MDEV-18855 Mariabackup should fetch innodb_compression_level from running server

- Fetch innodb_compression_level from the running server.Add the value
of innodb_compression_level in backup-my.cnf file during backup phase.
So that prepare can use the innodb_compression_level variable from
backup-my.cnf

2 files changed, 45 insertions, 0 deletions

diff --git a/mysql-test/suite/mariabackup/page_compression_level.result b/mysql-test/suite/mariabackup/page_compression_level.result
new file mode 100644
index 00000000000..6273d79f56a
--- /dev/null
+++ b/mysql-test/suite/mariabackup/page_compression_level.result
@@ -0,0 +1,14 @@
+set global innodb_compression_level = 3;
+CREATE TABLE t1(c1 INT, b CHAR(20)) ENGINE=INNODB PAGE_COMPRESSED=1;
+INSERT INTO t1 VALUES(1, 'mariadb');
+# xtrabackup backup
+# xtrabackup prepare
+FOUND /innodb_compression_level=3/ in backup-my.cnf
+DELETE FROM t1;
+ALTER TABLE t1 DISCARD TABLESPACE;
+ALTER TABLE t1 IMPORT TABLESPACE;
+SELECT * FROM t1;
+c1	b
+1	mariadb
+DROP TABLE t1;
+set global innodb_compression_level = default;
diff --git a/mysql-test/suite/mariabackup/page_compression_level.test b/mysql-test/suite/mariabackup/page_compression_level.test
new file mode 100644
index 00000000000..e80c956e621
--- /dev/null
+++ b/mysql-test/suite/mariabackup/page_compression_level.test
@@ -0,0 +1,31 @@
+#--source include/innodb_page_size.inc
+
+set global innodb_compression_level = 3;
+CREATE TABLE t1(c1 INT, b CHAR(20)) ENGINE=INNODB PAGE_COMPRESSED=1;
+INSERT INTO t1 VALUES(1, 'mariadb');
+
+echo # xtrabackup backup;
+let $targetdir=$MYSQLTEST_VARDIR/tmp/backup;
+
+--disable_result_log
+exec $XTRABACKUP --defaults-file=$MYSQLTEST_VARDIR/my.cnf  --backup --target-dir=$targetdir;
+echo # xtrabackup prepare;
+exec $XTRABACKUP --defaults-file=$MYSQLTEST_VARDIR/my.cnf --defaults-group-suffix=.1 --prepare --export --target-dir=$targetdir;
+--enable_result_log
+
+--let SEARCH_PATTERN=innodb_compression_level=3
+--let SEARCH_FILE=$targetdir/backup-my.cnf
+--source include/search_pattern_in_file.inc
+
+DELETE FROM t1;
+ALTER TABLE t1 DISCARD TABLESPACE;
+let $MYSQLD_DATADIR= `select @@datadir`;
+copy_file $targetdir/test/t1.ibd $MYSQLD_DATADIR/test/t1.ibd;
+copy_file $targetdir/test/t1.cfg $MYSQLD_DATADIR/test/t1.cfg;
+ALTER TABLE t1 IMPORT TABLESPACE;
+
+SELECT * FROM t1;
+
+DROP TABLE t1;
+set global innodb_compression_level = default;
+rmdir $targetdir;