aws: move the OmitFromArtifact field in ebssurrogat where it's being used

also, simplified a bit the usage of block device

builder/amazon/chroot/block_device.go

@@ -65,13 +65,3 @@ func (bds BlockDevices) Prepare(ctx *interpolate.Context) (errs []error) {
 	}
 	return errs
 }
-
-func (b BlockDevices) GetOmissions() map[string]bool {
-	omitMap := make(map[string]bool)
-
-	for _, blockDevice := range b {
-		omitMap[blockDevice.DeviceName] = blockDevice.OmitFromArtifact
-	}
-
-	return omitMap
-}

builder/amazon/common/block_device.go

@@ -44,8 +44,6 @@ type BlockDevice struct {
 	// The size of the volume, in GiB. Required if not specifying a
 	// snapshot_id.
 	VolumeSize int64 `mapstructure:"volume_size" required:"false"`
-	// ebssurrogate only
-	OmitFromArtifact bool `mapstructure:"omit_from_artifact"`
 }
 
 type BlockDevices []BlockDevice
@@ -120,13 +118,3 @@ func (bds BlockDevices) Prepare(ctx *interpolate.Context) (errs []error) {
 	}
 	return errs
 }
-
-func (b BlockDevices) GetOmissions() map[string]bool {
-	omitMap := make(map[string]bool)
-
-	for _, blockDevice := range b {
-		omitMap[blockDevice.DeviceName] = blockDevice.OmitFromArtifact
-	}
-
-	return omitMap
-}

builder/amazon/common/step_run_source_instance.go

@@ -21,7 +21,7 @@ import (
 
 type StepRunSourceInstance struct {
 	AssociatePublicIpAddress          bool
-	LaunchMappings                    BlockDevices
+	LaunchMappings                    EC2BlockDeviceMappingsBuilder
 	Comm                              *communicator.Config
 	Ctx                               interpolate.Context
 	Debug                             bool

builder/amazon/common/step_run_spot_instance.go

@@ -21,9 +21,13 @@ import (
 	"github.com/hashicorp/packer/template/interpolate"
 )
 
+type EC2BlockDeviceMappingsBuilder interface {
+	BuildEC2BlockDeviceMappings() []*ec2.BlockDeviceMapping
+}
+
 type StepRunSpotInstance struct {
 	AssociatePublicIpAddress          bool
-	LaunchMappings                    BlockDevices
+	LaunchMappings                    EC2BlockDeviceMappingsBuilder
 	BlockDurationMinutes              int64
 	Debug                             bool
 	Comm                              *communicator.Config

builder/amazon/common/step_run_spot_instance_test.go

@@ -82,7 +82,7 @@ func tStateSpot() multistep.StateBag {
 func getBasicStep() *StepRunSpotInstance {
 	stepRunSpotInstance := StepRunSpotInstance{
 		AssociatePublicIpAddress: false,
-		LaunchMappings:           []BlockDevice(nil),
+		LaunchMappings:           BlockDevices{},
 		BlockDurationMinutes:     0,
 		Debug:                    false,
 		Comm: &communicator.Config{

