MDEV-19347: Mariabackup does not honor ignore_db_dirs from serverbb-10.2-MDEV-19347-ignore_db_dirs

config.

The solution is to read the system variable value on startup and to fill
databases_exclude_hash.

xb_load_list_string() became non-static and was reformatted. The system
variable value is read and processed in get_mysql_vars(), which was also
reformatted.

3 files changed, 208 insertions, 177 deletions

diff --git a/extra/mariabackup/backup_mysql.cc b/extra/mariabackup/backup_mysql.cc
index 843ebf2663e..d5d0c90376e 100644
--- a/extra/mariabackup/backup_mysql.cc
+++ b/extra/mariabackup/backup_mysql.cc
@@ -326,194 +326,212 @@ check_server_version(unsigned long version_number,
 /*********************************************************************//**
 Receive options important for XtraBackup from MySQL server.
 @return	true on success. */
-bool
-get_mysql_vars(MYSQL *connection)
+bool get_mysql_vars(MYSQL *connection)
 {
-	char *gtid_mode_var = NULL;
-	char *version_var = NULL;
-	char *version_comment_var = NULL;
-	char *innodb_version_var = NULL;
-	char *have_backup_locks_var = NULL;
-	char *log_bin_var = NULL;
-	char *lock_wait_timeout_var= NULL;
-	char *wsrep_on_var = NULL;
-	char *slave_parallel_workers_var = NULL;
-	char *gtid_slave_pos_var = NULL;
-	char *innodb_buffer_pool_filename_var = NULL;
-	char *datadir_var = NULL;
-	char *innodb_log_group_home_dir_var = NULL;
-	char *innodb_log_file_size_var = NULL;
-	char *innodb_log_files_in_group_var = NULL;
-	char *innodb_data_file_path_var = NULL;
-	char *innodb_data_home_dir_var = NULL;
-	char *innodb_undo_directory_var = NULL;
-	char *innodb_page_size_var = NULL;
-	char *innodb_undo_tablespaces_var = NULL;
-	char *page_zip_level_var = NULL;
-	char *endptr;
-	unsigned long server_version = mysql_get_server_version(connection);
-
-	bool ret = true;
-
-	mysql_variable mysql_vars[] = {
-		{"have_backup_locks", &have_backup_locks_var},
-		{"log_bin", &log_bin_var},
-		{"lock_wait_timeout", &lock_wait_timeout_var},
-		{"gtid_mode", &gtid_mode_var},
-		{"version", &version_var},
-		{"version_comment", &version_comment_var},
-		{"innodb_version", &innodb_version_var},
-		{"wsrep_on", &wsrep_on_var},
-		{"slave_parallel_workers", &slave_parallel_workers_var},
-		{"gtid_slave_pos", &gtid_slave_pos_var},
-		{"innodb_buffer_pool_filename",
-			&innodb_buffer_pool_filename_var},
-		{"datadir", &datadir_var},
-		{"innodb_log_group_home_dir", &innodb_log_group_home_dir_var},
-		{"innodb_log_file_size", &innodb_log_file_size_var},
-		{"innodb_log_files_in_group", &innodb_log_files_in_group_var},
-		{"innodb_data_file_path", &innodb_data_file_path_var},
-		{"innodb_data_home_dir", &innodb_data_home_dir_var},
-		{"innodb_undo_directory", &innodb_undo_directory_var},
-		{"innodb_page_size", &innodb_page_size_var},
-		{"innodb_undo_tablespaces", &innodb_undo_tablespaces_var},
-		{"innodb_compression_level", &page_zip_level_var},
-		{NULL, NULL}
-	};
-
-	read_mysql_variables(connection, "SHOW VARIABLES",
-				mysql_vars, true);
+  char *gtid_mode_var= NULL;
+  char *version_var= NULL;
+  char *version_comment_var= NULL;
+  char *innodb_version_var= NULL;
+  char *have_backup_locks_var= NULL;
+  char *log_bin_var= NULL;
+  char *lock_wait_timeout_var= NULL;
+  char *wsrep_on_var= NULL;
+  char *slave_parallel_workers_var= NULL;
+  char *gtid_slave_pos_var= NULL;
+  char *innodb_buffer_pool_filename_var= NULL;
+  char *datadir_var= NULL;
+  char *innodb_log_group_home_dir_var= NULL;
+  char *innodb_log_file_size_var= NULL;
+  char *innodb_log_files_in_group_var= NULL;
+  char *innodb_data_file_path_var= NULL;
+  char *innodb_data_home_dir_var= NULL;
+  char *innodb_undo_directory_var= NULL;
+  char *innodb_page_size_var= NULL;
+  char *innodb_undo_tablespaces_var= NULL;
+  char *page_zip_level_var= NULL;
+  char *ignore_db_dirs= NULL;
+  char *endptr;
+  unsigned long server_version= mysql_get_server_version(connection);
+
+  bool ret= true;
+
+  mysql_variable mysql_vars[]= {
+      {"have_backup_locks", &have_backup_locks_var},
+      {"log_bin", &log_bin_var},
+      {"lock_wait_timeout", &lock_wait_timeout_var},
+      {"gtid_mode", &gtid_mode_var},
+      {"version", &version_var},
+      {"version_comment", &version_comment_var},
+      {"innodb_version", &innodb_version_var},
+      {"wsrep_on", &wsrep_on_var},
+      {"slave_parallel_workers", &slave_parallel_workers_var},
+      {"gtid_slave_pos", &gtid_slave_pos_var},
+      {"innodb_buffer_pool_filename", &innodb_buffer_pool_filename_var},
+      {"datadir", &datadir_var},
+      {"innodb_log_group_home_dir", &innodb_log_group_home_dir_var},
+      {"innodb_log_file_size", &innodb_log_file_size_var},
+      {"innodb_log_files_in_group", &innodb_log_files_in_group_var},
+      {"innodb_data_file_path", &innodb_data_file_path_var},
+      {"innodb_data_home_dir", &innodb_data_home_dir_var},
+      {"innodb_undo_directory", &innodb_undo_directory_var},
+      {"innodb_page_size", &innodb_page_size_var},
+      {"innodb_undo_tablespaces", &innodb_undo_tablespaces_var},
+      {"innodb_compression_level", &page_zip_level_var},
+      {"ignore_db_dirs", &ignore_db_dirs},
+      {NULL, NULL}};
+
+  read_mysql_variables(connection, "SHOW VARIABLES", mysql_vars, true);
+
+  if (have_backup_locks_var != NULL && !opt_no_backup_locks)
+  {
+    have_backup_locks= true;
+  }
 
