staticcheck fixes and updates

Errors being fixed or ignored:

```
Errors from staticcheck:
cmd/kops/create_cluster.go:740:37: possible nil pointer dereference (SA5011)
cmd/kops/create_cluster.go:736:7: this check suggests that the pointer can be nil
cmd/kops/create_cluster.go:828:30: possible nil pointer dereference (SA5011)
cmd/kops/create_cluster.go:825:7: this check suggests that the pointer can be nil
dns-controller/pkg/dns/dnscontroller.go:585:5: this value of existing is never used (SA4006)
nodeup/pkg/model/kubelet_test.go:67:23: possible nil pointer dereference (SA5011)
nodeup/pkg/model/kubelet_test.go:63:5: this check suggests that the pointer can be nil
pkg/apis/kops/validation/legacy.go:138:97: unnecessary use of fmt.Sprintf (S1039)
pkg/apis/kops/validation/legacy.go:150:112: unnecessary use of fmt.Sprintf (S1039)
upup/pkg/fi/nodeup/nodetasks/update_packages.go:48:9: unnecessary use of fmt.Sprintf (S1039)

cmd/kops-controller/controllers/node_controller.go:89:1: comment on exported method Reconcile should be of the form "Reconcile ..." (ST1020)
dnsprovider/pkg/dnsprovider/dns.go:102:1: comment on exported function ResourceRecordSetsEquivalent should be of the form "ResourceRecordSetsEquivalent ..." (ST1020)
dnsprovider/pkg/dnsprovider/plugins.go:65:1: comment on exported function RegisteredDnsProviders should be of the form "RegisteredDnsProviders ..." (ST1020)
dnsprovider/pkg/dnsprovider/providers/aws/route53/stubs/route53api.go:30:1: comment on exported type Route53API should be of the form "Route53API ..." (with optional leading article) (ST1021)
dnsprovider/pkg/dnsprovider/providers/google/clouddns/internal/stubs/clouddns.go:26:2: comment on exported type Project should be of the form "Project ..." (with optional leading article) (ST1021)
dnsprovider/pkg/dnsprovider/tests/commontests.go:28:1: comment on exported function CommonTestResourceRecordSetsReplace should be of the form "CommonTestResourceRecordSetsReplace ..." (ST1020)
dnsprovider/pkg/dnsprovider/tests/commontests.go:52:1: comment on exported function CommonTestResourceRecordSetsReplaceAll should be of the form "CommonTestResourceRecordSetsReplaceAll ..." (ST1020)
dnsprovider/pkg/dnsprovider/tests/commontests.go:78:1: comment on exported function CommonTestResourceRecordSetsDifferentTypes should be of the form "CommonTestResourceRecordSetsDifferentTypes ..." (ST1020)
pkg/apis/kops/instancegroup.go:318:1: comment on exported type LoadBalancer should be of the form "LoadBalancer ..." (with optional leading article) (ST1021)
pkg/apis/kops/v1alpha2/instancegroup.go:23:1: comment on exported type InstanceGroup should be of the form "InstanceGroup ..." (with optional leading article) (ST1021)
pkg/apis/kops/v1alpha2/networking.go:449:1: comment on exported type LyftVPCNetworkingSpec should be of the form "LyftVPCNetworkingSpec ..." (with optional leading article) (ST1021)
pkg/dns/gossip.go:21:1: comment on exported function IsGossipHostname should be of the form "IsGossipHostname ..." (ST1020)
pkg/kubeconfig/kubecfg_builder.go:47:1: comment on exported function NewKubeconfigBuilder should be of the form "NewKubeconfigBuilder ..." (ST1020)
pkg/kubeconfig/kubecfg_builder.go:82:1: comment on exported method BuildRestConfig should be of the form "BuildRestConfig ..." (ST1020)
pkg/kubeconfig/kubecfg_builder.go:102:1: comment on exported method WriteKubecfg should be of the form "WriteKubecfg ..." (ST1020)
pkg/model/alimodel/context.go:52:1: comment on exported method LinkToNatGateway should be of the form "LinkToNatGateway ..." (ST1020)
