Enhance e2e test

1. Check the error when waiting for restice daemonset to be ready, so
   the timeout will be reported
2. Add support for gcp provider and fail early if the provider is
   unknown

Signed-off-by: Daniel Jiang <jiangd@vmware.com>

test/e2e/install.go

@@ -280,7 +280,7 @@ func waitVeleroReady(ctx context.Context, namespace string, useRestic bool) erro
 
 	if useRestic {
 		fmt.Println("Waiting for Velero restic daemonset to be ready.")
-		wait.PollImmediate(5*time.Second, 1*time.Minute, func() (bool, error) {
+		err := wait.PollImmediate(5*time.Second, 1*time.Minute, func() (bool, error) {
 			stdout, stderr, err := velerexec.RunCommand(exec.CommandContext(ctx, "kubectl", "get", "daemonset/restic",
 				"-o", "json", "-n", namespace))
 			if err != nil {
@@ -295,6 +295,9 @@ func waitVeleroReady(ctx context.Context, namespace string, useRestic bool) erro
 			}
 			return false, nil
 		})
+		if err != nil {
+			return errors.Wrap(err, "fail to wait for the velero restic ready")
+		}
 	}
 
 	fmt.Printf("Velero is installed and ready to be tested in the %s namespace! ⛵ \n", namespace)

test/e2e/velero_utils.go

@@ -46,8 +46,10 @@ func getProviderPlugins(providerName string) []string {
 		return []string{"velero/velero-plugin-for-microsoft-azure:v1.2.0"}
 	case "vsphere":
 		return []string{"velero/velero-plugin-for-aws:v1.2.1", "vsphereveleroplugin/velero-plugin-for-vsphere:v1.1.1"}
+	case "gcp":
+		return []string{"velero/velero-plugin-for-gcp:v1.2.1"}
 	default:
-		return []string{""}
+		panic(fmt.Errorf("unknown provider name: %s", providerName))
 	}
 }