[#MDEV-19807] MariaDB client plugin path is wrong

When connecting using ed25519, the client has the default plugin path wrong. If using a specific plugin path, in the config file or on the command line, it works, even if this is set in to the same value as the default.
Extract from /etc/my.cnf.d/server.cnf

[mysqld]

plugin_load_add = auth_ed25519

Create and grant access to a user:

create user root2@'192.168.142.210' IDENTIFIED VIA ed25519 USING PASSWORD('root2');

grant all on *.* to  root2@'192.168.142.210';

Connect to MariaDB using ed25519 authentification:

$ mysql -u root2 -proot2 -h 192.168.142.210

ERROR 1045 (28000): Plugin client_ed25519 could not be loaded: /usr//usr/lib64/mysql/plugin/client_ed25519.so: cannot open shared object file: No such file or directory

Note the path to the plugin, there is an extra leading "/usr" there. Setting the path to the correct one works fine:

$ mysql -u root2 -proot2 -h 192.168.142.210 --plugin-dir=/usr/lib64/mysql/plugin

Welcome to the MariaDB monitor.  Commands end with ; or \g.

Your MariaDB connection id is 21

Server version: 10.4.6-MariaDB MariaDB Server

Copyright (c) 2000, 2018, Oracle, MariaDB Corporation Ab and others.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

MariaDB [(none)]>

The above also work when setting the correct path in /etc/my.cnf.c/client.cnf or some other appropriate config file.

[MDEV-19807] MariaDB client plugin path is wrong Created: 2019-06-19 Updated: 2019-09-24 Resolved: 2019-06-20
Status:	Closed
Project:	MariaDB Server
Component/s:	Plugins
Affects Version/s:	10.4.6
Fix Version/s:	10.2.26, 10.3.17, 10.4.7

[MDEV-19807] MariaDB client plugin path is wrong Created: 2019-06-19 Updated: 2019-09-24 Resolved: 2019-06-20