MDEV-30189 Add remaining replication options as system variables

Promote the last few SQL-inaccessible replication options (command line
or `mariadb.cnf`) as these GLOBAL read-only system variables:
```
@@master_info_file
@@replicate_same_server_id
@@show_slave_auth_info
```

Side effect: The latter two options changed from no argument
to optional argument. Quote `include/my_getopt.h`:
> It should be noted that for historical reasons variables with the
> combination arg_type=NO_ARG, my_option::var_type=GET_BOOL still
> accepts arguments. This is someone counter intuitive and care should
> be taken if the code is refactored.

Reviewed-by: Brandon Nesterenko <brandon.nesterenko@mariadb.com>

mysql-test/suite/sys_vars/r/master_info_file_basic.result

@@ -0,0 +1,17 @@
+# GLOBAL scope
+SELECT @@GLOBAL.master_info_file;
+@@GLOBAL.master_info_file
+30189.info
+SELECT @@master_info_file;
+@@master_info_file
+30189.info
+# Not SESSION scope
+SELECT @@SESSION.master_info_file;
+ERROR HY000: Variable 'master_info_file' is a GLOBAL variable
+# Read-only
+SET @@master_info_file= 'master.info';
+ERROR HY000: Variable 'master_info_file' is a read only variable
+SET @@GLOBAL.master_info_file= 'master.info';
+ERROR HY000: Variable 'master_info_file' is a read only variable
+SET @@SESSION.master_info_file= 'master.info';
+ERROR HY000: Variable 'master_info_file' is a read only variable

mysql-test/suite/sys_vars/r/replicate_same_server_id_basic.result

@@ -0,0 +1,17 @@
+# GLOBAL scope
+SELECT @@GLOBAL.replicate_same_server_id;
+@@GLOBAL.replicate_same_server_id
+1
+SELECT @@replicate_same_server_id;
+@@replicate_same_server_id
+1
+# Not SESSION scope
+SELECT @@SESSION.replicate_same_server_id;
+ERROR HY000: Variable 'replicate_same_server_id' is a GLOBAL variable
+# Read-only
+SET @@replicate_same_server_id= OFF;
+ERROR HY000: Variable 'replicate_same_server_id' is a read only variable
+SET @@GLOBAL.replicate_same_server_id= OFF;
+ERROR HY000: Variable 'replicate_same_server_id' is a read only variable
+SET @@SESSION.replicate_same_server_id= OFF;
+ERROR HY000: Variable 'replicate_same_server_id' is a read only variable

mysql-test/suite/sys_vars/r/show_slave_auth_info_basic.result

@@ -0,0 +1,17 @@
+# GLOBAL scope
+SELECT @@GLOBAL.show_slave_auth_info;
+@@GLOBAL.show_slave_auth_info
+1
+SELECT @@show_slave_auth_info;
+@@show_slave_auth_info
+1
+# Not SESSION scope
+SELECT @@SESSION.show_slave_auth_info;
+ERROR HY000: Variable 'show_slave_auth_info' is a GLOBAL variable
+# Read-only
+SET @@show_slave_auth_info= OFF;
+ERROR HY000: Variable 'show_slave_auth_info' is a read only variable
+SET @@GLOBAL.show_slave_auth_info= OFF;
+ERROR HY000: Variable 'show_slave_auth_info' is a read only variable
+SET @@SESSION.show_slave_auth_info= OFF;
+ERROR HY000: Variable 'show_slave_auth_info' is a read only variable

