reference values from overlay subsets

[Nizar-opt]

Describe the problem/challenge you have
I'm trying to set a label on multiple resources but with a dynamic value that includes the resource name.

#@ load("@ytt:overlay", "overlay")

#@overlay/match expects="0+", by=overlay.subset({"kind": "Deployment"})
---
metadata:
 #@overlay/match missing_ok=True
 labels:
  #@overlay/match missing_ok=True
  foo: <deployment.metadata.name>-bar #! <---------- dynamically set metadata.name of the same matching resource

Describe the solution you'd like
I want to be able to reference a value from overlay subsets.

Anything else you would like to add:

---

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[mamachanko]

@Nizar-opt If I have not misunderstood the scenario, you should be able to achieve the desired outcome with @overlays/replace. It does require you to do careful merging of resources, but it's possible. I created an example in the playground for you which updates deployments with a label referencing .metadata.name.

[Nizar-opt]

Thank you @mamachanko appreciate the example. It worked for my case. Not sure if this is considered an alternative solution? As the proposed feature may cover other cases? cc @cppforlife

[100mik]

This is not something we will get to soon. However, let's keep this issue open so that others can chime in if an alternative solution is desired 🙌🏼