create user foo@localhost;
create role role1;
create role role2;
create role role3;
create role role4;
create role role5;
create role role6;
create role role7;
create role role8;
create role role9;
create role role10;
grant role1 to role2;
grant role2 to role4;
grant role2 to role5;
grant role3 to role5;
grant role4 to role6;
grant role5 to role6;
grant role5 to role7;
grant role6 to role8;
grant role6 to role9;
grant role7 to role9;
grant role9 to role10;
grant role10 to foo@localhost;
grant role10 to role2;
ERROR HY000: Cannot grant role 'role10' to: 'role2'
connect  foo, localhost, foo;
show grants;
Grants for foo@localhost
GRANT USAGE ON *.* TO `foo`@`localhost`
GRANT `role10` TO `foo`@`localhost`
select * from information_schema.applicable_roles;
GRANTEE	ROLE_NAME	IS_GRANTABLE	IS_DEFAULT
foo@localhost	role10	NO	NO
role10	role9	NO	NULL
role2	role1	NO	NULL
role4	role2	NO	NULL
role5	role2	NO	NULL
role5	role3	NO	NULL
role6	role4	NO	NULL
role6	role5	NO	NULL
role7	role5	NO	NULL
role9	role6	NO	NULL
role9	role7	NO	NULL
show status like 'debug%';
Variable_name	Value
connection default;
grant select on *.* to role1;
show status like 'debug%';
Variable_name	Value
connection foo;
select count(*) from mysql.roles_mapping;
ERROR 42000: SELECT command denied to user 'foo'@'localhost' for table 'roles_mapping'
set role role10;
select count(*) from mysql.roles_mapping;
count(*)
22
show grants;
Grants for foo@localhost
GRANT SELECT ON *.* TO `role1`
GRANT USAGE ON *.* TO `foo`@`localhost`
GRANT USAGE ON *.* TO `role10`
GRANT USAGE ON *.* TO `role2`
GRANT USAGE ON *.* TO `role3`
GRANT USAGE ON *.* TO `role4`
GRANT USAGE ON *.* TO `role5`
GRANT USAGE ON *.* TO `role6`
GRANT USAGE ON *.* TO `role7`
GRANT USAGE ON *.* TO `role9`
GRANT `role10` TO `foo`@`localhost`
GRANT `role1` TO `role2`
GRANT `role2` TO `role4`
GRANT `role2` TO `role5`
GRANT `role3` TO `role5`
GRANT `role4` TO `role6`
GRANT `role5` TO `role6`
GRANT `role5` TO `role7`
GRANT `role6` TO `role9`
GRANT `role7` TO `role9`
GRANT `role9` TO `role10`
select * from information_schema.enabled_roles;
ROLE_NAME
role1
role10
role2
role3
role4
role5
role6
role7
role9
connection default;
revoke select on *.* from role1;
show status like 'debug%';
Variable_name	Value
connection foo;
select count(*) from mysql.roles_mapping;
count(*)
22
set role none;
set role role10;
select count(*) from mysql.roles_mapping;
ERROR 42000: SELECT command denied to user 'foo'@'localhost' for table 'roles_mapping'
set role none;
connection default;
grant select on mysql.* to role1;
show status like 'debug%';
Variable_name	Value
connection foo;
select count(*) from mysql.roles_mapping;
ERROR 42000: SELECT command denied to user 'foo'@'localhost' for table 'roles_mapping'
set role role10;
select count(*) from mysql.roles_mapping;
count(*)
22
show grants;
Grants for foo@localhost
GRANT SELECT ON `mysql`.* TO `role1`
GRANT USAGE ON *.* TO `foo`@`localhost`
GRANT USAGE ON *.* TO `role10`
GRANT USAGE ON *.* TO `role1`
GRANT USAGE ON *.* TO `role2`
GRANT USAGE ON *.* TO `role3`
GRANT USAGE ON *.* TO `role4`
GRANT USAGE ON *.* TO `role5`
GRANT USAGE ON *.* TO `role6`
GRANT USAGE ON *.* TO `role7`
GRANT USAGE ON *.* TO `role9`
GRANT `role10` TO `foo`@`localhost`
GRANT `role1` TO `role2`
GRANT `role2` TO `role4`
GRANT `role2` TO `role5`
GRANT `role3` TO `role5`
GRANT `role4` TO `role6`
GRANT `role5` TO `role6`
