Support redefining network in vsphere-clone builder

Fixes #226

clone/step_clone.go

@@ -13,6 +13,7 @@ type CloneConfig struct {
 	Template    string `mapstructure:"template"`
 	DiskSize    int64  `mapstructure:"disk_size"`
 	LinkedClone bool   `mapstructure:"linked_clone"`
+	Network     string `mapstructure:"network"`
 	Notes       string `mapstructure:"notes"`
 }
 
@@ -68,6 +69,7 @@ func (s *StepCloneVM) Run(ctx context.Context, state multistep.StateBag) multist
 		ResourcePool: s.Location.ResourcePool,
 		Datastore:    s.Location.Datastore,
 		LinkedClone:  s.Config.LinkedClone,
+		Network:      s.Config.Network,
 		Annotation:   s.Config.Notes,
 	})
 	if err != nil {

driver/vm.go

@@ -24,6 +24,7 @@ type CloneConfig struct {
 	ResourcePool string
 	Datastore    string
 	LinkedClone  bool
+	Network      string
 	Annotation   string
 }
 
@@ -222,10 +223,41 @@ func (template *VirtualMachine) Clone(ctx context.Context, config *CloneConfig)
 		cloneSpec.Snapshot = tpl.Snapshot.CurrentSnapshot
 	}
 
+	var configSpec types.VirtualMachineConfigSpec
+	cloneSpec.Config = &configSpec
+
 	if config.Annotation != "" {
-		var configSpec types.VirtualMachineConfigSpec
 		configSpec.Annotation = config.Annotation
-		cloneSpec.Config = &configSpec
+	}
+
+	if config.Network != "" {
+		net, err := template.driver.finder.Network(ctx, config.Network)
+		if err != nil {
+			return nil, err
+		}
+		backing, err := net.EthernetCardBackingInfo(ctx)
+		if err != nil {
+			return nil, err
+		}
+
+		devices, err := template.vm.Device(ctx)
+		if err != nil {
+			return nil, err
+		}
+
+		adapter, err := findNetworkAdapter(devices)
+		if err != nil {
+			return nil, err
+		}
+
+		adapter.GetVirtualEthernetCard().Backing = backing
+
+		config := &types.VirtualDeviceConfigSpec{
+			Device:    adapter.(types.BaseVirtualDevice),
+			Operation: types.VirtualDeviceConfigSpecOperationEdit,
+		}
+
+		configSpec.DeviceChange = append(configSpec.DeviceChange, config)
 	}
 
 	task, err := template.vm.Clone(template.driver.ctx, folder.folder, config.Name, cloneSpec)
@@ -630,3 +662,12 @@ func (vm *VirtualMachine) AddConfigParams(params map[string]string) error {
 	_, err = task.WaitForResult(vm.driver.ctx, nil)
 	return err
 }
+
+func findNetworkAdapter(l object.VirtualDeviceList) (types.BaseVirtualEthernetCard, error) {
+	c := l.SelectByType((*types.VirtualEthernetCard)(nil))
+	if len(c) == 0 {
+		return nil, errors.New("no network adapter device found")
+	}
+
+	return c[0].(types.BaseVirtualEthernetCard), nil
+}