builder/null: adopt helper/communicator

builder/null/builder.go

 package null
 
 import (
+	"log"
+
 	"github.com/mitchellh/multistep"
 	"github.com/mitchellh/packer/common"
+	"github.com/mitchellh/packer/helper/communicator"
 	"github.com/mitchellh/packer/packer"
-	"log"
-	"time"
 )
 
 const BuilderId = "fnoeding.null"
@@ -27,10 +28,14 @@ func (b *Builder) Prepare(raws ...interface{}) ([]string, error) {
 
 func (b *Builder) Run(ui packer.Ui, hook packer.Hook, cache packer.Cache) (packer.Artifact, error) {
 	steps := []multistep.Step{
-		&common.StepConnectSSH{
-			SSHAddress:     SSHAddress(b.config.Host, b.config.Port),
-			SSHConfig:      SSHConfig(b.config.SSHUsername, b.config.SSHPassword, b.config.SSHPrivateKeyFile),
-			SSHWaitTimeout: 1 * time.Minute,
+		&communicator.StepConnect{
+			Config: &b.config.CommConfig,
+			SSHAddress: SSHAddress(
+				b.config.CommConfig.SSHHost, b.config.CommConfig.SSHPort),
+			SSHConfig: SSHConfig(
+				b.config.CommConfig.SSHUsername,
+				b.config.CommConfig.SSHPassword,
+				b.config.CommConfig.SSHPrivateKey),
 		},
 		&common.StepProvision{},
 	}

builder/null/config.go

@@ -4,6 +4,7 @@ import (
 	"fmt"
 
 	"github.com/mitchellh/packer/common"
+	"github.com/mitchellh/packer/helper/communicator"
 	"github.com/mitchellh/packer/helper/config"
 	"github.com/mitchellh/packer/packer"
 	"github.com/mitchellh/packer/template/interpolate"
@@ -12,11 +13,7 @@ import (
 type Config struct {
 	common.PackerConfig `mapstructure:",squash"`
 
-	Host              string `mapstructure:"host"`
-	Port              int    `mapstructure:"port"`
-	SSHUsername       string `mapstructure:"ssh_username"`
-	SSHPassword       string `mapstructure:"ssh_password"`
-	SSHPrivateKeyFile string `mapstructure:"ssh_private_key_file"`
+	CommConfig communicator.Config `mapstructure:",squash"`
 }
 
 func NewConfig(raws ...interface{}) (*Config, []string, error) {
@@ -24,37 +21,32 @@ func NewConfig(raws ...interface{}) (*Config, []string, error) {
 
 	err := config.Decode(&c, &config.DecodeOpts{
 		Interpolate:       true,
-		InterpolateFilter: &interpolate.RenderFilter{
-			Exclude: []string{
-				"run_command",
-			},
-		},
+		InterpolateFilter: &interpolate.RenderFilter{},
 	}, raws...)
 	if err != nil {
 		return nil, nil, err
 	}
 
-	if c.Port == 0 {
-		c.Port = 22
-	}
-
 	var errs *packer.MultiError
-	if c.Host == "" {
+	if es := c.CommConfig.Prepare(nil); len(es) > 0 {
+		errs = packer.MultiErrorAppend(errs, es...)
+	}
+	if c.CommConfig.SSHHost == "" {
 		errs = packer.MultiErrorAppend(errs,
 			fmt.Errorf("host must be specified"))
 	}
 
-	if c.SSHUsername == "" {
+	if c.CommConfig.SSHUsername == "" {
 		errs = packer.MultiErrorAppend(errs,
 			fmt.Errorf("ssh_username must be specified"))
 	}
 
-	if c.SSHPassword == "" && c.SSHPrivateKeyFile == "" {
+	if c.CommConfig.SSHPassword == "" && c.CommConfig.SSHPrivateKey == "" {
 		errs = packer.MultiErrorAppend(errs,
 			fmt.Errorf("one of ssh_password and ssh_private_key_file must be specified"))
 	}
 
-	if c.SSHPassword != "" && c.SSHPrivateKeyFile != "" {
+	if c.CommConfig.SSHPassword != "" && c.CommConfig.SSHPrivateKey != "" {
 		errs = packer.MultiErrorAppend(errs,
 			fmt.Errorf("only one of ssh_password and ssh_private_key_file must be specified"))
 	}

builder/null/config_test.go

@@ -6,7 +6,7 @@ import (
 
 func testConfig() map[string]interface{} {
 	return map[string]interface{}{
-		"host":         "foo",
+		"ssh_host":     "foo",
 		"ssh_username": "bar",
 		"ssh_password": "baz",
 	}
@@ -48,8 +48,8 @@ func TestConfigPrepare_port(t *testing.T) {
 	// default port should be 22
 	delete(raw, "port")
 	c, warns, errs := NewConfig(raw)
-	if c.Port != 22 {
-		t.Fatalf("bad: port should default to 22, not %d", c.Port)
+	if c.CommConfig.SSHPort != 22 {
+		t.Fatalf("bad: port should default to 22, not %d", c.CommConfig.SSHPort)
 	}
 	testConfigOk(t, warns, errs)
 }
@@ -58,12 +58,12 @@ func TestConfigPrepare_host(t *testing.T) {
 	raw := testConfig()
 
 	// No host
-	delete(raw, "host")
+	delete(raw, "ssh_host")
 	_, warns, errs := NewConfig(raw)
 	testConfigErr(t, warns, errs)
 
 	// Good host
-	raw["host"] = "good"
+	raw["ssh_host"] = "good"
 	_, warns, errs = NewConfig(raw)
 	testConfigOk(t, warns, errs)
 }