add module for meshnamed

nixosModules/clanCore/meshnamed/default.nix

@@ -0,0 +1,46 @@
+{ config, lib, pkgs, ... }:
+{
+  options.clan.networking.meshnamed = {
+    enable = (lib.mkEnableOption "meshnamed") // {
+      default = config.clan.networking.meshnamed.networks != { };
+    };
+    networks = lib.mkOption {
+      default = { };
+      type = lib.types.attrsOf (lib.types.submodule ({ name, ... }: {
+        options = {
+          name = lib.mkOption {
+            default = name;
+            type = lib.types.str;
+            example = "my-network";
+            description = lib.mdDoc ''
+              The name of the network.
+            '';
+          };
+          subnet = lib.mkOption {
+            type = lib.types.str;
+            example = "fd43:7def:4b50:28d0:4e99:9347:3035:17ef/88";
+            description = lib.mdDoc ''
+              The subnet to use for the mesh network.
+            '';
+          };
+        };
+      }));
+    };
+  };
+  config = lib.mkIf config.clan.networking.meshnamed.enable {
+    systemd.services.meshnamed =
+      let
+        networks = lib.concatMapStringsSep "," (network: "${network.name}=${network.subnet}")
+          (builtins.attrValues config.clan.networking.meshnamed.networks);
+      in
+      {
+        wantedBy = [ "multi-user.target" ];
+        after = [ "network.target" ];
+        serviceConfig = {
+          Type = "simple";
+          ExecStart = "${pkgs.callPackage ../../../pkgs/meshname/default.nix { }}/bin/meshnamed -networks ${networks}";
+          DynamicUser = true;
+        };
+      };
+  };
+}