certs: remove always nil error from New signature

cmd/gke-certificates-controller/app/gke_certificates_controller.go

@@ -77,14 +77,11 @@ func Run(s *GKECertificatesController) error {
 		return err
 	}
 
-	controller, err := certificates.NewCertificateController(
+	controller := certificates.NewCertificateController(
 		client,
 		sharedInformers.Certificates().V1beta1().CertificateSigningRequests(),
 		signer.handle,
 	)
-	if err != nil {
-		return err
-	}
 
 	sharedInformers.Start(nil)
 	controller.Run(5, nil) // runs forever

cmd/kube-controller-manager/app/certificates.go

@@ -59,16 +59,10 @@ func startCSRApprovingController(ctx ControllerContext) (bool, error) {
 		return false, nil
 	}
 
-	approver, err := approver.NewCSRApprovingController(
+	approver := approver.NewCSRApprovingController(
 		ctx.ClientBuilder.ClientOrDie("certificate-controller"),
 		ctx.InformerFactory.Certificates().V1beta1().CertificateSigningRequests(),
 	)
-	if err != nil {
-		// TODO this is failing consistently in test-cmd and local-up-cluster.sh.  Fix them and make it consistent with all others which
-		// cause a crash loop
-		glog.Errorf("Failed to start certificate controller: %v", err)
-		return false, nil
-	}
 	go approver.Run(1, ctx.Stop)
 
 	return true, nil

pkg/controller/certificates/approver/sarapprove.go

@@ -44,7 +44,7 @@ type sarApprover struct {
 	recognizers []csrRecognizer
 }
 
-func NewCSRApprovingController(client clientset.Interface, csrInformer certificatesinformers.CertificateSigningRequestInformer) (*certificates.CertificateController, error) {
+func NewCSRApprovingController(client clientset.Interface, csrInformer certificatesinformers.CertificateSigningRequestInformer) *certificates.CertificateController {
 	approver := &sarApprover{
 		client:      client,
 		recognizers: recognizers(),

pkg/controller/certificates/certificate_controller.go

@@ -53,7 +53,7 @@ func NewCertificateController(
 	kubeClient clientset.Interface,
 	csrInformer certificatesinformers.CertificateSigningRequestInformer,
 	handler func(*certificates.CertificateSigningRequest) error,
-) (*CertificateController, error) {
+) *CertificateController {
 	// Send events to the apiserver
 	eventBroadcaster := record.NewBroadcaster()
 	eventBroadcaster.StartLogging(glog.Infof)
@@ -98,7 +98,7 @@ func NewCertificateController(
 	cc.csrLister = csrInformer.Lister()
 	cc.csrsSynced = csrInformer.Informer().HasSynced
 	cc.handler = handler
-	return cc, nil
+	return cc
 }
 
 // Run the main goroutine responsible for watching and syncing jobs.

pkg/controller/certificates/certificate_controller_test.go

@@ -54,14 +54,11 @@ func TestCertificateController(t *testing.T) {
 		return nil
 	}
 
-	controller, err := NewCertificateController(
+	controller := NewCertificateController(
 		client,
 		informerFactory.Certificates().V1beta1().CertificateSigningRequests(),
 		handler,
 	)
-	if err != nil {
-		t.Fatalf("error creating controller: %v", err)
-	}
 	controller.csrsSynced = func() bool { return true }
 
 	stopCh := make(chan struct{})

pkg/controller/certificates/signer/cfssl_signer.go

@@ -50,7 +50,7 @@ func NewCSRSigningController(
 		client,
 		csrInformer,
 		signer.handle,
-	)
+	), nil
 }
 
 type cfsslSigner struct {