Function parse

src/common/roles.cpp:45–55

TODO(haosdent): Remove this function after we stop supporting `--roles` flag in master.

// TODO(haosdent): Remove this function after we stop supporting `--roles`
// flag in master.
Try<vector<string>> parse(const string& text)
{
  vector<string> roles = strings::tokenize(text, ",");

  Option<Error> error = validate(roles);
  if (error.isSome()) {
    return error.get();
  } else {
    return roles;
  }
}


vector<string> ancestors(const string& role)