try:
        bytesio=BytesIO()

        # Setup piping: curl | tarin
        tarin = tarfile.open(fileobj=bytesio , mode='r|')
        curl = Popen(['curl', '-#', '--fail', '-L', '--retry', '8', url], stdout=PIPE)

        # Seutp piping: tarout | docker
        docker = Popen(['docker', 'load'], stdin=PIPE)
        tarout = tarfile.open(mode='w|', fileobj=docker.stdin, format=tarfile.GNU_FORMAT)

        dctx=zstandard.ZstdDecompressor()
        with dctx.stream_reader(curl.stdout) as reader:
            while True:
                chunk = reader.read(16384)
                if not chunk:
                    break
                stream_pos=0
                bytesio.write(chunk)
                # Read from tarin and write to tarout
                for member in tarin:
                # Write non-file members directly (don't use extractfile on links)
                    stream_pos += member.size
                    if not member.isfile():
                        tarout.addfile(member)
                        continue

                    # Open reader for the member
                    reader = tarin.extractfile(member)

                    # If member is repository, we parse and possibly rewrite the image tags
                    if member.name == 'repositories':
                        # Read and parse repositories
                        repos = json.loads(reader.read())
                        reader.close()

                        # If there is more than one image or tag, we can't handle it here
                        if len(repos.keys()) > 1:
                            raise Exception('file contains more than one image')
                        image = repos.keys()[0]
                        if len(repos[image].keys()) > 1:
                            raise Exception('file contains more than one tag')
                        tag = repos[image].keys()[0]
                        layer = repos[image][tag]

                        # Rewrite the repositories file
                        data = json.dumps({imageName or image: {imageTag or tag: layer}})
                        reader = BytesIO(data)
                        member.size = len(data)

                    # Add member and reader
                    tarout.addfile(member, reader)
                    reader.close()
                #Move bytesio ahead so that the data of members(which have been written to tarout) is removed.
                #Thus avoiding MemoryError
                bytesio.seek(stream_pos)
                bytesio=BytesIO(bytesio.read())

        tarout.close()
    except Exception:
        error = sys.exc_info()[0]