MDEV-21951: mariabackup SST fail if data-directory have lost+found directory

To fix this, it is necessary to add an option to exclude the
database with the name "lost+found" from processing (the database
name will be checked by the check_if_skip_database_by_path() or
by the check_if_skip_database() function, and as a result
"lost+found" will be skipped).

In addition, it is necessary to slightly modify the verification
logic in the check_if_skip_database() function.

Also added a new test galera_sst_mariabackup_lost_found.test

1 files changed, 37 insertions, 0 deletions

diff --git a/mysql-test/suite/galera/r/galera_sst_mariabackup_lost_found.result b/mysql-test/suite/galera/r/galera_sst_mariabackup_lost_found.result
new file mode 100644
index 00000000000..b2a2005748f
--- /dev/null
+++ b/mysql-test/suite/galera/r/galera_sst_mariabackup_lost_found.result
@@ -0,0 +1,37 @@
+connection node_1;
+connection node_2;
+connection node_2;
+Shutting down server ...
+connection node_1;
+CREATE DATABASE `lost+found`;
+USE `lost+found`;
+CREATE TABLE t1(id INT);
+INSERT INTO t1 VALUES (1), (2);
+SELECT * FROM `lost+found`.t1;
+id
+1
+2
+CREATE DATABASE `#mysql50#not_lost+found`;
+USE `#mysql50#not_lost+found`;
+CREATE TABLE t1(id INT);
+INSERT INTO t1 VALUES (1), (2);
+SELECT * FROM `#mysql50#not_lost+found`.t1;
+id
+1
+2
+Cleaning var directory ...
+connection node_2;
+Starting server ...
+SELECT * FROM `lost+found`.t1;
+id
+1
+2
+SELECT * FROM `#mysql50#not_lost+found`.t1;
+id
+1
+2
+connection node_1;
+DROP DATABASE `lost+found`;
+DROP DATABASE `#mysql50#not_lost+found`;
+disconnect node_2;
+disconnect node_1;