def METHOD_NAME(raw, redux, prod, model):
    global fake_env_cache
    for k in fake_env_cache:
        if k in os.environ:
            fake_env_cache[k] = os.environ[k]
    os.environ["DESI_SPECTRO_DATA"] = raw
    os.environ["DESI_ROOT"] = raw
    os.environ["DESI_SPECTRO_REDUX"] = redux
    os.environ["SPECPROD"] = prod
    os.environ["DESIMODEL"] = model
    return