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{ config, lib, pkgs, ... }:
let
inherit (lib) concatMapStringsSep concatStringsSep isInt isList literalExpression;
inherit (lib) mapAttrs mapAttrsToList mkDefault mkEnableOption mkIf mkOption mkRenamedOptionModule optional types;
cfg = config.services.automysqlbackup;
pkg = pkgs.automysqlbackup;
user = "automysqlbackup";
group = "automysqlbackup";
toStr = val:
if isList val then "( ${concatMapStringsSep " " (val: "'${val}'") val} )"
else if isInt val then toString val
else if true == val then "'yes'"
else if false == val then "'no'"
else "'${toString val}'";
configFile = pkgs.writeText "automysqlbackup.conf" ''
#version=${pkg.version}
# DONT'T REMOVE THE PREVIOUS VERSION LINE!
#
${concatStringsSep "\n" (mapAttrsToList (name: value: "CONFIG_${name}=${toStr value}") cfg.config)}
'';
in
{
imports = [
(mkRenamedOptionModule [ "services" "automysqlbackup" "config" ] [ "services" "automysqlbackup" "settings" ])
];
# interface
options = {
services.automysqlbackup = {
enable = mkEnableOption (lib.mdDoc "AutoMySQLBackup");
calendar = mkOption {
type = types.str;
default = "01:15:00";
description = lib.mdDoc ''
Configured when to run the backup service systemd unit (DayOfWeek Year-Month-Day Hour:Minute:Second).
'';
};
settings = mkOption {
type = with types; attrsOf (oneOf [ str int bool (listOf str) ]);
default = {};
description = lib.mdDoc ''
automysqlbackup configuration. Refer to
{file}`''${pkgs.automysqlbackup}/etc/automysqlbackup.conf`
for details on supported values.
'';
example = literalExpression ''
{
db_names = [ "nextcloud" "matomo" ];
table_exclude = [ "nextcloud.oc_users" "nextcloud.oc_whats_new" ];
mailcontent = "log";
mail_address = "admin@example.org";
}
'';
};
};
};
# implementation
config = mkIf cfg.enable {
assertions = [
{ assertion = !config.services.mysqlBackup.enable;
message = "Please choose one of services.mysqlBackup or services.automysqlbackup.";
}
];
services.automysqlbackup.config = mapAttrs (name: mkDefault) {
mysql_dump_username = user;
mysql_dump_host = "localhost";
mysql_dump_socket = "/run/mysqld/mysqld.sock";
backup_dir = "/var/backup/mysql";
db_exclude = [ "information_schema" "performance_schema" ];
mailcontent = "stdout";
mysql_dump_single_transaction = true;
};
systemd.timers.automysqlbackup = {
description = "automysqlbackup timer";
wantedBy = [ "timers.target" ];
timerConfig = {
OnCalendar = cfg.calendar;
AccuracySec = "5m";
};
};
systemd.services.automysqlbackup = {
description = "automysqlbackup service";
serviceConfig = {
User = user;
Group = group;
ExecStart = "${pkg}/bin/automysqlbackup ${configFile}";
};
};
environment.systemPackages = [ pkg ];
users.users.${user} = {
group = group;
isSystemUser = true;
};
users.groups.${group} = { };
systemd.tmpfiles.rules = [
"d '${cfg.config.backup_dir}' 0750 ${user} ${group} - -"
];
services.mysql.ensureUsers = optional (config.services.mysql.enable && cfg.config.mysql_dump_host == "localhost") {
name = user;
ensurePermissions = {
"*.*" = "SELECT, SHOW VIEW, TRIGGER, LOCK TABLES, EVENT";
# https://forums.mysql.com/read.php?10,668311,668315#msg-668315
"function sys.extract_table_from_file_name" = "execute";
"function sys.format_path" = "execute";
"function sys.format_statement" = "execute";
"function sys.extract_schema_from_file_name" = "execute";
"function sys.ps_thread_account" = "execute";
"function sys.format_time" = "execute";
"function sys.format_bytes" = "execute";
};
};
};
}
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