add image transfer for DigitalOcean

builder/digitalocean/config.go

@@ -29,6 +29,7 @@ type Config struct {
 	PrivateNetworking bool          `mapstructure:"private_networking"`
 	Monitoring        bool          `mapstructure:"monitoring"`
 	SnapshotName      string        `mapstructure:"snapshot_name"`
+	SnapshotRegions   []string      `mapstructure:"snapshot_regions"`
 	StateTimeout      time.Duration `mapstructure:"state_timeout"`
 	DropletName       string        `mapstructure:"droplet_name"`
 	UserData          string        `mapstructure:"user_data"`

builder/digitalocean/step_snapshot.go

@@ -60,6 +60,44 @@ func (s *stepSnapshot) Run(state multistep.StateBag) multistep.StepAction {
 		return multistep.ActionHalt
 	}
 
+	if len(c.SnapshotRegions) > 0 {
+		regionSet := make(map[string]struct{})
+		regions := make([]string, 0, len(c.SnapshotRegions))
+
+		for _, region := range c.SnapshotRegions {
+			// If we already saw the region, then don't look again
+			if _, ok := regionSet[region]; ok {
+				continue
+			}
+
+			// Mark that we saw the region
+			regionSet[region] = struct{}{}
+
+			regions = append(regions, region)
+		}
+		c.SnapshotRegions = regions
+		for transfer := range c.SnapshotRegions {
+			transferRequest := &godo.ActionRequest{
+				"type":   "transfer",
+				"region": c.SnapshotRegions[transfer],
+			}
+			imageTransfer, _, err := client.ImageActions.Transfer(context.TODO(), images[0].ID, transferRequest)
+			if err != nil {
+				err := fmt.Errorf("Error transfering snapshot: %s", err)
+				state.Put("error", err)
+				ui.Error(err.Error())
+				return multistep.ActionHalt
+			}
+			ui.Say(fmt.Sprintf("Transfering Snapshot ID: %d", imageTransfer.ID))
+
+		}
+
+		ui.Say(fmt.Sprintf("Snapshot region: %d", len(regions)))
+		// ui.Say(fmt.Sprintf("Snapshot regions: %s", strings.Join(c.SnapshotRegions[:], ",")))
+
+		//client.ImageActions.Transfer(context.TODO(), )
+	}
+
 	var imageId int
 	if len(images) == 1 {
 		imageId = images[0].ID