feat: refs #8869 remove previous differential backup

roles/db/files/mariabackup/make-backup.sh

@@ -10,7 +10,7 @@ myDir="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
 
 level=$1
 historyName=$2
-todayDir="$(date +%Y-%m-%d)"
+curDate="$(date +%Y-%m-%d)"
 
 usage() {
 	echo "Usage: $0 <Full|Differential|Incremental> [historyName]"
@@ -27,7 +27,7 @@ fi
 
 case "$level" in
 	Full)
-		backupName="${todayDir}_$(date +"%H-%M")_full"
+		backupName="${curDate}_$(date +"%H-%M")_full"
 		backupFile="$backupDir/$backupName.gz"
 
 		if [ -d "$backupDir" ]; then
@@ -54,7 +54,7 @@ case "$level" in
 		fi
 		;;
 	Differential|Incremental)
-		pattern="$backupDir/${todayDir}_??-??_full.gz"
+		pattern="$backupDir/${curDate}_??-??_full.gz"
 		files=($pattern)
 		backupFile="${files[0]}"
 		backupBase=$(basename -- "$backupFile")
@@ -63,6 +63,9 @@ case "$level" in
 		incrementalName="${backupName%%_full}_diff_$(date +"%H-%M")"
 		incrementalFile="$backupDir/${incrementalName}.gz"
 
+		if [ "$level" = "Differential" ]; then
+			rm -rf "$backupDir/${curDate}_"??-??_diff_??-??
+		fi
 		if [ -z "$historyName" ]; then
 			historyName=$incrementalName
 		fi