Enable intrange linter

.golangci.yml

@@ -16,6 +16,7 @@ linters:
     - errorlint   # Find code that will cause problems with Go's error wrapping scheme
     - gofmt       # Checks whether code was gofmt-ed
     - goheader    # Checks is file headers matche a given pattern
+    - intrange    # checking for loops that could use an integer range
     - revive      # Stricter drop-in replacement for golint
 
 linters-settings:

internal/testutil/fakeclient/tracker.go

@@ -56,7 +56,7 @@ func NewClientset[T any](discovery *discoveryfake.FakeDiscovery, tracker testing
 
 	// Set the fake clientset's discovery and tracker.
 	ty := reflect.TypeOf(p).Elem()
-	for i := 0; i < ty.NumField(); i++ {
+	for i := range ty.NumField() {
 		f := ty.Field(i)
 		if f.Name == "discovery" && f.Type == reflect.TypeFor[*discoveryfake.FakeDiscovery]() {
 			*(**discoveryfake.FakeDiscovery)(unsafe.Add(unsafe.Pointer(p), f.Offset)) = discovery

inttest/ap-controllerworker/controllerworker_test.go

@@ -57,7 +57,7 @@ func (s *controllerworkerSuite) SetupTest() {
 	// ipAddress := s.GetControllerIPAddress(0)
 	var joinToken string
 
-	for idx := 0; idx < s.BootlooseSuite.ControllerCount; idx++ {
+	for idx := range s.BootlooseSuite.ControllerCount {
 		nodeName, require := s.ControllerNode(idx), s.Require()
 		address := s.GetIPAddress(nodeName)
 
@@ -106,7 +106,7 @@ func (s *controllerworkerSuite) SetupTest() {
 	}
 
 	// Final sanity -- ensure all nodes see each other according to etcd
-	for idx := 0; idx < s.BootlooseSuite.ControllerCount; idx++ {
+	for idx := range s.BootlooseSuite.ControllerCount {
 		s.Require().Len(s.GetMembers(idx), s.BootlooseSuite.ControllerCount)
 	}
 }
@@ -171,7 +171,7 @@ spec:
 	kc, err := s.KubeClient(s.ControllerNode(0))
 	s.NoError(err)
 
-	for idx := 0; idx < s.BootlooseSuite.ControllerCount; idx++ {
+	for idx := range s.BootlooseSuite.ControllerCount {
 		nodeName, require := s.ControllerNode(idx), s.Require()
 		require.NoError(s.WaitForNodeReady(nodeName, kc))
 		// Wait till we see kubelet reporting the expected version.

inttest/ap-ha3x3/ha3x3_test.go

@@ -51,7 +51,7 @@ func (s *ha3x3Suite) SetupTest() {
 	ipAddress := s.GetLBAddress()
 	var joinToken string
 
-	for idx := 0; idx < s.BootlooseSuite.ControllerCount; idx++ {
+	for idx := range s.BootlooseSuite.ControllerCount {
 		s.Require().NoError(s.WaitForSSH(s.ControllerNode(idx), 2*time.Minute, 1*time.Second))
 		s.PutFile(s.ControllerNode(idx), "/tmp/k0s.yaml", fmt.Sprintf(haControllerConfig, ipAddress))
 
@@ -74,7 +74,7 @@ func (s *ha3x3Suite) SetupTest() {
 	}
 
 	// Final sanity -- ensure all nodes see each other according to etcd
-	for idx := 0; idx < s.BootlooseSuite.ControllerCount; idx++ {
+	for idx := range s.BootlooseSuite.ControllerCount {
 		s.Require().Len(s.GetMembers(idx), s.BootlooseSuite.ControllerCount)
 	}
 
@@ -88,7 +88,7 @@ func (s *ha3x3Suite) SetupTest() {
 	client, err := s.KubeClient(s.ControllerNode(0))
 	s.Require().NoError(err)
 
-	for idx := 0; idx < s.BootlooseSuite.WorkerCount; idx++ {
+	for idx := range s.BootlooseSuite.WorkerCount {
 		s.Require().NoError(s.WaitForNodeReady(s.WorkerNode(idx), client))
 	}
 }
@@ -194,7 +194,7 @@ spec:
 		s.Equal(iptablesModeBeforeUpdate, iptablesModeAfterUpdate)
 	}
 
