MDEV-6858: enforce_storage_engine option

Merge from Percona Server enforced use of a specific storage engine
authored by Stewart Smith.

Modified to be session variable and modifiable only by SUPER. Use
similar implementation as default_storage_engine.

2 files changed, 105 insertions, 0 deletions

diff --git a/mysql-test/r/enforce_storage_engine.result b/mysql-test/r/enforce_storage_engine.result
new file mode 100644
index 00000000000..3b29d5ecb09
--- /dev/null
+++ b/mysql-test/r/enforce_storage_engine.result
@@ -0,0 +1,102 @@
+drop table if exists t1;
+SET SESSION enforce_storage_engine=MyISAM;
+select @@session.enforce_storage_engine;
+@@session.enforce_storage_engine
+MyISAM
+CREATE TABLE t1 (c1 INT PRIMARY KEY AUTO_INCREMENT, c2 VARCHAR(10)) ENGINE=Memory;
+Warnings:
+Note	1266	Using storage engine MyISAM for table 't1'
+SHOW CREATE TABLE t1;
+Table	Create Table
+t1	CREATE TABLE `t1` (
+  `c1` int(11) NOT NULL AUTO_INCREMENT,
+  `c2` varchar(10) DEFAULT NULL,
+  PRIMARY KEY (`c1`)
+) ENGINE=MyISAM DEFAULT CHARSET=latin1
+DROP TABLE t1;
+CREATE TABLE t1 (c1 INT PRIMARY KEY AUTO_INCREMENT, c2 VARCHAR(10)) ENGINE=MyISAM;
+SHOW CREATE TABLE t1;
+Table	Create Table
+t1	CREATE TABLE `t1` (
+  `c1` int(11) NOT NULL AUTO_INCREMENT,
+  `c2` varchar(10) DEFAULT NULL,
+  PRIMARY KEY (`c1`)
+) ENGINE=MyISAM DEFAULT CHARSET=latin1
+DROP TABLE t1;
+CREATE TABLE t1 (c1 INT PRIMARY KEY AUTO_INCREMENT, c2 VARCHAR(10));
+SHOW CREATE TABLE t1;
+Table	Create Table
+t1	CREATE TABLE `t1` (
+  `c1` int(11) NOT NULL AUTO_INCREMENT,
+  `c2` varchar(10) DEFAULT NULL,
+  PRIMARY KEY (`c1`)
+) ENGINE=MyISAM DEFAULT CHARSET=latin1
+DROP TABLE t1;
+SET SESSION sql_mode='NO_ENGINE_SUBSTITUTION';
+CREATE TABLE t1 (c1 INT PRIMARY KEY AUTO_INCREMENT, c2 VARCHAR(10)) ENGINE=MyISAM;
+SHOW CREATE TABLE t1;
+Table	Create Table
+t1	CREATE TABLE `t1` (
+  `c1` int(11) NOT NULL AUTO_INCREMENT,
+  `c2` varchar(10) DEFAULT NULL,
+  PRIMARY KEY (`c1`)
+) ENGINE=MyISAM DEFAULT CHARSET=latin1
+INSERT INTO t1 values (1,'abba');
+CREATE TABLE t2 (c1 INT PRIMARY KEY AUTO_INCREMENT, c2 VARCHAR(10)) ENGINE=Memory;
+ERROR 42000: Unknown storage engine 'MEMORY'
+SET SESSION sql_mode='';
+SET SESSION enforce_storage_engine=MyISAM;
+select @@session.enforce_storage_engine;
+@@session.enforce_storage_engine
+MyISAM
+select * from t1;
+c1	c2
+1	abba
+drop table t1;
+CREATE TABLE t1 (c1 INT PRIMARY KEY AUTO_INCREMENT, c2 VARCHAR(10));
+SHOW CREATE TABLE t1;
+Table	Create Table
+t1	CREATE TABLE `t1` (
+  `c1` int(11) NOT NULL AUTO_INCREMENT,
+  `c2` varchar(10) DEFAULT NULL,
+  PRIMARY KEY (`c1`)
+) ENGINE=MyISAM DEFAULT CHARSET=latin1
+DROP TABLE t1;
+SET SESSION enforce_storage_engine=FooBar;
+ERROR 42000: Unknown storage engine 'FooBar'
+select @@session.enforce_storage_engine;
+@@session.enforce_storage_engine
+MyISAM
+SET SESSION enforce_storage_engine=MyISAM;
+ERROR 42000: Access denied; you need (at least one of) the SUPER privilege(s) for this operation
+SET SESSION enforce_storage_engine=NULL;
+SET SESSION sql_mode='NO_ENGINE_SUBSTITUTION';
+CREATE TABLE t1 (c1 INT PRIMARY KEY AUTO_INCREMENT, c2 VARCHAR(10)) ENGINE=Memory;
+SHOW CREATE TABLE t1;
+Table	Create Table
+t1	CREATE TABLE `t1` (
+  `c1` int(11) NOT NULL AUTO_INCREMENT,
+  `c2` varchar(10) DEFAULT NULL,
+  PRIMARY KEY (`c1`)
+) ENGINE=MEMORY DEFAULT CHARSET=latin1
+DROP TABLE t1;
+CREATE TABLE t1 (c1 INT PRIMARY KEY AUTO_INCREMENT, c2 VARCHAR(10)) ENGINE=MyISAM;
+SHOW CREATE TABLE t1;
+Table	Create Table
+t1	CREATE TABLE `t1` (
+  `c1` int(11) NOT NULL AUTO_INCREMENT,
+  `c2` varchar(10) DEFAULT NULL,
+  PRIMARY KEY (`c1`)
+) ENGINE=MyISAM DEFAULT CHARSET=latin1
+DROP TABLE t1;
+CREATE TABLE t1 (c1 INT PRIMARY KEY AUTO_INCREMENT, c2 VARCHAR(10));
+SHOW CREATE TABLE t1;
+Table	Create Table
+t1	CREATE TABLE `t1` (
+  `c1` int(11) NOT NULL AUTO_INCREMENT,
+  `c2` varchar(10) DEFAULT NULL,
+  PRIMARY KEY (`c1`)
+) ENGINE=MyISAM DEFAULT CHARSET=latin1
+DROP TABLE t1;
+SET GLOBAL enforce_storage_engine=NULL;
+ERROR HY000: Variable 'enforce_storage_engine' is a SESSION variable and can't be used with SET GLOBAL
diff --git a/mysql-test/r/mysqld--help.result b/mysql-test/r/mysqld--help.result
index 3036700be6f..7d59ecd1dc2 100644
--- a/mysql-test/r/mysqld--help.result
+++ b/mysql-test/r/mysqld--help.result
@@ -169,6 +169,8 @@ The following options may be given as the first argument:
  Which encryption algorithm to use for table encryption.
  aes_cbc is the recommended one.. One of: none, aes_ecb, 
  aes_cbc, aes_ctr
+ --enforce-storage-engine=name 
+ Force the use of a storage engine for new tables
  --event-scheduler[=name] 
  Enable the event scheduler. Possible values are ON, OFF,
  and DISABLED (keep the event scheduler completely
@@ -1150,6 +1152,7 @@ delayed-queue-size 1000
 div-precision-increment 4
 encrypt-tmp-disk-tables FALSE
 encryption-algorithm none
+enforce-storage-engine (No default value)
 event-scheduler OFF
 expensive-subquery-limit 100
 expire-logs-days 0