refactor(steam): scope VR configuration to Zeus

configs/nixos/modules/desktop/apps/steam.nix

@@ -6,62 +6,26 @@
   ...
 }:
 # Steam game launcher and runtime integration.
-let
-  cfg = config.modules.desktop.apps.steam;
-  steamVrLauncher = "/home/${config.user.name}/.local/share/Steam/steamapps/common/SteamVR/bin/linux64/vrcompositor-launcher";
-in
 {
-  options.modules.desktop.apps.steam = {
-    enable = lib.mkEnableOption "Steam game launcher";
+  options.modules.desktop.apps.steam.enable = lib.mkEnableOption "Steam game launcher";
 
-    vr.enable = lib.mkEnableOption "SteamVR with VRLink";
+  config = lib.mkIf config.modules.desktop.apps.steam.enable {
+    programs.gamemode.enable = true;
+
+    programs.steam = {
+      enable = true;
+      package = pkgs.steam.override {
+        extraEnv.STEAM_FORCE_DESKTOPUI_SCALING = "1.5";
+      };
+    };
+
+    hardware.steam-hardware.enable = true;
+
+    programs.gamescope.enable = true;
+
+    registry.window-icon.${config.networking.hostName}.steam = {
+      class = "[Ss]team";
+      icon = util.glyph "f1b6";
+    };
   };
-
-  config = lib.mkIf cfg.enable (
-    lib.mkMerge [
-      {
-        programs.gamemode.enable = true;
-
-        programs.steam = {
-          enable = true;
-          package = pkgs.steam.override {
-            extraEnv.STEAM_FORCE_DESKTOPUI_SCALING = "1.5";
-          };
-        };
-
-        hardware.steam-hardware.enable = true;
-
-        programs.gamescope.enable = true;
-
-        registry.window-icon.${config.networking.hostName}.steam = {
-          class = "[Ss]team";
-          icon = util.glyph "f1b6";
-        };
-      }
-      (lib.mkIf cfg.vr.enable {
-        networking.firewall.allowedUDPPorts = [ 10400 ];
-
-        programs.gamescope.capSysNice = true;
-
-        systemd.paths.steamvr-capabilities = {
-          wantedBy = [ "multi-user.target" ];
-          pathConfig = {
-            PathChanged = steamVrLauncher;
-            Unit = "steamvr-capabilities.service";
-          };
-        };
-
-        systemd.services.steamvr-capabilities = {
-          wantedBy = [ "multi-user.target" ];
-          path = [ pkgs.libcap ];
-          script = ''
-            if [ -e ${lib.escapeShellArg steamVrLauncher} ]; then
-              setcap cap_sys_nice=eip ${lib.escapeShellArg steamVrLauncher}
-            fi
-          '';
-          serviceConfig.Type = "oneshot";
-        };
-      })
-    ]
-  );
 }