* Automatically start VBoxClient-all when the X session starts. This

allows seamless windows, resizing of the desktop, cut and paster,
  etc.

svn path=/nixos/trunk/; revision=33131

modules/services/x11/display-managers/default.nix

@@ -80,6 +80,8 @@ let
 
       source /etc/profile
 
+      ${cfg.displayManager.sessionCommands}
+
       # Allow the user to setup a custom session type.
       if test -x ~/.xsession; then
           exec ~/.xsession
@@ -164,6 +166,16 @@ in
         apply = toString;
       };
 
+      sessionCommands = mkOption {
+        default = "";
+        example =
+          ''
+            xmessage "Hello World!" &
+          '';
+        type = types.string;
+        description = "Shell commands executed just before the window or desktop manager is started.";
+      };
+
       session = mkOption {
         default = [];
         example = [

modules/virtualisation/virtualbox-guest.nix

@@ -60,6 +60,11 @@ in
         InputDevice "VBoxMouse"
       '';
     
+    services.xserver.displayManager.sessionCommands =
+      ''
+        PATH=${makeSearchPath "bin" [ pkgs.gnugrep pkgs.which pkgs.xorg.xorgserver ]}:$PATH \
+          ${kernel.virtualboxGuestAdditions}/bin/VBoxClient-all
+      '';
   };
 
 }