libimage artifact support shared between CRI-O and Podman

[saschagrunert]

CRI-O will add experimental artifact management (pull, list, inspect, remove) support in cri-o/cri-o#8996, which should land in v1.33. In addition, we also like to add artifact mount support similar to containers/podman#25397 to support artifacts in image volume mounts (kubernetes/enhancements#4639).

Podman added artifact support in 5.4, but has generally a broader set of features, like artifact push and extract.

We should find the similarities in the implementations and move common code to this library when the features are considered as somewhat stable.

cc @bitoku

[Luap99]

Duplicate of containers/podman#25259?!

which should land in v1.33

What does that mean in term of actual dates?

In general I am reluctant to move this code into c/common and promise a stable API right now. Artifacts are far from thought out, the current implementation is missing locking and we have no support for podman-remote yet. These kind of things could require a fair amount of changes to the API so I would not like to commit to this. Moving it into c/common will also make it harder for us to iterate on as part of podman.

[saschagrunert]

Duplicate of containers/podman#25259?!

Yes, I created this one for a better visibility.

which should land in v1.33

What does that mean in term of actual dates?

Kubernetes v1.33 is planned for Wednesday 23rd April 2025: https://github.com/kubernetes/sig-release/tree/master/releases/release-1.33

CRI-O will be released usually a couple of days later.

[baude]

FWIW, I dont think it should be part of libimage. There will be people that want to use the library without libimage. That said, that's my initial thoughts and could be convinced without much effort otherwise.

[baude]

speaking of which ... if anyone wants to contribute a locking PR, that would move things along. We are now in a bug week which means we wont really be able to get to it for a little while. if you do this, make sure containers/podman#25397 is merged.