/*
  * JGit doesn't have ls-remote command independent from repository yet.
  * That way, we have a hack here: if http response asked for a password, then the url is at least valid and existant, and we consider
  * that the test passed.
  */
 private boolean test(String url) {
   final GitLineHandlerPasswordRequestAware handler =
       new GitLineHandlerPasswordRequestAware(myProject, new File("."), GitCommand.LS_REMOTE);
   handler.setRemoteProtocol(url);
   handler.addParameters(url, "master");
   GitTask task = new GitTask(myProject, handler, GitBundle.message("clone.testing", url));
   GitTaskResult result = task.executeModal();
   boolean authFailed = handler.hadAuthRequest();
   return result.isOK() || authFailed;
 }
  private GitFetchResult fetchNatively(
      @NotNull VirtualFile root, @NotNull GitRemote remote, @Nullable String branch) {
    final GitLineHandlerPasswordRequestAware h =
        new GitLineHandlerPasswordRequestAware(myProject, root, GitCommand.FETCH);
    h.addProgressParameter();
    if (GitVersionSpecialty.SUPPORTS_FETCH_PRUNE.existsIn(myVcs.getVersion())) {
      h.addParameters("--prune");
    }

    String remoteName = remote.getName();
    h.addParameters(remoteName);
    if (branch != null) {
      h.addParameters(getFetchSpecForBranch(branch, remoteName));
    }

    final GitTask fetchTask = new GitTask(myProject, h, "Fetching " + remote.getFirstUrl());
    fetchTask.setProgressIndicator(myProgressIndicator);
    fetchTask.setProgressAnalyzer(new GitStandardProgressAnalyzer());

    GitFetchPruneDetector pruneDetector = new GitFetchPruneDetector();
    h.addLineListener(pruneDetector);

    final AtomicReference<GitFetchResult> result = new AtomicReference<GitFetchResult>();
    fetchTask.execute(
        true,
        false,
        new GitTaskResultHandlerAdapter() {
          @Override
          protected void onSuccess() {
            result.set(GitFetchResult.success());
          }

          @Override
          protected void onCancel() {
            LOG.info("Cancelled fetch.");
            result.set(GitFetchResult.cancel());
          }

          @Override
          protected void onFailure() {
            LOG.info("Error fetching: " + h.errors());
            if (!h.hadAuthRequest()) {
              myErrors.addAll(h.errors());
            } else {
              myErrors.add(new VcsException("Authentication failed"));
            }
            result.set(GitFetchResult.error(myErrors));
          }
        });

    result.get().addPruneInfo(pruneDetector.getPrunedRefs());
    return result.get();
  }