First commit

rsync_tmbackup.sh

@@ -0,0 +1,115 @@
+#!/bin/bash
+
+# -----------------------------------------------------------------------------
+# Make sure everything really stops when CTRL+C is pressed
+# -----------------------------------------------------------------------------
+
+terminate_script() {
+	echo "SIGINT caught"
+	exit 1
+}
+
+trap 'terminate_script' SIGINT
+
+# -----------------------------------------------------------------------------
+# Source and destination information
+# -----------------------------------------------------------------------------
+
+SRC_FOLDER=${1%/}
+DEST_FOLDER=${2%/}
+EXCLUSION_FILE=$3
+
+# -----------------------------------------------------------------------------
+# Check that the destination drive is a backup drive
+# -----------------------------------------------------------------------------
+
+DEST_MARKER_FILE=$DEST_FOLDER/backup.marker
+if [ ! -f "$DEST_MARKER_FILE" ]; then
+	echo "Safety check failed - the destination doesn't appear to be a backup folder or drive."
+	echo "If it is a backup folder, manually add an empty file name \"$DEST_MARKER_FILE\""
+	exit 1
+fi
+
+# -----------------------------------------------------------------------------
+# Setup additional variables
+# -----------------------------------------------------------------------------
+
+NOW=$(date +"%Y-%m-%d-%H%M%S")
+DEST=$DEST_FOLDER/$NOW
+LAST_TIME=$(ls -1 $DEST_FOLDER | grep "\d\d\d\d-\d\d-\d\d-\d\d\d\d\d\d" | tail -n 1)
+PREVIOUS_DEST=$DEST_FOLDER/$LAST_TIME
+INPROGRESS_FILE=$DEST_FOLDER/backup.inprogress
+
+# -----------------------------------------------------------------------------
+# Handle case where a previous backup failed or was interrupted.
+# -----------------------------------------------------------------------------
+
+if [ -f "$INPROGRESS_FILE" ]; then
+	if [ "$LAST_TIME" != "" ]; then
+		# - Last backup is moved to current backup folder so that it can be resumed.
+		# - 2nd to last backup becomes last backup.
+		echo "$INPROGRESS_FILE already exists - the previous backup failed or was interrupted. Backup will resume from there."
+		LINE_COUNT=$(ls -1 $DEST_FOLDER | grep "\d\d\d\d-\d\d-\d\d-\d\d\d\d\d\d" | tail -n 2 | wc -l)
+		mv $PREVIOUS_DEST $DEST
+		if [ "$LINE_COUNT" -gt 1 ]; then
+			SECOND_LAST_TIME=$(ls -1 $DEST_FOLDER | grep "\d\d\d\d-\d\d-\d\d-\d\d\d\d\d\d" | tail -n 2 | head -n 1)
+			LAST_TIME=$SECOND_LAST_TIME
+		else
+			LAST_TIME=""
+		fi
+		PREVIOUS_DEST=$DEST_FOLDER/$LAST_TIME
+	fi
+fi
+
+# -----------------------------------------------------------------------------
+# Check if we are doing an incremental backup (if previous backup exists) or not
+# -----------------------------------------------------------------------------
+
+LINK_DEST_OPTION=""
+if [ "$LAST_TIME" == "" ]; then
+	echo "No previous backup - creating new one."
+else
+	echo "Previous backup found - doing incremental backup from $PREVIOUS_DEST"
+	LINK_DEST_OPTION="--link-dest=$PREVIOUS_DEST"
+fi
+
+# -----------------------------------------------------------------------------
+# Create destination folder if it doesn't already exists
+# -----------------------------------------------------------------------------
+
+if [ ! -d "$DEST" ]; then
+	echo "Creating destination $DEST"
+	mkdir -p $DEST
+fi
+
+# -----------------------------------------------------------------------------
+# Start backup
+# -----------------------------------------------------------------------------
+
+echo "Starting backup..."
+echo "From: $SRC_FOLDER"
+echo "To:   $DEST"
+
+CMD="rsync"
+CMD="$CMD --compress"
+CMD="$CMD --numeric-ids"
+CMD="$CMD --links"
+CMD="$CMD --hard-links"
+CMD="$CMD --delete"
+CMD="$CMD --delete-excluded"
+CMD="$CMD --archive"
+CMD="$CMD --progress"
+if [ "$EXCLUSION_FILE" != "" ]; then
+	CMD="$CMD --exclude-from \"$EXCLUSION_FILE\""
+fi
+CMD="$CMD $LINK_DEST_OPTION $SRC_FOLDER/ $DEST/"
+CMD="$CMD | grep -E '^deleting|[^/]$'"
+
+touch $INPROGRESS_FILE
+eval $CMD
+EXIT_CODE=$?
+if [ "EXIT_CODE" == "0" ]; then
+	rm $INPROGRESS_FILE
+else
+	echo "Error: Exited with error code $EXIT_CODE"
+fi