nixfiles/modules/deployment/default.nix

{ config, lib, pkgs, ... }:
with lib;
let cfg = config.kyouma.deployment.upgradeSystem;
in {
  options.kyouma.deployment = {
    tags = mkOption {
      type = with types; listOf str;
      default = [ ];
      description = "colmena deployment tags";
    };
    targetHost = mkOption {
      type = with types; nullOr str;
      default = null;
      description = "colmena target host override";
    };
    upgradeSystem = {
      enable = mkEnableOption "automatically apply hydra builds";
      allowReboot = mkOption {
        type = types.bool;
        default = true;
        description = "automatically reboot if needed";
      };
      branch = mkOption {
        type = types.str;
        default = "main";
        description = "branch to use for updates";
      };
      hostName = mkOption {
        type = with types; nullOr str;
        default = null;
        description = "Set hostname";
      };
      noDelay = mkOption {
        type = types.bool;
        default = false;
        description = "dont use delays";
      };
      runFreq = mkOption {
        type = types.str;
        default = "*-*-* *:04:20";
        description = "How often Updates should be fetched. See {manpage}`systemd.timer(5)`";
      };
    };
  };
  config = mkIf cfg.enable {
    systemd.services.upgrade-system = {
      requires = [ "network-online.target" ];
      after = [ "network-online.target" ];
      restartIfChanged = false;
      unitConfig.X-StopOnRemoval = false;

      serviceConfig = {
        Type = "oneshot";
        ExecStart = "${pkgs.upgrade-system}/bin/upgrade-system${optionalString cfg.allowReboot " --allow-reboot"} --branch ${cfg.branch}${
            optionalString (cfg.hostName != null) " --hostname ${cfg.hostName}"
          }${optionalString cfg.noDelay " --no-delay"}";
      };
    };
    systemd.timers.upgrade-system = {
      wantedBy = [ "timers.target" ];
      timerConfig = {
        OnCalendar = if cfg.noDelay then "*-*-* *:*:00" else cfg.runFreq;
        RandomizedDelaySec = if cfg.noDelay then "1s" else "10m";
      };
      requires = [ "network-online.target" ];
      after = [ "network-online.target" ];
    };
    environment.systemPackages = [ pkgs.upgrade-system ];
  };
}