adding support for scaffolding a componentconfig type

Signed-off-by: Chris Hein <me@chrishein.com>

pkg/model/file/funcmap.go

@@ -17,6 +17,8 @@ limitations under the License.
 package file
 
 import (
+	"fmt"
+	"hash/fnv"
 	"strings"
 	"text/template"
 )
@@ -26,5 +28,14 @@ func DefaultFuncMap() template.FuncMap {
 	return template.FuncMap{
 		"title": strings.Title,
 		"lower": strings.ToLower,
+		"hash":  hash,
 	}
 }
+
+func hash(s string) (string, error) {
+	hasher := fnv.New32a()
+	if _, err := hasher.Write([]byte(s)); err != nil {
+		return "", err
+	}
+	return fmt.Sprintf("%x", hasher.Sum(nil)), nil
+}

pkg/plugin/v2/scaffolds/internal/templates/main.go

@@ -18,17 +18,14 @@ package templates
 
 import (
 	"fmt"
-	"hash/fnv"
 	"path/filepath"
-	"text/template"
 
 	"sigs.k8s.io/kubebuilder/pkg/model/file"
 )
 
 const defaultMainPath = "main.go"
 
 var _ file.Template = &Main{}
-var _ file.UseCustomFuncMap = &Main{}
 
 // Main scaffolds the controller manager entry point
 type Main struct {
@@ -53,21 +50,6 @@ func (f *Main) SetTemplateDefaults() error {
 	return nil
 }
 
-func hash(s string) (string, error) {
-	hasher := fnv.New32a()
-	if _, err := hasher.Write([]byte(s)); err != nil {
-		return "", err
-	}
-	return fmt.Sprintf("%x", hasher.Sum(nil)), nil
-}
-
-// GetFuncMap implements file.UseCustomFuncMap
-func (f *Main) GetFuncMap() template.FuncMap {
-	fm := file.DefaultFuncMap()
-	fm["hash"] = hash
-	return fm
-}
-
 var _ file.Inserter = &MainUpdater{}
 
 // MainUpdater updates main.go to run Controllers
@@ -236,13 +218,13 @@ func main() {
 		"Enabling this will ensure there is only one active controller manager.")
 	flag.Parse()
 
-	ctrl.SetLogger(zap.New(zap.UseDevMode(true))) 
+	ctrl.SetLogger(zap.New(zap.UseDevMode(true)))
 
 	mgr, err := ctrl.NewManager(ctrl.GetConfigOrDie(), ctrl.Options{
 		Scheme:             scheme,
 		MetricsBindAddress: metricsAddr,
-		Port:               9443, 
-		LeaderElection:     enableLeaderElection, 
+		Port:               9443,
+		LeaderElection:     enableLeaderElection,
 		LeaderElectionID:   "{{ hash .Repo }}.{{ .Domain }}",
 	})
 	if err != nil {

pkg/plugin/v3/init.go

@@ -40,8 +40,9 @@ type initPlugin struct {
 	commandName string
 
 	// boilerplate options
-	license string
-	owner   string
+	license         string
+	owner           string
+	componentConfig bool
 
 	// flags
 	fetchDeps          bool
@@ -87,6 +88,8 @@ func (p *initPlugin) BindFlags(fs *pflag.FlagSet) {
 	fs.StringVar(&p.license, "license", "apache2",
 		"license to use to boilerplate, may be one of 'apache2', 'none'")
 	fs.StringVar(&p.owner, "owner", "", "owner to add to the copyright")
+	fs.BoolVar(&p.componentConfig, "component-config", false,
+		"component config name, may be 'true' or 'false'")
 
