Merge pull request #1348 from sttts/sttts-group-go-name

Automatic merge from submit-queue.

contributors/devel: document '// +groupGoName' code-generation tag

Documentation counterpart PR for kubernetes/kubernetes#54950.

Author: Kubernetes Submit Queue

contributors/devel/api_changes.md

@@ -524,7 +524,7 @@ run it several times to ensure there are no incompletely calculated fields.
 
 `client-gen` is a tool to generate clientsets for top-level API objects.
 
-`client-gen` requires the `// +genclient=true` annotation on each
+`client-gen` requires the `// +genclient` annotation on each
 exported type in both the internal `pkg/apis/<group>/types.go` as well as each
 specifically versioned `staging/src/k8s.io/api/<group>/<version>/types.go`.
 
@@ -542,21 +542,25 @@ Once you added the annotations, generate the client with
 hack/update-codegen.sh
 ```
 
+Note that you can use the optional `// +groupGoName=` to specify a CamelCase
+custom Golang identifier to de-conflict e.g. `policy.authorization.k8s.io` and
+`policy.k8s.io`. These two would both map to `Policy()` in clientsets.
+
 client-gen is flexible. See [this document](generating-clientset.md) if you need
 client-gen for non-kubernetes API.
 
 ### Generate Listers
 
 `lister-gen` is a tool to generate listers for a client. It reuses the
-`//+genclient=true` and the `// +groupName=` annotations, so you do not need to
+`//+genclient` and the `// +groupName=` annotations, so you do not need to
 specify extra annotations.
 
 Your previous run of `hack/update-codegen.sh` has invoked `lister-gen`.
 
 ### Generate Informers
 
 `informer-gen` generates the very useful Informers which watch API
-resources for changes. It reuses the `//+genclient=true` and the
+resources for changes. It reuses the `//+genclient` and the
 `//+groupName=` annotations, so you do not need to specify extra annotations.
 
 Your previous run of `hack/update-codegen.sh` has invoked `informer-gen`.

contributors/devel/generating-clientset.md

@@ -20,6 +20,11 @@ In some cases you want to generate non-standard verbs (eg. for sub-resources). T
 
 - `// +genclient:method=Scale,verb=update,subresource=scale,input=k8s.io/api/extensions/v1beta1.Scale,result=k8s.io/api/extensions/v1beta1.Scale` - in this case a new function `Scale(string, *v1beta.Scale) *v1beta.Scale` will be added to the default client and the body of the function will be based on the *update* verb. The optional *subresource* argument will make the generated client function use subresource `scale`. Using the optional *input* and *result* arguments you can override the default type with a custom type. If the import path is not given, the generator will assume the type exists in the same package.
 
+In addition, the following optional tags influence the client generation:
+
+- `// +groupName=policy.authorization.k8s.io` – used in the fake client as the full group name (defaults to the package name),
+- `// +groupGoName=AuthorizationPolicy` – a CamelCase Golang identifier to de-conflict groups with non-unique prefixes like `policy.authorization.k8s.io` and `policy.k8s.io`. These would lead to two `Policy()` methods in the clientset otherwise (defaults to the upper-case first segement of the group name).
+
 **2a.** If you are developing in the k8s.io/kubernetes repository, you just need to run hack/update-codegen.sh.
 
 **2b.** If you are running client-gen outside of k8s.io/kubernetes, you need to use the command line argument `--input` to specify the groups and versions of the APIs you want to generate clients for, client-gen will then look into `pkg/apis/${GROUP}/${VERSION}/types.go` and generate clients for the types you have marked with the `genclient` tags. For example, to generated a clientset named "my_release" including clients for api/v1 objects and extensions/v1beta1 objects, you need to run: