Add new option, nvme_device_path, so that we can properly mount nvme block devices.

builder/amazon/chroot/builder.go

@@ -33,6 +33,7 @@ type Config struct {
 	CommandWrapper    string                     `mapstructure:"command_wrapper"`
 	CopyFiles         []string                   `mapstructure:"copy_files"`
 	DevicePath        string                     `mapstructure:"device_path"`
+	NVMEDevicePath    string                     `mapstructure:"nvme_device_path"`
 	FromScratch       bool                       `mapstructure:"from_scratch"`
 	MountOptions      []string                   `mapstructure:"mount_options"`
 	MountPartition    string                     `mapstructure:"mount_partition"`

builder/amazon/chroot/step_mount_device.go

@@ -35,6 +35,10 @@ func (s *StepMountDevice) Run(_ context.Context, state multistep.StateBag) multi
 	config := state.Get("config").(*Config)
 	ui := state.Get("ui").(packer.Ui)
 	device := state.Get("device").(string)
+	if config.NVMEDevicePath != "" {
+		// customizable device path for mounting NVME block devices on c5 and m5 HVM
+		device = config.NVMEDevicePath
+	}
 	wrappedCommand := state.Get("wrappedCommand").(CommandWrapper)
 
 	var virtualizationType string
@@ -47,6 +51,7 @@ func (s *StepMountDevice) Run(_ context.Context, state multistep.StateBag) multi
 	}
 
 	ctx := config.ctx
+
 	ctx.Data = &mountPathData{Device: filepath.Base(device)}
 	mountPath, err := interpolate.Render(config.MountPath, &ctx)
 
@@ -98,7 +103,7 @@ func (s *StepMountDevice) Run(_ context.Context, state multistep.StateBag) multi
 		ui.Error(err.Error())
 		return multistep.ActionHalt
 	}
-
+	log.Printf("[DEBUG] (step mount) mount command is %s", mountCommand)
 	cmd := ShellCommand(mountCommand)
 	cmd.Stderr = stderr
 	if err := cmd.Run(); err != nil {