[LOS-523] add automatic snapshot removal/purging

centos8_backups/backup.sh

@@ -11,6 +11,14 @@ find $SOURCE -mindepth 1 -maxdepth 1 \( -type l -o -type d \) ! -path "*$TODAY"
 $RESTIC backup --tag $TODAY --exclude-file=$EXCLUDE_LIST $SOURCE &>> $RESTIC_LOGFILE
 rm -f $EXCLUDE_LIST
 
+# Check if there are any snapshots to forget/purge
+SNAPS_TO_REMOVE=`$RESTIC forget --dry-run --group-by paths --keep-within $PRUNE_SNAPSHOTS_OLDER_THAN | grep "remove .* snapshots" | awk '{print $2}'`
+if [ ! -z $SNAPS_TO_REMOVE ]; then
+  echo "Found $SNAPS_TO_REMOVE snapshots that are older than $PRUNE_SNAPSHOTS_OLDER_THAN. Purging from restic store ..." >> $RESTIC_LOGFILE
+  $RESTIC unlock &>> $RESTIC_LOGFILE
+  $RESTIC forget --group-by paths --keep-within $PRUNE_SNAPSHOTS_OLDER_THAN --prune &>> $RESTIC_LOGFILE
+fi
+
 echo "Sending email of $RESTIC_LOG to admins"
 export TODAY="$TODAY"
 export RESTIC_LOG="`cat $RESTIC_LOGFILE`"