Cleanup e2e namespaces before test start (#1655)

When an e2e test panics, it can leave behind populated GameServer
namespaces, that are never cleaned up!

This implements a fix in which the e2e test will search for e2e
namespaces in the cluster, and delete them all before tests begin.

Closes #1653

test/e2e/framework/framework.go

@@ -58,6 +58,10 @@ const (
 	AutoCleanupLabelValue = "true"
 )
 
+// NamespaceLabel is the label that is put on all namespaces that are created
+// for e2e tests.
+var NamespaceLabel = map[string]string{"owner": "e2e-test"}
+
 // Framework is a testing framework
 type Framework struct {
 	KubeClient      kubernetes.Interface
@@ -500,7 +504,7 @@ func (f *Framework) CreateNamespace(namespace string) error {
 	ns := &corev1.Namespace{
 		ObjectMeta: metav1.ObjectMeta{
 			Name:   namespace,
-			Labels: map[string]string{"owner": "e2e-test"},
+			Labels: NamespaceLabel,
 		},
 	}
 

test/e2e/main_test.go

@@ -23,6 +23,8 @@ import (
 	e2eframework "agones.dev/agones/test/e2e/framework"
 	"github.com/sirupsen/logrus"
 	log "github.com/sirupsen/logrus"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"k8s.io/apimachinery/pkg/labels"
 )
 
 var framework *e2eframework.Framework
@@ -49,6 +51,11 @@ func TestMain(m *testing.M) {
 		os.Exit(1)
 	}
 
+	if err = cleanupNamespaces(framework); err != nil {
+		log.WithError(err).Error("failed to cleanup e2e namespaces")
+		os.Exit(1)
+	}
+
 	if framework.Namespace == "" {
 		// use a custom namespace - Unix timestamp
 		framework.Namespace = strconv.Itoa(int(time.Now().Unix()))
@@ -84,3 +91,21 @@ func TestMain(m *testing.M) {
 
 	exitCode = m.Run()
 }
+
+func cleanupNamespaces(framework *e2eframework.Framework) error {
+	// list all e2e namespaces
+	opts := metav1.ListOptions{LabelSelector: labels.Set(e2eframework.NamespaceLabel).String()}
+	list, err := framework.KubeClient.CoreV1().Namespaces().List(opts)
+	if err != nil {
+		return err
+	}
+
+	// loop through them, and delete them
+	for _, ns := range list.Items {
+		if err := framework.DeleteNamespace(ns.ObjectMeta.Name); err != nil {
+			return err
+		}
+	}
+
+	return nil
+}