-	for idx := 0; idx < s.ControllerCount; idx++ {
+	for idx := range s.ControllerCount {
 		node := s.ControllerNode(idx)
 		s.Run("kubelet-config_component_nonexistence/"+node, func() {
 			ssh, err := s.SSH(ctx, node)

inttest/ap-quorum/quorum_test.go

@@ -46,7 +46,7 @@ func (s *quorumSuite) SetupTest() {
 	ipAddress := s.GetControllerIPAddress(0)
 	var joinToken string
 
-	for idx := 0; idx < s.BootlooseSuite.ControllerCount; idx++ {
+	for idx := range s.BootlooseSuite.ControllerCount {
 		s.Require().NoError(s.WaitForSSH(s.ControllerNode(idx), 2*time.Minute, 1*time.Second))
 
 		s.PutFile(s.ControllerNode(idx), "/tmp/k0s.yaml", fmt.Sprintf(k0sConfigWithMultiController, ipAddress))
@@ -70,7 +70,7 @@ func (s *quorumSuite) SetupTest() {
 	}
 
 	// Final sanity -- ensure all nodes see each other according to etcd
-	for idx := 0; idx < s.BootlooseSuite.ControllerCount; idx++ {
+	for idx := range s.BootlooseSuite.ControllerCount {
 		s.Require().Len(s.GetMembers(idx), s.BootlooseSuite.ControllerCount)
 	}
 }

inttest/ap-quorumsafety/quorumsafety_test.go

@@ -46,7 +46,7 @@ func (s *quorumSafetySuite) SetupTest() {
 	ipAddress := s.GetControllerIPAddress(0)
 	var joinToken string
 
-	for idx := 0; idx < s.BootlooseSuite.ControllerCount; idx++ {
+	for idx := range s.BootlooseSuite.ControllerCount {
 		s.Require().NoError(s.WaitForSSH(s.ControllerNode(idx), 2*time.Minute, 1*time.Second))
 
 		s.PutFile(s.ControllerNode(idx), "/tmp/k0s.yaml", fmt.Sprintf(k0sConfigWithMultiController, ipAddress))
@@ -70,7 +70,7 @@ func (s *quorumSafetySuite) SetupTest() {
 	}
 
 	// Final sanity -- ensure all nodes see each other according to etcd
-	for idx := 0; idx < s.BootlooseSuite.ControllerCount; idx++ {
+	for idx := range s.BootlooseSuite.ControllerCount {
 		s.Require().Len(s.GetMembers(idx), s.BootlooseSuite.ControllerCount)
 	}
 }

inttest/ap-selector/selector_test.go

@@ -47,7 +47,7 @@ func (s *selectorSuite) SetupTest() {
 	ipAddress := s.GetLBAddress()
 	var joinToken string
 
-	for idx := 0; idx < s.BootlooseSuite.ControllerCount; idx++ {
+	for idx := range s.BootlooseSuite.ControllerCount {
 		s.Require().NoError(s.WaitForSSH(s.ControllerNode(idx), 2*time.Minute, 1*time.Second))
 
 		s.PutFile(s.ControllerNode(idx), "/tmp/k0s.yaml", fmt.Sprintf(selectorControllerConfig, ipAddress))
@@ -71,7 +71,7 @@ func (s *selectorSuite) SetupTest() {
 	}
 
 	// Final sanity -- ensure all nodes see each other according to etcd
-	for idx := 0; idx < s.BootlooseSuite.ControllerCount; idx++ {
+	for idx := range s.BootlooseSuite.ControllerCount {
 		s.Require().Len(s.GetMembers(idx), s.BootlooseSuite.ControllerCount)
 	}
 
@@ -85,7 +85,7 @@ func (s *selectorSuite) SetupTest() {
 	client, err := s.KubeClient(s.ControllerNode(0))
 	s.Require().NoError(err)
 
-	for idx := 0; idx < s.BootlooseSuite.WorkerCount; idx++ {
+	for idx := range s.BootlooseSuite.WorkerCount {
 		s.Require().NoError(s.WaitForNodeReady(s.WorkerNode(idx), client))
 	}
 }

inttest/basic/basic_test.go

@@ -108,7 +108,7 @@ func (s *BasicSuite) TestK0sGetsUp() {
 	// We need to first wait till we see pod logs, that's a signal that konnectivity tunnels are up and thus we can then connect to kubelet
 	// via the API.
 	s.Require().NoError(common.WaitForPodLogs(ctx, kc, "kube-system"))
-	for i := 0; i < s.WorkerCount; i++ {
+	for i := range s.WorkerCount {
 		node := s.WorkerNode(i)
 		s.T().Logf("checking that we can connect to kubelet metrics on %s", node)
 		s.Require().NoError(common.VerifyKubeletMetrics(ctx, kc, node))

inttest/bind-address/bind_address_test.go

@@ -47,7 +47,7 @@ func (s *suite) TestCustomizedBindAddress() {
 	ctx := s.Context()
 
