✨Update golangci-lint version and modernize lint

.github/workflows/golangci-lint.yml

@@ -34,6 +34,6 @@ jobs:
       - name: golangci-lint
         uses: golangci/golangci-lint-action@0a35821d5c230e903fcfe077583637dea1b27b47 # tag=v9.0.0
         with:
-          version: v2.5.0
+          version: v2.6.1
           args: --output.text.print-linter-name=true --output.text.colors=true --timeout 10m
           working-directory: ${{matrix.working-directory}}

.golangci.yml

@@ -31,6 +31,7 @@ linters:
     - iotamixing
     - makezero
     - misspell
+    - modernize
     - nakedret
     - nilerr
     - nolintlint
@@ -75,6 +76,10 @@ linters:
         - pkg: sigs.k8s.io/controller-runtime
           alias: ctrl
       no-unaliased: true
+    modernize:
+      disable:
+        - omitzero
+        - fmtappendf
     revive:
       rules:
         # The following rules are recommended https://github.com/mgechev/revive#recommended-configuration

hack/tools/cmd/gomodcheck/main.go

@@ -162,7 +162,7 @@ func modulesFromUpstreamModGraph(upstreamRefList []string) (map[string]map[strin
 	}
 
 	modToVersionToUpstreamRef := make(map[string]map[string]string)
-	for _, line := range strings.Split(graph, "\n") {
+	for line := range strings.SplitSeq(graph, "\n") {
 		ref := strings.SplitN(line, "@", 2)[0]
 
 		if _, ok := upstreamRefs[ref]; !ok {

pkg/builder/controller.go

@@ -312,7 +312,7 @@ func (blder *TypedBuilder[request]) doWatch() error {
 			return err
 		}
 
-		if reflect.TypeFor[request]() != reflect.TypeOf(reconcile.Request{}) {
+		if reflect.TypeFor[request]() != reflect.TypeFor[reconcile.Request]() {
 			return fmt.Errorf("For() can only be used with reconcile.Request, got %T", *new(request))
 		}
 

pkg/builder/controller_test.go

@@ -61,10 +61,10 @@ func (l *testLogger) Enabled(int) bool {
 	return true
 }
 
-func (l *testLogger) Info(level int, msg string, keysAndValues ...interface{}) {
+func (l *testLogger) Info(level int, msg string, keysAndValues ...any) {
 }
 
-func (l *testLogger) WithValues(keysAndValues ...interface{}) logr.LogSink {
+func (l *testLogger) WithValues(keysAndValues ...any) logr.LogSink {
 	return l
 }
 

pkg/builder/webhook.go

@@ -39,10 +39,10 @@ import (
 // WebhookBuilder builds a Webhook.
 type WebhookBuilder[T runtime.Object] struct {
 	apiType                   runtime.Object
-	customDefaulter           admission.CustomDefaulter
+	customDefaulter           admission.CustomDefaulter //nolint:staticcheck
 	defaulter                 admission.Defaulter[T]
 	customDefaulterOpts       []admission.DefaulterOption
-	customValidator           admission.CustomValidator
+	customValidator           admission.CustomValidator //nolint:staticcheck
 	validator                 admission.Validator[T]
 	customPath                string
 	customValidatorCustomPath string
@@ -64,6 +64,7 @@ func WebhookManagedBy[T runtime.Object](m manager.Manager, object T) *WebhookBui
 
 // WithCustomDefaulter takes an admission.CustomDefaulter interface, a MutatingWebhook with the provided opts (admission.DefaulterOption)
 // will be wired for this type.
+//
 // Deprecated: Use WithDefaulter instead.
 func (blder *WebhookBuilder[T]) WithCustomDefaulter(defaulter admission.CustomDefaulter, opts ...admission.DefaulterOption) *WebhookBuilder[T] {
 	blder.customDefaulter = defaulter
@@ -79,6 +80,7 @@ func (blder *WebhookBuilder[T]) WithDefaulter(defaulter admission.Defaulter[T],
 }
 