pkg/model/domodel/context.go:21:1: comment on exported type DOModelContext should be of the form "DOModelContext ..." (with optional leading article) (ST1021)
pkg/model/gcemodel/autoscalinggroup.go:38:1: comment on exported type AutoscalingGroupModelBuilder should be of the form "AutoscalingGroupModelBuilder ..." (with optional leading article) (ST1021)
pkg/nodeidentity/do/identify.go:51:1: comment on exported method Token should be of the form "Token ..." (ST1020)
pkg/resources/aws/aws.go:1560:1: comment on exported function ListELBV2s should be of the form "ListELBV2s ..." (ST1020)
pkg/resources/digitalocean/cloud.go:47:1: comment on exported method Token should be of the form "Token ..." (ST1020)
pkg/resources/spotinst/spotinst.go:84:1: comment on exported function NewInstanceGroup should be of the form "NewInstanceGroup ..." (ST1020)
protokube/pkg/gossip/dns/dns.go:29:1: comment on exported const DefaultZoneName should be of the form "DefaultZoneName ..." (ST1022)
protokube/pkg/gossip/mesh/mesh.pb.go:421:4: this value of iNdEx is never used (SA4006)
protokube/pkg/protokube/openstack_volume.go:53:1: comment on exported type OpenstackVolumes should be of the form "OpenstackVolumes ..." (with optional leading article) (ST1021)
upup/pkg/fi/assetstore.go:132:1: comment on exported method AddForTest should be of the form "AddForTest ..." (ST1020)
upup/pkg/fi/cloudup/alitasks/disk.go:128:1: comment on exported method RenderALI should be of the form "RenderALI ..." (ST1020)
upup/pkg/fi/cloudup/alitasks/eip_natgateway_association.go:34:1: comment on exported type EIP should be of the form "EIP ..." (with optional leading article) (ST1021)
upup/pkg/fi/cloudup/alitasks/loadbalancer.go:169:1: comment on exported method RenderALI should be of the form "RenderALI ..." (ST1020)
upup/pkg/fi/cloudup/alitasks/loadbalancerlistener.go:33:1: comment on exported type LoadBalancerListener should be of the form "LoadBalancerListener ..." (with optional leading article) (ST1021)
upup/pkg/fi/cloudup/alitasks/loadbalancerlistener.go:106:1: comment on exported method RenderALI should be of the form "RenderALI ..." (ST1020)
upup/pkg/fi/cloudup/alitasks/natgateway.go:30:1: comment on exported type NatGateway should be of the form "NatGateway ..." (with optional leading article) (ST1021)
upup/pkg/fi/cloudup/alitasks/securitygroup.go:32:1: comment on exported const SecurityResource should be of the form "SecurityResource ..." (ST1022)
upup/pkg/fi/cloudup/alitasks/sshkey.go:33:1: comment on exported type SSHKey should be of the form "SSHKey ..." (with optional leading article) (ST1021)
upup/pkg/fi/cloudup/alitasks/vpc.go:30:1: comment on exported type VPC should be of the form "VPC ..." (with optional leading article) (ST1021)
upup/pkg/fi/cloudup/alitasks/vswitch.go:31:1: comment on exported type VSwitch should be of the form "VSwitch ..." (with optional leading article) (ST1021)
upup/pkg/fi/cloudup/alitasks/vswitchSNAT.go:31:1: comment on exported type VSwitchSNAT should be of the form "VSwitchSNAT ..." (with optional leading article) (ST1021)
upup/pkg/fi/cloudup/aliup/ali_cloud.go:50:1: comment on exported var KubernetesKopsIdentity should be of the form "KubernetesKopsIdentity ..." (ST1022)
upup/pkg/fi/cloudup/awstasks/dhcp_options.go:33:1: comment on exported type DHCPOptions should be of the form "DHCPOptions ..." (with optional leading article) (ST1021)
