432 lines
15 KiB
Nix
432 lines
15 KiB
Nix
{ config, lib, pkgs, ... }:
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with lib;
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let
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cfg = config.services.mysql;
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mysql = cfg.package;
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isMariaDB =
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let
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pName = _p: (builtins.parseDrvName (_p.name)).name;
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in pName mysql == pName pkgs.mariadb;
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isMysqlAtLeast57 =
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let
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pName = _p: (builtins.parseDrvName (_p.name)).name;
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in (pName mysql == pName pkgs.mysql57)
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&& ((builtins.compareVersions mysql.version "5.7") >= 0);
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mysqldOptions =
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"--user=${cfg.user} --datadir=${cfg.dataDir} --basedir=${mysql}";
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# For MySQL 5.7+, --insecure creates the root user without password
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# (earlier versions and MariaDB do this by default).
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installOptions =
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"${mysqldOptions} ${lib.optionalString isMysqlAtLeast57 "--insecure"}";
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in
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{
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###### interface
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options = {
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services.mysql = {
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enable = mkOption {
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type = types.bool;
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default = false;
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description = "
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Whether to enable the MySQL server.
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";
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};
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package = mkOption {
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type = types.package;
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example = literalExample "pkgs.mysql";
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description = "
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Which MySQL derivation to use. MariaDB packages are supported too.
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";
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};
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bind = mkOption {
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type = types.nullOr types.str;
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default = null;
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example = literalExample "0.0.0.0";
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description = "Address to bind to. The default is to bind to all addresses";
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};
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port = mkOption {
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type = types.int;
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default = 3306;
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description = "Port of MySQL";
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};
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user = mkOption {
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type = types.str;
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default = "mysql";
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description = "User account under which MySQL runs";
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};
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dataDir = mkOption {
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type = types.path;
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example = "/var/lib/mysql";
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description = "Location where MySQL stores its table files";
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};
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extraOptions = mkOption {
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type = types.lines;
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default = "";
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example = ''
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key_buffer_size = 6G
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table_cache = 1600
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log-error = /var/log/mysql_err.log
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'';
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description = ''
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Provide extra options to the MySQL configuration file.
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Please note, that these options are added to the
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<literal>[mysqld]</literal> section so you don't need to explicitly
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state it again.
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'';
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};
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initialDatabases = mkOption {
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type = types.listOf (types.submodule {
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options = {
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name = mkOption {
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type = types.str;
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description = ''
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The name of the database to create.
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'';
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};
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schema = mkOption {
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type = types.nullOr types.path;
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default = null;
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description = ''
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The initial schema of the database; if null (the default),
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an empty database is created.
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'';
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};
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};
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});
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default = [];
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description = ''
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List of database names and their initial schemas that should be used to create databases on the first startup
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of MySQL. The schema attribute is optional: If not specified, an empty database is created.
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'';
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example = [
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{ name = "foodatabase"; schema = literalExample "./foodatabase.sql"; }
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{ name = "bardatabase"; }
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];
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};
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initialScript = mkOption {
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type = types.nullOr types.path;
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default = null;
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description = "A file containing SQL statements to be executed on the first startup. Can be used for granting certain permissions on the database";
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};
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ensureDatabases = mkOption {
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type = types.listOf types.str;
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default = [];
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description = ''
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Ensures that the specified databases exist.
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This option will never delete existing databases, especially not when the value of this
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option is changed. This means that databases created once through this option or
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otherwise have to be removed manually.
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'';
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example = [
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"nextcloud"
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"matomo"
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];
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};
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ensureUsers = mkOption {
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type = types.listOf (types.submodule {
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options = {
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name = mkOption {
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type = types.str;
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description = ''
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Name of the user to ensure.
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'';
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};
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ensurePermissions = mkOption {
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type = types.attrsOf types.str;
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default = {};
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description = ''
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Permissions to ensure for the user, specified as attribute set.
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The attribute names specify the database and tables to grant the permissions for,
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separated by a dot. You may use wildcards here.
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The attribute values specfiy the permissions to grant.
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You may specify one or multiple comma-separated SQL privileges here.
