How to use the clldutils.jsonlib.update function in clldutils

valueset=vs))

    for vs in DBSession.query(common.ValueSet)\
            .join(common.Language)\
            .join(common.Parameter)\
            .filter(common.Parameter.id == 'macroarea')\
            .options(joinedload(common.ValueSet.values), joinedload(common.ValueSet.language)):
        vs.language.macroareas = ', '.join([macroareas[v.domainelement_pk][1] for v in vs.values])

    for row in list(DBSession.execute(
        "select pk, pages, pages_int, startpage_int from source where pages_int < 0"
    )):
        raise ValueError(row)

    version = assert_release(args.repos.repos)
    with jsonlib.update(gc2version(args), indent=4) as legacy:
        for lang in DBSession.query(common.Language):
            if lang.id not in legacy:
                lang.update_jsondata(new=True)
                legacy[lang.id] = version

    valuesets = {
        r[0]: r[1] for r in DBSession.query(common.ValueSet.id, common.ValueSet.pk)}
    refs = {
        r[0]: r[1]
        for r in DBSession.query(models.Refprovider.id, models.Refprovider.ref_pk)}

    for vsid, vspk in valuesets.items():
        if vsid.startswith('macroarea-'):
            DBSession.add(common.ValueSetReference(
                source_pk=refs[args.repos.macroareas.__defaults__['reference_id']],
                valueset_pk=vspk))

break
                else:
                    bitstream = None
                if bitstream:
                    if bitstream._properties['checksum'] != md5(fname):
                        bitstream.delete()
                    else:
                        skip = True
                        print('skipping {0}'.format(fname.name))
                if not skip:
                    print(fname.name)
                    obj.add_bitstream(fname=fname.as_posix(), name=bsname)
        obj.read()
        cat.add(obj, update=True)

    with update(dlfname, default=collections.OrderedDict(), indent=4, sort_keys=True) as downloads:
        for oid, spec in load(args.catalog).items():
            if 'metadata' in spec and 'title' in spec['metadata']:
                match = title_pattern.match(spec['metadata']['title'])
                if match:
                    if (match.group('version') not in downloads) or match.group('version') == release:
                        args.log.info('update info for release {0}'.format(match.group('version')))
                        spec['oid'] = oid
                        downloads[match.group('version')] = spec
    args.log.info('{0} written'.format(dlfname))
    args.log.info('{0}'.format(args.catalog))