MDEV-19933: Sync mariadb-common and update-alternatives based /etc/my…

…sql/

Split the big my.cnf into multiple smaller files with the same filenames
and contents as official Debian/Ubuntu packaging has.

The config contents stays the same apart from following additions
which the original MariaDB upstream configs had and probably needs
to be kept:
- lc-messages=en_US and skip-external-locking in server config

Configs the original MariaDB upstream had that are seemingly
unnecessary and thus removed:
- port=3306 removed from the client config
- log_warnings=2 removed from server config

Also adopt update-alternatives system using
mysql-common/configure-symlinks. This way it is aligned with
downstream Debian/Ubuntu packaging.

debian/additions/mariadb.cnf

@@ -1,19 +1,23 @@
-# MariaDB-specific config file.
-# Read by /etc/mysql/my.cnf
-
-[client]
-# Default is Latin1, if you need UTF-8 set this (also in server section)
-#default-character-set = utf8 
+# The MariaDB configuration file
+#
+# The MariaDB/MySQL tools read configuration files in the following order:
+# 1. "/etc/mysql/mariadb.cnf" (this file) to set global defaults,
+# 2. "/etc/mysql/conf.d/*.cnf" to set global options.
+# 3. "/etc/mysql/mariadb.conf.d/*.cnf" to set MariaDB-only options.
+# 4. "~/.my.cnf" to set user-specific options.
+#
+# If the same option is defined multiple times, the last one will apply.
+#
+# One can use all long options that the program supports.
+# Run program with --help to get a list of available options and with
+# --print-defaults to see which it would actually understand and use.
 
-[mysqld]
 #
-# * Character sets
-# 
-# Default is Latin1, if you need UTF-8 set all this (also in client section)
+# This group is read both by the client and the server
+# use it for options that affect everything
 #
-#character-set-server  = utf8 
-#collation-server      = utf8_general_ci 
-#character_set_server   = utf8 
-#collation_server       = utf8_general_ci 
+[client-server]
+
 # Import all .cnf files from configuration directory
+!includedir /etc/mysql/conf.d/
 !includedir /etc/mysql/mariadb.conf.d/

debian/additions/mariadb.conf.d/50-client.cnf

@@ -0,0 +1,25 @@
+#
+# This group is read by the client library
+# Use it for options that affect all clients, but not the server
+#
+
+[client]
+# Default is Latin1, if you need UTF-8 set this (also in server section)
+default-character-set = utf8mb4
+
+# socket location
+socket = /var/run/mysqld/mysqld.sock
+
+# Example of client certificate usage
+# ssl-cert=/etc/mysql/client-cert.pem
+# ssl-key=/etc/mysql/client-key.pem
+#
+# Allow only TLS encrypted connections
+# ssl-verify-server-cert=on
+
+# This group is *never* read by mysql client library, though this
+# /etc/mysql/mariadb.cnf.d/client.cnf file is not read by Oracle MySQL
+# client anyway.
+# If you use the same .cnf file for MySQL and MariaDB,
+# use it for MariaDB-only client options
+[client-mariadb]

debian/additions/mariadb.conf.d/50-mysql-clients.cnf

@@ -0,0 +1,24 @@
+#
+# These groups are read by MariaDB command-line tools
+# Use it for options that affect only one utility
+#
+
+[mysql]
+# Default is Latin1, if you need UTF-8 set this (also in server section)
+default-character-set = utf8mb4
+
+[mysql_upgrade]
+
+[mysqladmin]
+
+[mysqlbinlog]
+
+[mysqlcheck]
+
+[mysqldump]
+
+[mysqlimport]
+
+[mysqlshow]
+
+[mysqlslap]

debian/additions/mariadb.conf.d/50-mysqld_safe.cnf

@@ -0,0 +1,30 @@
+# NOTE: This file is read only by the traditional SysV init script, not systemd.
+# MariaDB systemd does _not_ utilize mysqld_safe nor read this file.
+#
+# For similar behaviour, systemd users should create the following file:
+# /etc/systemd/system/mariadb.service.d/migrated-from-my.cnf-settings.conf
+#
+# To achieve the same result as the default 50-mysqld_safe.cnf, please create
+# /etc/systemd/system/mariadb.service.d/migrated-from-my.cnf-settings.conf
+# with the following contents:
+#
+# [Service]
+# User=mysql
+# StandardOutput=syslog
+# StandardError=syslog
+# SyslogFacility=daemon
+# SyslogLevel=err
+# SyslogIdentifier=mysqld
+#
+# For more information, please read https://mariadb.com/kb/en/mariadb/systemd/
+#
+
+[mysqld_safe]
+# This will be passed to all mysql clients
+# It has been reported that passwords should be enclosed with ticks/quotes
+# especially if they contain "#" chars...
+# Remember to edit /etc/mysql/debian.cnf when changing the socket location.
+socket		= /var/run/mysqld/mysqld.sock
+nice		= 0
+skip_log_error
+syslog

