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🐛: Fake client - handle the subresource client calls too#3444

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fedepaol wants to merge 2 commits intokubernetes-sigs:mainfrom
fedepaol:fixfakeclient
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🐛: Fake client - handle the subresource client calls too#3444
fedepaol wants to merge 2 commits intokubernetes-sigs:mainfrom
fedepaol:fixfakeclient

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@fedepaol
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Regressed when bumping controller runtime in metallb, getting:

Operation cannot be fulfilled on xxx: object was modified

when validating cl.Status().Patch() calls.

Also, when trying to debug and to understand why the local tests weren't failing I found an odd behavior in versioned_tracker.go fixed by the first commit.

Hope this helps, thanks for the project!

toMapString / fromMapString are used in copy.
Returning the unstructured pointer is dangerous, as the calling site
expects the returned object to be a new one, and to be free to modify it.
With the old implementation changing a value on the copy had the side
effect of changing the value in the original implementation, for example
in
https://github.com/kubernetes-sigs/controller-runtime/blob/83b689cd942b7b68a44eeb91f7a9cc114aa59aff/pkg/client/fake/versioned_tracker.go#L243

it had the effect to modify the resource version of the old object too.

Signed-off-by: Federico Paolinelli <fpaoline@redhat.com>
Assisted-by: Claude <noreply@anthropic.com>
The stack when calling client.Status().Update contains

"sigs.k8s.io/controller-runtime/pkg/client/fake.(*fakeSubResourceClient).Update" and
not
"sigs.k8s.io/controller-runtime/pkg/client/fake.(*fakeClient).Update".
Here we add a new test (failing without the patch) and the fix.

Signed-off-by: Federico Paolinelli <fpaoline@redhat.com>
Assisted-by: Claude <noreply@anthropic.com>
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[APPROVALNOTIFIER] This PR is NOT APPROVED

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@k8s-ci-robot k8s-ci-robot added the needs-ok-to-test Indicates a PR that requires an org member to verify it is safe to test. label Jan 29, 2026
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Hi @fedepaol. Thanks for your PR.

I'm waiting for a kubernetes-sigs member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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@k8s-ci-robot k8s-ci-robot added size/M Denotes a PR that changes 30-99 lines, ignoring generated files. cncf-cla: yes Indicates the PR's author has signed the CNCF CLA. labels Jan 29, 2026
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closing in favor of #3443

@alvaroaleman maybe makes sense to keep c30a9f8 ?

@fedepaol fedepaol closed this Jan 29, 2026
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