upup/pkg/fi/cloudup/awstasks/dnsname.go:33:1: comment on exported type DNSName should be of the form "DNSName ..." (with optional leading article) (ST1021)
upup/pkg/fi/cloudup/awstasks/ebsvolume.go:32:1: comment on exported type EBSVolume should be of the form "EBSVolume ..." (with optional leading article) (ST1021)
upup/pkg/fi/cloudup/awstasks/external_load_balancer_attachment.go:31:1: comment on exported type ExternalLoadBalancerAttachment should be of the form "ExternalLoadBalancerAttachment ..." (with optional leading article) (ST1021)
upup/pkg/fi/cloudup/awstasks/external_target_group_attachment.go:32:1: comment on exported type ExternalTargetGroupAttachment should be of the form "ExternalTargetGroupAttachment ..." (with optional leading article) (ST1021)
upup/pkg/fi/cloudup/awstasks/iaminstanceprofile.go:34:1: comment on exported type IAMInstanceProfile should be of the form "IAMInstanceProfile ..." (with optional leading article) (ST1021)
upup/pkg/fi/cloudup/awstasks/iaminstanceprofilerole.go:32:1: comment on exported type IAMInstanceProfileRole should be of the form "IAMInstanceProfileRole ..." (with optional leading article) (ST1021)
upup/pkg/fi/cloudup/awstasks/iamoidcprovider.go:32:1: comment on exported type IAMOIDCProvider should be of the form "IAMOIDCProvider ..." (with optional leading article) (ST1021)
upup/pkg/fi/cloudup/awstasks/iamrole.go:38:1: comment on exported type IAMRole should be of the form "IAMRole ..." (with optional leading article) (ST1021)
upup/pkg/fi/cloudup/awstasks/iamrolepolicy.go:37:1: comment on exported type IAMRolePolicy should be of the form "IAMRolePolicy ..." (with optional leading article) (ST1021)
upup/pkg/fi/cloudup/awstasks/internetgateway.go:30:1: comment on exported type InternetGateway should be of the form "InternetGateway ..." (with optional leading article) (ST1021)
upup/pkg/fi/cloudup/awstasks/launchtemplate_target_cloudformation.go:150:1: comment on exported method CloudformationVersion should be of the form "CloudformationVersion ..." (ST1020)
upup/pkg/fi/cloudup/awstasks/load_balancer.go:39:1: comment on exported type LoadBalancer should be of the form "LoadBalancer ..." (with optional leading article) (ST1021)
upup/pkg/fi/cloudup/awstasks/load_balancer_attachment.go:32:1: comment on exported type LoadBalancerAttachment should be of the form "LoadBalancerAttachment ..." (with optional leading article) (ST1021)
upup/pkg/fi/cloudup/awstasks/natgateway.go:32:1: comment on exported type NatGateway should be of the form "NatGateway ..." (with optional leading article) (ST1021)
upup/pkg/fi/cloudup/awstasks/route.go:31:1: comment on exported type Route should be of the form "Route ..." (with optional leading article) (ST1021)
upup/pkg/fi/cloudup/awstasks/routetable.go:31:1: comment on exported type RouteTable should be of the form "RouteTable ..." (with optional leading article) (ST1021)
upup/pkg/fi/cloudup/awstasks/routetableassociation.go:31:1: comment on exported type RouteTableAssociation should be of the form "RouteTableAssociation ..." (with optional leading article) (ST1021)
upup/pkg/fi/cloudup/awstasks/securitygroup.go:33:1: comment on exported type SecurityGroup should be of the form "SecurityGroup ..." (with optional leading article) (ST1021)
upup/pkg/fi/cloudup/awstasks/securitygrouprule.go:34:1: comment on exported type SecurityGroupRule should be of the form "SecurityGroupRule ..." (with optional leading article) (ST1021)
upup/pkg/fi/cloudup/awstasks/sshkey.go:34:1: comment on exported type SSHKey should be of the form "SSHKey ..." (with optional leading article) (ST1021)
upup/pkg/fi/cloudup/awstasks/subnet.go:32:1: comment on exported type Subnet should be of the form "Subnet ..." (with optional leading article) (ST1021)
upup/pkg/fi/cloudup/awstasks/vpc.go:33:1: comment on exported type VPC should be of the form "VPC ..." (with optional leading article) (ST1021)
upup/pkg/fi/cloudup/awstasks/vpc_dhcpoptions_association.go:30:1: comment on exported type VPCDHCPOptionsAssociation should be of the form "VPCDHCPOptionsAssociation ..." (with optional leading article) (ST1021)
upup/pkg/fi/cloudup/awstasks/vpccidrblock.go:29:1: comment on exported type VPCCIDRBlock should be of the form "VPCCIDRBlock ..." (with optional leading article) (ST1021)
upup/pkg/fi/cloudup/awsup/aws_cloud.go:58:1: comment on exported const ClientMaxRetries should be of the form "ClientMaxRetries ..." (ST1022)
upup/pkg/fi/cloudup/awsup/status.go:44:1: comment on exported method FindClusterStatus should be of the form "FindClusterStatus ..." (ST1020)
upup/pkg/fi/cloudup/dotasks/droplet.go:32:1: comment on exported type Droplet should be of the form "Droplet ..." (with optional leading article) (ST1021)
upup/pkg/fi/cloudup/dotasks/loadbalancer.go:35:1: comment on exported type LoadBalancer should be of the form "LoadBalancer ..." (with optional leading article) (ST1021)
upup/pkg/fi/cloudup/dotasks/volume.go:32:1: comment on exported type Volume should be of the form "Volume ..." (with optional leading article) (ST1021)
upup/pkg/fi/cloudup/gcetasks/address.go:29:1: comment on exported type Address should be of the form "Address ..." (with optional leading article) (ST1021)
upup/pkg/fi/cloudup/gcetasks/instance.go:33:1: comment on exported type Instance should be of the form "Instance ..." (with optional leading article) (ST1021)
upup/pkg/fi/cloudup/gcetasks/instancegroupmanager.go:29:1: comment on exported type InstanceGroupManager should be of the form "InstanceGroupManager ..." (with optional leading article) (ST1021)
upup/pkg/fi/cloudup/gcetasks/instancetemplate.go:35:1: comment on exported const InstanceTemplateNamePrefixMaxLength should be of the form "InstanceTemplateNamePrefixMaxLength ..." (ST1022)
upup/pkg/fi/cloudup/gcetasks/network.go:30:1: comment on exported type Network should be of the form "Network ..." (with optional leading article) (ST1021)
upup/pkg/fi/cloudup/gcetasks/subnet.go:30:1: comment on exported type Subnet should be of the form "Subnet ..." (with optional leading article) (ST1021)
upup/pkg/fi/cloudup/openstacktasks/floatingip.go:32:1: comment on exported type FloatingIP should be of the form "FloatingIP ..." (with optional leading article) (ST1021)
upup/pkg/fi/cloudup/openstacktasks/instance.go:32:1: comment on exported type Instance should be of the form "Instance ..." (with optional leading article) (ST1021)
upup/pkg/fi/cloudup/openstacktasks/lb.go:34:1: comment on exported type LB should be of the form "LB ..." (with optional leading article) (ST1021)
upup/pkg/fi/cloudup/openstacktasks/lblistener.go:30:1: comment on exported type LBListener should be of the form "LBListener ..." (with optional leading article) (ST1021)
upup/pkg/fi/cloudup/openstacktasks/lbpool.go:28:1: comment on exported type LBPool should be of the form "LBPool ..." (with optional leading article) (ST1021)
upup/pkg/fi/cloudup/openstacktasks/network.go:28:1: comment on exported type Network should be of the form "Network ..." (with optional leading article) (ST1021)
upup/pkg/fi/cloudup/openstacktasks/poolassociation.go:30:1: comment on exported type PoolAssociation should be of the form "PoolAssociation ..." (with optional leading article) (ST1021)
upup/pkg/fi/cloudup/openstacktasks/port.go:29:1: comment on exported type Port should be of the form "Port ..." (with optional leading article) (ST1021)
upup/pkg/fi/cloudup/openstacktasks/router.go:28:1: comment on exported type Router should be of the form "Router ..." (with optional leading article) (ST1021)
upup/pkg/fi/cloudup/openstacktasks/routerinterface.go:29:1: comment on exported type RouterInterface should be of the form "RouterInterface ..." (with optional leading article) (ST1021)
upup/pkg/fi/cloudup/openstacktasks/securitygroup.go:31:1: comment on exported type SecurityGroup should be of the form "SecurityGroup ..." (with optional leading article) (ST1021)
upup/pkg/fi/cloudup/openstacktasks/servergroup.go:30:1: comment on exported type ServerGroup should be of the form "ServerGroup ..." (with optional leading article) (ST1021)
upup/pkg/fi/cloudup/openstacktasks/sshkey.go:31:1: comment on exported type SSHKey should be of the form "SSHKey ..." (with optional leading article) (ST1021)
upup/pkg/fi/cloudup/openstacktasks/subnet.go:29:1: comment on exported type Subnet should be of the form "Subnet ..." (with optional leading article) (ST1021)
upup/pkg/fi/cloudup/openstacktasks/volume.go:28:1: comment on exported type Volume should be of the form "Volume ..." (with optional leading article) (ST1021)
upup/pkg/fi/cloudup/spotinsttasks/elastigroup.go:42:1: comment on exported type Elastigroup should be of the form "Elastigroup ..." (with optional leading article) (ST1021)
upup/pkg/fi/cloudup/spotinsttasks/launch_spec.go:37:1: comment on exported type LaunchSpec should be of the form "LaunchSpec ..." (with optional leading article) (ST1021)
upup/pkg/fi/cloudup/spotinsttasks/ocean.go:39:1: comment on exported type Ocean should be of the form "Ocean ..." (with optional leading article) (ST1021)
upup/pkg/fi/context.go:249:1: comment on exported function NewExistsAndWarnIfChangesError should be of the form "NewExistsAndWarnIfChangesError ..." (ST1020)
upup/pkg/fi/context.go:256:1: comment on exported method Error should be of the form "Error ..." (ST1020)
upup/pkg/fi/fitasks/keypair.go:31:1: comment on exported type Keypair should be of the form "Keypair ..." (with optional leading article) (ST1021)
upup/pkg/fi/fitasks/keypair.go:55:1: comment on exported method CheckExisting should be of the form "CheckExisting ..." (ST1020)
upup/pkg/fi/fitasks/managedfile.go:29:1: comment on exported type ManagedFile should be of the form "ManagedFile ..." (with optional leading article) (ST1021)
upup/pkg/fi/fitasks/mirrorkeystore.go:25:1: comment on exported type MirrorKeystore should be of the form "MirrorKeystore ..." (with optional leading article) (ST1021)
upup/pkg/fi/fitasks/mirrorsecrets.go:26:1: comment on exported type MirrorSecrets should be of the form "MirrorSecrets ..." (with optional leading article) (ST1021)
upup/pkg/fi/fitasks/secret.go:25:1: comment on exported type Secret should be of the form "Secret ..." (with optional leading article) (ST1021)
upup/pkg/fi/fitasks/secret.go:33:1: comment on exported method CheckExisting should be of the form "CheckExisting ..." (ST1020)
upup/pkg/fi/resources.go:248:1: comment on exported method AsBytes should be of the form "AsBytes ..." (ST1020)
upup/pkg/kutil/import_cluster.go:680:1: comment on exported function GetInstanceUserData should be of the form "GetInstanceUserData ..." (ST1020)
```

