vendor container-image-proxy

[cgwalters]

In order to use #3139 we need https://github.com/cgwalters/container-image-proxy

The thread in cgwalters/container-image-proxy#1 discusses the long term productization for that.

Short term, I'd just like to get this code out into an rpm-ostree release, still under --experimental so it's easier for people to try.

The proposal here is:

• git submodule add container-image-proxy https://github.com/cgwalters/container-image-proxy
• Build and ship it in the rpm-ostree RPM for now, installed in e.g. /usr/lib/rpm-ostree/container-image-proxy

Two questions:

• Any objections?
• Is there a better way to do this?

[jlebon]

No strong objection, though it's going to be really confusing having golang, C, C++, and Rust in a single codebase.

Have you approached the containers team about cgwalters/container-image-proxy#1 yet? I wonder if they'd be open to shipping it as a subpackage of skopeo for now.

[cgwalters]

though it's going to be really confusing having golang, C, C++, and Rust in a single codebase.

Well...it's not in a single process. I think touching the proxy code would be rare. But yes, OK:
OK containers/skopeo#1476