builder/amazon/ebssurrogate/block_device.go

@@ -0,0 +1,111 @@
+//go:generate struct-markdown
+
+package ebssurrogate
+
+import (
+	"fmt"
+	"strings"
+
+	"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/template/interpolate"
+)
+
+type BlockDevice struct {
+	awscommon.BlockDevice `mapstructure:",squash"`
+
+	// ebssurrogate only
+	OmitFromArtifact bool `mapstructure:"omit_from_artifact"`
+}
+
+type BlockDevices []BlockDevice
+
+func (bds BlockDevices) Common() []awscommon.BlockDevice {
+	res := []awscommon.BlockDevice{}
+	for _, bd := range bds {
+		res = append(res, bd.BlockDevice)
+	} 
+	return res
+}
+
+func (bds BlockDevices) BuildEC2BlockDeviceMappings() []*ec2.BlockDeviceMapping {
+	var blockDevices []*ec2.BlockDeviceMapping
+
+	for _, blockDevice := range bds {
+		blockDevices = append(blockDevices, blockDevice.BuildEC2BlockDeviceMapping())
+	}
+	return blockDevices
+}
+
+func (blockDevice BlockDevice) BuildEC2BlockDeviceMapping() *ec2.BlockDeviceMapping {
+
+	mapping := &ec2.BlockDeviceMapping{
+		DeviceName: aws.String(blockDevice.DeviceName),
+	}
+
+	if blockDevice.NoDevice {
+		mapping.NoDevice = aws.String("")
+		return mapping
+	} else if blockDevice.VirtualName != "" {
+		if strings.HasPrefix(blockDevice.VirtualName, "ephemeral") {
+			mapping.VirtualName = aws.String(blockDevice.VirtualName)
+		}
+		return mapping
+	}
+
+	ebsBlockDevice := &ec2.EbsBlockDevice{
+		DeleteOnTermination: aws.Bool(blockDevice.DeleteOnTermination),
+	}
+
+	if blockDevice.VolumeType != "" {
+		ebsBlockDevice.VolumeType = aws.String(blockDevice.VolumeType)
+	}
+
+	if blockDevice.VolumeSize > 0 {
+		ebsBlockDevice.VolumeSize = aws.Int64(blockDevice.VolumeSize)
+	}
+
+	// IOPS is only valid for io1 type
+	if blockDevice.VolumeType == "io1" {
+		ebsBlockDevice.Iops = aws.Int64(blockDevice.IOPS)
+	}
+
+	// You cannot specify Encrypted if you specify a Snapshot ID
+	if blockDevice.SnapshotId != "" {
+		ebsBlockDevice.SnapshotId = aws.String(blockDevice.SnapshotId)
+	}
+	ebsBlockDevice.Encrypted = blockDevice.Encrypted
+
+	mapping.Ebs = ebsBlockDevice
+
+	return mapping
+}
+
+func (b *BlockDevice) Prepare(ctx *interpolate.Context) error {
+	if b.DeviceName == "" {
+		return fmt.Errorf("The `device_name` must be specified " +
+			"for every device in the block device mapping.")
+	}
+
+	return nil
+}
+
+func (bds BlockDevices) Prepare(ctx *interpolate.Context) (errs []error) {
+	for _, block := range bds {
+		if err := block.Prepare(ctx); err != nil {
+			errs = append(errs, err)
+		}
+	}
+	return errs
+}
+
+func (b BlockDevices) GetOmissions() map[string]bool {
+	omitMap := make(map[string]bool)
+
+	for _, blockDevice := range b {
+		omitMap[blockDevice.DeviceName] = blockDevice.OmitFromArtifact
+	}
+
+	return omitMap
+}

builder/amazon/ebssurrogate/builder.go

@@ -26,7 +26,7 @@ type Config struct {
 	awscommon.AccessConfig `mapstructure:",squash"`
 	awscommon.RunConfig    `mapstructure:",squash"`
 	AMIMappings            awscommon.BlockDevices `mapstructure:"ami_block_device_mappings" required:"false"`
-	LaunchMappings         awscommon.BlockDevices `mapstructure:"launch_block_device_mappings" required:"false"`
+	LaunchMappings         BlockDevices           `mapstructure:"launch_block_device_mappings" required:"false"`
 	awscommon.AMIConfig    `mapstructure:",squash"`
 	// A block device mapping describing the root device of the AMI. This looks
 	// like the mappings in `ami_block_device_mapping`, except with an
@@ -235,7 +235,7 @@ func (b *Builder) Run(ctx context.Context, ui packer.Ui, hook packer.Hook) (pack
 			TemporarySGSourceCidrs: b.config.TemporarySGSourceCidrs,
 		},
 		&awscommon.StepCleanupVolumes{
-			LaunchMappings: b.config.LaunchMappings,
+			LaunchMappings: b.config.LaunchMappings.Common(),
 		},
 		instanceStep,
 		&awscommon.StepGetPassword{

builder/amazon/ebsvolume/block_device.go

@@ -3,28 +3,47 @@
 package ebsvolume
 
 import (
+	"github.com/aws/aws-sdk-go/service/ec2"
 	awscommon "github.com/hashicorp/packer/builder/amazon/common"
 	"github.com/hashicorp/packer/template/interpolate"
 )
 
 type BlockDevice struct {
-	awscommon.BlockDevice `mapstructure:"-,squash"`
+	awscommon.BlockDevice `mapstructure:",squash"`
+
+	OmitFromArtifact bool `mapstructure:"omit_from_artifact"`
 	// Tags applied to the AMI. This is a
 	// template engine, see Build template
 	// data for more information.
 	Tags awscommon.TagMap `mapstructure:"tags" required:"false"`
 }
 
