This will allow to generate the config files:

```go
package main

import (
	"fmt"

	"github.com/hashicorp/hcl/v2/gohcl"
	"github.com/hashicorp/hcl/v2/hclwrite"
	"github.com/hashicorp/packer/builder/alicloud/ecs"
)

func main() {
	name := "name"
	app := ecs.FlatConfig{
		AlicloudImageName: &name,
		ECSSystemDiskMapping: &ecs.FlatAlicloudDiskDevice{
			DiskName: &name,
		},
	}

	f := hclwrite.NewEmptyFile()
	block := gohcl.EncodeAsBlock(&app, `source "something" "something"`)
	f.Body().AppendBlock(block)
	fmt.Printf("%s", f.Bytes())
}

```

Will output:

```
source "something" "something" {
  packer_user_variables      = null
  packer_sensitive_variables = null
  image_name                 = "name"
  image_share_account        = null
  image_unshare_account      = null
  image_copy_regions         = null
  image_copy_names           = null
  tags                       = null
  tag                        = null
 ...