Terraform 0.12.0 conditional blocks

[Andrey Tuzhilin]

Hi!

With terraform out it is now easy to make dynamic blocks. But what if I want to make a conditional block. E.g.: I have a module with bool variable:

variable "ext_ip" {
  default = false
  type    = bool
  description = "assign external ip to the instance"
}

Now I need to add an empty block to resource config depending on its value:

resource "google_compute_instance" "vm" {
  network_interface {
    access_config {} // <- this block is optional
  }
}

The I came out with two ways of doing (both are ugly as hell):

resource "google_compute_instance" "vm" {
  network_interface {
    dynamic "access_config" {
      for_each = var.ext_ip ? [""] : []
      content {}
    }
  }
}

resource "google_compute_instance" "vm" {
  network_interface {
    dynamic "access_config" {
      for_each = [""]
      content {}
      if var.ext_ip
    }
  }
}

Is there any other non-ugly way?

[Stuart Clark]

On 31/05/2019 16:22, Andrey Tuzhilin wrote:

Hi!

With terraform out it is now easy to make dynamic blocks. But what if I want to make a conditional block. E.g.: I have a module with bool variable:

variable "ext_ip" {
  default = false
  type    = bool
  description = "assign external ip to the instance"
}

Now I need to add an empty block to resource config depending on its value:

resource "google_compute_instance" "vm" {
  network_interface {
    access_config {} // <- this block is optional
  }
}
The I came out with two ways of doing (both are ugly as hell):
resource "google_compute_instance" "vm" {
  network_interface {
    dynamic "access_config" {
      for_each = var.ext_ip ? [""] : []
      content {}
    }
  }
}

I posted something similar a few days ago as did someone else. This one (above) is the one we've gone with

resource "google_compute_instance" "vm" {
  network_interface {
    dynamic "access_config" {
      for_each = [""]
      content {}
      if var.ext_ip
    }
  }
}

Is there any other non-ugly way?

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Stuart Clark