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For more information on how to specify the target
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and on which privileges exist, see the
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<link xlink:href="https://mariadb.com/kb/en/library/grant/">GRANT syntax</link>.
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The attributes are used as <code>GRANT ''${attrName} ON ''${attrValue}</code>.
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'';
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example = literalExample ''
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{
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"database.*" = "ALL PRIVILEGES";
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"*.*" = "SELECT, LOCK TABLES";
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}
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'';
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};
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};
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});
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default = [];
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description = ''
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Ensures that the specified users exist and have at least the ensured permissions.
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The MySQL users will be identified using Unix socket authentication. This authenticates the Unix user with the
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same name only, and that without the need for a password.
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This option will never delete existing users or remove permissions, especially not when the value of this
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option is changed. This means that users created and permissions assigned once through this option or
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otherwise have to be removed manually.
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'';
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example = literalExample ''
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[
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{
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name = "nextcloud";
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ensurePermissions = {
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"nextcloud.*" = "ALL PRIVILEGES";
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};
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}
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{
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name = "backup";
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ensurePermissions = {
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"*.*" = "SELECT, LOCK TABLES";
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};
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}
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]
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'';
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};
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replication = {
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role = mkOption {
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type = types.enum [ "master" "slave" "none" ];
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default = "none";
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description = "Role of the MySQL server instance.";
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};
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serverId = mkOption {
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type = types.int;
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default = 1;
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description = "Id of the MySQL server instance. This number must be unique for each instance";
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};
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masterHost = mkOption {
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type = types.str;
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description = "Hostname of the MySQL master server";
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};
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slaveHost = mkOption {
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type = types.str;
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description = "Hostname of the MySQL slave server";
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};
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masterUser = mkOption {
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type = types.str;
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description = "Username of the MySQL replication user";
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};
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masterPassword = mkOption {
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type = types.str;
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description = "Password of the MySQL replication user";
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};
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masterPort = mkOption {
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type = types.int;
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default = 3306;
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description = "Port number on which the MySQL master server runs";
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};
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};
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};
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};
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###### implementation
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config = mkIf config.services.mysql.enable {
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services.mysql.dataDir =
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mkDefault (if versionAtLeast config.system.stateVersion "17.09" then "/var/lib/mysql"
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else "/var/mysql");
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users.users.mysql = {
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description = "MySQL server user";
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group = "mysql";
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uid = config.ids.uids.mysql;
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};
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users.groups.mysql.gid = config.ids.gids.mysql;
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environment.systemPackages = [mysql];
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environment.etc."my.cnf".text =
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''
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[mysqld]
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port = ${toString cfg.port}
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datadir = ${cfg.dataDir}
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${optionalString (cfg.bind != null) "bind-address = ${cfg.bind}" }
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${optionalString (cfg.replication.role == "master" || cfg.replication.role == "slave")
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''
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log-bin=mysql-bin-${toString cfg.replication.serverId}
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log-bin-index=mysql-bin-${toString cfg.replication.serverId}.index
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relay-log=mysql-relay-bin
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server-id = ${toString cfg.replication.serverId}
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''}
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${optionalString (cfg.ensureUsers != [])
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''
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plugin-load-add = auth_socket.so
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''}
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${cfg.extraOptions}
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'';
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systemd.tmpfiles.rules = [
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"d '${cfg.dataDir}' 0700 ${cfg.user} mysql -"
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];
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systemd.services.mysql = let
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hasNotify = (cfg.package == pkgs.mariadb);
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in {
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description = "MySQL Server";
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after = [ "network.target" ];
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wantedBy = [ "multi-user.target" ];
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restartTriggers = [ config.environment.etc."my.cnf".source ];
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unitConfig.RequiresMountsFor = "${cfg.dataDir}";
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path = [
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# Needed for the mysql_install_db command in the preStart script
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# which calls the hostname command.
