ let
       domain = mkOption {
         type = types.str;
         example = "<name>.example.com";
-        description = ''
+        description = lib.mdDoc ''
           The domain under which this service should be available
         '';
       };
@@ -14,30 +14,76 @@ let
         type = types.int;
         default = 80;
         example = 4242;
-        description = ''
+        description = lib.mdDoc ''
           The port under which the service runs on the host
         '';
       };
     };
   };
-in
-{
+in {
   options.meta = {
-
     exposes = mkOption {
       type = with types; attrsOf (submodule exposesOpts);
+      default = { };
       description = ''
         Exposed services
       '';
     };
 
     ipv4 = mkOption {
-      type = types.str;
-      description = ''
-        Own IPv4 Address
+      type = types.nullOr types.str;
+      default = null;
+      description = lib.mdDoc ''
+        Host's IPv4 Address
       '';
     };
+
+    ipv6 = mkOption {
+      type = types.nullOr types.str;
+      default = null;
+      description = lib.mdDoc ''
+        Host's IPv6 address
+      '';
+    };
+
+    mac = mkOption {
+      type = types.nullOr types.str;
+      default = null;
+      description = lib.mdDoc ''
+        Own MAC Address
+      '';
+    };
+
+    isLaptop = mkOption {
+      type = types.bool;
+      default = false;
+      description = lib.mdDoc ''
+        Is this host a Laptop (i.e. no DNS entries should be made).
+      '';
+    };
+
+    realm = mkOption {
+      readOnly = true;
+      type = types.nullOr (types.enum [ "thalassa" "hades" "olympus" ]);
+      default = config.networking.domain;
+      defaultText = literalExpression "config.network.domain";
+    };
   };
 
-  config = { };
+  config = {
+    # TODO: Open Firewall
+
+    assertions = [
+      {
+        assertion = config.meta.mac != null;
+        message =
+          "${config.networking.fqdnOrHostName} is missing a mac address";
+      }
+      {
+        assertion = !config.meta.isLaptop -> config.meta.ipv4 != null;
+        message =
+          "${config.networking.fqdnOrHostName} needs ipv4 address set as it is not a laptop";
+      }
+    ];
+  };
 }