pkg/generated: add code for interacting with CRD API

Add auto-generated code for interfacing our CRD API. On top of this, a
CR controller can be implemented. This patch uses k8s/code-generator
for code generation. Run "make generate" in order to (re-)generate
everything. Path to the code-generator repository may need to be
specified:

  K8S_CODE_GENERATOR=path/to/code-generator make apigen

Code-generator version 0.20.7 was used to create this patch. Install
k8s code-generator tools and clone the repo with:

  git clone https://github.com/kubernetes/code-generator -b v0.20.7 <path/to/code-generator>
  go install k8s.io/code-generator/cmd/...(at)v0.20.7

Makefile

@@ -13,6 +13,8 @@ BASE_IMAGE_MINIMAL ?= gcr.io/distroless/base
 
 MDL ?= mdl
 
+K8S_CODE_GENERATOR ?= ../code-generator
+
 # Docker base command for working with html documentation.
 # Use host networking because 'jekyll serve' is stupid enough to use the
 # same site url than the "host" it binds to. Thus, all the links will be
@@ -104,6 +106,15 @@ generate:
 	rm -rf vendor/
 	controller-gen object crd output:crd:stdout paths=./pkg/apis/... > deployment/base/nfd-crds/nodefeaturerule-crd.yaml
 	cp deployment/base/nfd-crds/nodefeaturerule-crd.yaml deployment/helm/node-feature-discovery/manifests/
+	rm -rf sigs.k8s.io
+	$(K8S_CODE_GENERATOR)/generate-groups.sh client,informer,lister \
+	    sigs.k8s.io/node-feature-discovery/pkg/generated \
+	    sigs.k8s.io/node-feature-discovery/pkg/apis \
+	    "nfd:v1alpha1" --output-base=. \
+	    --go-header-file hack/boilerplate.go.txt
+	rm -rf pkg/generated
+	mv sigs.k8s.io/node-feature-discovery/pkg/generated pkg/
+	rm -rf sigs.k8s.io
 
 gofmt:
 	@$(GO_FMT) -w -l $$(find . -name '*.go')

pkg/apis/nfd/v1alpha1/register.go

@@ -0,0 +1,44 @@
+/*
+Copyright 2021 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.
+*/
+
+package v1alpha1
+
+import (
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"k8s.io/apimachinery/pkg/runtime"
+	"k8s.io/apimachinery/pkg/runtime/schema"
+)
+
+var (
+	// GroupVersion is group version used to register these objects
+	SchemeGroupVersion = schema.GroupVersion{Group: "nfd.k8s-sigs.io", Version: "v1alpha1"}
+
+	SchemeBuilder = runtime.NewSchemeBuilder(addKnownTypes)
+
+	AddToScheme = SchemeBuilder.AddToScheme
+)
+
+func Resource(resource string) schema.GroupResource {
+	return SchemeGroupVersion.WithResource(resource).GroupResource()
+}
+
+func addKnownTypes(scheme *runtime.Scheme) error {
+	scheme.AddKnownTypes(SchemeGroupVersion,
+		&NodeFeatureRule{},
+	)
+	metav1.AddToGroupVersion(scheme, SchemeGroupVersion)
+	return nil
+}

pkg/apis/nfd/v1alpha1/types.go

@@ -35,6 +35,8 @@ type NodeFeatureRuleList struct {
 // +kubebuilder:object:root=true
 // +kubebuilder:resource:scope=Cluster
 // +k8s:deepcopy-gen:interfaces=k8s.io/apimachinery/pkg/runtime.Object
+// +genclient
+// +genclient:nonNamespaced
 type NodeFeatureRule struct {
 	metav1.TypeMeta   `json:",inline"`
 	metav1.ObjectMeta `json:"metadata,omitempty"`