cleanup some unused code and minor refactors (#1274)

Co-authored-by: Yusuke Kuoka <ykuoka@gmail.com>

controllers/constants.go

@@ -47,8 +47,6 @@ const (
 	// A pod that is timed out can be terminated if needed.
 	registrationTimeout = 10 * time.Minute
 
-	defaultRegistrationCheckInterval = time.Minute
-
 	// DefaultRunnerPodRecreationDelayAfterWebhookScale is the delay until syncing the runners with the desired replicas
 	// after a webhook-based scale up.
 	// This is used to prevent ARC from recreating completed runner pods that are deleted soon without being used at all.

controllers/horizontal_runner_autoscaler_webhook_on_push.go

@@ -15,10 +15,6 @@ func (autoscaler *HorizontalRunnerAutoscalerGitHubWebhook) MatchPushEvent(event
 
 		push := g.Push
 
-		if push == nil {
-			return false
-		}
-
-		return true
+		return push != nil
 	}
 }

controllers/runner_graceful_stop.go

@@ -134,7 +134,7 @@ func ensureRunnerUnregistration(ctx context.Context, retryDelay time.Duration, l
 			"lastState.message", lts.Message,
 			"pod.phase", pod.Status.Phase,
 		)
-	} else if ok, err := unregisterRunner(ctx, ghClient, enterprise, organization, repository, runner, *runnerID); err != nil {
+	} else if ok, err := unregisterRunner(ctx, ghClient, enterprise, organization, repository, *runnerID); err != nil {
 		if errors.Is(err, &gogithub.RateLimitError{}) {
 			// We log the underlying error when we failed calling GitHub API to list or unregisters,
 			// or the runner is still busy.
@@ -193,7 +193,7 @@ func ensureRunnerUnregistration(ctx context.Context, retryDelay time.Duration, l
 			// So we can just wait for the completion without actively retrying unregistration.
 			ephemeral := getRunnerEnv(pod, EnvVarEphemeral)
 			if ephemeral == "true" {
-				pod, err = annotatePodOnce(ctx, c, log, pod, AnnotationKeyRunnerCompletionWaitStartTimestamp, time.Now().Format(time.RFC3339))
+				_, err = annotatePodOnce(ctx, c, log, pod, AnnotationKeyRunnerCompletionWaitStartTimestamp, time.Now().Format(time.RFC3339))
 				if err != nil {
 					return &ctrl.Result{}, err
 				}
@@ -370,7 +370,7 @@ func setRunnerEnv(pod *corev1.Pod, key, value string) {
 // There isn't a single right grace period that works for everyone.
 // The longer the grace period is, the earlier a cluster resource shortage can occur due to throttoled runner pod deletions,
 // while the shorter the grace period is, the more likely you may encounter the race issue.
-func unregisterRunner(ctx context.Context, client *github.Client, enterprise, org, repo, name string, id int64) (bool, error) {
+func unregisterRunner(ctx context.Context, client *github.Client, enterprise, org, repo string, id int64) (bool, error) {
 	// For the record, historically ARC did not try to call RemoveRunner on a busy runner, but it's no longer true.
 	// The reason ARC did so was to let a runner running a job to not stop prematurely.
 	//

controllers/runnerdeployment_controller.go

@@ -421,9 +421,7 @@ func getSelector(rd *v1alpha1.RunnerDeployment) *metav1.LabelSelector {
 func newRunnerReplicaSet(rd *v1alpha1.RunnerDeployment, commonRunnerLabels []string, scheme *runtime.Scheme) (*v1alpha1.RunnerReplicaSet, error) {
 	newRSTemplate := *rd.Spec.Template.DeepCopy()
 
-	for _, l := range commonRunnerLabels {
-		newRSTemplate.Spec.Labels = append(newRSTemplate.Spec.Labels, l)
-	}
+	newRSTemplate.Spec.Labels = append(newRSTemplate.Spec.Labels, commonRunnerLabels...)
 
 	templateHash := ComputeHash(&newRSTemplate)
 

controllers/runnerset_controller.go

@@ -188,9 +188,7 @@ var LabelValuePodMutation = "true"
 func (r *RunnerSetReconciler) newStatefulSet(runnerSet *v1alpha1.RunnerSet) (*appsv1.StatefulSet, error) {
 	runnerSetWithOverrides := *runnerSet.Spec.DeepCopy()
 
-	for _, l := range r.CommonRunnerLabels {
-		runnerSetWithOverrides.Labels = append(runnerSetWithOverrides.Labels, l)
-	}
+	runnerSetWithOverrides.Labels = append(runnerSetWithOverrides.Labels, r.CommonRunnerLabels...)
 
 	template := corev1.Pod{
 		ObjectMeta: runnerSetWithOverrides.StatefulSetSpec.Template.ObjectMeta,