mysql-test/suite/sys_vars/r/sysvars_server_notembedded.result

@@ -2072,6 +2072,16 @@ NUMERIC_BLOCK_SIZE	NULL
 ENUM_VALUE_LIST	OFF,ON
 READ_ONLY	NO
 COMMAND_LINE_ARGUMENT	OPTIONAL
+VARIABLE_NAME	MASTER_INFO_FILE
+VARIABLE_SCOPE	GLOBAL
+VARIABLE_TYPE	VARCHAR
+VARIABLE_COMMENT	The location and name of the file that remembers the master and where the I/O replication thread is in the master's binlogs. Defaults to master.info
+NUMERIC_MIN_VALUE	NULL
+NUMERIC_MAX_VALUE	NULL
+NUMERIC_BLOCK_SIZE	NULL
+ENUM_VALUE_LIST	NULL
+READ_ONLY	YES
+COMMAND_LINE_ARGUMENT	REQUIRED
 VARIABLE_NAME	MASTER_VERIFY_CHECKSUM
 VARIABLE_SCOPE	GLOBAL
 VARIABLE_TYPE	BOOLEAN
@@ -3752,6 +3762,16 @@ NUMERIC_BLOCK_SIZE	NULL
 ENUM_VALUE_LIST	NULL
 READ_ONLY	NO
 COMMAND_LINE_ARGUMENT	NULL
+VARIABLE_NAME	REPLICATE_SAME_SERVER_ID
+VARIABLE_SCOPE	GLOBAL
+VARIABLE_TYPE	BOOLEAN
+VARIABLE_COMMENT	In replication, if set to 1, do not skip events having our server id. Default value is 0 (to break infinite loops in circular replication). Can't be set to 1 if --log-slave-updates is used
+NUMERIC_MIN_VALUE	NULL
+NUMERIC_MAX_VALUE	NULL
+NUMERIC_BLOCK_SIZE	NULL
+ENUM_VALUE_LIST	OFF,ON
+READ_ONLY	YES
+COMMAND_LINE_ARGUMENT	OPTIONAL
 VARIABLE_NAME	REPLICATE_WILD_DO_TABLE
 VARIABLE_SCOPE	GLOBAL
 VARIABLE_TYPE	VARCHAR
@@ -4012,6 +4032,16 @@ NUMERIC_BLOCK_SIZE	NULL
 ENUM_VALUE_LIST	OFF,STATE,CHARACTERISTICS
 READ_ONLY	NO
 COMMAND_LINE_ARGUMENT	REQUIRED
+VARIABLE_NAME	SHOW_SLAVE_AUTH_INFO
+VARIABLE_SCOPE	GLOBAL
+VARIABLE_TYPE	BOOLEAN
+VARIABLE_COMMENT	Show user and password in SHOW SLAVE HOSTS on this master
+NUMERIC_MIN_VALUE	NULL
+NUMERIC_MAX_VALUE	NULL
+NUMERIC_BLOCK_SIZE	NULL
+ENUM_VALUE_LIST	OFF,ON
+READ_ONLY	YES
+COMMAND_LINE_ARGUMENT	OPTIONAL
 VARIABLE_NAME	SKIP_EXTERNAL_LOCKING
 VARIABLE_SCOPE	GLOBAL
 VARIABLE_TYPE	BOOLEAN

mysql-test/suite/sys_vars/t/master_info_file_basic.opt

@@ -0,0 +1 @@
+--master-info-file='30189.info'

mysql-test/suite/sys_vars/t/master_info_file_basic.test

@@ -0,0 +1,19 @@
+--source include/not_embedded.inc
+# MDEV-30189: Test minimal correctness of `@@master_info_file` itself
+
+--echo # GLOBAL scope
+# Expect different from default ('master.info') as configured by `.opt`
+SELECT @@GLOBAL.master_info_file;
+SELECT @@master_info_file;
+
+--echo # Not SESSION scope
+--error ER_INCORRECT_GLOBAL_LOCAL_VAR
+SELECT @@SESSION.master_info_file;
+
+--echo # Read-only
+--error ER_INCORRECT_GLOBAL_LOCAL_VAR
+SET @@master_info_file= 'master.info';
+--error ER_INCORRECT_GLOBAL_LOCAL_VAR
+SET @@GLOBAL.master_info_file= 'master.info';
+--error ER_INCORRECT_GLOBAL_LOCAL_VAR
+SET @@SESSION.master_info_file= 'master.info';