 // WithCustomValidator takes a admission.CustomValidator interface, a ValidatingWebhook will be wired for this type.
+//
 // Deprecated: Use WithValidator instead.
 func (blder *WebhookBuilder[T]) WithCustomValidator(validator admission.CustomValidator) *WebhookBuilder[T] {
 	blder.customValidator = validator
@@ -306,6 +308,7 @@ func (blder *WebhookBuilder[T]) getValidatingWebhook() (*admission.Webhook, erro
 		}
 		w = admission.WithValidator(blder.mgr.GetScheme(), blder.validator)
 	} else if blder.customValidator != nil {
+		//nolint:staticcheck
 		w = admission.WithCustomValidator(blder.mgr.GetScheme(), blder.apiType, blder.customValidator)
 	}
 	if w != nil && blder.recoverPanic != nil {

pkg/builder/webhook_test.go

@@ -1180,6 +1180,7 @@ func (*testDefaulter) Default(ctx context.Context, obj *TestDefaulterObject) err
 	return nil
 }
 
+//nolint:staticcheck
 var _ admission.CustomDefaulter = &TestCustomDefaulter{}
 
 type TestCustomValidator struct{}
@@ -1263,6 +1264,7 @@ func (*testValidator) ValidateDelete(ctx context.Context, obj *TestValidatorObje
 	return nil, nil
 }
 
+//nolint:staticcheck
 var _ admission.CustomValidator = &TestCustomValidator{}
 
 // TestCustomDefaultValidator for default
@@ -1286,6 +1288,7 @@ func (*TestCustomDefaultValidator) Default(ctx context.Context, obj runtime.Obje
 	return nil
 }
 
+//nolint:staticcheck
 var _ admission.CustomDefaulter = &TestCustomDefaulter{}
 
 // TestCustomDefaultValidator for validation
@@ -1345,6 +1348,7 @@ func (*TestCustomDefaultValidator) ValidateDelete(ctx context.Context, obj runti
 	return nil, nil
 }
 
+//nolint:staticcheck
 var _ admission.CustomValidator = &TestCustomValidator{}
 
 type testValidatorDefaulter struct{}

pkg/cache/cache_test.go

@@ -216,7 +216,7 @@ var _ = Describe("Cache with transformers", func() {
 
 		By("creating the informer cache")
 		informerCache, err = cache.New(cfg, cache.Options{
-			DefaultTransform: func(i interface{}) (interface{}, error) {
+			DefaultTransform: func(i any) (any, error) {
 				obj := i.(runtime.Object)
 				Expect(obj).NotTo(BeNil())
 
@@ -238,7 +238,7 @@ var _ = Describe("Cache with transformers", func() {
 			},
 			ByObject: map[client.Object]cache.ByObject{
 				&corev1.Pod{}: {
-					Transform: func(i interface{}) (interface{}, error) {
+					Transform: func(i any) (any, error) {
 						obj := i.(runtime.Object)
 						Expect(obj).NotTo(BeNil())
 						accessor, err := meta.Accessor(obj)
@@ -1103,7 +1103,7 @@ func CacheTest(createCacheFunc func(config *rest.Config, opts cache.Options) (ca
 						Expect(out).To(Equal(uKnownPod2))
 
 						By("altering a field in the retrieved pod")
-						m, _ := out.Object["spec"].(map[string]interface{})
+						m, _ := out.Object["spec"].(map[string]any)
 						m["activeDeadlineSeconds"] = 4
 
 						By("verifying the pods are no longer equal")
@@ -1954,8 +1954,8 @@ func CacheTest(createCacheFunc func(config *rest.Config, opts cache.Options) (ca
 					Expect(sii.HasSynced()).To(BeTrue())
 
 					By("adding an event handler listening for object creation which sends the object to a channel")
-					out := make(chan interface{})
-					addFunc := func(obj interface{}) {
+					out := make(chan any)
+					addFunc := func(obj any) {
 						out <- obj
 					}
 					_, _ = sii.AddEventHandler(kcache.ResourceEventHandlerFuncs{AddFunc: addFunc})
@@ -2014,8 +2014,8 @@ func CacheTest(createCacheFunc func(config *rest.Config, opts cache.Options) (ca
 					Expect(sii.HasSynced()).To(BeTrue())
 
 					By("adding an event handler listening for object creation which sends the object to a channel")
-					out := make(chan interface{})
-					addFunc := func(obj interface{}) {
+					out := make(chan any)
+					addFunc := func(obj any) {
 						out <- obj
 					}
 					_, _ = sii.AddEventHandler(kcache.ResourceEventHandlerFuncs{AddFunc: addFunc})
@@ -2196,9 +2196,9 @@ func CacheTest(createCacheFunc func(config *rest.Config, opts cache.Options) (ca
 					By("getting a shared index informer for a pod")
 
 					pod := &unstructured.Unstructured{
-						Object: map[string]interface{}{
-							"spec": map[string]interface{}{
-								"containers": []map[string]interface{}{
+						Object: map[string]any{
+							"spec": map[string]any{
+								"containers": []map[string]any{
 									{
 										"name":  "nginx",
 										"image": "nginx",
@@ -2220,8 +2220,8 @@ func CacheTest(createCacheFunc func(config *rest.Config, opts cache.Options) (ca
 					Expect(sii.HasSynced()).To(BeTrue())
 
