🐛 Clean code & prep for CI enable (#7)

* add bin dir to git
* lint and prow fix

.gitignore

@@ -3,4 +3,4 @@
 .vscode
 vendor
 hack/tools/*
-bin/*
+bin/gcp

.prow.yaml

@@ -1,8 +1,8 @@
 presubmits:
-  - name: pull-kcp-verify
+  - name: pull-gcp-verify
     always_run: true
     decorate: true
-    clone_uri: "https://github.com/kcp-dev/kcp"
+    clone_uri: "https://github.com/kcp-dev/generic-controlplane"
     labels:
       preset-goproxy: "true"
     spec:
@@ -11,8 +11,6 @@ presubmits:
           command:
             - make
             - verify-boilerplate
-            - verify-modules
-            - verify-k8s-deps
             - verify-imports
           resources:
             requests:
@@ -22,7 +20,7 @@ presubmits:
   - name: pull-gco-lint
     always_run: true
     decorate: true
-    clone_uri: "https://github.com/kcp-dev/kcp"
+    clone_uri: "https://github.com/kcp-dev/generic-controlplane"
     labels:
       preset-goproxy: "true"
     spec:
@@ -49,7 +47,7 @@ presubmits:
             - hack/build-image.sh
           env:
             - name: DRY_RUN
-              value: '1'
+              value: "1"
           # docker-in-docker needs privileged mode
           securityContext:
             privileged: true
@@ -72,9 +70,8 @@ presubmits:
             - test
           env:
             - name: USE_GOTESTSUM
-              value: '1'
+              value: "1"
           resources:
             requests:
               memory: 4Gi
               cpu: 2
-

server/admission/plugins.go

@@ -45,7 +45,7 @@ var AllOrderedPlugins = []string{
 	autoprovision.PluginName, // NamespaceAutoProvision
 	lifecycle.PluginName,     // NamespaceLifecycle
 	exists.PluginName,        // NamespaceExists
-	//limitranger.PluginName,            // LimitRanger
+	// limitranger.PluginName,            // LimitRanger
 	serviceaccount.PluginName,         // ServiceAccount
 	eventratelimit.PluginName,         // EventRateLimit
 	gc.PluginName,                     // OwnerReferencesPermissionEnforcement
@@ -70,7 +70,7 @@ func RegisterAllAdmissionPlugins(plugins *admission.Plugins) {
 	autoprovision.Register(plugins)
 	lifecycle.Register(plugins)
 	exists.Register(plugins)
-	//limitranger.Register(plugins)
+	// limitranger.Register(plugins)
 	serviceaccount.Register(plugins)
 	eventratelimit.Register(plugins)
 	gc.Register(plugins)
@@ -89,7 +89,7 @@ func RegisterAllAdmissionPlugins(plugins *admission.Plugins) {
 func DefaultOffAdmissionPlugins() sets.Set[string] {
 	defaultOnPlugins := sets.New(
 		lifecycle.PluginName, // NamespaceLifecycle
-		//limitranger.PluginName,               // LimitRanger
+		// limitranger.PluginName,               // LimitRanger
 		serviceaccount.PluginName,            // ServiceAccount
 		defaulttolerationseconds.PluginName,  // DefaultTolerationSeconds
 		mutatingwebhook.PluginName,           // MutatingAdmissionWebhook

server/cmd/options/authentication.go

@@ -41,20 +41,24 @@ const (
 	gcpUserUserName = "user"
 )
 
+// AdminAuthentication holds the configuration for the admin authentication in standalone mode.
 type AdminAuthentication struct {
 	KubeConfigPath string
 
 	// TODO: move into Secret in-cluster, maybe by using an "in-cluster" string as value
 	ShardAdminTokenHashFilePath string
 }
 
+// NewAdminAuthentication returns a new AdminAuthentication for the given root directory
+// where the kubeconfig and the token hash file should be written.
 func NewAdminAuthentication(rootDir string) *AdminAuthentication {
 	return &AdminAuthentication{
 		KubeConfigPath:              filepath.Join(rootDir, "admin.kubeconfig"),
 		ShardAdminTokenHashFilePath: filepath.Join(rootDir, ".admin-token-store"),
 	}
 }
 
+// Validate validates the admin authentication configuration.
 func (s *AdminAuthentication) Validate() []error {
 	if s == nil {
 		return nil
@@ -69,6 +73,7 @@ func (s *AdminAuthentication) Validate() []error {
 	return errs
 }
 
+// AddFlags adds the flags for the admin authentication to the given FlagSet.
 func (s *AdminAuthentication) AddFlags(fs *pflag.FlagSet) {
 	if s == nil {
 		return
@@ -118,6 +123,7 @@ func (s *AdminAuthentication) ApplyTo(config *genericapiserver.Config) (volatile
 	return volatileGcpAdminToken, volatileUserToken, nil
 }
 
+// WriteKubeConfig writes the kubeconfig to the configured path.
 func (s *AdminAuthentication) WriteKubeConfig(config genericapiserver.CompletedConfig, gcpAdminToken, userToken string) error {
 	externalCACert, _ := config.SecureServing.Cert.CurrentCertKeyContent()
 	externalKubeConfigHost := fmt.Sprintf("https://%s", config.ExternalAddress)

server/cmd/options/config.go

@@ -30,6 +30,7 @@ import (
 	generatedopenapi "k8s.io/kubernetes/pkg/generated/openapi"
 )
 
+// Config holds the configuration for the generic controlplane server.
 type Config struct {
 	Options CompletedOptions
 
