MDEV-13608 : set client plugin directory with mysql_options()

if plugin_dir is specified. Also, allow to specify protocol (e.g pipe)

extra/mariabackup/backup_mysql.cc

@@ -112,6 +112,11 @@ xb_mysql_connect()
 			      (char *) &opt_secure_auth);
 	}
 
+	if (xb_plugin_dir && *xb_plugin_dir){
+		mysql_options(connection, MYSQL_PLUGIN_DIR, xb_plugin_dir);
+	}
+	mysql_options(connection, MYSQL_OPT_PROTOCOL, &opt_protocol);
+
 	msg_ts("Connecting to MySQL server host: %s, user: %s, password: %s, "
 	       "port: %s, socket: %s\n", opt_host ? opt_host : "localhost",
 	       opt_user ? opt_user : "not set",

extra/mariabackup/xtrabackup.cc

@@ -123,6 +123,7 @@ my_bool xtrabackup_apply_log_only = FALSE;
 longlong xtrabackup_use_memory = 100*1024*1024L;
 my_bool xtrabackup_create_ib_logfile = FALSE;
 
+uint opt_protocol;
 long xtrabackup_throttle = 0; /* 0:unlimited */
 lint io_ticket;
 os_event_t wait_throttle = NULL;
@@ -560,6 +561,7 @@ enum options_xtrabackup
 
   OPT_XTRA_TABLES_EXCLUDE,
   OPT_XTRA_DATABASES_EXCLUDE,
+  OPT_PROTOCOL
 };
 
 struct my_option xb_client_options[] =
@@ -799,6 +801,9 @@ struct my_option xb_client_options[] =
    0, 0, 0, GET_STR,
    REQUIRED_ARG, 0, 0, 0, 0, 0, 0},
 
+  {"protocol", OPT_PROTOCOL, "The protocol to use for connection (tcp, socket, pipe, memory).",
+   0, 0, 0, GET_STR, REQUIRED_ARG, 0, 0, 0, 0, 0, 0},
+
   {"socket", 'S', "This option specifies the socket to use when "
    "connecting to the local database server with a UNIX domain socket.  "
    "The option accepts a string argument. See mysql --help for details.",
@@ -1364,8 +1369,13 @@ xb_get_one_option(int optid,
         start[1]=0 ;
     }
     break;
-
-
+  case OPT_PROTOCOL:
+    if (argument)
+    {
+       opt_protocol= find_type_or_exit(argument, &sql_protocol_typelib,
+                                    opt->name);
+    }
+    break;
 #include "sslopt-case.h"
 
   case '?':

extra/mariabackup/xtrabackup.h

@@ -55,6 +55,8 @@ extern char		*xtrabackup_incremental_dir;
 extern char		*xtrabackup_incremental_basedir;
 extern char		*innobase_data_home_dir;
 extern char		*innobase_buffer_pool_filename;
+extern char		*xb_plugin_dir;
+extern uint		opt_protocol;
 extern ds_ctxt_t	*ds_meta;
 extern ds_ctxt_t	*ds_data;
 

mysql-test/suite/mariabackup/auth_plugin_win.opt

+--enable-named-pipe

mysql-test/suite/mariabackup/auth_plugin_win.result

+INSTALL SONAME 'auth_named_pipe';
+CREATE USER 'USERNAME' IDENTIFIED WITH named_pipe;
+GRANT ALL PRIVILEGES ON *.* to USERNAME;
+DROP USER 'USERNAME';
+UNINSTALL SONAME 'auth_named_pipe';

mysql-test/suite/mariabackup/auth_plugin_win.test

+--source include/windows.inc
+--source include/not_embedded.inc
+
+if (!$AUTH_NAMED_PIPE_SO) {
+  skip No named pipe plugin;
+}
+
+if (!$USERNAME) {
+  skip USERNAME variable is undefined;
+}
+
+if (`SELECT count(*) <> 0 FROM mysql.user WHERE user = '$USERNAME'`) {
+  skip \$USER=$USER which exists in mysql.user;
+}
+
+INSTALL SONAME 'auth_named_pipe';
+
+--replace_result $USERNAME USERNAME
+eval CREATE USER '$USERNAME' IDENTIFIED WITH named_pipe;
+--replace_result $USERNAME USERNAME
+eval GRANT ALL PRIVILEGES ON *.* to $USERNAME;
+
+let $targetdir=$MYSQLTEST_VARDIR/tmp/backup;
+--disable_result_log
+exec $XTRABACKUP --defaults-file=$MYSQLTEST_VARDIR/my.cnf -u $USERNAME --backup --protocol=pipe --target-dir=$targetdir;
+--enable_result_log
+--replace_result $USERNAME USERNAME
+eval DROP USER '$USERNAME';
+rmdir $targetdir;
+UNINSTALL SONAME 'auth_named_pipe';
+