virtualbox: Use Linux's kbuild to build modules.

Don't rely on VirtualBox's in-tree build scripts to set include paths correctly
and use the official way of the Linux kernel to build the modules. That way we
don't need to make ugly symlinks in the kernel tree or heavily patch VirtualBox.

pkgs/applications/virtualization/virtualbox/default.nix

@@ -45,7 +45,7 @@ stdenv.mkDerivation {
     ./configure --with-qt4-dir=${qt4} \
       ${optionalString (!javaBindings) "--disable-java"} \
       ${optionalString (!pythonBindings) "--disable-python"} \
-      --disable-pulse --disable-hardening \
+      --disable-pulse --disable-hardening --disable-kmods \
       --with-mkisofs=${xorriso}/bin/xorrisofs
     sed -e 's@PKG_CONFIG_PATH=.*@PKG_CONFIG_PATH=${libIDL}/lib/pkgconfig:${glib}/lib/pkgconfig ${libIDL}/bin/libIDL-config-2@' \
         -i AutoConfig.kmk
@@ -63,51 +63,43 @@ stdenv.mkDerivation {
 
   enableParallelBuilding = true;
 
-  preBuild = ''
+  buildPhase = ''
     source env.sh
     kmk
-    cd out/linux.*/release/bin/src
-    export KERN_DIR=${kernel}/lib/modules/*/build
   '';
 
-  postBuild = ''
-    cd ../../../../..
-  '';
-    
   installPhase = ''
     libexec=$out/libexec/virtualbox
-  
+
     # Install VirtualBox files
     cd out/linux.*/release/bin
     mkdir -p $libexec
     cp -av * $libexec
-    
-    # Install kernel module
-    cd src
-    kernelVersion=$(cd ${kernel}/lib/modules; ls)
-    export MODULE_DIR=$out/lib/modules/$kernelVersion/misc
-    
-    # Remove root ownership stuff, since this does not work in a chroot environment
-    for i in `find . -name Makefile`; do
-	sed -i -e "s|-o root||g" \
-               -e "s|-g root||g" $i
-    done
-    
+
     # Install kernel modules
-    make install
-    
+    curdir="$(pwd)"
+    for makefile in $curdir/out/linux.*/release/bin/src/*/Makefile \
+                    $curdir/out/linux.*/release/bin/additions/src/*/Makefile
+    do
+      mod="$(dirname "$makefile")"
+      name="$(basename "$mod")"
+      export INSTALL_MOD_PATH="$out"
+      export INSTALL_MOD_DIR=misc
+      make -C "$MODULES_BUILD_DIR" "M=$mod" DEPMOD= modules_install
+    done
+
     # Create wrapper script
     mkdir -p $out/bin
     for file in VirtualBox VBoxManage VBoxSDL VBoxBalloonCtrl VBoxBFE VBoxHeadless; do
         ln -s "$libexec/$file" $out/bin/$file
     done
-    
+
     # Create and fix desktop item
     mkdir -p $out/share/applications
     sed -i -e "s|Icon=VBox|Icon=$libexec/VBox.png|" $libexec/virtualbox.desktop
     ln -sfv $libexec/virtualbox.desktop $out/share/applications
   '';
-  
+
   meta = {
     description = "PC emulator";
     homepage = http://www.virtualbox.org/;