virtualbox: virtualbox-hostonly-no-dhcp flag to avoid creation of the dhcp server

Signed-off-by: Alessandro Siragusa <alessandro.siragusa@gmail.com>

drivers/virtualbox/network.go

@@ -286,7 +286,7 @@ func addHostOnlyDHCPServer(ifname string, d dhcpServer, vbox VBoxManager) error
 	command := "add"
 	if dhcp, ok := dhcps[name]; ok {
 		command = "modify"
-		if (dhcp.IPv4.IP.Equal(d.IPv4.IP)) && (dhcp.IPv4.Mask.String() == d.IPv4.Mask.String()) && (dhcp.LowerIP.Equal(d.LowerIP)) && (dhcp.UpperIP.Equal(d.UpperIP)) && dhcp.Enabled {
+		if (dhcp.IPv4.IP.Equal(d.IPv4.IP)) && (dhcp.IPv4.Mask.String() == d.IPv4.Mask.String()) && (dhcp.LowerIP.Equal(d.LowerIP)) && (dhcp.UpperIP.Equal(d.UpperIP)) && (dhcp.Enabled == d.Enabled) {
 			// dhcp is up to date
 			return nil
 		}

drivers/virtualbox/virtualbox.go

@@ -29,6 +29,7 @@ const (
 	defaultHostOnlyNictype     = "82540EM"
 	defaultHostOnlyPromiscMode = "deny"
 	defaultUIType              = "headless"
+	defaultHostOnlyNoDHCP      = false
 	defaultDiskSize            = 20000
 	defaultDNSProxy            = true
 	defaultDNSResolver         = false
@@ -64,6 +65,7 @@ type Driver struct {
 	HostOnlyNicType     string
 	HostOnlyPromiscMode string
 	UIType              string
+	HostOnlyNoDHCP      bool
 	NoShare             bool
 	DNSProxy            bool
 	NoVTXCheck          bool
@@ -89,6 +91,7 @@ func NewDriver(hostName, storePath string) *Driver {
 		HostOnlyNicType:     defaultHostOnlyNictype,
 		HostOnlyPromiscMode: defaultHostOnlyPromiscMode,
 		UIType:              defaultUIType,
+		HostOnlyNoDHCP:      defaultHostOnlyNoDHCP,
 		DNSProxy:            defaultDNSProxy,
 		HostDNSResolver:     defaultDNSResolver,
 		BaseDriver: &drivers.BaseDriver{
@@ -167,6 +170,11 @@ func (d *Driver) GetCreateFlags() []mcnflag.Flag {
 			Value:  defaultUIType,
 			EnvVar: "VIRTUALBOX_UI_TYPE",
 		},
+		mcnflag.BoolFlag{
+			Name:   "virtualbox-hostonly-no-dhcp",
+			Usage:  "Disable the Host Only DHCP Server",
+			EnvVar: "VIRTUALBOX_HOSTONLY_NO_DHCP",
+		},
 		mcnflag.BoolFlag{
 			Name:   "virtualbox-no-share",
 			Usage:  "Disable the mount of your home directory",
@@ -230,6 +238,7 @@ func (d *Driver) SetConfigFromFlags(flags drivers.DriverOptions) error {
 	d.HostOnlyNicType = flags.String("virtualbox-hostonly-nictype")
 	d.HostOnlyPromiscMode = flags.String("virtualbox-hostonly-nicpromisc")
 	d.UIType = flags.String("virtualbox-ui-type")
+	d.HostOnlyNoDHCP = flags.Bool("virtualbox-hostonly-no-dhcp")
 	d.NoShare = flags.Bool("virtualbox-no-share")
 	d.DNSProxy = !flags.Bool("virtualbox-no-dns-proxy")
 	d.NoVTXCheck = flags.Bool("virtualbox-no-vtx-check")
@@ -832,7 +841,7 @@ func (d *Driver) setupHostOnlyNetwork(machineName string) (*hostOnlyNetwork, err
 	dhcp.IPv4.Mask = network.Mask
 	dhcp.LowerIP = net.IPv4(nAddr[0], nAddr[1], nAddr[2], byte(100))
 	dhcp.UpperIP = net.IPv4(nAddr[0], nAddr[1], nAddr[2], byte(254))
-	dhcp.Enabled = true
+	dhcp.Enabled = !d.HostOnlyNoDHCP
 	if err := addHostOnlyDHCPServer(hostOnlyAdapter.Name, dhcp, d.VBoxManager); err != nil {
 		return nil, err
 	}