controller-gen fails when using type URL

[Ruminateer]

I am trying to run a Kubebuilder project that uses Knative at https://github.com/PaddleFlow/ElasticServing. I got the exact same issue as #391. I am using controller-gen v0.5.0.

$ make install
/home/zzy/go/bin/controller-gen "crd:maxDescLen=0" rbac:roleName=manager-role webhook paths="./..." output:crd:artifacts:config=config/crd/bases
/usr/lib/go-1.13/src/net/url/url.go:357:2: encountered struct field "Scheme" without JSON tag in type "URL"
/usr/lib/go-1.13/src/net/url/url.go:358:2: encountered struct field "Opaque" without JSON tag in type "URL"
/usr/lib/go-1.13/src/net/url/url.go:359:2: encountered struct field "User" without JSON tag in type "URL"
/usr/lib/go-1.13/src/net/url/url.go:360:2: encountered struct field "Host" without JSON tag in type "URL"
/usr/lib/go-1.13/src/net/url/url.go:361:2: encountered struct field "Path" without JSON tag in type "URL"
/usr/lib/go-1.13/src/net/url/url.go:362:2: encountered struct field "RawPath" without JSON tag in type "URL"
/usr/lib/go-1.13/src/net/url/url.go:363:2: encountered struct field "ForceQuery" without JSON tag in type "URL"
/usr/lib/go-1.13/src/net/url/url.go:364:2: encountered struct field "RawQuery" without JSON tag in type "URL"
/usr/lib/go-1.13/src/net/url/url.go:365:2: encountered struct field "Fragment" without JSON tag in type "URL"
ElasticServing/pkg/apis/elasticserving/v1:-: conflicting types in allOf branches in schema: string vs object
Error: not all generators ran successfully
run `controller-gen crd:maxDescLen=0 rbac:roleName=manager-role webhook paths=./... output:crd:artifacts:config=config/crd/bases -w` to see all available markers, or `controller-gen crd:maxDescLen=0 rbac:roleName=manager-role webhook paths=./... output:crd:artifacts:config=config/crd/bases -h` for usage
make: *** [Makefile:43: manifests] Error 1

I am opening this issue as #391 is closed but seems unresolved. Any update or any workaround on this?

[Ruminateer]

I contacted the project author and is able to generate CRD with controller-gen@v0.3.1-0.20200528125929-5c0c6ae3b64b. Why this works with the older version but doesn't work with the newest version?

[markusthoemmes]

Somewhat related to this, not even type aliases that I tried to force to validate as a string type seem to be working. Here's a quick reproducer https://github.com/kubernetes-sigs/controller-tools/compare/master...markusthoemmes:url-repro?expand=1.

Am I holding this wrong or are we looking at a bug?

[DeanBrunt]

I'm observing the same behaviour as @markusthoemmes .
I've got a type similar to IntOrString that for validation I want checked as a string. Even when I try and force the type validation using a marker comment, it still fails with the missing json struct tag error.

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