nixpkgs/modules/services/databases/mysql.nix

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{pkgs, config, ...}:
###### interface
let
inherit (pkgs.lib) mkOption mkIf;
options = {
services = {
mysql = {
enable = mkOption {
default = false;
description = "
Whether to enable the MySQL server.
";
};
port = mkOption {
default = "3306";
description = "Port of MySQL";
};
user = mkOption {
default = "mysql";
description = "User account under which MySQL runs";
};
dataDir = mkOption {
default = "/var/mysql";
description = "Location where MySQL stores its table files";
};
logError = mkOption {
default = "/var/log/mysql_err.log";
description = "Location of the MySQL error logfile";
};
pidDir = mkOption {
default = "/var/run/mysql";
description = "Location of the file which stores the PID of the MySQL server";
};
};
};
};
in
###### implementation
let
cfg = config.services.mysql;
mysql = pkgs.mysql;
pidFile = "${cfg.pidDir}/mysqld.pid";
mysqldOptions =
"--user=${cfg.user} --datadir=${cfg.dataDir} " +
"--log-error=${cfg.logError} --pid-file=${pidFile}";
in
mkIf config.services.mysql.enable {
require = [
options
];
users = {
extraUsers = [
{ name = "mysql";
description = "MySQL server user";
}
];
};
services = {
extraJobs = [{
name = "mysql";
extraPath = [mysql];
job = ''
description "MySQL server"
stop on shutdown
start script
if ! test -e ${cfg.dataDir}; then
mkdir -m 0700 -p ${cfg.dataDir}
chown -R ${cfg.user} ${cfg.dataDir}
${mysql}/bin/mysql_install_db ${mysqldOptions}
fi
mkdir -m 0700 -p ${cfg.pidDir}
chown -R ${cfg.user} ${cfg.pidDir}
end script
respawn ${mysql}/bin/mysqld ${mysqldOptions}
stop script
pid=$(cat ${pidFile})
kill "$pid"
${mysql}/bin/mysql_waitpid "$pid" 1000
end script
'';
}];
};
}