we lost the skip_add step somewhere

builder/vagrant/builder.go

@@ -223,6 +223,7 @@ func (b *Builder) Run(ui packer.Ui, hook packer.Hook, cache packer.Cache) (packe
 			SourceBox:    b.config.SourceBox,
 			BoxName:      b.config.BoxName,
 			GlobalID:     b.config.GlobalID,
+			SkipAdd:      b.config.SkipAdd,
 		},
 		&StepUp{
 			TeardownMethod: b.config.TeardownMethod,

builder/vagrant/step_add_box.go

@@ -21,10 +21,10 @@ type StepAddBox struct {
 	SourceBox    string
 	BoxName      string
 	GlobalID     string
+	SkipAdd      bool
 }
 
 func (s *StepAddBox) generateAddArgs() []string {
-
 	addArgs := []string{}
 
 	if strings.HasSuffix(s.SourceBox, ".box") {
@@ -72,6 +72,11 @@ func (s *StepAddBox) Run(_ context.Context, state multistep.StateBag) multistep.
 	driver := state.Get("driver").(VagrantDriver)
 	ui := state.Get("ui").(packer.Ui)
 
+	if s.SkipAdd {
+		ui.Say("skip_add was set so we assume the box is already in Vagrant...")
+		return multistep.ActionContinue
+	}
+
 	if s.GlobalID != "" {
 		ui.Say("Using a global-id; skipping Vagrant add command...")
 		return multistep.ActionContinue