seems right

modules/nixos/desktop/niri.nix

@@ -7,7 +7,7 @@
 with lib; let
   cfg = config.desktop.niri;
 in {
-  imports = [./misc/sound.nix ./misc/regreet.nix];
+  imports = [./common/pipewire.nix];
   options = {
     desktop.niri.enable =
       mkEnableOption "enable niri desktop";
@@ -52,9 +52,19 @@ in {
         "gtk"
       ];
     };
-    services.greetd.settings.initial_session = {
-      user = "user";
-      command = "${pkgs.niri}/bin/niri-session";
+    programs.regreet.enable = true;
+    services.greetd = {
+      enable = true;
+      vt = 6;
+      settings = {
+        default_session = {
+          command = "${pkgs.cage}/bin/cage -s -m last -- ${pkgs.greetd.regreet}/bin/regreet";
+        };
+        initial_session = {
+          user = "user";
+          command = "${pkgs.niri}/bin/niri-session";
+        };
+      };
     };
   };
 }