Fix OpenNebula save/restore

opennebula/remotes/vmm/kvm/save.vitastor

@@ -14,13 +14,16 @@ FILE=$2
 VM_ID=$4
 DS_ID=$5
 
+rm -f "$FILE"
+"$DRIVER_PATH"/save $@
+
 XPATH="${DRIVER_PATH}/../../datastore/xpath.rb --stdin"
 
 unset i j XPATH_ELEMENTS
 
 while IFS= read -r -d '' element; do
     XPATH_ELEMENTS[i++]="$element"
-done < <($XPATH \
+done < <(cat | $XPATH \
     /VMM_DRIVER_ACTION_DATA/DATASTORE/TEMPLATE/VITASTOR_CONF \
     /VMM_DRIVER_ACTION_DATA/DATASTORE/TEMPLATE/IMAGE_PREFIX \
     /VMM_DRIVER_ACTION_DATA/DATASTORE/TEMPLATE/POOL_NAME)
@@ -39,7 +42,7 @@ fi
 
 DST_IMAGE="${IMAGE_PREFIX}-sys-${VM_ID}-checkpoint"
 
-exec_and_log "$CLI dd if=$FILE oimg=$DST_IMAGE" "Error importing checkpoint into $DST_IMAGE"
+exec_and_log "$CLI dd if=$FILE oimg=$DST_IMAGE conv=trunc" "Error importing checkpoint into $DST_IMAGE"
 exec_and_log "$RM -f $FILE" "Error removing checkpoint ($FILE)"
 
 exit 0