create official busybox variant for ARM

[Govinda-Fichtner]

While trying to get Docker integration tests running on ARM one major problem is that the current busybox image only works for x86.

Together with @StefanScherer I created a quick'n'dirty variant of the busybox image which can be found here: https://github.com/hypriot/armhf-busybox

Most of the tests seem to run with it. But we still have a couple of failing tests. This and the facts that the busybox image is crucial for the integration tests makes me think that it would be really important to have a clean port of your busybox image for ARM. And of course it should be part of the official docker-library.

How could we best achieve this? How could I help?

[hqhq]

@Govinda-Fichtner Yeah integration test demands some specific configurations for busybox image. I think you should fork https://github.com/docker-library/busybox , and have your own ubuntu/Dockerfile.builder.armhf and upstream/Dockerfile.builder.armhf.

I worked on this for arm64, but got some problems for upstream/Dockerfile.builder.aarch64, anyway @tianon seems toke over and fixed it, now we have https://hub.docker.com/r/aarch64/busybox/ (thanks @tianon , though I don't know how he built it yet, any source files we can see?).

[hqhq]

Sorry didn't check your link, you seems already did it based on the official source code. Then I think we should have architecture specific dockerfiles in https://github.com/docker-library/busybox as we have in Docker, @tianon WDYT?

[tianon]

The way I'd done it was somewhat manual, but I've finally got it fixed so that it happens automatically from the existing source here (especially thanks to the refactoring in #7); see https://github.com/tianon/jenkins-groovy/blob/master/dsl/docker-multiarch/images/busybox.groovy for the current modifications/build script (and docker-library/gcc#25 for some additional discussion of why I'd rather not commit to completely separate, explicit "multiarch" Dockerfiles just yet).

[tianon]

I'm going to close this now given the existence of https://hub.docker.com/r/armhf/busybox/, https://hub.docker.com/r/armel/busybox/, and even https://hub.docker.com/r/aarch64/busybox/. 👍