feat(system: services: networking): add GNS3 module

Signed-off-by: tsrk. <tsrk@tsrk.me>

Author: ItsShamed

hosts/taku/default.nix

@@ -11,6 +11,7 @@
     self.nixosModules.profile-tsrk-common
     self.nixosModules.gamescope
     self.nixosModules.hyprland
+    self.nixosModules.gns3
     (self.lib.generateFullUser "tsrk" {
       canSudo = true;
       hashedPasswordFile = config.age.secrets.zpasswd.path;
@@ -33,6 +34,8 @@
     focusriteSupport = true;
   };
 
+  tsrk.gns3.enable = true;
+
   tsrk.packages.pkgs.java.jdk.extraPackages = with pkgs; [ temurin-jre-bin-17 ];
 
   time.hardwareClockInLocalTime = true;

modules/system/imports.nix

@@ -13,6 +13,7 @@
   ./services/hardware/bluetooth.nix
   ./services/hardware/disks.nix
   ./services/networking/sshd
+  ./services/networking/gns3.nix
   ./services/system/earlyoom
   ./services/virtualisation/containers
   ./services/virtualisation/libvirt.nix

modules/system/services/networking/gns3.nix

@@ -0,0 +1,24 @@
+# Copyright (c) 2025 tsrk. <tsrk@tsrk.me>
+# This file is licensed under the MIT license
+# See the LICENSE file in the repository root for more info.
+
+# SPDX-License-Identifier: MIT
+
+{ config, lib, pkgs, ... }:
+
+let cfg = config.tsrk.gns3;
+in {
+  options = {
+    tsrk.gns3 = { enable = lib.options.mkEnableOption "tsrk's GNS3 setup"; };
+  };
+
+  config = lib.mkIf cfg.enable {
+    environment.systemPackages = with pkgs; [ gns3-gui vpcs ];
+
+    services.gns3-server = {
+      enable = true;
+      vpcs.enable = lib.mkDefault true;
+      ubridge.enable = lib.mkDefault true;
+    };
+  };
+}