nixos-config/modules/server/minecraft.nix

{
  pkgs,
  lib,
  config,
  ...
}:
with lib;
let
  serverStdinPath = config.systemd.sockets.minecraft-server.socketConfig.ListenFIFO;
in
{
  options.my.server.papermc.enable = mkOption {
    type = types.bool;
    default = false;
  };

  config = mkIf config.my.server.papermc.enable {
    services.minecraft-server = {
      enable = true;
      package = pkgs.papermc;
      dataDir = "/srv/minecraft";
      openFirewall = true;
      eula = true;
    };

    systemd.services."minecraft-server-backup" = {
      path = with pkgs; [
        gnutar
        gzip
      ];

      script = ''
        echo 'say Une backup du serveur va commencer dans 1 minute.' > ${serverStdinPath}
        sleep 1m

        cat << EOF > ${serverStdinPath}
        say Sauvegarde en cours...
        save-off
        save-all
        EOF

        tar -cpzf /srv/minecraft-backups/backup-$(date -u +%Y%m%d_%H%M%S).tar.gz ${config.services.minecraft-server.dataDir}

        cat << EOF > ${serverStdinPath}
        save-on
        say Sauvegarde terminée !
        EOF

        # Deleting saves older than 2 weeks
        find /srv/minecraft-backups/ -type f -mtime +14 -name 'backup-*.tar.gz' -delete
      '';

      serviceConfig = {
        Type = "oneshot";
        User = "root";
      };

      startAt = "*-*-* 00:00,12:00";
    };
  };
}