nixos/borgbackup: add package option

      backupScript = mkBackupScript backupJobName cfg;

    in nameValuePair backupJobName {

      description = "BorgBackup job ${name}";

      path = with pkgs; [

        borgbackup openssh

      path =  [

        config.services.borgbackup.package pkgs.openssh

      ];

      script = "exec " + optionalString cfg.inhibitsSleep ''\

        ${pkgs.systemd}/bin/systemd-inhibit \

    '');

  mkBorgWrapper = name: cfg: mkWrapperDrv {

    original = "${pkgs.borgbackup}/bin/borg";

    original = getExe config.services.borgbackup.package;

    name = "borg-job-${name}";

    set = { BORG_REPO = cfg.repo; } // (mkPassEnv cfg) // cfg.environment;

  };

  ###### interface

  options.services.borgbackup.package = mkPackageOptionMD pkgs "borgbackup" { };

  options.services.borgbackup.jobs = mkOption {

    description = lib.mdDoc ''

      Deduplicating backups using BorgBackup.

      users = mkMerge (mapAttrsToList mkUsersConfig repos);

      environment.systemPackages = with pkgs; [ borgbackup ] ++ (mapAttrsToList mkBorgWrapper jobs);

      environment.systemPackages =

        [ config.services.borgbackup.package ] ++ (mapAttrsToList mkBorgWrapper jobs);

    });

}