DVM: execute user script before save

qubes_prepare_saved_domain.sh now takes optional second argument, the
filename. The content of the file will be copied (via xenstore) to DVM
and executed just before save. This makes it possible to preload memory
with useful apps.

appvm/qubes_core

@@ -6,6 +6,18 @@
 # Source function library.
 . /etc/rc.d/init.d/functions
 
+possibly_run_save_script()
+{
+	ENCODED_SCRIPT=$(xenstore-read qubes_save_script)
+	if [ -z "$ENCODED_SCRIPT" ] ; then return ; fi
+	echo $ENCODED_SCRIPT|perl -e 'use MIME::Base64 qw(decode_base64); local($/) = undef;print decode_base64(<STDIN>)' >/tmp/qubes_save_script
+	chmod 755 /tmp/qubes_save_script
+	Xorg -config /etc/X11/xorg-preload-apps.conf :0 &
+	sleep 2
+	DISPLAY=:0 su - user -c /tmp/qubes_save_script
+	killall Xorg
+}
+
 start()
 {
 	echo -n $"Executing Qubes Core scripts:"
@@ -14,7 +26,8 @@ start()
 		echo "ERROR: /usr/bin/xenstore-read not found!"
 		exit 1
 	fi
-	if xenstore-read qubes_save_request ; then 
+	if xenstore-read qubes_save_request 2>/dev/null ; then
+		possibly_run_save_script 
 		touch /etc/this_is_dvm
 		dmesg -c >/dev/null
 #		echo 1 >/proc/sys/vm/drop_caches

rpm_spec/core-appvm.spec

@@ -81,6 +81,9 @@ cp ../common/qubes_serial_login $RPM_BUILD_ROOT/sbin
 mkdir -p $RPM_BUILD_ROOT/etc
 cp ../common/serial.conf $RPM_BUILD_ROOT/var/lib/qubes/
 
+mkdir -p $RPM_BUILD_ROOT/etc/X11
+cp xorg-preload-apps.conf $RPM_BUILD_ROOT/etc/X11
+
 mkdir -p $RPM_BUILD_ROOT/home_volatile/user
 chown 500:500 $RPM_BUILD_ROOT/home_volatile/user
 
@@ -199,3 +202,4 @@ rm -rf $RPM_BUILD_ROOT
 /usr/bin/qubes_timestamp
 %dir /home_volatile
 %attr(700,user,user) /home_volatile/user
+/etc/X11/xorg-preload-apps.conf