def get_filesystem_encoding():
    """Returns the filesystem encoding that should be used. Note that this is
    different from the Python understanding of the filesystem encoding which
    might be deeply flawed. Do not use this value against Python's unicode APIs
    because it might be different. See :ref:`filesystem-encoding` for the exact
    behavior.

    The concept of a filesystem encoding in generally is not something you
    should rely on. As such if you ever need to use this function except for
    writing wrapper code reconsider.
    """
    global _warned_about_filesystem_encoding
    rv = sys.getfilesystemencoding()
    if has_likely_buggy_unicode_filesystem and not rv or _is_ascii_encoding(rv):
        if not _warned_about_filesystem_encoding:
            warnings.warn(
                "Detected a misconfigured UNIX filesystem: Will use"
                " UTF-8 as filesystem encoding instead of {0!r}".format(rv),
                BrokenFilesystemWarning,
            )
            _warned_about_filesystem_encoding = True
        return "utf-8"
    return rv