def get_version_requested(path):
    """Return string listing requested Terraform version."""
    tf_version_path = os.path.join(path,
                                   TF_VERSION_FILENAME)
    if not os.path.isfile(tf_version_path):
        LOGGER.error("Terraform install attempted and no %s file present to "
                     "dictate the version. Please create it (e.g.  write "
                     "\"0.11.13\" (without quotes) to the file and try again",
                     TF_VERSION_FILENAME)
        sys.exit(1)
    with open(tf_version_path, 'r') as stream:
        ver = stream.read().rstrip()
    return ver
Return string listing requested Terraform version.