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pkgs.nettools
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];
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preStart = ''
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if ! test -e ${cfg.dataDir}/mysql; then
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${mysql}/bin/mysql_install_db --defaults-file=/etc/my.cnf ${installOptions}
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touch /tmp/mysql_init
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fi
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'';
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serviceConfig = {
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User = cfg.user;
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Group = "mysql";
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Type = if hasNotify then "notify" else "simple";
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RuntimeDirectory = "mysqld";
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RuntimeDirectoryMode = "0755";
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# The last two environment variables are used for starting Galera clusters
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ExecStart = "${mysql}/bin/mysqld --defaults-file=/etc/my.cnf ${mysqldOptions} $_WSREP_NEW_CLUSTER $_WSREP_START_POSITION";
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ExecStartPost =
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let
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setupScript = pkgs.writeScript "mysql-setup" ''
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#!${pkgs.runtimeShell} -e
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${optionalString (!hasNotify) ''
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# Wait until the MySQL server is available for use
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count=0
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while [ ! -e /run/mysqld/mysqld.sock ]
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do
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if [ $count -eq 30 ]
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then
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echo "Tried 30 times, giving up..."
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exit 1
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fi
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echo "MySQL daemon not yet started. Waiting for 1 second..."
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count=$((count++))
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sleep 1
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done
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''}
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if [ -f /tmp/mysql_init ]
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then
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${concatMapStrings (database: ''
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# Create initial databases
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if ! test -e "${cfg.dataDir}/${database.name}"; then
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echo "Creating initial database: ${database.name}"
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( echo 'create database `${database.name}`;'
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${optionalString (database.schema != null) ''
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echo 'use `${database.name}`;'
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# TODO: this silently falls through if database.schema does not exist,
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# we should catch this somehow and exit, but can't do it here because we're in a subshell.
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if [ -f "${database.schema}" ]
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then
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cat ${database.schema}
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elif [ -d "${database.schema}" ]
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then
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cat ${database.schema}/mysql-databases/*.sql
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fi
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''}
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) | ${mysql}/bin/mysql -u root -N
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fi
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'') cfg.initialDatabases}
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${optionalString (cfg.replication.role == "master")
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''
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# Set up the replication master
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( echo "use mysql;"
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echo "CREATE USER '${cfg.replication.masterUser}'@'${cfg.replication.slaveHost}' IDENTIFIED WITH mysql_native_password;"
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echo "SET PASSWORD FOR '${cfg.replication.masterUser}'@'${cfg.replication.slaveHost}' = PASSWORD('${cfg.replication.masterPassword}');"
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echo "GRANT REPLICATION SLAVE ON *.* TO '${cfg.replication.masterUser}'@'${cfg.replication.slaveHost}';"
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) | ${mysql}/bin/mysql -u root -N
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''}
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${optionalString (cfg.replication.role == "slave")
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''
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# Set up the replication slave
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( echo "stop slave;"
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echo "change master to master_host='${cfg.replication.masterHost}', master_user='${cfg.replication.masterUser}', master_password='${cfg.replication.masterPassword}';"
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echo "set global slave_exec_mode='IDEMPOTENT';"
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echo "start slave;"
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) | ${mysql}/bin/mysql -u root -N
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''}
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${optionalString (cfg.initialScript != null)
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''
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# Execute initial script
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# using toString to avoid copying the file to nix store if given as path instead of string,
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# as it might contain credentials
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cat ${toString cfg.initialScript} | ${mysql}/bin/mysql -u root -N
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''}
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rm /tmp/mysql_init
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fi
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${optionalString (cfg.ensureDatabases != []) ''
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(
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${concatMapStrings (database: ''
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echo "CREATE DATABASE IF NOT EXISTS \`${database}\`;"
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'') cfg.ensureDatabases}
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) | ${mysql}/bin/mysql -u root -N
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''}
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${concatMapStrings (user:
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''
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( echo "CREATE USER IF NOT EXISTS '${user.name}'@'localhost' IDENTIFIED WITH ${if isMariaDB then "unix_socket" else "auth_socket"};"
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${concatStringsSep "\n" (mapAttrsToList (database: permission: ''
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echo "GRANT ${permission} ON ${database} TO '${user.name}'@'localhost';"
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'') user.ensurePermissions)}
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) | ${mysql}/bin/mysql -u root -N
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'') cfg.ensureUsers}
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'';
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in
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# ensureDatbases & ensureUsers depends on this script being run as root
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# when the user has secured their mysql install
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"+${setupScript}";
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};
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};
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};
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}
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