lock and skip target if lock present

remote-backup

@@ -131,8 +131,17 @@ doBackup() {
 	then
 		runBackup emerg.$(date +%Y%m%d%H%M)
 	else
-		rotateBackup
-		runBackup daily.0
+		if [ -f "$SNAPSHOT_RW/$NAME/.lock" ]									\
+		&& [[ $(</proc/$(<"$SNAPSHOT_RW/$NAME/.lock")/comm) = remote-backup ]]
+		then
+			failedBackups+=( "$NAME" )
+			failedReason["$NAME"]=LOCKED
+		else
+			echo $$ > "$SNAPSHOT_RW/$NAME/.lock"
+			rotateBackup
+			runBackup daily.0
+			rm "$SNAPSHOT_RW/$NAME/.lock"
+		fi
 	fi
 
 # now remount the RW snapshot mountpoint as readonly
@@ -323,6 +332,8 @@ then
 			REMOUNT_RW)
 				echo "Target device $more_info could not be mounted ReadWrite."
 			;;
+			LOCKED)
+				echo "Previous backup still running."
 			*)
 				echo "$info $moreinfo"
 			;;