nglib:
let
  inherit (nglib "x86_64-linux") makeSystem;
in
{
  postgresql = makeSystem {
    system = "x86_64-linux";
    name = "nixng-hydra-postgresql";
    config = { pkgs, config, ... }:
      {
        config = {
          dumb-init = {
            enable = true;
            type.services = {};
          };
          services.postgresql = {
            enable = true;
            package = pkgs.postgresql_12;

            initialScript = "/secrets/init.sql";
            enableTCPIP = true;

            authentication = "host  all all all          md5";

            ensureDatabases = [ "hydra" ];
            ensureExtensions = {
              "pg_trgm" = [ "hydra" ];
            };
            ensureUsers = [
              { name = "hydra"; ensurePermissions = {
                  "DATABASE \"hydra\"" = "ALL PRIVILEGES";
                };
              }
            ];
          };
        };
      };
  };

  hydra = makeSystem {
    system = "x86_64-linux";
    name = "nixng-hydra";
    config = { pkgs, config, ... }:
      {
        config = {
          dumb-init = {
            enable = true;
            type.services = {};
          };
          nix = {
            package = pkgs.nixFlakes.override {
              src = pkgs.fetchFromGitHub {
                owner = "MagicRB";
                repo = "nix";
                rev = "a02c34500960b8bc18fe1bdc1431ea252573a5cf";
                sha256 = "sha256-6VbjvNIDxPdjA+FcY2Kh1vSh8RJ7ubezqprTy81lq9U=";
              };
            };
            loadNixDb = true;
            overlayNix = "/nix-persist";
            config = {
              experimental-features = [ "nix-command" "flakes" ];
              sandbox = true;
              trusted-public-keys = [ "cache.nixos.org-1:6NCHdD59X431o0gWypbMrAURkbJ16ZPMQFGspcDShjY=" ];
              substituters = [ "https://cache.nixos.org/" ];
              ignored-acls = [ "system.nfs4_acl" ];
            };
          };
          services.hydra = {
            enable = true;
            hydraURL = "https://hydra.redalder.org";
            notificationSender = "hydra@redalder.org";
            useSubstitutes = true;

            dbiFile = "/local/dbi";
          };
          services.socklog = {
            enable = true;
            unix = "/dev/log";
          };

          init.services.pgpass = {
            script = pkgs.writeShellScript "pgpass" ''
              ln -nsf /secrets/pgpass /var/lib/hydra/pgpass
              ln -nsf /secrets/pgpass-www /var/lib/hydra/pgpass-www
              ln -nsf /secrets/pgpass-queue-runner /var/lib/hydra/pgpass-queue-runner

              chown hydra:hydra /secrets/pgpass
              chown hydra-www:hydra /secrets/pgpass-www
              chown hydra-queue-runner:hydra /secrets/pgpass-queue-runner
              sv down pgpass
            '';
            enabled = true;
          };
        };
      };
  };
}