update mode use the new cache

                          help="name of the file to update. Default PKGBUILD")

    p_update.add_argument("-c", "--checksum", action="store_true",

                          help="run updpkgsums after update")

    p_update.add_argument("-S", "--no-save", dest="save", action="store_false",

                           help="don't save version updates in cache")

    p_update.add_argument("-S", "--no-sync", action="store_false",

                           help="don't sync packages versions prior update")

    p_update.set_defaults(func=command_update)

    # do parse

    namespace = p_main.parse_args()

        raise BaseError("No registered package %s" % pkgname)

    # redure packge list to the extracted one

    vctrl.reduce_packages((pkgname,))

    # sync if not refused

    if not args.no_sync:

        vctrl.sync_packages()

    # get upstream version

    upver = list(vctrl.check_versions())[0][1]

    upver = vctrl.cache["upstream"].get(pkgname, {}).get("version", None)

    if upver is None:

        raise BaseError("Unable to detect upstream version of %s" % pkgname)

    # save cache

    if args.save:

        vctrl.cache.save(args.cache, DEFAULT_CACHE_FILENAME)

    # print what we detect

    print("Package name: %s" % pkgname)

    print("PKGBUILD version: %s" % pkgver)

    print("Upstream version: %s" % vctrl.cache[pkgname])

    print("Upstream version: %s" % upver)

    # compare version

    if pkgver == upver:

        print("Version are the same. Do nothing!")