def update_config(config, fcdir=None):
    config, directories = normalize_config(config, fcdir)
    if config.get("upload", {}).get("dir"):
        directories.append(config["upload"]["dir"])
    mounts = {}
    for i, d in enumerate(sorted(set(directories))):
        mounts[d] = d
    mounts = ["%s:%s" % (k, v) for k, v in mounts.items()]
    config = remap.external_to_docker(config, mounts)
    return config, mounts
The value of the `Last-Modified` header, if available.
dataset/ETHPy150Open chapmanb/bcbio-nextgen-vm/bcbiovm/docker/mounts.py/update_config--crossover with--dataset/ETHPy150Open nigelsmall/httpstream/httpstream/http.py/Response.last_modified