@@ -41,6 +42,7 @@ type Config struct {
 	ExtraConfig
 }
 
+// ExtraConfig holds the extra configuration for the generic controlplane server.
 type ExtraConfig struct {
 	// authentication
 	GcpAdminToken, UserToken string
@@ -58,11 +60,13 @@ type completedConfig struct {
 	ExtraConfig
 }
 
+// CompletedConfig holds the completed configuration for the generic controlplane server.
 type CompletedConfig struct {
 	// Embed a private pointer that cannot be instantiated outside of this package.
 	*completedConfig
 }
 
+// Complete fills in any fields not set that are required to have valid data.
 func (c *Config) Complete() (CompletedConfig, error) {
 	return CompletedConfig{&completedConfig{
 		Options: c.Options,

server/cmd/options/options.go

@@ -36,6 +36,7 @@ import (
 	gcpadmission "github.com/kcp-dev/generic-controlplane/server/admission"
 )
 
+// Options holds the configuration for the generic controlplane server.
 type Options struct {
 	GenericControlPlane controlplaneapiserveroptions.Options
 	EmbeddedEtcd        etcdoptions.Options
@@ -45,6 +46,7 @@ type Options struct {
 	Extra ExtraOptions
 }
 
+// ExtraOptions holds the extra configuration for the generic controlplane server.
 type ExtraOptions struct {
 	RootDir string
 }
@@ -58,6 +60,7 @@ type completedOptions struct {
 	Extra ExtraOptions
 }
 
+// CompletedOptions holds the completed configuration for the generic controlplane server.
 type CompletedOptions struct {
 	*completedOptions
 }
@@ -99,6 +102,7 @@ func NewOptions(rootDir string) *Options {
 	return o
 }
 
+// AddFlags adds flags for a specific APIServer to the specified FlagSet.
 func (o *Options) AddFlags(fss *cliflag.NamedFlagSets) {
 	o.GenericControlPlane.AddFlags(fss)
 
@@ -112,6 +116,7 @@ func (o *Options) AddFlags(fss *cliflag.NamedFlagSets) {
 	// Placeholders for future flags.
 }
 
+// Complete fills in any fields not set that are required to have valid data.
 func (o *Options) Complete() (*CompletedOptions, error) {
 	if servers := o.GenericControlPlane.Etcd.StorageConfig.Transport.ServerList; len(servers) == 1 && servers[0] == "embedded" {
 		klog.Background().Info("enabling embedded etcd server")
@@ -149,7 +154,6 @@ func (o *Options) Complete() (*CompletedOptions, error) {
 	}
 
 	// override set of admission plugins
-	//spew.Dump(o.GenericControlPlane.Admission.GenericAdmission.Plugins)
 	gcpadmission.RegisterAllAdmissionPlugins(o.GenericControlPlane.Admission.GenericAdmission.Plugins)
 	o.GenericControlPlane.Admission.GenericAdmission.DisablePlugins = sets.List[string](gcpadmission.DefaultOffAdmissionPlugins())
 	o.GenericControlPlane.Admission.GenericAdmission.RecommendedPluginOrder = gcpadmission.AllOrderedPlugins
@@ -197,6 +201,7 @@ func (o *Options) Complete() (*CompletedOptions, error) {
 	}, nil
 }
 
+// Validate validates the generic controlplane server options.
 func (o *CompletedOptions) Validate() []error {
 	var errs []error
 

server/cmd/server.go

@@ -28,9 +28,9 @@ import (
 	"github.com/spf13/cobra"
 
 	apiextensionsv1 "k8s.io/apiextensions-apiserver/pkg/apis/apiextensions/v1"
-	utilerrors "k8s.io/apimachinery/pkg/util/errors"
+	kerrors "k8s.io/apimachinery/pkg/util/errors"
 	utilruntime "k8s.io/apimachinery/pkg/util/runtime"
-	_ "k8s.io/apiserver/pkg/admission"
+	_ "k8s.io/apiserver/pkg/admission" // for admission plugins
 	genericapifilters "k8s.io/apiserver/pkg/endpoints/filters"
 	genericapiserver "k8s.io/apiserver/pkg/server"
 	utilfeature "k8s.io/apiserver/pkg/util/feature"
@@ -41,14 +41,14 @@ import (
 	"k8s.io/component-base/cli/globalflag"
 	"k8s.io/component-base/logs"
 	logsapi "k8s.io/component-base/logs/api/v1"
-	_ "k8s.io/component-base/metrics/prometheus/workqueue"
+	_ "k8s.io/component-base/metrics/prometheus/workqueue" // for workqueue metrics
 	"k8s.io/component-base/term"
 	"k8s.io/component-base/version"
 	"k8s.io/component-base/version/verflag"
 	"k8s.io/klog/v2"
 	aggregatorapiserver "k8s.io/kube-aggregator/pkg/apiserver"
 	controlplaneapiserver "k8s.io/kubernetes/pkg/controlplane/apiserver"
-	_ "k8s.io/kubernetes/pkg/features"
+	_ "k8s.io/kubernetes/pkg/features" // add the kubernetes feature gates
 
 	options "github.com/kcp-dev/generic-controlplane/server/cmd/options"
 	// add the kubernetes feature gates
@@ -108,7 +108,7 @@ APIs.`,
 			}
 
 			if errs := completedOptions.Validate(); len(errs) != 0 {
-				return utilerrors.NewAggregate(errs)
+				return kerrors.NewAggregate(errs)
 			}
 
 			// add feature enablement metrics