nix-config/modules/nixos/homelab/containers/pi-hole.nix

{
  config,
  pkgs,
  lib,
  ...
}:

with lib;

let
  port = 8082;
in
{
  options.nixosModules.pihole.enable = mkEnableOption "Enable pihole";

  config = mkIf config.nixosModules.pihole.enable {
    virtualisation = {
      docker = {
        enable = true;
        autoPrune.enable = true;
      };

      oci-containers = {
        backend = "docker";

        containers."pihole" = {
          image = "pihole/pihole:latest";

          environment = {
            "PIHOLE_DNS_1" = "8.8.8.8";
            "PIHOLE_DNS_2" = "8.8.4.4";
            "TZ" = "Europe/London";
          };

          volumes = [
            "/home/opdavies/pihole/etc-dnsmasq.d:/etc/dnsmasq.d:rw"
            "/home/opdavies/pihole/etc-pihole:/etc/pihole:rw"
          ];

          ports = [
            "53:53/tcp"
            "53:53/udp"
            "67:67/udp"
            "${toString port}:80/tcp"
          ];

          log-driver = "journald";

          extraOptions = [
            "--cap-add=NET_ADMIN"
            "--network-alias=pihole"
            "--network=pihole_default"
          ];
        };
      };
    };

    systemd = {
      services = {
        "docker-pihole" = {
          serviceConfig = {
            Restart = lib.mkOverride 90 "always";
            RestartMaxDelaySec = lib.mkOverride 90 "1m";
            RestartSec = lib.mkOverride 90 "100ms";
            RestartSteps = lib.mkOverride 90 9;
          };

          after = [ "docker-network-pihole_default.service" ];
          requires = [ "docker-network-pihole_default.service" ];
          partOf = [ "docker-compose-pihole-root.target" ];
          wantedBy = [ "docker-compose-pihole-root.target" ];
        };

        "docker-network-pihole_default" = {
          path = [ pkgs.docker ];

          serviceConfig = {
            Type = "oneshot";
            RemainAfterExit = true;
            ExecStop = "docker network rm -f pihole_default";
          };

          script = ''
            docker network inspect pihole_default || docker network create pihole_default
          '';

          partOf = [ "docker-compose-pihole-root.target" ];
          wantedBy = [ "docker-compose-pihole-root.target" ];
        };
      };

      targets."docker-compose-pihole-root" = {
        unitConfig = {
          Description = "Root target generated by compose2nix.";
        };

        wantedBy = [ "multi-user.target" ];
      };
    };
  };
}