kubernetes
metav1.Duration doesn't parse `d`, `w`; conflicts with kubebuilder `format=duration` validation
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/apiextensions-apiserver/issues/56
Possible solutions:
- Have metav1.Duration.UnmarshalJSON use (an equivalent of) strfmt.ParseDuration instead of time.ParseDuration. Note that the former is a superset of the latter -- i.e. this is guaranteed not to reject existing working strings.
- Add a type to metav1 ("ScalaDuration"?) that uses the more lenient parser.
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