 	{
-		for i := 0; i < s.ControllerCount; i++ {
+		for i := range s.ControllerCount {
 			config, err := yaml.Marshal(&v1beta1.ClusterConfig{
 				Spec: &v1beta1.ClusterSpec{
 					API: func() *v1beta1.APISpec {
@@ -89,7 +89,7 @@ func (s *suite) TestCustomizedBindAddress() {
 		s.Require().NoError(err)
 
 		eg, _ := errgroup.WithContext(ctx)
-		for i := 0; i < s.WorkerCount; i++ {
+		for i := range s.WorkerCount {
 			nodeName := s.WorkerNode(i)
 			eg.Go(func() error {
 				if err := s.WaitForNodeReady(nodeName, clients); err != nil {

inttest/common/bootloosesuite.go

@@ -232,13 +232,13 @@ func signalAwareCtx(parent context.Context) (context.Context, context.CancelCaus
 // Each node is tried in parallel for ~30secs max
 func (s *BootlooseSuite) waitForSSH(ctx context.Context) {
 	nodes := []string{}
-	for i := 0; i < s.ControllerCount; i++ {
+	for i := range s.ControllerCount {
 		nodes = append(nodes, s.ControllerNode(i))
 	}
-	for i := 0; i < s.WorkerCount; i++ {
+	for i := range s.WorkerCount {
 		nodes = append(nodes, s.WorkerNode(i))
 	}
-	for i := 0; i < s.K0smotronWorkerCount; i++ {
+	for i := range s.K0smotronWorkerCount {
 		nodes = append(nodes, s.K0smotronNode(i))
 	}
 	if s.WithLB {
@@ -606,15 +606,15 @@ listen stats
 func (s *BootlooseSuite) getControllersIPAddresses() []string {
 	upstreams := make([]string, s.ControllerCount)
 	addresses := make([]string, s.ControllerCount)
-	for i := 0; i < s.ControllerCount; i++ {
+	for i := range s.ControllerCount {
 		upstreams[i] = fmt.Sprintf("controller%d", i)
 	}
 
 	machines, err := s.InspectMachines(upstreams)
 
 	s.Require().NoError(err)
 
-	for i := 0; i < s.ControllerCount; i++ {
+	for i := range s.ControllerCount {
 		addresses[i] = machines[i].Status().IP
 	}
 	return addresses
@@ -664,7 +664,7 @@ func (s *BootlooseSuite) GetJoinToken(role string, extraArgs ...string) (string,
 
 // ImportK0smotrtonImages imports
 func (s *BootlooseSuite) ImportK0smotronImages(ctx context.Context) error {
-	for i := 0; i < s.WorkerCount; i++ {
+	for i := range s.WorkerCount {
 		workerNode := s.WorkerNode(i)
 		s.T().Logf("Importing images in %s", workerNode)
 		sshWorker, err := s.SSH(s.Context(), workerNode)
@@ -692,7 +692,7 @@ func (s *BootlooseSuite) RunWorkers(args ...string) error {
 
 // RunWorkersWithToken joins all the workers to the cluster with the given token
 func (s *BootlooseSuite) RunWorkersWithToken(token string, args ...string) error {
-	for i := 0; i < s.WorkerCount; i++ {
+	for i := range s.WorkerCount {
 		err := s.RunWithToken(s.WorkerNode(i), token, args...)
 		if err != nil {
 			return err

inttest/configchange/config_test.go

@@ -179,7 +179,7 @@ func (s *ConfigSuite) TestK0sGetsUp() {
 		s.Require().NoError(err)
 		defer configMapWatch.Stop()
 		timeout := time.After(20 * time.Second)
-		for i := 0; i < 2; i++ {
+		for range 2 {
 			select {
 			case event := <-configMapWatch.ResultChan():
 				cm := event.Object.(*corev1.ConfigMap)

inttest/cplb/cplb_test.go

@@ -55,7 +55,7 @@ func (s *keepalivedSuite) TestK0sGetsUp() {
 	ctx := s.Context()
 	var joinToken string
 