hack/.staticcheck_failures

@@ -0,0 +1 @@
+dns-controller/pkg/dns

hack/verify-staticcheck.sh

@@ -35,6 +35,10 @@ CHECKS=(
   "-ST1006"  # Poorly chosen receiver name
   "-ST1012"  # Poorly chosen name for error variable
   "-ST1016"  # Use consistent method receiver names
+  "-ST1020"  # Comment on exported method should be of the form ...
+  "-ST1021"  # Comment on exported type should be of the form ...
+  "-ST1022"  # Comment on exported const should be of the form ...
+  "-SA5011"  # Possible nil pointer dereference. staticcheck doesn't yet recognize klog.Fatal
 )
 export IFS=','; checks="${CHECKS[*]}"; unset IFS
 

nodeup/pkg/model/kubelet_test.go

@@ -62,6 +62,7 @@ func Test_InstanceGroupKubeletMerge(t *testing.T) {
 	}
 	if mergedKubeletSpec == nil {
 		t.Error("Returned nil kubelet spec")
+		t.FailNow()
 	}
 
 	if mergedKubeletSpec.NvidiaGPUs != instanceGroup.Spec.Kubelet.NvidiaGPUs {

pkg/apis/kops/validation/legacy.go

@@ -135,7 +135,7 @@ func ValidateCluster(c *kops.Cluster, strict bool) field.ErrorList {
 		} else {
 			_, networkCIDR, err = net.ParseCIDR(c.Spec.NetworkCIDR)
 			if err != nil {
-				allErrs = append(allErrs, field.Invalid(fieldSpec.Child("networkCIDR"), c.Spec.NetworkCIDR, fmt.Sprintf("Cluster had an invalid networkCIDR")))
+				allErrs = append(allErrs, field.Invalid(fieldSpec.Child("networkCIDR"), c.Spec.NetworkCIDR, "Cluster had an invalid networkCIDR"))
 			}
 		}
 	}
@@ -147,7 +147,7 @@ func ValidateCluster(c *kops.Cluster, strict bool) field.ErrorList {
 			for _, AdditionalNetworkCIDR := range c.Spec.AdditionalNetworkCIDRs {
 				_, IPNetAdditionalNetworkCIDR, err := net.ParseCIDR(AdditionalNetworkCIDR)
 				if err != nil {
-					allErrs = append(allErrs, field.Invalid(fieldSpec.Child("additionalNetworkCIDRs"), AdditionalNetworkCIDR, fmt.Sprintf("Cluster had an invalid additionalNetworkCIDRs")))
+					allErrs = append(allErrs, field.Invalid(fieldSpec.Child("additionalNetworkCIDRs"), AdditionalNetworkCIDR, "Cluster had an invalid additionalNetworkCIDRs"))
 				}
 				additionalNetworkCIDRs = append(additionalNetworkCIDRs, IPNetAdditionalNetworkCIDR)
 			}

protokube/pkg/gossip/mesh/mesh.pb.go

@@ -14,7 +14,7 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 
-//lint:file-ignore U1000 - Generated code
+//lint:file-ignore U1000,SA4006 - Generated code
 
 // Code generated by protoc-gen-gogo.
 // source: k8s.io/kops/protokube/pkg/gossip/mesh/mesh.proto

protokube/pkg/gossip/mesh/mesh.proto

@@ -1,4 +1,4 @@
-// To regenerate mesh.pb.go run make protokube-gocode
+// To regenerate mesh.pb.go run make protobuf
 syntax = 'proto3';
 
 package mesh;

upup/pkg/fi/nodeup/nodetasks/update_packages.go

@@ -45,7 +45,7 @@ func (p *UpdatePackages) GetDependencies(tasks map[string]fi.Task) []fi.Task {
 }
 
 func (p *UpdatePackages) String() string {
-	return fmt.Sprintf("UpdatePackages")
+	return "UpdatePackages"
 }
 
 func (e *UpdatePackages) Find(c *fi.Context) (*UpdatePackages, error) {