allow user defined output filename

builder/virtualbox/common/output_config.go

@@ -17,6 +17,10 @@ type OutputConfig struct {
 	// the builder. By default this is output-BUILDNAME where "BUILDNAME" is the
 	// name of the build.
 	OutputDir string `mapstructure:"output_directory" required:"false"`
+	// This is the base name of the file (excluding the file extension) where
+	// the resulting virtual machine will be created. By default this is the
+	// `vm_name`.
+	OutputFilename string `mapstructure:"output_filename" required:"false"`
 }
 
 func (c *OutputConfig) Prepare(ctx *interpolate.Context, pc *common.PackerConfig) []error {

builder/virtualbox/common/step_export.go

@@ -19,6 +19,7 @@ import (
 type StepExport struct {
 	Format         string
 	OutputDir      string
+	OutputFilename string
 	ExportOpts     []string
 	Bundling       VBoxBundleConfig
 	SkipNatMapping bool
@@ -37,6 +38,9 @@ func (s *StepExport) Run(ctx context.Context, state multistep.StateBag) multiste
 	driver := state.Get("driver").(Driver)
 	ui := state.Get("ui").(packer.Ui)
 	vmName := state.Get("vmName").(string)
+	if s.OutputFilename == "" {
+		s.OutputFilename = vmName
+	}
 
 	// Skip export if requested
 	if s.SkipExport {
@@ -61,7 +65,7 @@ func (s *StepExport) Run(ctx context.Context, state multistep.StateBag) multiste
 	}
 
 	// Export the VM to an OVF
-	outputPath := filepath.Join(s.OutputDir, vmName+"."+s.Format)
+	outputPath := filepath.Join(s.OutputDir, s.OutputFilename+"."+s.Format)
 
 	command := []string{
 		"export",

builder/virtualbox/iso/builder.go

@@ -396,6 +396,7 @@ func (b *Builder) Run(ctx context.Context, ui packer.Ui, hook packer.Hook) (pack
 		&vboxcommon.StepExport{
 			Format:         b.config.Format,
 			OutputDir:      b.config.OutputDir,
+			OutputFilename: b.config.OutputFilename,
 			ExportOpts:     b.config.ExportConfig.ExportOpts,
 			Bundling:       b.config.VBoxBundleConfig,
 			SkipNatMapping: b.config.SkipNatMapping,

builder/virtualbox/ovf/builder.go

@@ -158,6 +158,7 @@ func (b *Builder) Run(ctx context.Context, ui packer.Ui, hook packer.Hook) (pack
 		&vboxcommon.StepExport{
 			Format:         b.config.Format,
 			OutputDir:      b.config.OutputDir,
+			OutputFilename: b.config.OutputFilename,
 			ExportOpts:     b.config.ExportConfig.ExportOpts,
 			SkipNatMapping: b.config.SkipNatMapping,
 			SkipExport:     b.config.SkipExport,

builder/virtualbox/vm/builder.go

@@ -141,6 +141,7 @@ func (b *Builder) Run(ctx context.Context, ui packer.Ui, hook packer.Hook) (pack
 		&vboxcommon.StepExport{
 			Format:         b.config.Format,
 			OutputDir:      b.config.OutputDir,
+			OutputFilename: b.config.OutputFilename,
 			ExportOpts:     b.config.ExportOpts,
 			SkipNatMapping: b.config.SkipNatMapping,
 			SkipExport:     b.config.SkipExport,