MDEV-18215: mariabackup does not report unknown command line options

MDEV-21298: mariabackup doesn't read from the [mariadbd] and [mariadbd-X.Y]
server option groups from configuration files
MDEV-21301: mariabackup doesn't read [mariadb-backup] option group in
configuration file

All three issues require to change the same code, that is why their
fixes are joined in one commit.

The fix is in invoking load_defaults_or_exit() and handle_options() for
backup-specific groups separately from client-server groups to let the last
handle_options() call fail on unknown backup-specific options.

The option values from backup-specific groups can overwrite option
values from client-server groups.

The MTR tests which contained not supported options are also fixed.

extra/mariabackup/xtrabackup.cc

@@ -1617,24 +1617,11 @@ static int prepare_export()
   return err;
 }
 
+static const char *xb_client_default_groups[]= {
+    "client", "client-server", "client-mariadb", "mariadb-client", 0, 0, 0};
 
-static const char *xb_client_default_groups[]={
-   "xtrabackup", "mariabackup",
-   "client", "client-server",
-   "client-mariadb",
-   0, 0, 0
-};
-
-static const char *xb_server_default_groups[]={
-   "xtrabackup", "mariabackup",
-   "mysqld", "server", MYSQL_BASE_VERSION,
-   "mariadb", MARIADB_BASE_VERSION,
-   "client-server",
-   #ifdef WITH_WSREP
-   "galera",
-   #endif
-   0, 0, 0
-};
+static const char *backup_default_groups[]= {
+    "xtrabackup", "mariabackup", "mariadb-backup", 0, 0, 0};
 
 static void print_version(void)
 {
@@ -1662,7 +1649,7 @@ GNU General Public License for more details.\n\
 You can download full text of the license on http://www.gnu.org/licenses/gpl-2.0.txt\n");
 
   printf("Usage: %s [--defaults-file=#] [--backup | --prepare | --copy-back | --move-back] [OPTIONS]\n",my_progname);
-  print_defaults("my", xb_server_default_groups);
+  print_defaults("my", load_default_groups);
   my_print_help(xb_client_options);
   my_print_help(xb_server_options);
   my_print_variables(xb_server_options);
@@ -5990,11 +5977,10 @@ void setup_error_messages()
 	  die("could not initialize error messages");
 }
 
-void
-handle_options(int argc, char **argv, char ***argv_client, char ***argv_server)
+void handle_options(int argc, char **argv, char ***argv_server,
+                    char ***argv_client, char ***argv_backup)
 {
 	/* Setup some variables for Innodb.*/
-
 	srv_operation = SRV_OPERATION_RESTORE;
 
 	files_charset_info = &my_charset_utf8_general_ci;
@@ -6023,8 +6009,18 @@ handle_options(int argc, char **argv, char ***argv_client, char ***argv_server)
 	char	conf_file[FN_REFLEN];
 	int	argc_client = argc;
 	int	argc_server = argc;
+        int argc_backup= argc;
+
+        // array_elements() will not work for load_defaults, as it is defined
+        // as external symbol, so let's use dynamic array to have ability to
+        // add new server default groups
+        std::vector<const char *> server_default_groups;
+
+        for (const char **default_group= load_default_groups; *default_group;
+             ++default_group)
+          server_default_groups.push_back(*default_group);
 
-	/* scan options for group and config file to load defaults from */
+/* scan options for group and config file to load defaults from */
 	for (i = 1; i < argc; i++) {
 
 		char *optend = strcend(argv[i], '=');
@@ -6032,9 +6028,7 @@ handle_options(int argc, char **argv, char ***argv_client, char ***argv_server)
 		if (strncmp(argv[i], "--defaults-group",
 			    optend - argv[i]) == 0) {
 			defaults_group = optend + 1;
-			append_defaults_group(defaults_group,
-				xb_server_default_groups,
-				array_elements(xb_server_default_groups));
+                        server_default_groups.push_back(defaults_group);
 		}
 
 		if (strncmp(argv[i], "--login-path",
@@ -6064,6 +6058,7 @@ handle_options(int argc, char **argv, char ***argv_client, char ***argv_server)
 		}
 	}
 
+        server_default_groups.push_back(NULL);
 	snprintf(conf_file, sizeof(conf_file), "my");
 
 	if (prepare && target_dir) {
@@ -6081,7 +6076,9 @@ handle_options(int argc, char **argv, char ***argv_client, char ***argv_server)
 
