{
  config,
  lib,
  pkgs,
  inputs,
  xinlib,
  ...
}: let
  inherit (xinlib) prIsOpen;
  jobs = [
    {
      name = "xin-ci-update";
      user = "qbit";
      script = "cd ~/src/xin && ./bin/ci update";
      startAt = "23:00";
      path = [];
    }
    {
      name = "xin-ci";
      user = "qbit";
      script = "cd ~/src/xin && ./bin/ci";
      startAt = "*:30:00";
      path = [];
    }
  ];
in
  with lib; {
    options = {
      xinCI = {
        enable = mkEnableOption "Configure host as a xin CI host.";

        user = mkOption {
          type = types.str;
          default = "root";
          description = ''
            User who will own the CI private key.
          '';
        };
      };
    };

    imports = [../modules/ts-rev-prox.nix];
    config = mkIf config.xinCI.enable {
      sops.defaultSopsFile = config.xin-secrets.ci;
      sops.secrets = {
        po_env = {owner = config.xinCI.user;};
        ci_ed25519_key = {
          mode = "400";
          owner = config.xinCI.user;
        };
        ci_ed25519_pub = {
          mode = "444";
          owner = config.xinCI.user;
        };
        ci_signing_ed25519_key = {
          mode = "400";
          owner = config.xinCI.user;
        };
        ci_signing_ed25519_pub = {
          mode = "444";
          owner = config.xinCI.user;
        };
        bin_cache_priv_key = {
          mode = "400";
          owner = "root";
          group = "wheel";
        };
        bin_cache_pub_key = {
          mode = "444";
          owner = "root";
          group = "wheel";
        };
        ts_proxy_env = {
          mode = "400";
          owner = config.services.tsrevprox.user;
        };
      };
      environment.systemPackages = with pkgs; [
        inputs.po.packages.${pkgs.system}.po
        keychain
      ];

      nix = {
        #settings.allowed-users = [ "root" config.xinCI.user "nix-serve" ];
        settings.allowed-users = ["root" config.xinCI.user "harmonia"];
      };

      systemd.services = lib.listToAttrs (builtins.map xinlib.jobToService jobs);

      services.cron = prIsOpen.option 238971 {
        enable = true;
        systemCronJobs = [
          "0 0 * * *  systemctl start xin-ci-update"
          "30 * * * *  systemctl start xin-ci"
        ];
      };

      services = {
        tsrevprox = {
          enable = true;
          reverseName = "nix-binary-cache";
          envFile = config.sops.secrets.ts_proxy_env.path;
        };
        harmonia = {
          enable = true;
          signKeyPath = config.sops.secrets.bin_cache_priv_key.path;
          settings = {bind = "127.0.0.1:5000";};
        };
        #nix-serve = {
        #  package = pkgs.nix-serve-ng;
        #  enable = true;
        #  secretKeyFile = config.sops.secrets.bin_cache_priv_key.path;
        #  bindAddress = "127.0.0.1";
        #};
      };

      boot.binfmt.emulatedSystems = ["aarch64-linux" "armv6l-linux"];
    };
  }