mysql-test/suite/sys_vars/t/replicate_same_server_id_basic.opt

@@ -0,0 +1 @@
+--replicate-same-server-id

mysql-test/suite/sys_vars/t/replicate_same_server_id_basic.test

@@ -0,0 +1,19 @@
+--source include/not_embedded.inc
+# MDEV-30189: Test minimal correctness of `@@replicate_same_server_id` itself
+
+--echo # GLOBAL scope
+# Expect different from default (OFF) as configured by `.opt`
+SELECT @@GLOBAL.replicate_same_server_id;
+SELECT @@replicate_same_server_id;
+
+--echo # Not SESSION scope
+--error ER_INCORRECT_GLOBAL_LOCAL_VAR
+SELECT @@SESSION.replicate_same_server_id;
+
+--echo # Read-only
+--error ER_INCORRECT_GLOBAL_LOCAL_VAR
+SET @@replicate_same_server_id= OFF;
+--error ER_INCORRECT_GLOBAL_LOCAL_VAR
+SET @@GLOBAL.replicate_same_server_id= OFF;
+--error ER_INCORRECT_GLOBAL_LOCAL_VAR
+SET @@SESSION.replicate_same_server_id= OFF;

mysql-test/suite/sys_vars/t/show_slave_auth_info_basic.opt

@@ -0,0 +1 @@
+--show-slave-auth-info

mysql-test/suite/sys_vars/t/show_slave_auth_info_basic.test

@@ -0,0 +1,19 @@
+--source include/not_embedded.inc
+# MDEV-30189: Test minimal correctness of `@@show_slave_auth_info` itself
+
+--echo # GLOBAL scope
+# Expect different from default (OFF) as configured by `.opt`
+SELECT @@GLOBAL.show_slave_auth_info;
+SELECT @@show_slave_auth_info;
+
+--echo # Not SESSION scope
+--error ER_INCORRECT_GLOBAL_LOCAL_VAR
+SELECT @@SESSION.show_slave_auth_info;
+
+--echo # Read-only
+--error ER_INCORRECT_GLOBAL_LOCAL_VAR
+SET @@show_slave_auth_info= OFF;
+--error ER_INCORRECT_GLOBAL_LOCAL_VAR
+SET @@GLOBAL.show_slave_auth_info= OFF;
+--error ER_INCORRECT_GLOBAL_LOCAL_VAR
+SET @@SESSION.show_slave_auth_info= OFF;

sql/mysqld.cc

@@ -6818,12 +6818,6 @@ struct my_option my_long_options[]=
    "more than one storage engine, when binary log is disabled)",
    &opt_tc_log_file, &opt_tc_log_file, 0, GET_STR,
    REQUIRED_ARG, 0, 0, 0, 0, 0, 0},
-  {"master-info-file", 0,
-   "The location and name of the file that remembers the master and where "
-   "the I/O replication thread is in the master's binlogs. Defaults to "
-   "master.info",
-   &master_info_file, &master_info_file, 0, GET_STR,
-   REQUIRED_ARG, 0, 0, 0, 0, 0, 0},
   {"master-retry-count", 0,
    "The number of tries the slave will make to connect to the master before giving up",
    &master_retry_count, &master_retry_count, 0, GET_ULONG,
@@ -6874,14 +6868,6 @@ struct my_option my_long_options[]=
    "Updates to a database with a different name than the original. Example: "
    "replicate-rewrite-db=master_db_name->slave_db_name",
    0, 0, 0, GET_STR | GET_ASK_ADDR, REQUIRED_ARG, 0, 0, 0, 0, 0, 0},
-#ifdef HAVE_REPLICATION
-  {"replicate-same-server-id", 0,
-   "In replication, if set to 1, do not skip events having our server id. "
-   "Default value is 0 (to break infinite loops in circular replication). "
-   "Can't be set to 1 if --log-slave-updates is used",
-   &replicate_same_server_id, &replicate_same_server_id,
-   0, GET_BOOL, NO_ARG, 0, 0, 0, 0, 0, 0},
-#endif
   {"replicate-wild-do-table", OPT_REPLICATE_WILD_DO_TABLE,
    "Tells the slave thread to restrict replication to the tables that match "
    "the specified wildcard pattern. To specify more than one table, use the "
@@ -6904,10 +6890,6 @@ struct my_option my_long_options[]=
    "Don't allow new user creation by the user who has no write privileges to the mysql.user table",
    &opt_safe_user_create, &opt_safe_user_create, 0, GET_BOOL,
    NO_ARG, 0, 0, 0, 0, 0, 0},
-  {"show-slave-auth-info", 0,
-   "Show user and password in SHOW SLAVE HOSTS on this master",
-   &opt_show_slave_auth_info, &opt_show_slave_auth_info, 0,
-   GET_BOOL, NO_ARG, 0, 0, 0, 0, 0, 0},
   {"silent-startup", OPT_SILENT, "Don't print [Note] to the error log during startup",
    &opt_silent_startup, &opt_silent_startup, 0, GET_BOOL, NO_ARG, 0, 0, 0, 0, 0, 0},
   {"skip-host-cache", OPT_SKIP_HOST_CACHE, "Don't cache host names", 0, 0, 0,

