def _lookup_version(module_file):
    """
    For the given module file (usually found by:

        from package import __file__ as module_file

    in the caller, return the location of
    the current RELEASE-VERSION file and the file
    itself.
    """
    version_dir = path.abspath(path.dirname(module_file))
    version_file = path.join(version_dir, "RELEASE-VERSION")
    return version_dir, version_file