 					By("adding an event handler listening for object creation which sends the object to a channel")
-					out := make(chan interface{})
-					addFunc := func(obj interface{}) {
+					out := make(chan any)
+					addFunc := func(obj any) {
 						out <- obj
 					}
 					_, _ = sii.AddEventHandler(kcache.ResourceEventHandlerFuncs{AddFunc: addFunc})
@@ -2239,9 +2239,9 @@ func CacheTest(createCacheFunc func(config *rest.Config, opts cache.Options) (ca
 				It("should be able to stop and restart informers", func(ctx SpecContext) {
 					By("getting a shared index informer for a pod")
 					pod := &unstructured.Unstructured{
-						Object: map[string]interface{}{
-							"spec": map[string]interface{}{
-								"containers": []map[string]interface{}{
+						Object: map[string]any{
+							"spec": map[string]any{
+								"containers": []map[string]any{
 									{
 										"name":  "nginx",
 										"image": "nginx",
@@ -2294,7 +2294,7 @@ func CacheTest(createCacheFunc func(config *rest.Config, opts cache.Options) (ca
 						if !ok {
 							return []string{}
 						}
-						m, ok := s.(map[string]interface{})
+						m, ok := s.(map[string]any)
 						if !ok {
 							return []string{}
 						}
@@ -2379,8 +2379,8 @@ func CacheTest(createCacheFunc func(config *rest.Config, opts cache.Options) (ca
 					Expect(sii.HasSynced()).To(BeTrue())
 
 					By("adding an event handler listening for object creation which sends the object to a channel")
-					out := make(chan interface{})
-					addFunc := func(obj interface{}) {
+					out := make(chan any)
+					addFunc := func(obj any) {
 						out <- obj
 					}
 					_, _ = sii.AddEventHandler(kcache.ResourceEventHandlerFuncs{AddFunc: addFunc})

pkg/cache/defaulting_test.go

@@ -474,11 +474,9 @@ func TestDefaultOptsRace(t *testing.T) {
 	// Start go routines which re-use the above options struct.
 	wg := sync.WaitGroup{}
 	for range 2 {
-		wg.Add(1)
-		go func() {
+		wg.Go(func() {
 			_, _ = defaultOpts(&rest.Config{}, opts)
-			wg.Done()
-		}()
+		})
 	}
 
 	// Wait for the go routines to finish.
@@ -509,7 +507,7 @@ func TestDefaultConfigConsidersAllFields(t *testing.T) {
 		},
 	)
 
-	for i := 0; i < 100; i++ {
+	for range 100 {
 		fuzzed := Config{}
 		f.Fuzz(&fuzzed)
 

pkg/cache/delegating_by_gvk_cache.go

@@ -81,13 +81,11 @@ func (dbt *delegatingByGVKCache) Start(ctx context.Context) error {
 	errs := make(chan error)
 	for idx := range allCaches {
 		cache := allCaches[idx]
-		wg.Add(1)
-		go func() {
-			defer wg.Done()
+		wg.Go(func() {
 			if err := cache.Start(ctx); err != nil {
 				errs <- err
 			}
-		}()
+		})
 	}
 
 	select {

pkg/cache/informer_cache.go

@@ -221,7 +221,7 @@ func (ic *informerCache) IndexField(ctx context.Context, obj client.Object, fiel
 }
 
 func indexByField(informer Informer, field string, extractValue client.IndexerFunc) error {
-	indexFunc := func(objRaw interface{}) ([]string, error) {
+	indexFunc := func(objRaw any) ([]string, error) {
 		// TODO(directxman12): check if this is the correct type?
 		obj, isObj := objRaw.(client.Object)
 		if !isObj {

pkg/cache/internal/cache_reader.go

@@ -20,6 +20,7 @@ import (
 	"context"
 	"fmt"
 	"reflect"
+	"slices"
 
 	apierrors "k8s.io/apimachinery/pkg/api/errors"
 	apimeta "k8s.io/apimachinery/pkg/api/meta"
@@ -109,7 +110,7 @@ func (c *CacheReader) Get(_ context.Context, key client.ObjectKey, out client.Ob
 
