Removed old backup deletion prompt, and formatting tweaks.

- Removed old backup deletion prompt as it's not really needed.
- Made all variables uppercase for consistency.
- Used double square brackets in `if` statements.

README.md

@@ -36,6 +36,8 @@ An optional exclude file can be provided as a third parameter. It should be comp
 
 * Exclude file - support for pattern-based exclusion via the `--exclude-from` rsync parameter.
 
+* Automatically purge old backups - within 24 hours, all backups are kept. Within one month, the most recent backup for each day is kept. For all previous backups, the most recent of each month is kept.
+
 * "latest" symlink that points to the latest successful backup.
 
 * The application is just one bash script that can be easily edited.
@@ -44,6 +46,8 @@ An optional exclude file can be provided as a third parameter. It should be comp
 
 * Minor changes (see TODO comments in the source).
 
+* Backup to remote drive?
+
 # LICENSE
 
 [MIT](http://opensource.org/licenses/MIT)

rsync_tmbackup.sh

@@ -63,8 +63,8 @@ SRC_FOLDER=${1%/}
 DEST_FOLDER=${2%/}
 EXCLUSION_FILE=$3
 
-for arg in "$SRC_FOLDER" "$DEST_FOLDER" "$EXCLUSION_FILE"; do
+for ARG in "$SRC_FOLDER" "$DEST_FOLDER" "$EXCLUSION_FILE"; do
-	if [[ "$arg" == *"'"* ]]; then
+if [[ "$ARG" == *"'"* ]]; then
 		fn_log_error 'Arguments may not have any single quote characters.'
 		exit 1
 	fi
@@ -103,7 +103,6 @@ EPOCH=$(date "+%s")
 KEEP_ALL_DATE=$(($EPOCH - 86400))       # 1 day ago
 KEEP_DAILIES_DATE=$(($EPOCH - 2678400)) # 31 days ago
 
-
 export IFS=$'\n' # Better for handling spaces in filenames.
 PROFILE_FOLDER="$HOME/.rsync_tmbackup"
 LOG_FILE="$PROFILE_FOLDER/$NOW.log"
@@ -144,7 +143,7 @@ fi
 while [ "1" ]; do
 
 	# -----------------------------------------------------------------------------
-	# Check if we are doing an incremental backup (if previous backup exists) or not
+	# Check if we are doing an incremental backup (if previous backup exists).
 	# -----------------------------------------------------------------------------
 
 	LINK_DEST_OPTION=""
@@ -171,28 +170,29 @@ while [ "1" ]; do
 	# Purge certain old backups before beginning new backup.
 	# -----------------------------------------------------------------------------
 
-	# Default value for $prev ensures that the most recent backup is never deleted.
+	# Default value for $PREV ensures that the most recent backup is never deleted.
-	prev="0000-00-00-000000"
+	PREV="0000-00-00-000000"
-	for fname in $(fn_find_backups | sort -r); do
+	for FILENAME in $(fn_find_backups | sort -r); do
-		date=$(basename "$fname")
+		BACKUP_DATE=$(basename "$FILENAME")
-		stamp=$(fn_parse_date $date)
+		TIMESTAMP=$(fn_parse_date $BACKUP_DATE)
 
 		# Skip if failed to parse date...
-		[ -n "$stamp" ] || continue
+		if [ -z "$TIMESTAMP" ]; then
-
+			fn_log_warn "Could not parse date: $FILENAME"
-		if   [ $stamp -ge $KEEP_ALL_DATE ]; then
+			continue
-			true
-
-		elif [ $stamp -ge $KEEP_DAILIES_DATE ]; then
-			# Delete all but the most recent of each day.
-			[ "${date:0:10}" == "${prev:0:10}" ] && fn_expire_backup "$fname"
-
-		else
-			# Delete all but the most recent of each month.
-			[ "${date:0:7}" == "${prev:0:7}" ] && fn_expire_backup "$fname"
 		fi
 
-		prev=$date
+		if   [ $TIMESTAMP -ge $KEEP_ALL_DATE ]; then
+			true
+		elif [ $TIMESTAMP -ge $KEEP_DAILIES_DATE ]; then
+			# Delete all but the most recent of each day.
+			[ "${BACKUP_DATE:0:10}" == "${PREV:0:10}" ] && fn_expire_backup "$FILENAME"
+		else
+			# Delete all but the most recent of each month.
+			[ "${BACKUP_DATE:0:7}" == "${PREV:0:7}" ] && fn_expire_backup "$FILENAME"
+		fi
+
+		PREV=$BACKUP_DATE
 	done
 
 	# -----------------------------------------------------------------------------
@@ -248,22 +248,16 @@ while [ "1" ]; do
 	rm -- "$LOG_FILE"
 
 	if [ "$NO_SPACE_LEFT" == "0" ]; then
-		# TODO: -y flag
-		read -p "It looks like there is no space left on the destination. Delete old backup? (Y/n) " yn
-		case $yn in
-			[Nn]* ) exit 0;;
-		esac
-
 		fn_log_warn "No space left on device - removing oldest backup and resuming."
 
 		BACKUP_FOLDER_COUNT=$(fn_find_backups | wc -l)
-		if [ "$BACKUP_FOLDER_COUNT" -lt "2" ]; then
+		if [[ "$BACKUP_FOLDER_COUNT" -lt "2" ]]; then
 			fn_log_error "No space left on device, and no old backup to delete."
 			exit 1
 		fi
 
 		OLD_BACKUP_PATH=$(fn_find_backups | head -n 1)
-		if [ "$OLD_BACKUP_PATH" == "" ]; then
+		if [[ "$OLD_BACKUP_PATH" == "" ]]; then
 			fn_log_error "No space left on device, and cannot get path to oldest backup to delete."
 			exit 1
 		fi