-	if (have_backup_locks_var != NULL && !opt_no_backup_locks) {
-		have_backup_locks = true;
-	}
+  if (opt_binlog_info == BINLOG_INFO_AUTO)
+  {
+    if (log_bin_var != NULL && !strcmp(log_bin_var, "ON"))
+      opt_binlog_info= BINLOG_INFO_ON;
+    else
+      opt_binlog_info= BINLOG_INFO_OFF;
+  }
 
-	if (opt_binlog_info == BINLOG_INFO_AUTO) {
-		if (log_bin_var != NULL && !strcmp(log_bin_var, "ON"))
-			opt_binlog_info = BINLOG_INFO_ON;
-		else
-			opt_binlog_info = BINLOG_INFO_OFF;
-	}
+  if (lock_wait_timeout_var != NULL)
+  {
+    have_lock_wait_timeout= true;
+  }
 
-	if (lock_wait_timeout_var != NULL) {
-		have_lock_wait_timeout = true;
-	}
+  if (wsrep_on_var != NULL)
+  {
+    have_galera_enabled= true;
+  }
 
-	if (wsrep_on_var != NULL) {
-		have_galera_enabled = true;
-	}
+  /* Check server version compatibility and detect server flavor */
 
-	/* Check server version compatibility and detect server flavor */
+  if (!(ret= check_server_version(server_version, version_var,
+                                  version_comment_var, innodb_version_var)))
+  {
+    goto out;
+  }
 
-	if (!(ret = check_server_version(server_version, version_var,
-					 version_comment_var,
-					 innodb_version_var))) {
-		goto out;
-	}
+  if (server_version > 50500)
+  {
+    have_flush_engine_logs= true;
+  }
 
-	if (server_version > 50500) {
-		have_flush_engine_logs = true;
-	}
+  if (slave_parallel_workers_var != NULL &&
+      atoi(slave_parallel_workers_var) > 0)
+  {
+    have_multi_threaded_slave= true;
+  }
 
-	if (slave_parallel_workers_var != NULL
-		&& atoi(slave_parallel_workers_var) > 0) {
-		have_multi_threaded_slave = true;
-	}
+  if (innodb_buffer_pool_filename_var != NULL)
+  {
+    buffer_pool_filename= strdup(innodb_buffer_pool_filename_var);
+  }
 
-	if (innodb_buffer_pool_filename_var != NULL) {
-		buffer_pool_filename = strdup(innodb_buffer_pool_filename_var);
-	}
+  if ((gtid_mode_var && strcmp(gtid_mode_var, "ON") == 0) ||
+      (gtid_slave_pos_var && *gtid_slave_pos_var))
+  {
+    have_gtid_slave= true;
+  }
 
