Whitelist /busybox in the debug image

[vbehar]

In the debug image, declare /busybox as a volume so that it is automatically whitelisted, because we don't want to delete it when building multi-stages images.

FYI this is required when using Jenkins, because we need to use the debug kaniko image to be able to start the container "doing nothing" (with /busybox/cat) before building (by executing /kaniko/executor directly inside the container)
See https://issues.jenkins-ci.org/browse/JENKINS-52576

[container-tools-bot]

Hi @vbehar. Thanks for your PR.

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[priyawadhwa]

Hey @vbehar, instead of hardcoding /busybox into the whitelist, which may negatively impact people trying to use that directory with the standard (non-debug) image, let's instead add

VOLUME /busybox
to the debug Dockerfile here, which should automatically add it to the whitelist for the debug image only.

[vbehar]

@priyawadhwa ok thanks, yes that's way better (and easier) that way!

[priyawadhwa]

LGTM, thanks for contributing!

[vbehar]

Thanks for your review and your good work on Kaniko !

[kumprj]

I'm still experiencing this issue in Jenkins @vbehar . Jenkins on a Kubernetes cluster, starting the kaniko container with /busybox/cat. In my pipeline I run most of my job on a linux agent, but want to swap to kaniko container for docker images. Receiving the nohup error. Any advice for how you got it working?

Trying to run even a sh 'ls' returns '/busybox/sh: nohup: not found'

edit: disregard. For anyone who sees this I had to add a withEnv(['PATH+EXTRA=path-from-kaniko-container'])