add flags for ipv6, backups and private networking to the DigitalOcean driver

Signed-off-by: Sascha Hanse <shanse@gmail.com>

drivers/digitalocean/digitalocean.go

@@ -30,6 +30,9 @@ type Driver struct {
 	Region            string
 	SSHKeyID          int
 	Size              string
+	IPv6              bool
+	Backups           bool
+	PrivateNetworking bool
 	CaCertPath        string
 	PrivateKeyPath    string
 	DriverKeyPath     string
@@ -73,6 +76,21 @@ func GetCreateFlags() []cli.Flag {
 			Usage:  "Digital Ocean size",
 			Value:  "512mb",
 		},
+		cli.BoolFlag{
+			EnvVar: "DIGITALOCEAN_IPV6",
+			Name:   "digitalocean-ipv6",
+			Usage:  "enable ipv6 for droplet",
+		},
+		cli.BoolFlag{
+			EnvVar: "DIGITALOCEAN_PRIVATE_NETWORKING",
+			Name:   "digitalocean-private-networking",
+			Usage:  "enable private networking for droplet",
+		},
+		cli.BoolFlag{
+			EnvVar: "DIGITALOCEAN_BACKUPS",
+			Name:   "digitalocean-backups",
+			Usage:  "enable backups for droplet",
+		},
 	}
 }
 
@@ -89,6 +107,9 @@ func (d *Driver) SetConfigFromFlags(flags drivers.DriverOptions) error {
 	d.Image = flags.String("digitalocean-image")
 	d.Region = flags.String("digitalocean-region")
 	d.Size = flags.String("digitalocean-size")
+	d.IPv6 = flags.Bool("digitalocean-ipv6")
+	d.PrivateNetworking = flags.Bool("digitalocean-private-networking")
+	d.Backups = flags.Bool("digitalocean-backups")
 	d.SwarmMaster = flags.Bool("swarm-master")
 	d.SwarmHost = flags.String("swarm-host")
 	d.SwarmDiscovery = flags.String("swarm-discovery")
@@ -101,8 +122,19 @@ func (d *Driver) SetConfigFromFlags(flags drivers.DriverOptions) error {
 }
 
 func (d *Driver) PreCreateCheck() error {
+	client := d.getClient()
+	regions, _, err := client.Regions.List(nil)
+	if err != nil {
+		return err
+	}
+	for _, region := range regions {
+		if region.Slug == d.Region {
 			return nil
 		}
+	}
+
+	return fmt.Errorf("digitalocean requires a valid region")
+}
 
 func (d *Driver) Create() error {
 	log.Infof("Creating SSH key...")
@@ -123,6 +155,9 @@ func (d *Driver) Create() error {
 		Name:              d.MachineName,
 		Region:            d.Region,
 		Size:              d.Size,
+		IPv6:              d.IPv6,
+		PrivateNetworking: d.PrivateNetworking,
+		Backups:           d.Backups,
 		SSHKeys:           []interface{}{d.SSHKeyID},
 	}