rastkov
99258d80ab
Set LAST_TIME, LINE_CONUT and SECOND_LAST_TIME based on `uname -s` output for Mac OS compatibility.
141 lines
5.0 KiB
Bash
141 lines
5.0 KiB
Bash
#!/usr/bin/env bash
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# -----------------------------------------------------------------------------
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# Make sure everything really stops when CTRL+C is pressed
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# -----------------------------------------------------------------------------
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terminate_script() {
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echo "SIGINT caught"
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exit 1
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}
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trap 'terminate_script' SIGINT
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# -----------------------------------------------------------------------------
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# Source and destination information
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# -----------------------------------------------------------------------------
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SRC_FOLDER=${1%/}
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DEST_FOLDER=${2%/}
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EXCLUSION_FILE=$3
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# -----------------------------------------------------------------------------
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# Check that the destination drive is a backup drive
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# -----------------------------------------------------------------------------
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DEST_MARKER_FILE=$DEST_FOLDER/backup.marker
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if [ ! -f "$DEST_MARKER_FILE" ]; then
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echo "Safety check failed - the destination does not appear to be a backup folder or drive (marker file not found)."
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echo "If it is indeed a backup folder, you may add the marker file by running the following command:"
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echo ""
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echo "touch \"$DEST_MARKER_FILE\""
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echo ""
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exit 1
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fi
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# -----------------------------------------------------------------------------
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# Setup additional variables
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# -----------------------------------------------------------------------------
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NOW=$(date +"%Y-%m-%d-%H%M%S")
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DEST=$DEST_FOLDER/$NOW
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# Set LAST_TIME, LINE_CONUT and SECOND_LAST_TIME based on uname -s output for Mac OS compatibility
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# I guess there might be an more elegant way to do this
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case `uname -s` in
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Darwin)
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LAST_TIME=$(find -E $DEST_FOLDER -type d -iregex "./[0-9]{4}-[0-9]{2}-[0-9]{2}-[0-9]{6}" -prune | sort | tail -n 1)
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LINE_COUNT=$(find -E $DEST_FOLDER -type d -iregex "./[0-9]{4}-[0-9]{2}-[0-9]{2}-[0-9]{6}" -prune | sort | tail -n 2 | wc -l)
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SECOND_LAST_TIME=$(find -E $DEST_FOLDER -type d -iregex "./[0-9]{4}-[0-9]{2}-[0-9]{2}-[0-9]{6}" -prune | sort | tail -n 2 | head -n 1)
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;;
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*)
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LAST_TIME=$(find $DEST_FOLDER -type d -regextype posix-extended -regex "^.*[0-9]{4}-[0-9]{2}-[0-9]{2}-[0-9]{6}" -prune | sort | tail -n 1)
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LINE_COUNT=$(find $DEST_FOLDER -type d -regextype posix-extended -regex "^.*[0-9]{4}-[0-9]{2}-[0-9]{2}-[0-9]{6}" -prune | sort | tail -n 2 | wc -l)
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SECOND_LAST_TIME=$(find $DEST_FOLDER -type d -regextype posix-extended -regex "^.*[0-9]{4}-[0-9]{2}-[0-9]{2}-[0-9]{6}" -prune | sort | tail -n 2 | head -n 1)
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;;
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esac
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PREVIOUS_DEST=$LAST_TIME
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INPROGRESS_FILE=$DEST_FOLDER/backup.inprogress
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# -----------------------------------------------------------------------------
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# Handle case where a previous backup failed or was interrupted.
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# -----------------------------------------------------------------------------
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if [ -f "$INPROGRESS_FILE" ]; then
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if [ "$LAST_TIME" != "" ]; then
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# - Last backup is moved to current backup folder so that it can be resumed.
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# - 2nd to last backup becomes last backup.
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echo "$INPROGRESS_FILE already exists - the previous backup failed or was interrupted. Backup will resume from there."
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mv $PREVIOUS_DEST $DEST
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if [ "$LINE_COUNT" -gt 1 ]; then
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LAST_TIME=$SECOND_LAST_TIME
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else
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LAST_TIME=""
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fi
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PREVIOUS_DEST=$DEST_FOLDER/$LAST_TIME
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fi
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fi
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# -----------------------------------------------------------------------------
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# Check if we are doing an incremental backup (if previous backup exists) or not
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# -----------------------------------------------------------------------------
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LINK_DEST_OPTION=""
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if [ "$LAST_TIME" == "" ]; then
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echo "No previous backup - creating new one."
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else
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# If the path is relative, it needs to be relative to the destination. To keep
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# it simple, just use an absolute path. See http://serverfault.com/a/210058/118679
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PREVIOUS_DEST=`cd \`dirname "$PREVIOUS_DEST"\`; pwd`"/"`basename "$PREVIOUS_DEST"`
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echo "Previous backup found - doing incremental backup from $PREVIOUS_DEST"
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LINK_DEST_OPTION="--link-dest=$PREVIOUS_DEST"
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fi
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# -----------------------------------------------------------------------------
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# Create destination folder if it doesn't already exists
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# -----------------------------------------------------------------------------
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if [ ! -d "$DEST" ]; then
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echo "Creating destination $DEST"
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mkdir -p $DEST
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fi
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# -----------------------------------------------------------------------------
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# Start backup
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# -----------------------------------------------------------------------------
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echo "Starting backup..."
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echo "From: $SRC_FOLDER"
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echo "To: $DEST"
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CMD="rsync"
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CMD="$CMD --compress"
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CMD="$CMD --numeric-ids"
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CMD="$CMD --links"
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CMD="$CMD --hard-links"
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CMD="$CMD --delete"
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CMD="$CMD --delete-excluded"
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CMD="$CMD --one-file-system"
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CMD="$CMD --archive"
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CMD="$CMD --progress"
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if [ "$EXCLUSION_FILE" != "" ]; then
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CMD="$CMD --exclude-from \"$EXCLUSION_FILE\""
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fi
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CMD="$CMD $LINK_DEST_OPTION $SRC_FOLDER/ $DEST/"
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CMD="$CMD | grep -E '^deleting|[^/]$'"
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echo "Running command:"
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echo $CMD
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touch $INPROGRESS_FILE
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eval $CMD
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EXIT_CODE=$?
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if [ "$EXIT_CODE" == "0" ]; then
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rm $INPROGRESS_FILE
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else
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echo "Error: Exited with error code $EXIT_CODE"
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fi
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