-func commonBlockDevices(mappings []BlockDevice, ctx *interpolate.Context) (awscommon.BlockDevices, error) {
-	result := make([]awscommon.BlockDevice, len(mappings))
+type BlockDevices []BlockDevice
 
-	for i, mapping := range mappings {
-		interpolateBlockDev, err := interpolate.RenderInterface(&mapping.BlockDevice, ctx)
-		if err != nil {
-			return awscommon.BlockDevices{}, err
+func (bds BlockDevices) BuildEC2BlockDeviceMappings() []*ec2.BlockDeviceMapping {
+	var blockDevices []*ec2.BlockDeviceMapping
+
+	for _, blockDevice := range bds {
+		blockDevices = append(blockDevices, blockDevice.BuildEC2BlockDeviceMapping())
+	}
+	return blockDevices
+}
+
+func (bds BlockDevices) Prepare(ctx *interpolate.Context) (errs []error) {
+	for _, block := range bds {
+		if err := block.Prepare(ctx); err != nil {
+			errs = append(errs, err)
 		}
-		result[i] = *interpolateBlockDev.(*awscommon.BlockDevice)
+	}
+	return errs
+}
+
+func (b BlockDevices) GetOmissions() map[string]bool {
+	omitMap := make(map[string]bool)
+
+	for _, blockDevice := range b {
+		omitMap[blockDevice.DeviceName] = blockDevice.OmitFromArtifact
 	}
 
-	return result, nil
+	return omitMap
 }

builder/amazon/ebsvolume/builder.go

@@ -1,7 +1,7 @@
 //go:generate struct-markdown
 
-// The ebsvolume package contains a packer.Builder implementation that
-// builds EBS volumes for Amazon EC2 using an ephemeral instance,
+// The ebsvolume package contains a packer.Builder implementation that builds
+// EBS volumes for Amazon EC2 using an ephemeral instance,
 package ebsvolume
 
 import (
@@ -24,9 +24,9 @@ type Config struct {
 	common.PackerConfig    `mapstructure:",squash"`
 	awscommon.AccessConfig `mapstructure:",squash"`
 	awscommon.RunConfig    `mapstructure:",squash"`
-	// Add the block device
-	// mappings to the AMI. The block device mappings allow for keys:
-	VolumeMappings []BlockDevice `mapstructure:"ebs_volumes" required:"false"`
+	// Add the block device mappings to the AMI. The block device mappings
+	// allow for keys:
+	VolumeMappings BlockDevices `mapstructure:"ebs_volumes" required:"false"`
 	// Enable enhanced networking (ENA but not SriovNetSupport) on
 	// HVM-compatible AMIs. If set, add ec2:ModifyInstanceAttribute to your AWS
 	// IAM policy. If false, this will disable enhanced networking in the final
@@ -42,7 +42,7 @@ type Config struct {
 	// Default `false`.
 	AMISriovNetSupport bool `mapstructure:"sriov_support" required:"false"`
 
-	launchBlockDevices awscommon.BlockDevices
+	launchBlockDevices BlockDevices
 	ctx                interpolate.Context
 }
 
@@ -84,7 +84,7 @@ func (b *Builder) Prepare(raws ...interface{}) ([]string, error) {
 		}
 	}
 
-	b.config.launchBlockDevices, err = commonBlockDevices(b.config.VolumeMappings, &b.config.ctx)
+	b.config.launchBlockDevices = b.config.VolumeMappings
 	if err != nil {
 		errs = packer.MultiErrorAppend(errs, err)
 	}