return nil, fmt.Errorf("module downloaded from %v has checksum %v, which does not match: %v", key.downloadURL, dChecksum, key.checksum)
	}

	if binaryFetcher != nil {
		b, err = binaryFetcher()
		if err != nil {
			wasmRemoteFetchCount.With(resultTag.Value(downloadFailure)).Increment()
			return nil, fmt.Errorf("could not fetch Wasm binary: %v", err)
		}
	}

// Wasm binary is not fetched immediately, but returned by `binaryFetcher` function, which is returned by PrepareFetch.
// By this way, we can have another chance to check cache with `actualDigest` without downloading the OCI image.
func (o *ImageFetcher) PrepareFetch(url string) (binaryFetcher func() ([]byte, error), actualDigest string, err error) {
	ref, err := name.ParseReference(url)
	if err != nil {