 	*argv_client = argv;
 	*argv_server = argv;
-	load_defaults_or_exit(conf_file, xb_server_default_groups,
+        *argv_backup = argv;
+
+        load_defaults_or_exit(conf_file, &server_default_groups[0],
                               &argc_server, argv_server);
 
 	int n;
@@ -6131,8 +6128,6 @@ handle_options(int argc, char **argv, char ***argv_client, char ***argv_server)
  	argc_client = n;
 
 	if (innobackupex_mode && argc_client > 0) {
-		/* emulate innobackupex script */
-		innobackupex_mode = true;
 		if (!ibx_handle_options(&argc_client, argv_client)) {
 			exit(EXIT_FAILURE);
 		}
@@ -6143,18 +6138,50 @@ handle_options(int argc, char **argv, char ***argv_client, char ***argv_server)
 					xb_client_options, xb_get_one_option)))
 		exit(ho_error);
 
+        load_defaults_or_exit(conf_file, backup_default_groups, &argc_backup,
+                              argv_backup);
+        for (n= 0; (*argv_backup)[n]; n++)
+        {
+        };
+        argc_backup= n;
+
+        my_handle_options_init_variables = FALSE;
+
+        if (argc_backup > 0 &&
+            (ho_error= handle_options(&argc_backup, argv_backup,
+                                      xb_server_options, xb_get_one_option)))
+          exit(ho_error);
+
+        /* Add back the program name handle_options removes */
+        ++argc_backup;
+        --(*argv_backup);
+
+        if (innobackupex_mode && argc_backup > 0 &&
+            !ibx_handle_options(&argc_backup, argv_backup))
+          exit(EXIT_FAILURE);
+
+        my_getopt_skip_unknown = FALSE;
+
+        if (argc_backup > 0 &&
+            (ho_error= handle_options(&argc_backup, argv_backup,
+                                      xb_client_options, xb_get_one_option)))
+          exit(ho_error);
+
+        my_getopt_skip_unknown = TRUE;
+        my_handle_options_init_variables = TRUE;
+
 	/* Reject command line arguments that don't look like options, i.e. are
 	not of the form '-X' (single-character options) or '--option' (long
 	options) */
-	for (int i = 0 ; i < argc_client ; i++) {
-		const char * const opt = (*argv_client)[i];
+	for (int i = 0 ; i < argc_backup ; i++) {
+		const char * const opt = (*argv_backup)[i];
 
 		if (strncmp(opt, "--", 2) &&
 		    !(strlen(opt) == 2 && opt[0] == '-')) {
 			bool server_option = true;
 
-			for (int j = 0; j < argc_server; j++) {
-				if (opt == (*argv_server)[j]) {
+			for (int j = 0; j < argc_backup; j++) {
+				if (opt == (*argv_backup)[j]) {
 					server_option = false;
 					break;
 				}
@@ -6175,7 +6202,9 @@ static int get_exepath(char *buf, size_t size, const char *argv0);
 /* ================= main =================== */
 int main(int argc, char **argv)
 {
-	char **client_defaults, **server_defaults;
+  char **server_defaults;
+  char **client_defaults;
+  char **backup_defaults;
 
 	if (get_exepath(mariabackup_exe,FN_REFLEN, argv[0]))
     strncpy(mariabackup_exe,argv[0], FN_REFLEN-1);
@@ -6229,7 +6258,8 @@ int main(int argc, char **argv)
 	mysql_mutex_init(key_LOCK_error_log, &LOCK_error_log,
 			 MY_MUTEX_INIT_FAST);
 
-	handle_options(argc, argv, &client_defaults, &server_defaults);
+        handle_options(argc, argv, &server_defaults, &client_defaults,
+                       &backup_defaults);
 
 #ifndef DBUG_OFF
 	if (dbug_option) {
@@ -6246,8 +6276,9 @@ int main(int argc, char **argv)
 		ibx_cleanup();
 	}
 
-	free_defaults(client_defaults);
 	free_defaults(server_defaults);
+        free_defaults(client_defaults);
+        free_defaults(backup_defaults);
 
 #ifndef DBUG_OFF
 	if (dbug_option) {

include/my_getopt.h

@@ -106,6 +106,7 @@ extern char *autoset_my_option;
 extern my_bool my_getopt_print_errors;
 extern my_bool my_getopt_skip_unknown;
 extern my_bool my_getopt_prefix_matching;
+extern my_bool my_handle_options_init_variables;
 extern my_error_reporter my_getopt_error_reporter;
 
 extern int handle_options (int *argc, char ***argv, 

mysql-test/suite/mariabackup/apply-log-only-incr.test

@@ -36,7 +36,7 @@ connection default;
 