-	if ((gtid_mode_var && strcmp(gtid_mode_var, "ON") == 0) ||
-	    (gtid_slave_pos_var && *gtid_slave_pos_var)) {
-		have_gtid_slave = true;
-	}
+  msg("Using server version %s", version_var);
 
-	msg("Using server version %s", version_var);
+  if (!(ret= detect_mysql_capabilities_for_backup()))
+  {
+    goto out;
+  }
 
-	if (!(ret = detect_mysql_capabilities_for_backup())) {
-		goto out;
-	}
+  /* make sure datadir value is the same in configuration file */
+  if (check_if_param_set("datadir"))
+  {
+    if (!directory_exists(mysql_data_home, false))
+    {
+      msg("Warning: option 'datadir' points to "
+          "nonexistent directory '%s'",
+          mysql_data_home);
+    }
+    if (!directory_exists(datadir_var, false))
+    {
+      msg("Warning: MySQL variable 'datadir' points to "
+          "nonexistent directory '%s'",
+          datadir_var);
+    }
+    if (!equal_paths(mysql_data_home, datadir_var))
+    {
+      msg("Warning: option 'datadir' has different "
+          "values:\n"
+          "  '%s' in defaults file\n"
+          "  '%s' in SHOW VARIABLES",
+          mysql_data_home, datadir_var);
+    }
+  }
 
-	/* make sure datadir value is the same in configuration file */
-	if (check_if_param_set("datadir")) {
-		if (!directory_exists(mysql_data_home, false)) {
-			msg("Warning: option 'datadir' points to "
-			    "nonexistent directory '%s'", mysql_data_home);
-		}
-		if (!directory_exists(datadir_var, false)) {
-			msg("Warning: MySQL variable 'datadir' points to "
-			    "nonexistent directory '%s'", datadir_var);
-		}
-		if (!equal_paths(mysql_data_home, datadir_var)) {
-			msg("Warning: option 'datadir' has different "
-				"values:\n"
-				"  '%s' in defaults file\n"
-				"  '%s' in SHOW VARIABLES",
-				mysql_data_home, datadir_var);
-		}
-	}
+  /* get some default values is they are missing from my.cnf */
+  if (datadir_var && *datadir_var)
+  {
+    strmake(mysql_real_data_home, datadir_var, FN_REFLEN - 1);
+    mysql_data_home= mysql_real_data_home;
+  }
 
-	/* get some default values is they are missing from my.cnf */
-	if (datadir_var && *datadir_var) {
-		strmake(mysql_real_data_home, datadir_var, FN_REFLEN - 1);
-		mysql_data_home= mysql_real_data_home;
-	}
+  if (innodb_data_file_path_var && *innodb_data_file_path_var)
+  {
+    innobase_data_file_path= my_strdup(innodb_data_file_path_var, MYF(MY_FAE));
+  }
 
-	if (innodb_data_file_path_var && *innodb_data_file_path_var) {
-		innobase_data_file_path = my_strdup(
-			innodb_data_file_path_var, MYF(MY_FAE));
-	}
+  if (innodb_data_home_dir_var)
+  {
+    innobase_data_home_dir= my_strdup(innodb_data_home_dir_var, MYF(MY_FAE));
+  }
 
-	if (innodb_data_home_dir_var) {
-		innobase_data_home_dir = my_strdup(
-			innodb_data_home_dir_var, MYF(MY_FAE));
-	}
+  if (innodb_log_group_home_dir_var && *innodb_log_group_home_dir_var)
+  {
+    srv_log_group_home_dir=
+        my_strdup(innodb_log_group_home_dir_var, MYF(MY_FAE));
+  }
 
-	if (innodb_log_group_home_dir_var
-	    && *innodb_log_group_home_dir_var) {
-		srv_log_group_home_dir = my_strdup(
-			innodb_log_group_home_dir_var, MYF(MY_FAE));
-	}
+  if (innodb_undo_directory_var && *innodb_undo_directory_var)
+  {
+    srv_undo_dir= my_strdup(innodb_undo_directory_var, MYF(MY_FAE));
+  }
 
-	if (innodb_undo_directory_var && *innodb_undo_directory_var) {
-		srv_undo_dir = my_strdup(
-			innodb_undo_directory_var, MYF(MY_FAE));
-	}
+  if (innodb_log_files_in_group_var)
+  {
+    srv_n_log_files= strtol(innodb_log_files_in_group_var, &endptr, 10);
+    ut_ad(*endptr == 0);
+  }
 
-	if (innodb_log_files_in_group_var) {
-		srv_n_log_files = strtol(
-			innodb_log_files_in_group_var, &endptr, 10);
-		ut_ad(*endptr == 0);
-	}
+  if (innodb_log_file_size_var)
+  {
+    srv_log_file_size= strtoll(innodb_log_file_size_var, &endptr, 10);
+    ut_ad(*endptr == 0);
+  }
 
