MDEV-17149 mariabackup hangs if innodb is not started

Fix exit condition for the log copying thread.

Author: vaintroub

extra/mariabackup/xtrabackup.cc

@@ -2718,7 +2718,7 @@ static os_thread_ret_t log_copying_thread(void*)
 
 		log_mutex_enter();
 		bool completed = metadata_to_lsn
-			&& metadata_to_lsn < log_copy_scanned_lsn;
+			&& metadata_to_lsn <= log_copy_scanned_lsn;
 		log_mutex_exit();
 		if (completed) {
 			break;

mysql-test/suite/mariabackup/skip_innodb.opt

@@ -0,0 +1 @@
+--loose-skip-innodb

mysql-test/suite/mariabackup/skip_innodb.result

@@ -0,0 +1,10 @@
+CREATE TABLE t(i int);
+INSERT INTO t VALUES(1);
+# shutdown server
+# remove datadir
+# xtrabackup move back
+# restart server
+SELECT * from t;
+i
+1
+DROP TABLE t;

mysql-test/suite/mariabackup/skip_innodb.test

@@ -0,0 +1,12 @@
+let $targetdir=$MYSQLTEST_VARDIR/tmp/backup;
+CREATE TABLE t(i int);
+INSERT INTO t VALUES(1);
+--disable_result_log
+exec $XTRABACKUP --defaults-file=$MYSQLTEST_VARDIR/my.cnf --backup --target-dir=$targetdir;
+exec $XTRABACKUP --prepare --target-dir=$targetdir;
+-- source include/restart_and_restore.inc
+--enable_result_log
+SELECT * from t;
+DROP TABLE t;
+
+rmdir $targetdir;