 --disable_result_log
 exec $XTRABACKUP --defaults-file=$MYSQLTEST_VARDIR/my.cnf  --backup --ftwrl-wait-timeout=5 --ftwrl-wait-threshold=300 --ftwrl-wait-query-type=all --target-dir=$incremental_dir --incremental-basedir=$basedir ;
-exec $XTRABACKUP --prepare --verbose --apply-log-only --target-dir=$basedir ;
+exec $XTRABACKUP --prepare --verbose --target-dir=$basedir ;
 --enable_result_log
 
 let SEARCH_FILE=$MYSQLTEST_VARDIR/log/current_test;
@@ -44,7 +44,7 @@ let SEARCH_FILE=$MYSQLTEST_VARDIR/log/current_test;
 --source include/search_pattern_in_file.inc
 --echo # expect NOT FOUND
 
-exec $XTRABACKUP --prepare --verbose --apply-log-only --target-dir=$basedir --incremental-dir=$incremental_dir ;
+exec $XTRABACKUP --prepare --verbose --target-dir=$basedir --incremental-dir=$incremental_dir ;
 
 --source include/search_pattern_in_file.inc
 --echo # expect NOT FOUND

mysql-test/suite/mariabackup/apply-log-only.test

@@ -11,7 +11,7 @@ INSERT INTO t VALUES(1);
 exec $XTRABACKUP --defaults-file=$MYSQLTEST_VARDIR/my.cnf  --backup --target-dir=$basedir;
 --enable_result_log
 
-exec $XTRABACKUP --prepare --apply-log-only --target-dir=$basedir ;
+exec $XTRABACKUP --prepare --target-dir=$basedir ;
 
 let SEARCH_FILE=$MYSQLTEST_VARDIR/log/current_test;
 --let SEARCH_PATTERN= Rolled back recovered transaction

mysql-test/suite/mariabackup/binlog.test

@@ -12,7 +12,7 @@ SHOW VARIABLES like 'log_bin';
 exec $XTRABACKUP --defaults-file=$MYSQLTEST_VARDIR/my.cnf  --backup --target-dir=$basedir;
 --enable_result_log
 
-exec $XTRABACKUP --prepare --binlog-info=1 --apply-log-only --target-dir=$basedir ;
+exec $XTRABACKUP --prepare --binlog-info=1 --target-dir=$basedir ;
 
 let SEARCH_FILE=$MYSQLTEST_VARDIR/log/current_test;
 --let SEARCH_PATTERN= Last binlog file .*, position .*

mysql-test/suite/mariabackup/incremental_ddl_before_backup.test

@@ -33,7 +33,7 @@ select count(*) from t7;
 exec $XTRABACKUP --defaults-file=$MYSQLTEST_VARDIR/my.cnf  --backup --target-dir=$incremental_dir --incremental-basedir=$basedir;
 
 --echo # XTRABACKUP PREPARE
-exec $XTRABACKUP --apply-log-only --prepare --target-dir=$basedir;
+exec $XTRABACKUP --prepare --target-dir=$basedir;
 
 --echo # XTRABACKUP INCREMENTAL PREPARE
 exec $XTRABACKUP --prepare --target-dir=$basedir --incremental-dir=$incremental_dir;

mysql-test/suite/mariabackup/incremental_ddl_during_backup.test

@@ -25,7 +25,7 @@ exec $XTRABACKUP --defaults-file=$MYSQLTEST_VARDIR/my.cnf  --backup --target-dir
 --let after_load_tablespaces=
 --disable_result_log
 echo # Prepare full backup, apply incremental one;
-exec $XTRABACKUP --apply-log-only --prepare --target-dir=$basedir;
+exec $XTRABACKUP --prepare --target-dir=$basedir;
 exec $XTRABACKUP --prepare --target-dir=$basedir --incremental-dir=$incremental_dir ;
 
 echo # Restore and check results;

mysql-test/suite/mariabackup/options_check.result

+# Check for unknown options in command-line
+# Check for unknown options in "mariabackup" group
+# Check for unknown options in "xtrabackup" group
+# Check for unknown options in "mariadb-backup" group
+# Check for options overwriting