-	if (innodb_log_file_size_var) {
-		srv_log_file_size = strtoll(
-			innodb_log_file_size_var, &endptr, 10);
-		ut_ad(*endptr == 0);
-	}
+  if (innodb_page_size_var)
+  {
+    innobase_page_size= strtoll(innodb_page_size_var, &endptr, 10);
+    ut_ad(*endptr == 0);
+  }
 
-	if (innodb_page_size_var) {
-		innobase_page_size = strtoll(
-			innodb_page_size_var, &endptr, 10);
-		ut_ad(*endptr == 0);
-	}
+  if (innodb_undo_tablespaces_var)
+  {
+    srv_undo_tablespaces= strtoul(innodb_undo_tablespaces_var, &endptr, 10);
+    ut_ad(*endptr == 0);
+  }
 
-	if (innodb_undo_tablespaces_var) {
-		srv_undo_tablespaces = strtoul(innodb_undo_tablespaces_var,
-					       &endptr, 10);
-		ut_ad(*endptr == 0);
-	}
+  if (page_zip_level_var != NULL)
+  {
+    page_zip_level= strtoul(page_zip_level_var, &endptr, 10);
+    ut_ad(*endptr == 0);
+  }
 
-	if (page_zip_level_var != NULL) {
-		page_zip_level = strtoul(page_zip_level_var, &endptr, 10);
-		ut_ad(*endptr == 0);
-	}
+  if (ignore_db_dirs)
+    xb_load_list_string(ignore_db_dirs, ",", register_ignore_db_dirs_filter);
 
 out:
-	free_mysql_variables(mysql_vars);
+  free_mysql_variables(mysql_vars);
 
-	return(ret);
+  return (ret);
 }
 
 /*********************************************************************//**
diff --git a/extra/mariabackup/xtrabackup.cc b/extra/mariabackup/xtrabackup.cc
index d11f7295f8e..040fbeb8f32 100644
--- a/extra/mariabackup/xtrabackup.cc
+++ b/extra/mariabackup/xtrabackup.cc
@@ -3632,6 +3632,11 @@ xb_register_exclude_filter_entry(
 				 &tables_exclude_hash);
 }
 
+void register_ignore_db_dirs_filter(const char *name)
+{
+  xb_add_filter(name, &databases_exclude_hash);
+}
+
 /***********************************************************************
 Register new table for the filter.  */
 static
@@ -3694,26 +3699,24 @@ xb_register_exclude_regex(
 
 typedef void (*insert_entry_func_t)(const char*);
 
-/***********************************************************************
-Scan string and load filter entries from it.  */
-static
-void
-xb_load_list_string(
-/*================*/
-	char* list,			/*!< in: string representing a list */
-	const char* delimiters,		/*!< in: delimiters of entries */
-	insert_entry_func_t ins)	/*!< in: callback to add entry */
+/* Scan string and load filter entries from it.
+@param[in] list string representing a list
+@param[in] delimiters delimiters of entries
+@param[in] ins callback to add entry */
+void xb_load_list_string(char *list, const char *delimiters,
+                         insert_entry_func_t ins)
 {
-	char*	p;
-	char*	saveptr;
+  char *p;
+  char *saveptr;
 
-	p = strtok_r(list, delimiters, &saveptr);
-	while (p) {
+  p= strtok_r(list, delimiters, &saveptr);
+  while (p)
+  {
 
-		ins(p);
+    ins(p);
 
-		p = strtok_r(NULL, delimiters, &saveptr);
-	}
+    p= strtok_r(NULL, delimiters, &saveptr);
+  }
 }
 
 /***********************************************************************
diff --git a/extra/mariabackup/xtrabackup.h b/extra/mariabackup/xtrabackup.h
index c56e83f7a32..2dbdd442f95 100644
--- a/extra/mariabackup/xtrabackup.h
+++ b/extra/mariabackup/xtrabackup.h
@@ -194,4 +194,14 @@ void mdl_lock_init();
 void mdl_lock_table(ulint space_id);
 void mdl_unlock_all();
 bool ends_with(const char *str, const char *suffix);
+
+typedef void (*insert_entry_func_t)(const char*);
+
+/* Scan string and load filter entries from it.
+@param[in] list string representing a list
+@param[in] delimiters delimiters of entries
+@param[in] ins callback to add entry */
+void xb_load_list_string(char *list, const char *delimiters,
+                         insert_entry_func_t ins);
+void register_ignore_db_dirs_filter(const char *name);
 #endif /* XB_XTRABACKUP_H */