debian/additions/mariadb.conf.d/50-server.cnf

@@ -0,0 +1,133 @@
+#
+# These groups are read by MariaDB server.
+# Use it for options that only the server (but not clients) should see
+#
+# See the examples of server my.cnf files in /usr/share/mysql
+
+# this is read by the standalone daemon and embedded servers
+[server]
+
+# this is only for the mysqld standalone daemon
+[mysqld]
+
+#
+# * Basic Settings
+#
+user                    = mysql
+pid-file                = /run/mysqld/mysqld.pid
+socket                  = /run/mysqld/mysqld.sock
+#port                   = 3306
+basedir                 = /usr
+datadir                 = /var/lib/mysql
+tmpdir                  = /tmp
+lc-messages-dir         = /usr/share/mysql
+#skip-external-locking
+
+# Instead of skip-networking the default is now to listen only on
+# localhost which is more compatible and is not less secure.
+bind-address            = 127.0.0.1
+
+#
+# * Fine Tuning
+#
+#key_buffer_size        = 16M
+#max_allowed_packet     = 16M
+#thread_stack           = 192K
+#thread_cache_size      = 8
+# This replaces the startup script and checks MyISAM tables if needed
+# the first time they are touched
+#myisam_recover_options = BACKUP
+#max_connections        = 100
+#table_cache            = 64
+#thread_concurrency     = 10
+
+#
+# * Query Cache Configuration
+#
+#query_cache_limit      = 1M
+query_cache_size        = 16M
+
+#
+# * Logging and Replication
+#
+# Both location gets rotated by the cronjob.
+# Be aware that this log type is a performance killer.
+# As of 5.1 you can enable the log at runtime!
+#general_log_file       = /var/log/mysql/mysql.log
+#general_log            = 1
+#
+# Error log - should be very few entries.
+#
+log_error = /var/log/mysql/error.log
+#
+# Enable the slow query log to see queries with especially long duration
+#slow_query_log_file    = /var/log/mysql/mariadb-slow.log
+#long_query_time        = 10
+#log_slow_rate_limit    = 1000
+#log_slow_verbosity     = query_plan
+#log-queries-not-using-indexes
+#
+# The following can be used as easy to replay backup logs or for replication.
+# note: if you are setting up a replication slave, see README.Debian about
+#       other settings you may need to change.
+#server-id              = 1
+#log_bin                = /var/log/mysql/mysql-bin.log
+expire_logs_days        = 10
+#max_binlog_size        = 100M
+#binlog_do_db           = include_database_name
+#binlog_ignore_db       = exclude_database_name
+
+#
+# * Security Features
+#
+# Read the manual, too, if you want chroot!
+#chroot = /var/lib/mysql/
+#
+# For generating SSL certificates you can use for example the GUI tool "tinyca".
+#
+#ssl-ca = /etc/mysql/cacert.pem
+#ssl-cert = /etc/mysql/server-cert.pem
+#ssl-key = /etc/mysql/server-key.pem
+#
+# Accept only connections using the latest and most secure TLS protocol version.
+# ..when MariaDB is compiled with OpenSSL:
+#ssl-cipher = TLSv1.2
+# ..when MariaDB is compiled with YaSSL (default in Debian):
+#ssl = on
+
+#
+# * Character sets
+#
+# MySQL/MariaDB default is Latin1, but in Debian we rather default to the full
+# utf8 4-byte character set. See also client.cnf
+#
+character-set-server  = utf8mb4
+collation-server      = utf8mb4_general_ci
+
+#
+# * InnoDB
+#
+# InnoDB is enabled by default with a 10MB datafile in /var/lib/mysql/.
+# Read the manual for more InnoDB related options. There are many!
+
+#
+# * Unix socket authentication plugin is built-in since 10.0.22-6
+#
+# Needed so the root database user can authenticate without a password but
+# only when running as the unix root user.
+#
+# Also available for other users if required.
+# See https://mariadb.com/kb/en/unix_socket-authentication-plugin/
+
+# this is only for embedded server
+[embedded]
+
+# This group is only read by MariaDB servers, not by MySQL.
+# If you use the same .cnf file for MySQL and MariaDB,
+# you can put MariaDB-only options here
+[mariadb]
+
+# This group is only read by MariaDB-10.5 servers.
+# If you use the same .cnf file for MariaDB of different versions,
+# use this group for options that older servers don't understand
+[mariadb-10.5]

debian/additions/mariadb.conf.d/60-galera.cnf

@@ -0,0 +1,19 @@
+#
+# * Galera-related settings
+#
+[galera]
+# Mandatory settings
+#wsrep_on=ON
+#wsrep_provider=
+#wsrep_cluster_address=
+#binlog_format=row
+#default_storage_engine=InnoDB
+#innodb_autoinc_lock_mode=2
+#
+# Allow server to accept connections on all interfaces.
+#
+#bind-address=0.0.0.0
+#
+# Optional setting
+#wsrep_slave_threads=1
+#innodb_flush_log_at_trx_commit=0