Quick VM restore support

appvm/fstab

@@ -8,7 +8,7 @@
 #
 /dev/mapper/dmroot /                       ext4 defaults,noatime        1 1
 /dev/mapper/dmswap swap                    swap    defaults        0 0
-/dev/xvdb		/rw			ext4	defaults	0 0
+/dev/xvdb		/rw			ext4	noauto,defaults	0 0
 tmpfs                   /dev/shm                tmpfs   defaults        0 0
 devpts                  /dev/pts                devpts  gid=5,mode=620  0 0
 sysfs                   /sys                    sysfs   defaults        0 0

appvm/qubes_core

@@ -14,6 +14,20 @@ start()
 		echo "ERROR: /usr/bin/xenstore-read not found!"
 		exit 1
 	fi
+	if xenstore-read qubes_save_request ; then 
+		dmesg -c >/dev/null
+#		echo 1 >/proc/sys/vm/drop_caches
+#		free | grep buffers/cache | 
+#			(read a b c d ; xenstore-write device/qubes_used_mem $c)
+		free | grep Mem: | 
+			(read a b c d ; xenstore-write device/qubes_used_mem $c)
+		echo "Waiting for restore"
+		while ! dmesg -c | grep "using vcpu" ; do usleep 10 ; done
+		while ! xenstore-read qubes_vm_type 2>/dev/null ; do 
+			usleep 10
+		done
+		echo Back to life.
+	fi
 
 	name=$(/usr/bin/xenstore-read name)
 	hostname $name
@@ -29,30 +43,36 @@ start()
 		echo "nameserver $secondary_dns" >> /etc/resolv.conf
 	fi
 
-	if ! [ -d /rw/home ] ; then
-	    echo
-	    echo "--> Virgin boot of the VM: Linking /home to /rw/home"
-	    mv /home /home.orig
-	    mkdir -p /rw/config
-	    mkdir -p /rw/home
-	    ln -s /rw/home/ /home
-	    cp -a /home.orig/user /home
-	    touch /rw/config/rc.local
-	    rm -fr /home.orig
-	    touch /var/lib/qubes/first_boot_completed
-	fi
+	if [ -e /dev/xvdb ] ; then
+		mount /rw
 
-	if ! [ -L /home ] ; then
-		mv /home /home.orig
-		ln -s /rw/home /home
-	fi
-	if ! [ -L /usr/local ] ; then
-        	mv /usr/local /usr/local.orig
-        	ln -s /rw/usrlocal /usr/local
-	fi
+        if ! [ -d /rw/home ] ; then
+            echo
+            echo "--> Virgin boot of the VM: Linking /home to /rw/home"
+            mv /home /home.orig
+            mkdir -p /rw/config
+            mkdir -p /rw/home
+            ln -s /rw/home/ /home
+            cp -a /home.orig/user /home
+            touch /rw/config/rc.local
+            rm -fr /home.orig
+            touch /var/lib/qubes/first_boot_completed
+        fi
+
+        if ! [ -L /home ] ; then
+            mv /home /home.orig
+            ln -s /rw/home /home
+        fi
+        if ! [ -L /usr/local ] ; then
+            mv /usr/local /usr/local.orig
+            ln -s /rw/usrlocal /usr/local
+        fi
 #make it last, we want all above to work without /rw mounted
-	if ! [ -d /rw/usrlocal ] ; then
-        	cp -a /usr/local.orig /rw/usrlocal
+		if ! [ -d /rw/usrlocal ] ; then
+        		cp -a /usr/local.orig /rw/usrlocal
+		fi
+	else
+		ln -sf /home_volatile /home
 	fi
 
 	[ -x /rw/config/rc.local ] && /rw/config/rc.local

appvm/qubes_timestamp

@@ -0,0 +1,2 @@
+#!/bin/sh
+exec xenstore-write device/qubes_timestamp $(date +%s.%N)

rpm_spec/core-appvm.spec

@@ -60,7 +60,7 @@ mkdir -p $RPM_BUILD_ROOT/etc/init.d
 cp qubes_core $RPM_BUILD_ROOT/etc/init.d/
 mkdir -p $RPM_BUILD_ROOT/var/lib/qubes
 mkdir -p $RPM_BUILD_ROOT/usr/bin
-cp qubes_add_pendrive_script qubes_penctl qvm-copy-to-vm  qvm-copy-to-vm.kde $RPM_BUILD_ROOT/usr/bin
+cp qubes_timestamp qubes_add_pendrive_script qubes_penctl qvm-copy-to-vm  qvm-copy-to-vm.kde $RPM_BUILD_ROOT/usr/bin
 mkdir -p $RPM_BUILD_ROOT/%{kde_service_dir}
 cp qvm-copy.desktop $RPM_BUILD_ROOT/%{kde_service_dir}
 mkdir -p $RPM_BUILD_ROOT/etc/udev/rules.d
@@ -77,6 +77,9 @@ 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/home_volatile/user
+chown 500:500 $RPM_BUILD_ROOT/home_volatile/user
+
 %triggerin -- initscripts
 cp /var/lib/qubes/serial.conf /etc/init/serial.conf
 
@@ -186,3 +189,6 @@ rm -rf $RPM_BUILD_ROOT
 %dir /mnt/removable
 /etc/yum.repos.d/qubes.repo
 /sbin/qubes_serial_login
+/usr/bin/qubes_timestamp
+%dir /home_volatile
+%attr(700,user,user) /home_volatile/user