nixos/alvr: init module

nixos/modules/programs/alvr.nix

@@ -0,0 +1,35 @@
+{ config, pkgs, lib, ... }:
+
+with lib;
+
+let
+  cfg = config.programs.alvr;
+in
+{
+  options = {
+    programs.alvr = {
+      enable = mkEnableOption (lib.mdDoc "ALVR, the VR desktop streamer");
+
+      package = mkPackageOption pkgs "alvr" { };
+
+      openFirewall = mkOption {
+        type = types.bool;
+        default = false;
+        description = lib.mdDoc ''
+          Whether to open the default ports in the firewall for the ALVR server.
+        '';
+      };
+    };
+  };
+
+  config = mkIf cfg.enable {
+    environment.systemPackages = [ cfg.package ];
+
+    networking.firewall = mkIf cfg.openFirewall {
+      allowedTCPPorts = [ 9943 9944 ];
+      allowedUDPPorts = [ 9943 9944 ];
+    };
+  };
+
+  meta.maintainers = with maintainers; [ passivelemon ];
+}