Generators for kube-like API types
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k8s-publishing-bot Merge pull request #66251 from p0lyn0mial/generate_register_file
Automatic merge from submit-queue (batch tested with PRs 59030, 64666, 66251, 66485, 66813). If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>.

register.go generator for external types

**What this PR does / why we need it**: This pull brings a new generator that creates `register.go` file, initially only for the external types. The app takes only one argument `--input-dirs` and outputs `zz_generated.register.go` file in the same directory. The name of the generated file can be controlled by passing `output-file-base` flag.

See: kubernetes/kubernetes#65612

**Which issue(s) this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close the issue(s) when PR gets merged)*:
Fixes #

**Special notes for your reviewer**:

Passing https://github.com/openshift-evangelists/crd-code-generation/blob/master/pkg/apis/example.com/v1/types.go  to register-gen produces the following output:

```
/*
Copyright The Kubernetes Authors.

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/

// Code generated by ___debug_register_gen. DO NOT EDIT.

package v1

import (
        v1 "k8s.io/apimachinery/pkg/apis/meta/v1"
        "k8s.io/apimachinery/pkg/runtime"
        "k8s.io/apimachinery/pkg/runtime/schema"
)

// GroupName specifies the group name used to register the objects.
const GroupName = "example.com"

// GroupVersion specifies the group and the version used to register the objects.
var GroupVersion = v1.GroupVersion{Group: GroupName, Version: "v1"}

// SchemeGroupVersion is group version used to register these objects
// Deprecated: use GroupName instead.
var SchemeGroupVersion = schema.GroupVersion{Group: GroupName, Version: "v1"}

// Resource takes an unqualified resource and returns a Group qualified GroupResource
func Resource(resource string) schema.GroupResource {
        return SchemeGroupVersion.WithResource(resource).GroupResource()
}

var (
        // localSchemeBuilder and AddToScheme will stay in k8s.io/kubernetes.
        SchemeBuilder      runtime.SchemeBuilder
        localSchemeBuilder = &SchemeBuilder
        // Depreciated: use Install instead
        AddToScheme = localSchemeBuilder.AddToScheme
        Install     = localSchemeBuilder.AddToScheme
)

func init() {
        // We only register manually written functions here. The registration of the
        // generated functions takes place in the generated files. The separation
        // makes the code compile even when the generated files are missing.
        localSchemeBuilder.Register(addKnownTypes)
}

// Adds the list of known types to Scheme.
func addKnownTypes(scheme *runtime.Scheme) error {
        scheme.AddKnownTypes(SchemeGroupVersion,
                &Database{},
                &DatabaseList{},
        )
        // AddToGroupVersion allows the serialization of client types like ListOptions.
        v1.AddToGroupVersion(scheme, SchemeGroupVersion)
        return nil
}
```

**Release note**:

```
NONE
```

Kubernetes-commit: c06e76ce7fa5c5b45e3a53e0e84bbdaaaf325d85
Latest commit caff773 Aug 6, 2018

README.md

code-generator

Golang code-generators used to implement Kubernetes-style API types.

Purpose

These code-generators can be used

  • in the context of CustomResourceDefinition to build native, versioned clients, informers and other helpers
  • in the context of User-provider API Servers to build conversions between internal and versioned types, defaulters, protobuf codecs, internal and versioned clients and informers.

Resources

Compatibility

HEAD of this repo will match HEAD of k8s.io/apiserver, k8s.io/apimachinery, and k8s.io/client-go.

Where does it come from?

code-generator is synced from https://github.com/kubernetes/kubernetes/blob/master/staging/src/k8s.io/code-generator. Code changes are made in that location, merged into k8s.io/kubernetes and later synced here.