sql/sys_vars.cc

@@ -5306,6 +5306,12 @@ static Sys_var_uint Sys_repl_report_port(
        "to the slave. If not sure, leave this option unset",
        READ_ONLY GLOBAL_VAR(report_port), CMD_LINE(REQUIRED_ARG),
        VALID_RANGE(0, UINT_MAX), DEFAULT(0), BLOCK_SIZE(1));
+
+static Sys_var_mybool Sys_show_slave_auth_info(
+       "show_slave_auth_info",
+       "Show user and password in SHOW SLAVE HOSTS on this master",
+       READ_ONLY GLOBAL_VAR(opt_show_slave_auth_info), CMD_LINE(OPT_ARG),
+       DEFAULT(FALSE));
 #endif
 
 static Sys_var_mybool Sys_keep_files_on_create(
@@ -5706,6 +5712,13 @@ static Sys_var_charptr_fscs Sys_relay_log_info_file(
        READ_ONLY GLOBAL_VAR(relay_log_info_file), CMD_LINE(REQUIRED_ARG),
        DEFAULT(0));
 
+static Sys_var_charptr_fscs Sys_master_info_file(
+       "master_info_file", "The location and name of the file that "
+       "remembers the master and where the I/O replication thread "
+       "is in the master's binlogs. Defaults to master.info",
+       READ_ONLY GLOBAL_VAR(master_info_file), CMD_LINE(REQUIRED_ARG),
+       DEFAULT(0));
+
 static Sys_var_on_access_global<Sys_var_mybool,
                                 PRIV_SET_SYSTEM_GLOBAL_VAR_RELAY_LOG_PURGE>
 Sys_relay_log_purge(
@@ -6979,6 +6992,14 @@ static Sys_var_mybool Sys_replicate_annotate_row_events(
        "to its own binary log. Ignored if log_slave_updates is not set",
        READ_ONLY GLOBAL_VAR(opt_replicate_annotate_row_events),
        CMD_LINE(OPT_ARG), DEFAULT(TRUE));
+
+static Sys_var_mybool Sys_replicate_same_server_id(
+       "replicate_same_server_id",
+       "In replication, if set to 1, do not skip events having our server id. "
+       "Default value is 0 (to break infinite loops in circular replication). "
+       "Can't be set to 1 if --log-slave-updates is used",
+       READ_ONLY GLOBAL_VAR(replicate_same_server_id),
+       CMD_LINE(OPT_ARG), DEFAULT(FALSE));
 #endif
 
 static Sys_var_ulonglong Sys_join_buffer_space_limit(