make aws instsance builder work with recent changes for volume copy

builder/amazon/instance/builder.go

@@ -350,6 +350,7 @@ func (b *Builder) Run(ctx context.Context, ui packer.Ui, hook packer.Hook) (pack
 		&StepRegisterAMI{
 			EnableAMISriovNetSupport: b.config.AMISriovNetSupport,
 			EnableAMIENASupport:      b.config.AMIENASupport,
+			AMISkipBuildRegion:       b.config.AMISkipBuildRegion,
 		},
 		&awscommon.StepAMIRegionCopy{
 			AccessConfig:      &b.config.AccessConfig,

builder/amazon/instance/step_register_ami.go

@@ -7,6 +7,7 @@ import (
 	"github.com/aws/aws-sdk-go/aws"
 	"github.com/aws/aws-sdk-go/service/ec2"
 	awscommon "github.com/hashicorp/packer/builder/amazon/common"
+	"github.com/hashicorp/packer/common/random"
 	confighelper "github.com/hashicorp/packer/helper/config"
 	"github.com/hashicorp/packer/helper/multistep"
 	"github.com/hashicorp/packer/packer"
@@ -15,6 +16,7 @@ import (
 type StepRegisterAMI struct {
 	EnableAMIENASupport      confighelper.Trilean
 	EnableAMISriovNetSupport bool
+	AMISkipBuildRegion       bool
 }
 
 func (s *StepRegisterAMI) Run(ctx context.Context, state multistep.StateBag) multistep.StepAction {
@@ -24,9 +26,27 @@ func (s *StepRegisterAMI) Run(ctx context.Context, state multistep.StateBag) mul
 	ui := state.Get("ui").(packer.Ui)
 
 	ui.Say("Registering the AMI...")
+
+	// Create the image
+	amiName := config.AMIName
+	state.Put("intermediary_image", false)
+	if config.AMIEncryptBootVolume.True() || s.AMISkipBuildRegion {
+		state.Put("intermediary_image", true)
+
+		// From AWS SDK docs: You can encrypt a copy of an unencrypted snapshot,
+		// but you cannot use it to create an unencrypted copy of an encrypted
+		// snapshot. Your default CMK for EBS is used unless you specify a
+		// non-default key using KmsKeyId.
+
+		// If encrypt_boot is nil or true, we need to create a temporary image
+		// so that in step_region_copy, we can copy it with the correct
+		// encryption
+		amiName = random.AlphaNum(7)
+	}
+
 	registerOpts := &ec2.RegisterImageInput{
 		ImageLocation:       &manifestPath,
-		Name:                aws.String(config.AMIName),
+		Name:                aws.String(amiName),
 		BlockDeviceMappings: config.AMIMappings.BuildEC2BlockDeviceMappings(),
 	}