GRANT `role5` TO `role7`
GRANT `role6` TO `role9`
GRANT `role7` TO `role9`
GRANT `role9` TO `role10`
connection default;
revoke select on mysql.* from role1;
show status like 'debug%';
Variable_name	Value
connection foo;
select count(*) from mysql.roles_mapping;
ERROR 42000: SELECT command denied to user 'foo'@'localhost' for table 'roles_mapping'
set role none;
connection default;
grant select on mysql.roles_mapping to role1;
show status like 'debug%';
Variable_name	Value
connection foo;
select count(*) from mysql.roles_mapping;
ERROR 42000: SELECT command denied to user 'foo'@'localhost' for table 'roles_mapping'
set role role10;
select count(*) from mysql.roles_mapping;
count(*)
22
show grants;
Grants for foo@localhost
GRANT SELECT ON `mysql`.`roles_mapping` TO `role1`
GRANT USAGE ON *.* TO `foo`@`localhost`
GRANT USAGE ON *.* TO `role10`
GRANT USAGE ON *.* TO `role1`
GRANT USAGE ON *.* TO `role2`
GRANT USAGE ON *.* TO `role3`
GRANT USAGE ON *.* TO `role4`
GRANT USAGE ON *.* TO `role5`
GRANT USAGE ON *.* TO `role6`
GRANT USAGE ON *.* TO `role7`
GRANT USAGE ON *.* TO `role9`
GRANT `role10` TO `foo`@`localhost`
GRANT `role1` TO `role2`
GRANT `role2` TO `role4`
GRANT `role2` TO `role5`
GRANT `role3` TO `role5`
GRANT `role4` TO `role6`
GRANT `role5` TO `role6`
GRANT `role5` TO `role7`
GRANT `role6` TO `role9`
GRANT `role7` TO `role9`
GRANT `role9` TO `role10`
connection default;
revoke select on mysql.roles_mapping from role1;
show status like 'debug%';
Variable_name	Value
connection foo;
select count(*) from mysql.roles_mapping;
ERROR 42000: SELECT command denied to user 'foo'@'localhost' for table 'roles_mapping'
set role none;
connection default;
grant select(User) on mysql.roles_mapping to role1;
show status like 'debug%';
Variable_name	Value
connection foo;
select count(*) from mysql.roles_mapping;
ERROR 42000: SELECT command denied to user 'foo'@'localhost' for table 'roles_mapping'
set role role10;
select count(concat(User,Host,Role)) from mysql.roles_mapping;
ERROR 42000: SELECT command denied to user 'foo'@'localhost' for column 'Host' in table 'roles_mapping'
select count(concat(User)) from mysql.roles_mapping;
count(concat(User))
22
show grants;
Grants for foo@localhost
GRANT SELECT (User) ON `mysql`.`roles_mapping` TO `role1`
GRANT USAGE ON *.* TO `foo`@`localhost`
GRANT USAGE ON *.* TO `role10`
GRANT USAGE ON *.* TO `role1`
GRANT USAGE ON *.* TO `role2`
GRANT USAGE ON *.* TO `role3`
GRANT USAGE ON *.* TO `role4`
GRANT USAGE ON *.* TO `role5`
GRANT USAGE ON *.* TO `role6`
GRANT USAGE ON *.* TO `role7`
GRANT USAGE ON *.* TO `role9`
GRANT `role10` TO `foo`@`localhost`
GRANT `role1` TO `role2`
GRANT `role2` TO `role4`
GRANT `role2` TO `role5`
GRANT `role3` TO `role5`
GRANT `role4` TO `role6`
GRANT `role5` TO `role6`
GRANT `role5` TO `role7`
GRANT `role6` TO `role9`
GRANT `role7` TO `role9`
GRANT `role9` TO `role10`
connection default;
grant select(Host) on mysql.roles_mapping to role3;
show status like 'debug%';
Variable_name	Value
connection foo;
select count(concat(User,Host,Role)) from mysql.roles_mapping;
ERROR 42000: SELECT command denied to user 'foo'@'localhost' for column 'Role' in table 'roles_mapping'
select count(concat(User,Host)) from mysql.roles_mapping;
count(concat(User,Host))
22
show grants;
Grants for foo@localhost
GRANT SELECT (Host) ON `mysql`.`roles_mapping` TO `role3`
