https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=254645

--- Comment #3 from Mateusz Kwiatkowski <[email protected]> ---
(In reply to Luca Pizzamiglio from comment #2)
Hi Luca,

Thank you for questions.

> * I'm using skopeo to download docker images and convert them to OCI format. 
> How did you configured the storage driver in etc/containers/storage.conf
> AFAIK, zfs is supported (it would be ideal), but it would work only for root

This storage configuration matters in runtime context. I only briefly played
with containerd with nullfs snapshotter. For more runtime details I'd refer to
great Samuel's work: https://github.com/samuelkarp/runj

> * one important information that FreeBSD OCI images should have is the 
> os.version, to enforce proper check on jails and host messages. Do you think 
> os.version (in the manifest field of index.json) is a suitable place or it 
> would be better to adopt a custom annotation?

Yes, we can put whatever is needed for runtime to validate images. I created
minimal draft of runtime spec for FreeBSD for my needs:
https://github.com/runhyve/umoci/commit/759dccf4cbbe47a54ca2ef3d44d9c3eb83d7a157
And Samuel made his own draft:
https://github.com/samuelkarp/runj/blob/main/runtimespec/config.go

I think that these specs would grow and stabilize over time and in the future
they should be submitted as official OCI spec:
https://github.com/opencontainers/runtime-spec/blob/master/specs-go/config.go

os.version in particular could land in FreeBSD specific subtree of schema.
Here's example for Solaris:
https://github.com/opencontainers/runtime-spec/blob/master/schema/config-solaris.json

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