Address perfsprint linter violations

"fmt.Sprintf can be replaced with string concatenation"
"fmt.Errorf can be replaced with errors.New"

Signed-off-by: Tom Pantelis <[email protected]>

coredns/gateway/controller.go

@@ -20,7 +20,6 @@ package gateway
 
 import (
 	"context"
-	"fmt"
 	"os"
 	"sync/atomic"
 
@@ -110,7 +109,7 @@ func (c *Controller) Start(client dynamic.Interface) error {
 	go c.informer.Run(c.stopCh)
 
 	if ok := cache.WaitForCacheSync(c.stopCh, c.informer.HasSynced); !ok {
-		return fmt.Errorf("failed to wait for informer cache to sync")
+		return errors.New("failed to wait for informer cache to sync")
 	}
 
 	go c.queue.Run(c.stopCh, c.processNextGateway)

coredns/loadbalancer/smooth_weighted_round_robin.go

@@ -21,6 +21,7 @@ package loadbalancer
 import (
 	"fmt"
 
+	"github.com/pkg/errors"
 	"github.com/submariner-io/admiral/pkg/log"
 	logf "sigs.k8s.io/controller-runtime/pkg/log"
 )
@@ -67,7 +68,7 @@ func (lb *smoothWeightedRR) ItemCount() int {
 // Add - adds a new unique item to the list.
 func (lb *smoothWeightedRR) Add(item interface{}, weight int64) error {
 	if item == nil {
-		return fmt.Errorf("item cannot be nil")
+		return errors.New("item cannot be nil")
 	}
 
 	if weight < 0 {

pkg/agent/controller/controller_suite_test.go

@@ -534,7 +534,7 @@ func (c *cluster) awaitServiceExportCondition(expected ...*mcsv1a1.ServiceExport
 			}
 
 			return nil
-		}).ShouldNot(BeNil(), fmt.Sprintf("ServiceExport condition not received. Expected: %s", resource.ToJSON(expected[i])))
+		}).ShouldNot(BeNil(), "ServiceExport condition not received. Expected: "+resource.ToJSON(expected[i]))
 	}
 
 	last := len(expected) - 1
@@ -551,7 +551,7 @@ func (c *cluster) awaitServiceExportCondition(expected ...*mcsv1a1.ServiceExport
 		}
 
 		return nil
-	}).ShouldNot(BeNil(), fmt.Sprintf("ServiceExport condition not found. Expected: %s", resource.ToJSON(expected[last])))
+	}).ShouldNot(BeNil(), "ServiceExport condition not found. Expected: "+resource.ToJSON(expected[last]))
 
 	for i := range expected {
 		assertEquivalentConditions(actual[i], expected[i])
@@ -575,16 +575,15 @@ func (c *cluster) ensureLastServiceExportCondition(expected *mcsv1a1.ServiceExpo
 			}
 		}
 
-		Fail(fmt.Sprintf("ServiceExport condition not found. Expected: %s", resource.ToJSON(expected)))
+		Fail("ServiceExport condition not found. Expected: " + resource.ToJSON(expected))
 
 		return -1
 	}
 
 	initialIndex := indexOfLastCondition()
 	Consistently(func() int {
 		return indexOfLastCondition()
-	}).Should(Equal(initialIndex), fmt.Sprintf("Expected ServiceExport condition to not change: %s",
-		resource.ToJSON(expected)))
+	}).Should(Equal(initialIndex), "Expected ServiceExport condition to not change: "+resource.ToJSON(expected))
 }
 
 func (c *cluster) ensureNoServiceExportCondition(condType mcsv1a1.ServiceExportConditionType, serviceExports ...*mcsv1a1.ServiceExport) {

test/e2e/framework/framework.go

@@ -411,7 +411,7 @@ func (f *Framework) AwaitPodIngressIPs(targetCluster framework.ClusterIndex, svc
 	ipList := make([]string, 0)
 
 	for i := range len(podList.Items) {
-		ingressIPName := fmt.Sprintf("pod-%s", podList.Items[i].Name)
+		ingressIPName := "pod-" + podList.Items[i].Name
 		ingressIP := f.Framework.AwaitGlobalIngressIP(targetCluster, ingressIPName, svc.Namespace)
 
 		if isLocal {
@@ -652,7 +652,7 @@ func (f *Framework) GetHealthCheckEnabledInfo(cluster framework.ClusterIndex) bo
 	}, func(result interface{}) (bool, string, error) {
 		unstructuredSubmarinerConfig := result.(*unstructured.Unstructured)
 
-		framework.By(fmt.Sprintf("Getting the Submariner Config, for cluster %s", framework.TestContext.ClusterIDs[cluster]))
+		framework.By("Getting the Submariner Config, for cluster " + framework.TestContext.ClusterIDs[cluster])
 
 		var found bool
 		var err error