How to use the productmd.images.Images function in productmd

def compose__import_images(request, release_id, composeinfo, image_manifest):
    release_obj = release_models.Release.objects.get(release_id=release_id)

    ci = productmd.composeinfo.ComposeInfo()
    common_hacks.deserialize_wrapper(ci.deserialize, composeinfo)

    im = productmd.images.Images()
    common_hacks.deserialize_wrapper(im.deserialize, image_manifest)

    _maybe_raise_inconsistency_error(ci, im, 'images')

    compose_date = "%s-%s-%s" % (ci.compose.date[:4], ci.compose.date[4:6], ci.compose.date[6:])
    compose_type = models.ComposeType.objects.get(name=ci.compose.type)
    compose_obj, created = lib._logged_get_or_create(
        request, models.Compose,
        release=release_obj,
        compose_id=ci.compose.id,
        compose_date=compose_date,
        compose_type=compose_type,
        compose_respin=ci.compose.respin,
        compose_label=ci.compose.label or None,
    )
    if created and hasattr(request._request, '_messagings'):

def retrieve(self, request, **kwargs):
        """
        __Method__: `GET`

        __URL__: $LINK:composeimage-detail:compose_id$

        This API end-point allows retrieving RPM manifest for a given compose.
        It will return the exact same data as was imported.
        """
        compose = get_object_or_404(Compose, compose_id=kwargs['compose_id'])
        cimages = ComposeImage.objects.filter(variant_arch__variant__compose=compose)

        manifest = Images()
        manifest.compose.date = compose.compose_date.strftime('%Y%m%d')
        manifest.compose.id = compose.compose_id
        manifest.compose.respin = compose.compose_respin
        manifest.compose.type = compose.compose_type.name

        for cimage in cimages:
            im = Image(None)
            im.path = os.path.join(cimage.path.path, cimage.image.file_name)
            im.arch = cimage.image.arch
            im.bootable = cimage.image.bootable
            im.mtime = cimage.image.mtime
            im.size = cimage.image.size
            im.volume_id = cimage.image.volume_id
            im.type = cimage.image.image_type.name
            im.format = cimage.image.image_format.name
            im.arch = cimage.image.arch