Always lowercase database names from 'host' and 'db' grant tables when they

are loaded and lower_case_table_names is set, but issue a warning when it is
done. (Bug #7989)


sql/sql_acl.cc:
  Lowercase database names in 'host' and 'db' grant tables when loading,
  but issue a warning to the log about them.

mysql-test/r/lowercase_table_grant.result

+use mysql;
+create database MYSQLtest;
+grant all on MySQLtest.* to mysqltest_1@localhost;
+show grants for mysqltest_1@localhost;
+Grants for mysqltest_1@localhost
+GRANT USAGE ON *.* TO 'mysqltest_1'@'localhost'
+GRANT ALL PRIVILEGES ON `mysqltest`.* TO 'mysqltest_1'@'localhost'
+select * from db where user = 'mysqltest_1';
+Host	Db	User	Select_priv	Insert_priv	Update_priv	Delete_priv	Create_priv	Drop_priv	Grant_priv	References_priv	Index_priv	Alter_priv	Create_tmp_table_priv	Lock_tables_priv
+localhost	mysqltest	mysqltest_1	Y	Y	Y	Y	Y	Y	N	Y	Y	Y	Y	Y
+update db set db = 'MYSQLtest' where db = 'mysqltest' and user = 'mysqltest_1' and host = 'localhost';
+flush privileges;
+show grants for mysqltest_1@localhost;
+Grants for mysqltest_1@localhost
+GRANT USAGE ON *.* TO 'mysqltest_1'@'localhost'
+GRANT ALL PRIVILEGES ON `mysqltest`.* TO 'mysqltest_1'@'localhost'
+select * from db where user = 'mysqltest_1';
+Host	Db	User	Select_priv	Insert_priv	Update_priv	Delete_priv	Create_priv	Drop_priv	Grant_priv	References_priv	Index_priv	Alter_priv	Create_tmp_table_priv	Lock_tables_priv
+localhost	MYSQLtest	mysqltest_1	Y	Y	Y	Y	Y	Y	N	Y	Y	Y	Y	Y
+delete from db where db = 'MYSQLtest' and user = 'mysqltest_1' and host = 'localhost';
+flush privileges;
+drop user mysqltest_1@localhost;
+drop database MYSQLtest;

mysql-test/t/lowercase_table_grant-master.opt

+--lower_case_table_names

mysql-test/t/lowercase_table_grant.test

+# Test of grants when lower_case_table_names is on
+use mysql;
+
+# mixed-case database name for testing
+create database MYSQLtest;
+
+# check that database name gets forced to lowercase
+grant all on MySQLtest.* to mysqltest_1@localhost;
+show grants for mysqltest_1@localhost;
+
+# now force it to mixed case, but see that it is lowercased in the acl cache
+select * from db where user = 'mysqltest_1';
+update db set db = 'MYSQLtest' where db = 'mysqltest' and user = 'mysqltest_1' and host = 'localhost';
+flush privileges;
+show grants for mysqltest_1@localhost;
+select * from db where user = 'mysqltest_1';
+
+# clear out the user we created
+#
+# can't use REVOKE because of the mixed-case database name
+delete from db where db = 'MYSQLtest' and user = 'mysqltest_1' and host = 'localhost';
+flush privileges;
+drop user mysqltest_1@localhost;
+
+drop database MYSQLtest;

sql/sql_acl.cc

@@ -139,6 +139,7 @@ my_bool acl_init(THD *org_thd, bool dont_read_acl_tables)
   MYSQL_LOCK *lock;
   my_bool return_val=1;
   bool check_no_resolve= specialflag & SPECIAL_NO_RESOLVE;
+  char tmp_name[NAME_LEN+1];
 
   DBUG_ENTER("acl_init");
 
@@ -197,6 +198,24 @@ my_bool acl_init(THD *org_thd, bool dont_read_acl_tables)
     ACL_HOST host;
     update_hostname(&host.host,get_field(&mem, table->field[0]));
     host.db=	 get_field(&mem, table->field[1]);
+    if (lower_case_table_names)
+    {
+      /*
+       We make a temporary copy of the database, force it to lower case,
+       and then copy it back over the original name. We can't just update
+       the host.db pointer, because tmp_name is allocated on the stack.
+      */
+      (void)strmov(tmp_name, host.db);
+      my_casedn_str(files_charset_info, tmp_name);
+      if (strcmp(host.db, tmp_name) != 0)
+      {
+        sql_print_warning("'host' entry '%s|%s' had database in mixed "
+                          "case that has been forced to lowercase because "
+                          "lower_case_table_names is set.",
+                          host.host.hostname, host.db);
+        (void)strmov(host.db, tmp_name);
+      }
+    }
     host.access= get_access(table,2);
     host.access= fix_rights_for_db(host.access);
     host.sort=	 get_sort(2,host.host.hostname,host.db);
@@ -380,6 +399,24 @@ my_bool acl_init(THD *org_thd, bool dont_read_acl_tables)
     }
     db.access=get_access(table,3);
     db.access=fix_rights_for_db(db.access);
+    if (lower_case_table_names)
+    {
+      /*
+       We make a temporary copy of the database, force it to lower case,
+       and then copy it back over the original name. We can't just update
+       the db.db pointer, because tmp_name is allocated on the stack.
+      */
+      (void)strmov(tmp_name, db.db);
+      my_casedn_str(files_charset_info, tmp_name);
+      if (strcmp(db.db, tmp_name) != 0)
+      {
+        sql_print_warning("'db' entry '%s %s@%s' had database in mixed "
+                          "case that has been forced to lowercase because "
+                          "lower_case_table_names is set.",
+		          db.db, db.user, db.host.hostname, db.host.hostname);
+        (void)strmov(db.db, tmp_name);
+      }
+    }
     db.sort=get_sort(3,db.host.hostname,db.db,db.user);
 #ifndef TO_BE_REMOVED
     if (table->fields <=  9)