HCL2 and optional section

[Dan Linder]

I'd like to present a single HCL2 Packer template to build some systems but I need to vary the number of "storage {}" sections, only provisioning a second disk if the "disk_size" setting for the second one is "> 0".

Does HCL2 have any "if" clauses, or if not is there a way using HCL2 to do this, or do I need to re-write my calling script to modify the HCL2 file before sending it to Packer?

Example:

I define the variables "root_disk_size" and "additional_disk_size", and the builder section has two "storage {}" sections:

storage {
  disk_size = var.root_disk_size

}

storage {
   disk_size = var.additional_disk_size

}

Is it possible to wrap the second section in a test something like "if var.additional_disk_size > 0"?

[Megan Marsh]

I think you should be able to do something like this:

```
variable "disk_size1" {
  default = 24
  type = number
}

variable "disk_size2" {
  default = 0
  type = number
}

locals {

  // use the ternary operator to define the storage elements

  storage = var.disk_size2 > 0 ? [var.disk_size1, var.disk_size2] : [var.disk_size1]
}

source "vsphere-iso" "basic-ubuntu" {

    // use a dynamic block to create the storage blocks based off your storage variable

    dynamic "storage" {
      for_each = local.storage

      content {
        disk_size = storage.value
      }
    }

```

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