/*
   * Add RPM database to Pool.
   *
   * For chrooted RPM databases, pass the toplevel directory as
   * parameter.
   *
   * Returns a newly created Repository
   *
   * call-seq:
   *   pool.add_rpmdb -> Repo
   *   pool.add_rpmdb("/space/chroot") -> Repo
   *
   */
  Repo *add_rpmdb( const char *rootdir )