Fix config, add test for mysql with ranges

docker/mysql_tests/scripts/base_tests/full_xtrabackup_test_with_ranges.sh

@@ -0,0 +1,36 @@
+#!/bin/sh
+set -e -x
+
+. /usr/local/export_common.sh
+
+export WALE_S3_PREFIX=s3://mysqlfullxtrabackupbucket
+
+
+mysqld --initialize --init-file=/etc/mysql/init.sql
+
+service mysql start
+
+sysbench --table-size=10 prepare
+
+sysbench --time=5 run
+
+mysql -e 'FLUSH LOGS'
+
+mysqldump sbtest > /tmp/dump_before_backup
+
+wal-g backup-push
+
+mysql_kill_and_clean_data
+
+export S3_RANGE_BATCH_ENABLED=true
+wal-g backup-fetch LATEST
+
+chown -R mysql:mysql $MYSQLDATA
+
+service mysql start || (cat /var/log/mysql/error.log && false)
+
+mysql_set_gtid_purged
+
+mysqldump sbtest > /tmp/dump_after_restore
+
+diff /tmp/dump_before_backup /tmp/dump_after_restore

pkg/storages/s3/folder.go

@@ -199,7 +199,7 @@ func (folder *Folder) getReaderSettings() (rangeEnabled bool, retriesCount int,
 	minRetryDelay, maxRetryDelay time.Duration) {
 	rangeEnabled = RangeBatchEnabledDefault
 	if rangeBatch, ok := folder.settings[RangeBatchEnabled]; ok {
-		if rangeBatch == "true" {
+		if strings.TrimSpace(strings.ToLower(rangeBatch)) == "true" {
 			rangeEnabled = true
 		} else {
 			rangeEnabled = false