Add import_opts to the virtualbox-ovf builder. My use case is that I

have existing virtualbox virtual machines where I need to keep the mac
addresses so that the network interfaces come up when packer boots them.
Otherwise I just get SSH timeout and I'm unable to configure the machines.

builder/virtualbox/common/driver.go

@@ -23,7 +23,7 @@ type Driver interface {
 	Delete(string) error
 
 	// Import a VM
-	Import(string, string) error
+	Import(string, string, string) error
 
 	// Checks if the VM with the given name is running.
 	IsRunning(string) (bool, error)

builder/virtualbox/common/driver_4_2.go

@@ -40,11 +40,12 @@ func (d *VBox42Driver) Delete(name string) error {
 	return d.VBoxManage("unregistervm", name, "--delete")
 }
 
-func (d *VBox42Driver) Import(name, path string) error {
+func (d *VBox42Driver) Import(name, path, opts string) error {
 	args := []string{
 		"import", path,
 		"--vsys", "0",
 		"--vmname", name,
+		"--options", opts,
 	}
 
 	return d.VBoxManage(args...)

builder/virtualbox/common/driver_mock.go

@@ -16,6 +16,7 @@ type DriverMock struct {
 	ImportCalled bool
 	ImportName   string
 	ImportPath   string
+	ImportOpts   string
 	ImportErr    error
 
 	IsRunningName   string
@@ -51,10 +52,11 @@ func (d *DriverMock) Delete(name string) error {
 	return d.DeleteErr
 }
 
-func (d *DriverMock) Import(name, path string) error {
+func (d *DriverMock) Import(name, path, opts string) error {
 	d.ImportCalled = true
 	d.ImportName = name
 	d.ImportPath = path
+	d.ImportOpts = opts
 	return d.ImportErr
 }
 

builder/virtualbox/ovf/builder.go

@@ -58,6 +58,7 @@ func (b *Builder) Run(ui packer.Ui, hook packer.Hook, cache packer.Cache) (packe
 		&StepImport{
 			Name:       b.config.VMName,
 			SourcePath: b.config.SourcePath,
+			ImportOpts: b.config.ImportOpts,
 		},
 		/*
 			new(stepAttachGuestAdditions),

builder/virtualbox/ovf/config.go

@@ -23,6 +23,7 @@ type Config struct {
 
 	SourcePath string `mapstructure:"source_path"`
 	VMName     string `mapstructure:"vm_name"`
+	ImportOpts string `mapstructure:"import_opts"`
 
 	tpl *packer.ConfigTemplate
 }
@@ -59,6 +60,7 @@ func NewConfig(raws ...interface{}) (*Config, []string, error) {
 	templates := map[string]*string{
 		"source_path": &c.SourcePath,
 		"vm_name":     &c.VMName,
+		"import_opts": &c.ImportOpts,
 	}
 
 	for n, ptr := range templates {

builder/virtualbox/ovf/step_import.go

@@ -11,6 +11,7 @@ import (
 type StepImport struct {
 	Name       string
 	SourcePath string
+	ImportOpts string
 
 	vmName string
 }
@@ -20,7 +21,7 @@ func (s *StepImport) Run(state multistep.StateBag) multistep.StepAction {
 	ui := state.Get("ui").(packer.Ui)
 
 	ui.Say(fmt.Sprintf("Importing VM: %s", s.SourcePath))
-	if err := driver.Import(s.Name, s.SourcePath); err != nil {
+	if err := driver.Import(s.Name, s.SourcePath, s.ImportOpts); err != nil {
 		err := fmt.Errorf("Error importing VM: %s", err)
 		state.Put("error", err)
 		ui.Error(err.Error())

website/source/docs/builders/virtualbox-ovf.html.markdown

@@ -147,6 +147,10 @@ Optional:
   exported. By default this is "packer-BUILDNAME", where "BUILDNAME" is
   the name of the build.
 
+* `import_opts` (string) - Additional options to pass to the `VBoxManage import`.
+  This can be useful for passing "keepallmacs" or "keepnatmacs" options for existing
+  ovf images.
+
 ## Guest Additions
 
 Packer will automatically download the proper guest additions for the