mysql-test/suite/mariabackup/options_check.test

+--let $targetdir=$MYSQLTEST_VARDIR/tmp/backup
+--let $custom_cnf=$MYSQLTEST_VARDIR/tmp/custom_my.cnf
+
+--echo # Check for unknown options in command-line
+--disable_result_log
+--error 7
+exec $XTRABACKUP --defaults-file=$MYSQLTEST_VARDIR/my.cnf --backup --unknown-option=xxx --target-dir=$targetdir;
+--error 2
+exec $XTRABACKUP --defaults-file=$MYSQLTEST_VARDIR/my.cnf --backup --unknown-option --target-dir=$targetdir;
+--enable_result_log
+
+--echo # Check for unknown options in "mariabackup" group
+--write_file $custom_cnf
+[mariabackup]
+unknown-option=XXX
+EOF
+--error 7
+exec $XTRABACKUP --defaults-file=$custom_cnf --backup --target-dir=$targetdir;
+--remove_file $custom_cnf
+
+--echo # Check for unknown options in "xtrabackup" group
+--write_file $custom_cnf
+[xtrabackup]
+unknown-option=XXX
+EOF
+--error 7
+exec $XTRABACKUP --defaults-file=$custom_cnf --backup --target-dir=$targetdir;
+--remove_file $custom_cnf
+
+--echo # Check for unknown options in "mariadb-backup" group
+--write_file $custom_cnf
+[mariadb-backup]
+unknown-option=XXX
+EOF
+--error 7
+exec $XTRABACKUP --defaults-file=$custom_cnf --backup --target-dir=$targetdir;
+--remove_file $custom_cnf
+
+--echo # Check for options overwriting
+--write_file $custom_cnf
+[mariadbd]
+innodb-flush-method=O_DIRECT
+
+[mariabackup]
+innodb-flush-method=blablabla
+EOF
+--error 13
+exec $XTRABACKUP --defaults-file=$custom_cnf --backup --target-dir=$targetdir;
+--remove_file $custom_cnf
+

mysql-test/suite/mariabackup/undo_space_id.test

@@ -17,7 +17,7 @@ exec $XTRABACKUP --defaults-file=$MYSQLTEST_VARDIR/my.cnf  --backup --target-dir
 list_files $basedir undo*;
 
 --echo # xtrabackup prepare
-exec $XTRABACKUP --prepare --apply-log-only --target-dir=$basedir;
+exec $XTRABACKUP --prepare --target-dir=$basedir;
 --echo # Display undo log files from targer directory
 list_files $basedir undo*;
 

mysql-test/suite/mariabackup/xb_fulltext_encrypted.test

@@ -16,7 +16,7 @@ let $targetdir=$MYSQLTEST_VARDIR/tmp/backup;
 --disable_result_log
 
 exec $INNOBACKUPEX --defaults-file=$MYSQLTEST_VARDIR/my.cnf --no-timestamp $targetdir;
-exec $INNOBACKUPEX --apply-log --rebuild-indexes --rebuild-threads=2 $targetdir;
+exec $INNOBACKUPEX --apply-log $targetdir;
 --source include/restart_and_restore.inc
 
 --enable_result_log

mysql-test/suite/mariabackup/xb_partition.test

@@ -38,7 +38,7 @@ INSERT INTO isam_p VALUES (1), (101), (201), (301);
 let $targetdir=$MYSQLTEST_VARDIR/tmp;
 
 --disable_result_log
-exec $XTRABACKUP --defaults-file=$MYSQLTEST_VARDIR/my.cnf --no-timestamp --backup --target-dir=$targetdir/full;
+exec $XTRABACKUP --defaults-file=$MYSQLTEST_VARDIR/my.cnf --backup --target-dir=$targetdir/full;
 --enable_result_log
 
 DROP TABLE t1;

mysys/my_getopt.c

@@ -79,6 +79,12 @@ my_bool my_getopt_skip_unknown= 0;
 */
 my_bool my_getopt_prefix_matching= 1;
 
+/*
+   This is a flag that can be set in client programs. 1 means that
+   handle_options()  will not initialize options to default values.
+*/
+my_bool my_handle_options_init_variables = 1;
+
 static void default_reporter(enum loglevel level,
                              const char *format, ...)
 {
@@ -212,6 +218,7 @@ int handle_options(int *argc, char ***argv,
   DBUG_ASSERT(argv && *argv);
   (*argc)--; /* Skip the program name */
   (*argv)++; /*      --- || ----      */
+  if (my_handle_options_init_variables)
     init_variables(longopts, init_one_value);
 
   /*