Make App diff configMapGenerator aware

[moensch]

Is your feature request related to a problem? Please describe.
We are using kustomize and configMapGenerator in a fair few places, including the automatic "hash suffix" feature.
In Argo CD in the diff, it always shows this as a "removed file" and an "added file" instead of a diff.
I understand Argo CD literally shows the right stuff (because a brand new resource is being created).

For example, I have this in my kustomization.yaml:

configMapGenerator:
- name: aws-iam-authenticator
  namespace: kube-system
  files:
    - configs/config.yaml

Whenever config.yaml changes, a resource like aws-iam-authenticator-57k69g6486 is being deleted, and a new one like aws-iam-authenticator-97t26c544m is created.

Describe the solution you'd like
It would be cool if it could somehow "understand" that this came from a configMapGenerator and show a nice side-by-side diff off the two resources (even though they have different names).

Have you thought about contributing yourself?
Yes - mostly logging to get input from others and if a solution to this is even feasible.

[alexec]

Does this help?

https://argoproj.github.io/argo-cd/user-guide/compare-options/#ignoring-resources-that-are-extraneous

[alexmt]

I think we were planning to solve the exact same issue by #1636 . @jessesuen , can you please confirm if this is right?

[alexmt]

I think @alexec is right. The compare-options: IgnoreExtraneous should keep app in sync status. And GC of old config maps is supposed to be solved by #1636

#1629 (comment)

[no-response]

This issue has been automatically closed because there has been no response to our request for more information from the original author. With only the information that is currently in the issue, we don't have enough information to take action. Please reach out if you have or find the answers we need so that we can investigate further.

[kplimack]

👍

[gaeljw]

I'm not sure the suggestions above solve the initial issue/question which (in my understanding) is more about the visual diff in ArgoCD UI.

IgnoreExtraneous flag would just ignore the old resource in the diff but still show a new resource. What we'd like is that the UI is "smarter" and display the actual diff between old resource and new resource as if it was the same resource even though technically on Kubernetes these really are 2 different resources.

[flojon]

Would be nice to have something similar to how git detects renamed files when showing diff.