-	for idx := 0; idx < s.BootlooseSuite.ControllerCount; idx++ {
+	for idx := range s.BootlooseSuite.ControllerCount {
 		s.Require().NoError(s.WaitForSSH(s.ControllerNode(idx), 2*time.Minute, 1*time.Second))
 		s.PutFile(s.ControllerNode(idx), "/tmp/k0s.yaml", fmt.Sprintf(haControllerConfig, lb, lb))
 
@@ -72,7 +72,7 @@ func (s *keepalivedSuite) TestK0sGetsUp() {
 	}
 
 	// Final sanity -- ensure all nodes see each other according to etcd
-	for idx := 0; idx < s.BootlooseSuite.ControllerCount; idx++ {
+	for idx := range s.BootlooseSuite.ControllerCount {
 		s.Require().Len(s.GetMembers(idx), s.BootlooseSuite.ControllerCount)
 	}
 
@@ -89,21 +89,21 @@ func (s *keepalivedSuite) TestK0sGetsUp() {
 	s.Require().NoError(s.WaitForNodeReady(s.WorkerNode(0), client))
 
 	// Verify that all servers have the dummy interface
-	for idx := 0; idx < s.BootlooseSuite.ControllerCount; idx++ {
+	for idx := range s.BootlooseSuite.ControllerCount {
 		s.checkDummy(ctx, s.ControllerNode(idx), lb)
 	}
 
 	// Verify that only one controller has the VIP in eth0
 	count := 0
-	for idx := 0; idx < s.BootlooseSuite.ControllerCount; idx++ {
+	for idx := range s.BootlooseSuite.ControllerCount {
 		if s.hasVIP(ctx, s.ControllerNode(idx), lb) {
 			count++
 		}
 	}
 	s.Require().Equal(1, count, "Expected exactly one controller to have the VIP")
 
 	// Verify that the real servers are present in the ipvsadm output
-	for idx := 0; idx < s.BootlooseSuite.ControllerCount; idx++ {
+	for idx := range s.BootlooseSuite.ControllerCount {
 		s.validateRealServers(ctx, s.ControllerNode(idx), lb)
 	}
 }
@@ -136,7 +136,7 @@ func (s *keepalivedSuite) validateRealServers(ctx context.Context, node string,
 	defer ssh.Disconnect()
 
 	servers := []string{}
-	for i := 0; i < s.BootlooseSuite.ControllerCount; i++ {
+	for i := range s.BootlooseSuite.ControllerCount {
 		servers = append(servers, s.GetIPAddress(s.ControllerNode(i)))
 	}
 

inttest/dualstack/dualstack_test.go

@@ -113,7 +113,7 @@ func (s *DualstackSuite) SetupSuite() {
 	err = s.WaitForNodeReady(s.WorkerNode(1), client)
 	s.Require().NoError(err)
 
-	for i := 0; i < s.WorkerCount; i++ {
+	for i := range s.WorkerCount {
 		ssh, err := s.SSH(s.Context(), s.WorkerNode(i))
 		s.Require().NoError(err)
 		defer ssh.Disconnect()

inttest/etcdmember/etcdmember_test.go

@@ -56,7 +56,7 @@ func (s *EtcdMemberSuite) getMembers(ctx context.Context, fromControllerIdx int)
 func (s *EtcdMemberSuite) TestDeregistration() {
 	ctx := s.Context()
 	var joinToken string
-	for idx := 0; idx < s.BootlooseSuite.ControllerCount; idx++ {
+	for idx := range s.BootlooseSuite.ControllerCount {
 		s.Require().NoError(s.WaitForSSH(s.ControllerNode(idx), 2*time.Minute, 1*time.Second))
 
 		// Note that the token is intentionally empty for the first controller
@@ -72,7 +72,7 @@ func (s *EtcdMemberSuite) TestDeregistration() {
 	}
 
 	// Final sanity -- ensure all nodes see each other according to etcd
-	for idx := 0; idx < s.BootlooseSuite.ControllerCount; idx++ {
+	for idx := range s.BootlooseSuite.ControllerCount {
 		s.Require().Len(s.GetMembers(idx), s.BootlooseSuite.ControllerCount)
 	}
 	kc, err := s.KubeClient(s.ControllerNode(0))

inttest/hacontrolplane/hacontrolplane_test.go

@@ -54,7 +54,7 @@ func (s *HAControlplaneSuite) makeNodeLeave(executeOnControllerIdx int, peerAddr
 	sshCon, err := s.SSH(s.Context(), s.ControllerNode(executeOnControllerIdx))
 	s.Require().NoError(err)
 	defer sshCon.Disconnect()
-	for i := 0; i < 20; i++ {
+	for range 20 {
 		_, err := sshCon.ExecWithOutput(s.Context(), fmt.Sprintf("/usr/local/bin/k0s etcd leave --peer-address %s", peerAddress))
 		if err == nil {
 			break

inttest/kubeletcertrotate/kubeletcertrotate_test.go

@@ -64,7 +64,7 @@ func (s *kubeletCertRotateSuite) SetupTest() {
 	client, err := s.KubeClient(s.ControllerNode(0))
 	s.Require().NoError(err)
 
