Added --discard-state flag to run a snapshot-configured VM without restoring...

Added --discard-state flag to run a snapshot-configured VM without restoring the saved state (but resetting the differential disk).
This is useful for running a VM for the first time, when the init is needed, but we want the full boot.

vm-start

 #!/bin/bash
 #############################################
-# VirtualBox VM Scripts v0.11
+# VirtualBox VM Scripts v0.12
 # by ulisse aka A. Livio Beccaria
 #
 # vm-start: starts a VM
@@ -35,7 +35,7 @@ fi
 . "${SRC_DIR}/settings/${VM_ID}.settings"
 
 # read the options (command line options override settings file values)
-OPTS=`getopt -o fgir --long fullscreen,gui,no-init,no-run -n "$0" -- "$@"`
+OPTS=`getopt -o fgird --long fullscreen,gui,no-init,no-run,discard-state -n "$0" -- "$@"`
 eval set -- "$OPTS"
 
 # extract options and their arguments into variables
@@ -45,6 +45,7 @@ while true ; do
         -g|--gui) FULLSCREEN="0" ; shift ;;
         -r|--no-run) NO_RUN="1" ; shift ;;
         -i|--no-init) NO_INIT="1"; shift ;;
+	-d|--discard-state) DISCARD_STATE="1"; shift ;;
         --) shift ; break ;;
     esac
 done
@@ -117,6 +118,12 @@ vm_start_init () {
     fi
 }
 
+vm_discard_state() {
+    echo -n "Discard state... "
+    vboxmanage discardstate "${VM_NAME}"
+    echo "OK."
+}
+
 vm_start_run() {
     # --fullscreen?
     if [ "${FULLSCREEN}" == "1" ]; then
@@ -137,6 +144,7 @@ if [ $DEBUG -eq 1 ]; then
     echo "fullscreen = $FULLSCREEN"
     echo "no-init = $NO_INIT"
     echo "no-run = $NO_RUN"
+    echo "discard-state = $DISCARD_STATE"
 fi
 
 # check if vm exists
@@ -159,6 +167,11 @@ if [ "${NO_INIT}" != "1" ]; then
     vm_start_init
 fi
 
+# --discard-state?
+if [ "${DISCARD_STATE}" == "1" ]; then
+    vm_discard_state
+fi
+
 # --no-run?
 if [ "${NO_RUN}" != "1" ]; then
     vm_start_run