def _validate_resource_path(path):
        """
        Validate the resource paths according to the docs.
        https://setuptools.readthedocs.io/en/latest/pkg_resources.html#basic-resource-access

        >>> warned = getfixture('recwarn')
        >>> warnings.simplefilter('always')
        >>> vrp = NullProvider._validate_resource_path
        >>> vrp('foo/bar.txt')
        >>> bool(warned)
        False
        >>> vrp('../foo/bar.txt')
        >>> bool(warned)
        True
        >>> warned.clear()
        >>> vrp('/foo/bar.txt')
        >>> bool(warned)
        True
        >>> vrp('foo/../../bar.txt')
        >>> bool(warned)
        True
        >>> warned.clear()
        >>> vrp('foo/f../bar.txt')
        >>> bool(warned)
        False

        Windows path separators are straight-up disallowed.
        >>> vrp(r'\\foo/bar.txt')
        Traceback (most recent call last):
        ...
        ValueError: Use of .. or absolute path in a resource path \
is not allowed.

        >>> vrp(r'C:\\foo/bar.txt')
        Traceback (most recent call last):
        ...
        ValueError: Use of .. or absolute path in a resource path \
is not allowed.

        Blank values are allowed

        >>> vrp('')
        >>> bool(warned)
        False

        Non-string values are not.

        >>> vrp(None)
        Traceback (most recent call last):
        ...
        AttributeError: ...
        """
        invalid = (
            os.path.pardir in path.split(posixpath.sep) or
            posixpath.isabs(path) or
            ntpath.isabs(path)
        )
        if not invalid:
            return

        msg = "Use of .. or absolute path in a resource path is not allowed."

        # Aggressively disallow Windows absolute paths
        if ntpath.isabs(path) and not posixpath.isabs(path):
            raise ValueError(msg)

        # for compatibility, warn; in future
        # raise ValueError(msg)
        warnings.warn(
            msg[:-1] + " and will raise exceptions in a future release.",
            DeprecationWarning,
            stacklevel=4,
        )

        Validate the resource paths according to the docs.
        https://setuptools.readthedocs.io/en/latest/pkg_resources.html#basic-resource-access

        >>> warned = getfixture('recwarn')
        >>> warnings.simplefilter('always')
        >>> vrp = NullProvider._validate_resource_path
        >>> vrp('foo/bar.txt')
        >>> bool(warned)
        False
        >>> vrp('../foo/bar.txt')
        >>> bool(warned)
        True
        >>> warned.clear()
        >>> vrp('/foo/bar.txt')
        >>> bool(warned)
        True
        >>> vrp('foo/../../bar.txt')
        >>> bool(warned)
        True
        >>> warned.clear()
        >>> vrp('foo/f../bar.txt')
        >>> bool(warned)
        False

        Windows path separators are straight-up disallowed.
        >>> vrp(r'\foo/bar.txt')
        Traceback (most recent call last):
        ...
        ValueError: Use of .. or absolute path in a resource path is not allowed.

        >>> vrp(r'C:\foo/bar.txt')
        Traceback (most recent call last):
        ...
        ValueError: Use of .. or absolute path in a resource path is not allowed.

        Blank values are allowed

        >>> vrp('')
        >>> bool(warned)
        False

        Non-string values are not.

        >>> vrp(None)
        Traceback (most recent call last):
        ...
        AttributeError: ...
        
src/pkg_resources/__init__.py