Module Request: nixos/zerotier-systemd-manager

[ferrine]

Nixpkgs version

• Unstable (25.05)

Describe the proposed module

in #391247 package allows to monitor zerotier interfaces and update DNS periodically. To use this in NixOS, there should be a module to allow that.

Additional context

I've done this for my personal use

{
  pkgs,
  lib,
  config,
  ...
}:
let
  cfg = config.services.zerotier-systemd-manager;
in
  {
    options.services.zerotier-systemd-manager = {
      enable = lib.mkEnableOption "Zerotier DNS Update Service";
      package = lib.mkPackageOption pkgs "zerotier-systemd-manager" { };
    };
    config = lib.mkIf cfg.enable {
      assertions = [
        {
          assertion = config.systemd.network.enable;
          message = ''
            This module relies on systemd-networkd to manage DNS records per iterface,
            please enable it with

            systemd.network.enable = true.

            In case you use NetworkManager, you might also need

            systemd.network.wait-online.enable = false;

            See more info on how to enable systemd-networkd in https://nixos.wiki/wiki/Systemd-networkd
          '';
        }
      ];
      systemd.services.zerotier-dns-update = {
        description = "Update zerotier per-interface DNS settings";
        requires = [ "zerotierone.service" ];
        after = [ "zerotierone.service" ];
        serviceConfig = {
          Type = "oneshot";
          ExecStart = "${cfg.package}/bin/zerotier-systemd-manager";
        };
      };
      systemd.timers.zerotier-dns-update = {
        description = "Update zerotier per-interface DNS settings";
        wantedBy = [ "timers.target" ];
        timerConfig = {
          OnStartupSec = "1min";
          OnUnitInactiveSec = "1min";
        };
        unitConfig = {
          Description = "Update zerotier per-interface DNS settings";
        };
      };
    };
  }

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