func (p *puller) pullOCI(ctx context.Context, ref reference.Named, mfst *ocischema.DeserializedManifest, platform *ocispec.Platform) (id digest.Digest, manifestDigest digest.Digest, err error) {
    manifestDigest, err = schema2ManifestDigest(ref, mfst)
    if err != nil {
        return "", "", err
    }