 	// project args
 	fs.StringVar(&p.config.Repo, "repo", "", "name to use for go module (e.g., github.com/user/repo), "+
@@ -142,7 +145,7 @@ func (p *initPlugin) Validate() error {
 }
 
 func (p *initPlugin) GetScaffolder() (scaffold.Scaffolder, error) {
-	return scaffolds.NewInitScaffolder(p.config, p.license, p.owner), nil
+	return scaffolds.NewInitScaffolder(p.config, p.license, p.owner, p.componentConfig), nil
 }
 
 func (p *initPlugin) PostScaffold() error {

pkg/plugin/v3/scaffolds/init.go

@@ -37,7 +37,7 @@ import (
 
 const (
 	// ControllerRuntimeVersion is the kubernetes-sigs/controller-runtime version to be used in the project
-	ControllerRuntimeVersion = "v0.6.3"
+	ControllerRuntimeVersion = "v0.7.0-alpha.6"
 	// ControllerToolsVersion is the kubernetes-sigs/controller-tools version to be used in the project
 	ControllerToolsVersion = "v0.3.0"
 	// KustomizeVersion is the kubernetes-sigs/kustomize version to be used in the project
@@ -53,15 +53,17 @@ type initScaffolder struct {
 	boilerplatePath string
 	license         string
 	owner           string
+	componentConfig bool
 }
 
 // NewInitScaffolder returns a new Scaffolder for project initialization operations
-func NewInitScaffolder(config *config.Config, license, owner string) scaffold.Scaffolder {
+func NewInitScaffolder(config *config.Config, license, owner string, componentConfig bool) scaffold.Scaffolder {
 	return &initScaffolder{
 		config:          config,
 		boilerplatePath: filepath.Join("hack", "boilerplate.go.txt"),
 		license:         license,
 		owner:           owner,
+		componentConfig: componentConfig,
 	}
 }
 
@@ -101,11 +103,18 @@ func (s *initScaffolder) scaffold() error {
 		&templates.GitIgnore{},
 		&rbac.AuthProxyRole{},
 		&rbac.AuthProxyRoleBinding{},
-		&kdefault.AuthProxyPatch{},
+		&kdefault.AuthProxyPatch{
+			ComponentConfig: s.componentConfig,
+		},
 		&rbac.AuthProxyService{},
 		&rbac.ClientClusterRole{},
-		&manager.Config{Image: imageName},
-		&templates.Main{},
+		&manager.Config{
+			Image:           imageName,
+			ComponentConfig: s.componentConfig,
+		},
+		&templates.Main{
+			ComponentConfig: s.componentConfig,
+		},
 		&templates.GoMod{ControllerRuntimeVersion: ControllerRuntimeVersion},
 		&templates.Makefile{
 			Image:                    imageName,
@@ -118,11 +127,13 @@ func (s *initScaffolder) scaffold() error {
 		&templates.DockerignoreFile{},
 		&kdefault.Kustomize{},
 		&kdefault.ManagerWebhookPatch{},
+		&kdefault.ManagerConfigPatch{},
 		&rbac.ManagerRoleBinding{},
 		&rbac.LeaderElectionRole{},
 		&rbac.LeaderElectionRoleBinding{},
 		&rbac.KustomizeRBAC{},
 		&manager.Kustomization{},
+		&manager.ComponentConfig{},
 		&webhook.Kustomization{},
 		&webhook.KustomizeConfigWebhook{},
 		&webhook.Service{},

pkg/plugin/v3/scaffolds/internal/templates/config/kdefault/auth_proxy_patch.go

@@ -17,6 +17,7 @@ limitations under the License.
 package kdefault
 
 import (
+	"fmt"
 	"path/filepath"
 
 	"sigs.k8s.io/kubebuilder/pkg/model/file"
@@ -28,6 +29,9 @@ var _ file.Template = &AuthProxyPatch{}
 // prometheus metrics for manager Pod.
 type AuthProxyPatch struct {
 	file.TemplateMixin
+
+	// ComponentConfig defines that this should be configured with a file
+	ComponentConfig bool
 }
 
 // SetTemplateDefaults implements input.Template
@@ -36,14 +40,25 @@ func (f *AuthProxyPatch) SetTemplateDefaults() error {
 		f.Path = filepath.Join("config", "default", "manager_auth_proxy_patch.yaml")
 	}
 
