copy incremental backup before using

Author: Sven Speckmaier

entrypoint

@@ -352,6 +352,7 @@ restore_incremental() {
 	local BACKUP_NAME="$2"
 	local RESTORE_DIRECTORY="$3"
 	local BACKUP_PATH="${BACKUP_DIRECTORY}/${BACKUP_NAME}"
+	local TEMPORARY_BACKUP_PATH="/tmp/${BACKUP_NAME}"
 
 	echo "======================================================================"
 	echo "= Incremental full backup ${BACKUP_PATH}"
@@ -372,13 +373,16 @@ restore_incremental() {
 	echo "Copying full backup"
 	cp -Rfv "${BASE_BACKUP_PATH}" "${RESTORE_DIRECTORY}"
 
+	echo "Copying incremental Backup"
+	cp -Rfv "${BACKUP_PATH}" "${TEMPORARY_BACKUP_PATH}"
+
 	# Prepare the full backup
 	echo "Preparing ${BASE_BACKUP_NAME}"
 	xtrabackup --prepare --apply-log-only --target-dir="$RESTORE_DIRECTORY"
 
 	# apply the incremental backup
 	echo "Preparing ${BACKUP_NAME}"
-	xtrabackup --prepare --target-dir="$RESTORE_DIRECTORY" --incremental-dir="${BACKUP_PATH}"
+	xtrabackup --prepare --target-dir="$RESTORE_DIRECTORY" --incremental-dir="${TEMPORARY_BACKUP_PATH}"
 
 	echo "Done preparing"
 	# copying back the prepared directory to the data directory is done in restore() as it is a shared step