lines['status'] = InvokeStatus.passed  # default to passed
    start_line = lines['start']
    end_line = lines.get('end', lines.get('next_url', len(log_lines))) - 1
    k = end_line
    while k > start_line:
      backtrack_line = log_lines[k]
      build_failed = backtrack_line.startswith(FAILED_BUILD_LINE)
      if build_failed or not backtrack_line.startswith(BUILD_STATUS_LINE):
        tests_failed = False

  default_python_bin_path = sys.executable
  ask_python_bin_path = ('Please specify the location of python. [Default is '
                         '{}]: ').format(default_python_bin_path)
  while True:
    python_bin_path = get_from_env_or_user_or_default(environ_cp,
                                                      'PYTHON_BIN_PATH',
                                                      ask_python_bin_path,