e2e: add routine to wait for pod readiness

e2e/internal/kubeclient/deploy.go

@@ -4,8 +4,10 @@ import (
 	"context"
 	"fmt"
 
+	corev1 "k8s.io/api/core/v1"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
+	"k8s.io/apimachinery/pkg/watch"
 	"k8s.io/client-go/dynamic"
 )
 
@@ -40,3 +42,31 @@ func (c *Kubeclient) Deploy(ctx context.Context, manifests ...*unstructured.Unst
 	}
 	return nil
 }
+
+// WaitForPod watches the given pod and blocks until it meets the condition Ready=True.
+func (c *Kubeclient) WaitForPod(ctx context.Context, namespace, name string) error {
+	watcher, err := c.client.CoreV1().Pods(namespace).Watch(ctx, metav1.ListOptions{FieldSelector: "metadata.name=" + name})
+	if err != nil {
+		return err
+	}
+	for {
+		select {
+		case evt := <-watcher.ResultChan():
+			switch evt.Type {
+			case watch.Added:
+				fallthrough
+			case watch.Modified:
+				pod := evt.Object.(*corev1.Pod)
+				for _, cond := range pod.Status.Conditions {
+					if cond.Type == corev1.PodReady && cond.Status == corev1.ConditionTrue {
+						return nil
+					}
+				}
+			default:
+				return fmt.Errorf("unexpected watch event while waiting for pod %s/%s: %#v", namespace, name, evt.Object)
+			}
+		case <-ctx.Done():
+			return ctx.Err()
+		}
+	}
+}