 // List lists items out of the indexer and writes them to out.
 func (c *CacheReader) List(_ context.Context, out client.ObjectList, opts ...client.ListOption) error {
-	var objs []interface{}
+	var objs []any
 	var err error
 
 	listOpts := client.ListOptions{}
@@ -186,10 +187,10 @@ func (c *CacheReader) List(_ context.Context, out client.ObjectList, opts ...cli
 	return nil
 }
 
-func byIndexes(indexer cache.Indexer, requires fields.Requirements, namespace string) ([]interface{}, error) {
+func byIndexes(indexer cache.Indexer, requires fields.Requirements, namespace string) ([]any, error) {
 	var (
 		err  error
-		objs []interface{}
+		objs []any
 		vals []string
 	)
 	indexers := indexer.GetIndexers()
@@ -213,17 +214,14 @@ func byIndexes(indexer cache.Indexer, requires fields.Requirements, namespace st
 		if !exist {
 			return nil, fmt.Errorf("index with name %s does not exist", indexName)
 		}
-		filteredObjects := make([]interface{}, 0, len(objs))
+		filteredObjects := make([]any, 0, len(objs))
 		for _, obj := range objs {
 			vals, err = fn(obj)
 			if err != nil {
 				return nil, err
 			}
-			for _, val := range vals {
-				if val == indexedValue {
-					filteredObjects = append(filteredObjects, obj)
-					break
-				}
+			if slices.Contains(vals, indexedValue) {
+				filteredObjects = append(filteredObjects, obj)
 			}
 		}
 		if len(filteredObjects) == 0 {

pkg/cache/internal/informers.go

@@ -242,11 +242,9 @@ func (ip *Informers) startInformerLocked(cacheEntry *Cache) {
 		return
 	}
 
-	ip.waitGroup.Add(1)
-	go func() {
-		defer ip.waitGroup.Done()
+	ip.waitGroup.Go(func() {
 		cacheEntry.Start(ip.ctx.Done())
-	}()
+	})
 }
 
 func (ip *Informers) waitForStarted(ctx context.Context) bool {

pkg/certwatcher/certwatcher_test.go

@@ -255,7 +255,7 @@ var _ = Describe("CertWatcher", func() {
 })
 
 func writeCerts(certPath, keyPath, ip string) error {
-	var priv interface{}
+	var priv any
 	var err error
 	priv, err = rsa.GenerateKey(rand.Reader, 2048)
 	if err != nil {

pkg/client/apiutil/apimachinery.go

@@ -231,7 +231,7 @@ func (t targetZeroingDecoder) Decode(data []byte, defaults *schema.GroupVersionK
 }
 
 // zero zeros the value of a pointer.
-func zero(x interface{}) {
+func zero(x any) {
 	if x == nil {
 		return
 	}

pkg/client/apiutil/restmapper_test.go

@@ -746,7 +746,7 @@ func TestLazyRestMapperProvider(t *testing.T) {
 
 				wg := sync.WaitGroup{}
 				wg.Add(50)
-				for i := 0; i < 50; i++ {
+				for range 50 {
 					go func() {
 						defer wg.Done()
 						httpClient, err := rest.HTTPClientFor(restCfg)
@@ -811,7 +811,7 @@ type errorMatcher struct {
 	message   string
 }
 
-func (e *errorMatcher) Match(actual interface{}) (success bool, err error) {
+func (e *errorMatcher) Match(actual any) (success bool, err error) {
 	if actual == nil {
 		return false, nil
 	}
@@ -824,10 +824,10 @@ func (e *errorMatcher) Match(actual interface{}) (success bool, err error) {
 	return e.checkFunc(actualErr), nil
 }
 
-func (e *errorMatcher) FailureMessage(actual interface{}) (message string) {
+func (e *errorMatcher) FailureMessage(actual any) (message string) {
 	return format.Message(actual, fmt.Sprintf("to be %s error", e.message))
 }
 
-func (e *errorMatcher) NegatedFailureMessage(actual interface{}) (message string) {
+func (e *errorMatcher) NegatedFailureMessage(actual any) (message string) {
 	return format.Message(actual, fmt.Sprintf("not to be %s error", e.message))
 }