Add -network flag to e2e test framework for ILB subnet creation

We need this to create the ILB subnet in the right network

cmd/e2e-test/main_test.go

@@ -43,6 +43,7 @@ var (
 		kubeconfig          string
 		project             string
 		region              string
+		network             string
 		seed                int64
 		destroySandboxes    bool
 		handleSIGINT        bool
@@ -63,6 +64,7 @@ func init() {
 	flag.BoolVar(&flags.inCluster, "inCluster", false, "set to true if running in the cluster")
 	flag.StringVar(&flags.project, "project", "", "GCP project")
 	flag.StringVar(&flags.region, "region", "", "GCP Region (e.g. us-central1)")
+	flag.StringVar(&flags.network, "network", "", "GCP network name (e.g. default) to use for ilb subnet")
 	flag.Int64Var(&flags.seed, "seed", -1, "random seed")
 	flag.BoolVar(&flags.destroySandboxes, "destroySandboxes", true, "set to false to leave sandboxed resources for debugging")
 	flag.BoolVar(&flags.handleSIGINT, "handleSIGINT", true, "catch SIGINT to perform clean")
@@ -88,6 +90,10 @@ func TestMain(m *testing.M) {
 		os.Exit(1)
 	}
 
+	if flags.network == "" {
+		klog.Info("No network provided, will not create ILB Subnet")
+	}
+
 	fmt.Printf("Version: %q, Commit: %q\n", version.Version, version.GitCommit)
 
 	var err error
@@ -113,6 +119,7 @@ func TestMain(m *testing.M) {
 	Framework = e2e.NewFramework(kubeconfig, e2e.Options{
 		Project:             flags.project,
 		Region:              flags.region,
+		Network:             flags.network,
 		Seed:                flags.seed,
 		DestroySandboxes:    flags.destroySandboxes,
 		GceEndpointOverride: flags.gceEndpointOverride,

pkg/e2e/fixtures.go

@@ -265,6 +265,12 @@ func DeleteGCPAddress(s *Sandbox, name string) error {
 // CreateILBSubnet creates the ILB subnet
 func CreateILBSubnet(s *Sandbox) error {
 	klog.V(3).Info("CreateILBSubnet()")
+
+	// If no network is provided, we don't try to create the subnet
+	if s.f.Network == "" {
+		return ErrSubnetExists
+	}
+
 	name := "ilb-subnet-ingress-e2e"
 
 	// Try up to 10 different subnets since we can't conflict with anything in the test project
@@ -285,7 +291,7 @@ func CreateILBSubnet(s *Sandbox) error {
 
 // trySubnetCreate is a helper for CreateILBSubnet
 func trySubnetCreate(s *Sandbox, name, ipCidrRange string) error {
-	networkID := cloud.ResourceID{ProjectID: s.f.Project, Resource: "networks", Key: meta.GlobalKey("default")}
+	networkID := cloud.ResourceID{ProjectID: s.f.Project, Resource: "networks", Key: meta.GlobalKey(s.f.Network)}
 
 	subnet := &computebeta.Subnetwork{
 		Name:        name,

pkg/e2e/framework.go

@@ -43,6 +43,7 @@ import (
 type Options struct {
 	Project             string
 	Region              string
+	Network             string
 	Seed                int64
 	DestroySandboxes    bool
 	GceEndpointOverride string
@@ -64,6 +65,7 @@ func NewFramework(config *rest.Config, options Options) *Framework {
 		BackendConfigClient: backendConfigClient,
 		Project:             options.Project,
 		Region:              options.Region,
+		Network:             options.Network,
 		Cloud:               theCloud,
 		Rand:                rand.New(rand.NewSource(options.Seed)),
 		destroySandboxes:    options.DestroySandboxes,
@@ -79,6 +81,7 @@ type Framework struct {
 	BackendConfigClient *backendconfigclient.Clientset
 	Project             string
 	Region              string
+	Network             string
 	Cloud               cloud.Cloud
 	Rand                *rand.Rand
 	statusManager       *StatusManager