void UserUtil::compute_user_name()

in src/hbase/utils/user-util.cc [37:76]

• 32 lines of code
• 8 McCabe index (conditional complexity)

void UserUtil::compute_user_name(bool secure) {
  // According to the man page of getpwuid
  // this should never be free'd
  //
  // So yeah a raw pointer with no ownership....
  struct passwd *passwd = getpwuid(getuid());

  // make sure that we got something.
  if (passwd && passwd->pw_name) {
    user_name_ = std::string{passwd->pw_name};
  }
  if (!secure) return;
  krb5_context ctx;
  krb5_error_code ret = krb5_init_context(&ctx);
  if (ret != 0) {
    throw std::runtime_error("cannot init krb ctx " + std::to_string(ret));
  }
  krb5_ccache ccache;
  ret = krb5_cc_default(ctx, &ccache);
  if (ret != 0) {
    throw std::runtime_error("cannot get default cache " + std::to_string(ret));
  }
  // Here is sample principal: hbase/23a03935850c@EXAMPLE.COM
  // There may be one (user) or two (user/host) components before the @ sign
  krb5_principal princ;
  ret = krb5_cc_get_principal(ctx, ccache, &princ);
  if (ret != 0) {
    throw std::runtime_error("cannot get default principal " + std::to_string(ret));
  }
  user_name_ = princ->data->data;
  if (krb5_princ_size(ctx, princ) >= 2) {
    user_name_ += "/";
    user_name_ += static_cast<char *>(princ->data[1].data);
  }
  user_name_ += "@";
  user_name_ += princ->realm.data;
  VLOG(1) << "user " << user_name_;
  krb5_free_principal(ctx, princ);
  krb5_free_context(ctx);
}