Add support for mariadb server config parameter

mariadb/CHANGELOG.md

@@ -1,5 +1,9 @@
 # Changelog
 
+## 2.7.2
+
+- Add option to configure MariaDB server parameters (see also [home-assistant/addons#3754](https://github.com/home-assistant/addons/issues/3754))
+
 ## 2.7.1
 
 **Note:** Restart the add-on before upgrade if the current version is lower

mariadb/DOCS.md

@@ -74,6 +74,13 @@ If omitted, grants `ALL PRIVILEGES` to the user. Restricting privileges of the u
 that Home Assistant uses is not recommended but if you want to allow other applications
 to view recorder data should create a user limited to read-only access on the database.
 
+### Option: `mariadb_server_args` (optional)
+
+Some users have experienced [errors][migration-issues] during Home Assistant schema updates on large databases.
+Defining the recommended parameters can help if there is RAM available.
+
+Example: `--innodb_buffer_pool_size=512M`
+
 ## Home Assistant Configuration
 
 MariaDB will be used by the `recorder` and `history` components within Home Assistant. For more information about setting this up, see the [recorder integration][mariadb-ha-recorder] documentation for Home Assistant.
@@ -101,6 +108,7 @@ In case you've found a bug, please [open an issue on our GitHub][issue].
 [username]: https://mariadb.com/kb/en/create-user/#user-name-component
 [hostname]: https://mariadb.com/kb/en/create-user/#host-name-component
 [grant]: https://mariadb.com/kb/en/grant/
+[migration-issues]: https://github.com/home-assistant/core/issues/125339
 [mariadb-ha-recorder]: https://www.home-assistant.io/integrations/recorder/
 [discord]: https://discord.gg/c5DvZ4e
 [forum]: https://community.home-assistant.io

mariadb/config.yaml

@@ -1,5 +1,5 @@
 ---
-version: 2.7.1
+version: 2.7.2
 slug: mariadb
 name: MariaDB
 description: A SQL database server
@@ -38,6 +38,8 @@ schema:
           CREATE VIEW|DELETE|DELETE HISTORY|DROP|EVENT|GRANT OPTION|INDEX|\
           INSERT|LOCK TABLES|SELECT|SHOW VIEW|TRIGGER|UPDATE)?"
       username: str
+  mariadb_server_args:
+    - str?
 services:
   - mysql:provide
 startup: system

mariadb/rootfs/etc/s6-overlay/s6-rc.d/mariadb-core/run

@@ -4,7 +4,13 @@
 # Start MariaDB service
 # ==============================================================================
 
+if bashio::config.has_value "mariadb_server_args"; then
+  extra_args+=($(bashio::config 'mariadb_server_args'))
+  bashio::log.info "Starting MariaDB with command line parameters: ${extra_args[@]}"
+else
+  bashio::log.info "Starting MariaDB"
+fi
+
 # Start mariadb
-bashio::log.info "Starting MariaDB"
 mkdir -p /run/mysqld
-exec mysqld --datadir="${MARIADB_DATA}" --user=root < /dev/null
+exec mysqld --datadir="${MARIADB_DATA}" --user=root "${extra_args[@]}" < /dev/null