builder/amazon: output DNS name if debug mode

CHANGELOG.md

@@ -4,6 +4,7 @@ IMPROVEMENTS:
 
 * builder/amazon: In `-debug` mode, the keypair used will be saved to
   the current directory so you can access the machine. [GH-373]
+* builder/amazon: In `-debug` mode, the DNS is outputted.
 
 BUG FIXES:
 

builder/amazon/common/step_run_source_instance.go

@@ -10,6 +10,7 @@ import (
 )
 
 type StepRunSourceInstance struct {
+	Debug              bool
 	ExpectedRootDevice string
 	InstanceType       string
 	UserData           string
@@ -100,6 +101,17 @@ func (s *StepRunSourceInstance) Run(state map[string]interface{}) multistep.Step
 	}
 
 	s.instance = latestInstance.(*ec2.Instance)
+
+	if s.Debug {
+		if s.instance.DNSName != "" {
+			ui.Message(fmt.Sprintf("Public DNS: %s", s.instance.DNSName))
+		}
+
+		if s.instance.PrivateIpAddress != "" {
+			ui.Message(fmt.Sprintf("Private IP: %s", s.instance.PrivateIpAddress))
+		}
+	}
+
 	state["instance"] = s.instance
 
 	return multistep.ActionContinue

builder/amazon/ebs/builder.go

@@ -91,6 +91,7 @@ func (b *Builder) Run(ui packer.Ui, hook packer.Hook, cache packer.Cache) (packe
 			VpcId:           b.config.VpcId,
 		},
 		&awscommon.StepRunSourceInstance{
+			Debug:              b.config.PackerDebug,
 			ExpectedRootDevice: "ebs",
 			InstanceType:       b.config.InstanceType,
 			UserData:           b.config.UserData,

builder/amazon/instance/builder.go

@@ -194,6 +194,7 @@ func (b *Builder) Run(ui packer.Ui, hook packer.Hook, cache packer.Cache) (packe
 			VpcId:           b.config.VpcId,
 		},
 		&awscommon.StepRunSourceInstance{
+			Debug:              b.config.PackerDebug,
 			ExpectedRootDevice: "instance-store",
 			InstanceType:       b.config.InstanceType,
 			IamInstanceProfile: b.config.IamInstanceProfile,