add an option for `kubectl diff` to exit 0 when differences are found

[jbouchery]

What would you like to be added:
Hi ! I would like an option in the kubectl diff command to return an exit code 0 when diff are found instead of 1.

Why is this needed:
I need this because i would like to use kubectl diff in my CI/CD and actually it fails when exiting 1.

Thank you !

[k8s-ci-robot]

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[brianpursley]

Can you just do this using shell features? like:

<your command> || true

[eddiezane]

Cheers there is a KEP for normalizing all exit codes in kubectl.

kubernetes/enhancements#2574

/close

[k8s-ci-robot]

@eddiezane: Closing this issue.

In response to this:

Cheers there is a KEP for normalizing all exit codes in kubectl.

kubernetes/enhancements#2574

/close

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[jbouchery]

Can you just do this using shell features? like:

<your command> || true

@brianpursley actually i can't because it will return true on errors (exit codes >1).

Actually, i found out that many diff tools use this strategy for exit codes : 0, 1 and <1. But eventually, if i use a diff tool that provide a command to not return 1 on differences it works (like this project : https://github.com/homeport/dyff)

export KUBECTL_EXTERNAL_DIFF="dyff between --omit-header"

@eddiezane, i'm not sure that this KEP resolves my issue, normalizing exit codes could resolve my issue to not return 1 when finding diffs?

Even if i can have my issue resolved i still think that this option could be possible.