GRANT SELECT (User) ON `mysql`.`roles_mapping` TO `role1`
GRANT USAGE ON *.* TO `foo`@`localhost`
GRANT USAGE ON *.* TO `role10`
GRANT USAGE ON *.* TO `role1`
GRANT USAGE ON *.* TO `role2`
GRANT USAGE ON *.* TO `role3`
GRANT USAGE ON *.* TO `role4`
GRANT USAGE ON *.* TO `role5`
GRANT USAGE ON *.* TO `role6`
GRANT USAGE ON *.* TO `role7`
GRANT USAGE ON *.* TO `role9`
GRANT `role10` TO `foo`@`localhost`
GRANT `role1` TO `role2`
GRANT `role2` TO `role4`
GRANT `role2` TO `role5`
GRANT `role3` TO `role5`
GRANT `role4` TO `role6`
GRANT `role5` TO `role6`
GRANT `role5` TO `role7`
GRANT `role6` TO `role9`
GRANT `role7` TO `role9`
GRANT `role9` TO `role10`
connection default;
revoke select(User) on mysql.roles_mapping from role1;
show status like 'debug%';
Variable_name	Value
connection foo;
select count(concat(User,Host)) from mysql.roles_mapping;
ERROR 42000: SELECT command denied to user 'foo'@'localhost' for column 'User' in table 'roles_mapping'
select count(concat(Host)) from mysql.roles_mapping;
count(concat(Host))
22
connection default;
revoke select(Host) on mysql.roles_mapping from role3;
show status like 'debug%';
Variable_name	Value
connection foo;
select count(concat(Host)) from mysql.roles_mapping;
ERROR 42000: SELECT command denied to user 'foo'@'localhost' for table 'roles_mapping'
set role none;
connection default;
create procedure pr1() select "pr1";
create function fn1() returns char(10) return "fn1";
grant execute on procedure test.pr1 to role1;
show status like 'debug%';
Variable_name	Value
connection foo;
call pr1();
ERROR 42000: execute command denied to user 'foo'@'localhost' for routine 'test.pr1'
set role role10;
call pr1();
pr1
pr1
select fn1();
ERROR 42000: execute command denied to user 'foo'@'localhost' for routine 'test.fn1'
connection default;
grant execute on function test.fn1 to role5;
show status like 'debug%';
Variable_name	Value
connection foo;
select fn1();
fn1()
fn1
connection default;
revoke execute on procedure test.pr1 from role1;
show status like 'debug%';
Variable_name	Value
connection foo;
call pr1();
ERROR 42000: execute command denied to user 'foo'@'localhost' for routine 'test.pr1'
select fn1();
fn1()
fn1
connection default;
revoke execute on function test.fn1 from role5;
show status like 'debug%';
Variable_name	Value
connection foo;
select fn1();
ERROR 42000: execute command denied to user 'foo'@'localhost' for routine 'test.fn1'
set role none;
connection default;
drop procedure pr1;
drop function fn1;
grant select on mysql.roles_mapping to role3;
show status like 'debug%';
Variable_name	Value
grant select on mysql.roles_mapping to role1;
show status like 'debug%';
Variable_name	Value
revoke select on mysql.roles_mapping from role3;
show status like 'debug%';
Variable_name	Value
revoke select on mysql.roles_mapping from role1;
show status like 'debug%';
Variable_name	Value
grant select on mysql.* to role1;
show status like 'debug%';
Variable_name	Value
grant select on test.* to role1;
show status like 'debug%';
Variable_name	Value
revoke select on mysql.* from role1;
show status like 'debug%';
Variable_name	Value
revoke select on test.* from role1;
show status like 'debug%';
Variable_name	Value
connection default;
drop user foo@localhost;
drop role role1;
drop role role2;
drop role role3;
drop role role4;
drop role role5;
drop role role6;
drop role role7;
drop role role8;
drop role role9;
drop role role10;