-	for idx := 0; idx < s.BootlooseSuite.WorkerCount; idx++ {
+	for idx := range s.BootlooseSuite.WorkerCount {
 		s.Require().NoError(s.WaitForNodeReady(s.WorkerNode(idx), client))
 	}
 
@@ -160,7 +160,7 @@ func (s *kubeletCertRotateSuite) TestApply() {
 	//
 	// Leaving this as 1 for now until the issue is fixed.
 
-	for i := 0; i < 1; i++ {
+	for i := range 1 {
 		s.T().Logf("Applying autopilot plan #%d", i)
 		s.applyPlan(fmt.Sprintf("id%d", i))
 	}

inttest/nllb/nllb_test.go

@@ -80,7 +80,7 @@ func (s *suite) TestNodeLocalLoadBalancing() {
 		})
 		s.Require().NoError(err)
 
-		for i := 0; i < s.ControllerCount; i++ {
+		for i := range s.ControllerCount {
 			s.WriteFileContent(s.ControllerNode(i), "/tmp/k0s.yaml", config)
 		}
 	}
@@ -98,7 +98,7 @@ func (s *suite) TestNodeLocalLoadBalancing() {
 		s.Require().NoError(err)
 
 		eg, _ := errgroup.WithContext(ctx)
-		for i := 0; i < s.WorkerCount; i++ {
+		for i := range s.WorkerCount {
 			nodeName := s.WorkerNode(i)
 			eg.Go(func() error {
 				if err := s.WaitForNodeReady(nodeName, clients); err != nil {
@@ -130,7 +130,7 @@ func (s *suite) TestNodeLocalLoadBalancing() {
 	})
 
 	workerNameToRestart := s.WorkerNode(0)
-	for i := 0; i < s.ControllerCount; i++ {
+	for i := range s.ControllerCount {
 		controllerName := s.ControllerNode(i)
 		s.Run(fmt.Sprintf("stop_%s_before_%s", workerNameToRestart, controllerName), func() {
 			err := s.StopWorker(workerNameToRestart)
@@ -216,7 +216,7 @@ func (s *suite) TestNodeLocalLoadBalancing() {
 func (s *suite) checkClusterReadiness(ctx context.Context, clients *kubernetes.Clientset, numControllers int, degradedControllers ...string) error {
 	eg, ctx := errgroup.WithContext(ctx)
 
-	for i := 0; i < numControllers; i++ {
+	for i := range numControllers {
 		nodeName := s.ControllerNode(i)
 		degraded := slices.Contains(degradedControllers, nodeName)
 
@@ -240,7 +240,7 @@ func (s *suite) checkClusterReadiness(ctx context.Context, clients *kubernetes.C
 		})
 	}
 
-	for i := 0; i < s.WorkerCount; i++ {
+	for i := range s.WorkerCount {
 		nodeName := s.WorkerNode(i)
 
 		eg.Go(func() error {

pkg/apis/k0s/v1beta1/cplb_test.go

@@ -130,7 +130,7 @@ func (s *CPLBSuite) TestValidateVRRPInstances() {
 				s.Require().Empty(err, "Test case %s expected no errors. Got: %v", tt.name, err)
 				s.T().Log(k.VRRPInstances)
 				s.Require().Equal(len(tt.expectedVRRPs), len(k.VRRPInstances), "Expected and actual VRRPInstances length mismatch")
-				for i := 0; i < len(tt.expectedVRRPs); i++ {
+				for i := range tt.expectedVRRPs {
 					s.Require().Equal(tt.expectedVRRPs[i].Interface, k.VRRPInstances[i].Interface, "Interface mismatch")
 					s.Require().Equal(tt.expectedVRRPs[i].VirtualRouterID, k.VRRPInstances[i].VirtualRouterID, "Virtual router ID mismatch")
 					s.Require().Equal(tt.expectedVRRPs[i].AdvertIntervalSeconds, k.VRRPInstances[i].AdvertIntervalSeconds, "Advertisement interval mismatch")