drop database before a restore

Dockerfile

@@ -4,6 +4,7 @@ LABEL \
 	vendor="RaspiBO"
 
 EXPOSE 5242
+VOLUME ["/eventman/data"]
 
 RUN \
 	apt-get update && \

docker-tools/run.sh

@@ -8,19 +8,20 @@ cmd="$1"
 
 if [ "${cmd}" = "--dump" ] ; then
 	echo "INFO: dumping..."
-	mongodump --host mongo --out /tmp/ --db eventman
+	mongodump --host mongo --out /tmp/ --db eventman || (echo "ERROR: unable to dump the database" ; exit 10)
 	cd /tmp
 	tar cfz /data/eventman-dump-`date +'%Y-%m-%dT%H:%M:%S'`.tgz eventman
 elif [ "${cmd}" = "--restore" ] ; then
 	if [ -z "$2" ] ; then
 		echo "ERROR: missing argument to --restore"
-		exit 2
+		exit 20
 	fi
 	echo "INFO: restoring $2..."
-	tar xfz "/data/$2" -C /tmp
+	tar xfz "/data/$2" -C /tmp || (echo "ERROR: error unpacking file" ; exit 21)
+	mongo --host mongo eventman --eval "db.dropDatabase()" || (echo "ERROR: error dropping the database" ; exit 22)
 	mongorestore --host mongo -d eventman /tmp/eventman
 else
 	echo "ERROR: command not recognized: use --dump or --restore dumps/file.tgz"
-	exit 3
+	exit 30
 fi