Re: Re: dm overlaybd: targets mapping OverlayBD image

[Du Rui]

Hi Giuseppe,

> The current OCI format, with some tweaks like (e)stargz or zstd:chunked,
> already make its content addressable and a client can retrieve only the
> subset of the files that are needed.  At the same time we maintain the
> simplicity of a tarball and it won't break existing clients.

Yes, I believe backward compatibility is very important. That's why we
have another design called foci (fast oci). It realize a virtual block
device from gzip image blobs. See the following link for details if interested.
https://github.com/containerd/accelerated-container-image/blob/main/docs/FASTOCI.md