Ubuntu 22.04 / 22.10 images are missing riscv64 architecture

[tmcgilchrist]

Reported by @mtelvers the Ubuntu images on docker hub are missing riscv 64 support in the latest versions. See https://hub.docker.com/_/ubuntu/tags?page=1&name=22.10 and https://hub.docker.com/_/ubuntu/tags?page=1&name=22.04.

Causing the docker pipeline to fail and our riscv based images to be out of date. Based on the scarcity of riscv hardware we are only really using the riscv hardware for building these images and for some minor testing. We could one of:

1. Use the oldest published version that did include riscv support
2. Use an alternative image like https://hub.docker.com/r/riscv64/ubuntu/
3. Remove publishing images until we get more hardware online and Ubuntu starts publishing docker images again.

Option 1 seems reasonable for now. Other than the ocluster-worker and base-image-builder, is anyone else relying on these images? @dra27

[mtelvers]

For the latest ocluster worker deployment, we went with option 1, using FROM ubuntu:jammy-20221130 as that is the latest version which supports riscv. Dockerfile.worker

[dra27]

What's the "correct" thing here? Should we be using riscv64/ubuntu in general?

[dra27]

i.e. is there any information on the change in support of riscv64

[kit-ty-kate]

Not much apart from "this is intentional and we're talking about it to possibly bring it back later" docker-library/official-images#13950 (comment)

[MisterDA]

I'm suggesting to use the images from riscv64/ubuntu:

• Use DockerHub user risvc64/ubuntu ocaml-dockerfile#150
• Use DockerHub user risvc64/ubuntu #214

[MisterDA]

What's the "correct" thing here? Should we be using riscv64/ubuntu in general?

I've pushed this change, enabling the riscv64 Ubuntu images again (and the multiarch tags as well).

[tmcgilchrist]

@benmandrew With the 23.10 upgrade docker base images is missing RiscV support again. See https://images.ci.ocaml.org/job/2023-10-31/060912-ocluster-build-fd0e13

[benmandrew]

The Ubuntu build page shows that Mantic has been built successfully on riscv64 and is up-to-date: https://launchpad.net/~cloud-images-release-managers/+livefs/ubuntu/mantic/ubuntu-oci.

The riscv64/ubuntu Docker page hasn't had updates in 10 months. I sent an email a few weeks ago to Steve Langasek (listed on the Launchpad page) about this but I've not had a response. I'll try contacting other members of the team, but it's a little difficult to find who's responsible.

[shonfeder]

@mtelvers has work to address this on mtelvers#1, which PR will to target this repo soon.

[shonfeder]

@mtelvers opened #276, which tracks work on a general solution to this problem, so I'll close this in favor of that.