Fix hyprland_v3

settings/hyprland.nix

@@ -14,25 +14,31 @@ let
         (builtins.readFile
           "${pkgs.closureInfo { rootPaths = [ hyprland-pkgs.hyprland ]; }}/store-paths"))));
 
-  hyprland-wrapped = (pkgs.symlinkJoin {
+  hyprland-wrapped = pkgs.symlinkJoin {
     name = hyprland-pkgs.hyprland.name;
     paths = [ hyprland-pkgs.hyprland ];
     nativeBuildInputs = [ pkgs.makeWrapper ];
+    # passthru inside symlinkJoin flows through runCommand → mkDerivation,
+    # which correctly sets drv.passthru.  The display manager requires
+    # providedSessions; HM's hyprland module requires override.
+    passthru = {
+      providedSessions = [ "hyprland" ];
+      override = _: hyprland-wrapped;
+    };
     postBuild = ''
       wrapProgram $out/bin/start-hyprland \
         --set LD_PRELOAD "${gcc15-lib}/lib/libstdc++.so.6"
       wrapProgram $out/bin/Hyprland \
         --set LD_PRELOAD "${gcc15-lib}/lib/libstdc++.so.6"
+
+      # The session .desktop symlinks to the original package and contains
+      # its absolute store path.  Rewrite Exec= to our wrapped binary so
+      # GDM actually launches the LD_PRELOAD wrapper, not the bare binary.
+      desktop=$out/share/wayland-sessions/hyprland.desktop
+      orig=$(readlink -f "$desktop")
+      rm "$desktop"
+      sed "s|^Exec=.*|Exec=$out/bin/start-hyprland|" "$orig" > "$desktop"
     '';
-  # symlinkJoin lacks passthru; restore it from the original so the display
-  # manager finds providedSessions, and stub override so HM's hyprland module
-  # (which calls package.override { enableXWayland = ... }) doesn't error.
-  }) // {
-    passthru = (hyprland-pkgs.hyprland.passthru or {}) // {
-      providedSessions = [ "hyprland" ];
-      override = _: hyprland-wrapped;
-    };
-    override = _: hyprland-wrapped;
   };
 in
 {