Adds support for using the internal IP rather than NAT IP in GCE

builder/googlecompute/config.go

@@ -36,6 +36,7 @@ type Config struct {
 	RawSSHTimeout        string            `mapstructure:"ssh_timeout"`
 	RawStateTimeout      string            `mapstructure:"state_timeout"`
 	Tags                 []string          `mapstructure:"tags"`
+	UseInternalIP        bool              `mapstructure:"use_internal_ip"`
 	Zone                 string            `mapstructure:"zone"`
 
 	account         accountFile

builder/googlecompute/config_test.go

@@ -116,6 +116,21 @@ func TestConfigPrepare(t *testing.T) {
 			"5s",
 			false,
 		},
+		{
+			"use_internal_ip",
+			nil,
+			false,
+		},
+		{
+			"use_internal_ip",
+			false,
+			false,
+		},
+		{
+			"use_internal_ip",
+			"SO VERY BAD",
+			true,
+		},
 	}
 
 	for _, tc := range cases {

builder/googlecompute/driver.go

@@ -24,6 +24,9 @@ type Driver interface {
 	// GetNatIP gets the NAT IP address for the instance.
 	GetNatIP(zone, name string) (string, error)
 
+	// GetInternalIP gets the GCE-internal IP address for the instance.
+	GetInternalIP(zone, name string) (string, error)
+
 	// RunInstance takes the given config and launches an instance.
 	RunInstance(*InstanceConfig) (<-chan error, error)
 

builder/googlecompute/driver_gce.go

@@ -157,7 +157,6 @@ func (d *driverGCE) GetNatIP(zone, name string) (string, error) {
 		if ni.AccessConfigs == nil {
 			continue
 		}
-
 		for _, ac := range ni.AccessConfigs {
 			if ac.NatIP != "" {
 				return ac.NatIP, nil
@@ -168,6 +167,22 @@ func (d *driverGCE) GetNatIP(zone, name string) (string, error) {
 	return "", nil
 }
 
+func (d *driverGCE) GetInternalIP(zone, name string) (string, error) {
+	instance, err := d.service.Instances.Get(d.projectId, zone, name).Do()
+	if err != nil {
+		return "", err
+	}
+
+	for _, ni := range instance.NetworkInterfaces {
+		if ni.NetworkIP == "" {
+			continue
+		}
+		return ni.NetworkIP, nil
+	}
+
+	return "", nil
+}
+
 func (d *driverGCE) RunInstance(c *InstanceConfig) (<-chan error, error) {
 	// Get the zone
 	d.ui.Message(fmt.Sprintf("Loading zone: %s", c.Zone))

builder/googlecompute/driver_mock.go

@@ -30,6 +30,11 @@ type DriverMock struct {
 	GetNatIPResult string
 	GetNatIPErr    error
 
+	GetInternalIPZone   string
+	GetInternalIPName   string
+	GetInternalIPResult string
+	GetInternalIPErr    error
+
 	RunInstanceConfig *InstanceConfig
 	RunInstanceErrCh  <-chan error
 	RunInstanceErr    error
@@ -108,6 +113,12 @@ func (d *DriverMock) GetNatIP(zone, name string) (string, error) {
 	return d.GetNatIPResult, d.GetNatIPErr
 }
 
+func (d *DriverMock) GetInternalIP(zone, name string) (string, error) {
+	d.GetInternalIPZone = zone
+	d.GetInternalIPName = name
+	return d.GetInternalIPResult, d.GetInternalIPErr
+}
+
 func (d *DriverMock) RunInstance(c *InstanceConfig) (<-chan error, error) {
 	d.RunInstanceConfig = c
 

builder/googlecompute/ssh.go

@@ -1,9 +1,9 @@
 package googlecompute
 
 import (
-	"golang.org/x/crypto/ssh"
 	"fmt"
 	"github.com/mitchellh/multistep"
+	"golang.org/x/crypto/ssh"
 )
 
 // sshAddress returns the ssh address.

builder/googlecompute/step_instance_info.go

@@ -40,6 +40,24 @@ func (s *StepInstanceInfo) Run(state multistep.StateBag) multistep.StepAction {
 		return multistep.ActionHalt
 	}
 
+	if config.UseInternalIP {
+		ip, err := driver.GetInternalIP(config.Zone, instanceName)
+		if err != nil {
+			err := fmt.Errorf("Error retrieving instance internal ip address: %s", err)
+			state.Put("error", err)
+			ui.Error(err.Error())
+			return multistep.ActionHalt
+		}
+
+		if s.Debug {
+			if ip != "" {
+				ui.Message(fmt.Sprintf("Internal IP: %s", ip))
+			}
+		}
+		ui.Message(fmt.Sprintf("IP: %s", ip))
+		state.Put("instance_ip", ip)
+		return multistep.ActionContinue
+	} else {
 		ip, err := driver.GetNatIP(config.Zone, instanceName)
 		if err != nil {
 			err := fmt.Errorf("Error retrieving instance nat ip address: %s", err)
@@ -53,10 +71,10 @@ func (s *StepInstanceInfo) Run(state multistep.StateBag) multistep.StepAction {
 				ui.Message(fmt.Sprintf("Public IP: %s", ip))
 			}
 		}
-
 		ui.Message(fmt.Sprintf("IP: %s", ip))
 		state.Put("instance_ip", ip)
 		return multistep.ActionContinue
+	}
 }
 
 // Cleanup.

builder/googlecompute/step_instance_info_test.go

@@ -49,6 +49,46 @@ func TestStepInstanceInfo(t *testing.T) {
 	}
 }
 
+func TestStepInstanceInfo_InternalIP(t *testing.T) {
+	state := testState(t)
+	step := new(StepInstanceInfo)
+	defer step.Cleanup(state)
+
+	state.Put("instance_name", "foo")
+
+	config := state.Get("config").(*Config)
+	config.UseInternalIP = true
+	driver := state.Get("driver").(*DriverMock)
+	driver.GetNatIPResult = "1.2.3.4"
+	driver.GetInternalIPResult = "5.6.7.8"
+
+	// run the step
+	if action := step.Run(state); action != multistep.ActionContinue {
+		t.Fatalf("bad action: %#v", action)
+	}
+
+	// Verify state
+	if driver.WaitForInstanceState != "RUNNING" {
+		t.Fatalf("bad: %#v", driver.WaitForInstanceState)
+	}
+	if driver.WaitForInstanceZone != config.Zone {
+		t.Fatalf("bad: %#v", driver.WaitForInstanceZone)
+	}
+	if driver.WaitForInstanceName != "foo" {
+		t.Fatalf("bad: %#v", driver.WaitForInstanceName)
+	}
+
+	ipRaw, ok := state.GetOk("instance_ip")
+	if !ok {
+		t.Fatal("should have ip")
+	}
+	if ip, ok := ipRaw.(string); !ok {
+		t.Fatal("ip is not a string")
+	} else if ip != "5.6.7.8" {
+		t.Fatalf("bad ip: %s", ip)
+	}
+}
+
 func TestStepInstanceInfo_getNatIPError(t *testing.T) {
 	state := testState(t)
 	step := new(StepInstanceInfo)