-	f.TemplateBody = kustomizeAuthProxyPatchTemplate
+	args := argsFragment
+	if f.ComponentConfig {
+		args = ""
+	}
+
+	f.TemplateBody = fmt.Sprintf(kustomizeAuthProxyPatchTemplate, args)
 
 	f.IfExistsAction = file.Error
 
 	return nil
 }
 
-const kustomizeAuthProxyPatchTemplate = `# This patch inject a sidecar container which is a HTTP proxy for the 
+const argsFragment = `- name: manager
+        args:
+        - "--metrics-addr=127.0.0.1:8080"
+        - "--enable-leader-election"
+`
+
+const kustomizeAuthProxyPatchTemplate = `# This patch inject a sidecar container which is a HTTP proxy for the
 # controller manager, it performs RBAC authorization against the Kubernetes API using SubjectAccessReviews.
 apiVersion: apps/v1
 kind: Deployment
@@ -64,8 +79,5 @@ spec:
         ports:
         - containerPort: 8443
           name: https
-      - name: manager
-        args:
-        - "--metrics-addr=127.0.0.1:8080"
-        - "--enable-leader-election"
+      %s
 `

pkg/plugin/v3/scaffolds/internal/templates/config/kdefault/config_manager_patch.go

@@ -0,0 +1,61 @@
+/*
+Copyright 2020 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 kdefault
+
+import (
+	"path/filepath"
+
+	"sigs.k8s.io/kubebuilder/pkg/model/file"
+)
+
+var _ file.Template = &ManagerConfigPatch{}
+
+// ManagerConfigPatch scaffolds a ManagerConfigPatch for a Resource
+type ManagerConfigPatch struct {
+	file.TemplateMixin
+}
+
+// SetTemplateDefaults implements input.Template
+func (f *ManagerConfigPatch) SetTemplateDefaults() error {
+	if f.Path == "" {
+		f.Path = filepath.Join("config", "default", "manager_config_patch.yaml")
+	}
+
+	f.TemplateBody = managerConfigPatchTemplate
+
+	return nil
+}
+
+const managerConfigPatchTemplate = `apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: controller-manager
+  namespace: system
+spec:
+  template:
+    spec:
+      containers:
+      - name: manager
+        volumeMounts:
+        - name: config
+          mountPath: /config.yaml
+          subPath: config.yaml
+      volumes:
+      - name: config
+        configMap:
+          name: controller-config
+`

pkg/plugin/v3/scaffolds/internal/templates/config/kdefault/kustomize.go

@@ -70,11 +70,15 @@ bases:
 #- ../prometheus
 
 patchesStrategicMerge:
-  # Protect the /metrics endpoint by putting it behind auth.
-  # If you want your controller-manager to expose the /metrics
-  # endpoint w/o any authn/z, please comment the following line.
+# Protect the /metrics endpoint by putting it behind auth.
+# If you want your controller-manager to expose the /metrics
+# endpoint w/o any authn/z, please comment the following line.
 - manager_auth_proxy_patch.yaml
 
+# Mount the controller config file for loading manager configurations
+# through a ComponentConfig type
+- manager_config_patch.yaml
+
 # [WEBHOOK] To enable webhook, uncomment all the sections with [WEBHOOK] prefix including the one in
 # crd/kustomization.yaml
 #- manager_webhook_patch.yaml

pkg/plugin/v3/scaffolds/internal/templates/config/manager/componentconfig.go

@@ -0,0 +1,57 @@
+/*
+Copyright 2020 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 manager
+
+import (
+	"path/filepath"
+
+	"sigs.k8s.io/kubebuilder/pkg/model/file"
+)
+
+var _ file.Template = &ComponentConfig{}
+
+// ComponentConfig scaffolds the ComponentConfig file in manager folder.
+type ComponentConfig struct {
+	file.TemplateMixin
+	file.DomainMixin
+	file.RepositoryMixin
+}
+
+// SetTemplateDefaults implements input.Template
+func (f *ComponentConfig) SetTemplateDefaults() error {
+	if f.Path == "" {
+		f.Path = filepath.Join("config", "manager", "config.yaml")
+	}
+
+	f.TemplateBody = componentConfigTemplate
+
+	f.IfExistsAction = file.Error
+
+	return nil
+}
+
+const componentConfigTemplate = `apiVersion: controller-runtime.sigs.k8s.io/v1alpha1
+kind: ControllerManagerConfiguration
+metrics:
+  bindAddress: :8080
+webhook:
+  port: 9443
+leaderElection:
+  leaderElect: true
+  resourceLock: configmaps
+  resourceName: {{ hash .Repo }}.{{ .Domain }}",
+`