`format=duration` kubebuilder validation accepts `d`, `w`; metav1.Duration does not

[2uasimojo]

Despite validation of type=duration being documented as parsed by time.ParseDuration, which is what the unmarshaller does, it is actually parsed by strfmt.ParseDuration, which is more lenient in that it accepts d (days) and w (weeks).

The result is that the round trip is broken: go type => CRD => CR with d or w => apiserver validation (accepts d/w) => etcd => GET => unmarshal (blows up on d/w) => go type.

Example of such a CRD struct field definition.

And a BZ that uncovered the problem.

cf. https://github.com/kubernetes/apimachinery/issues/131

---

Unfortunately, any solution that makes format=duration validation stricter could break backward compatibility for use cases that don't ultimately use go's time.ParseDuration.

A possibility would be adding a separate validator (format=strictduration?) that does strictly use time.ParseDuration as advertised. Long term, perhaps it would be appropriate to clone format=duration to format=scaladuration and eventually deprecate/remove the former.

---

Workaround (suggested by @JoelSpeed): Ditch format=duration and use an explicit regex instead. That would be a pity :(

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[JoelSpeed]

/remove-lifecycle stale

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/close not-planned

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@k8s-triage-robot: Closing this issue, marking it as "Not Planned".

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/close not-planned

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