Use nested loops with count

[Vikas Kumar]

Hey All,

I am trying to use a nested loop in terraform. I have two list variables list_of_allowed_accountsand list_of_images, and looking to iterate over list list_of_images and then iterate over list list_of_allowed_accounts.

Here is my terraform code.

variable "list_of_allowed_accounts" {
  type    = "list"
  default = ["111111111", "2222222"]
}

variable "list_of_images" {
  type    = "list"
  default = ["alpine", "java", "jenkins"]
}

data "template_file" "ecr_policy_allowed_accounts" {
  template = "${file("${path.module}/ecr_policy.tpl")}"
  vars {
    count = "${length(var.list_of_allowed_accounts)}"
    account_id = "${element(var.list_of_allowed_accounts, count.index)}"
  }
}

resource "aws_ecr_repository_policy" "repo_policy_allowed_accounts" {
  count = "${length(var.list_of_images)}"
  repository = "${element(aws_ecr_repository.images.*.id, count.index)}"
  count = "${length(var.list_of_allowed_accounts)}"
  policy = "${data.template_file.ecr_policy_allowed_accounts.rendered}"
}

This is a bash equivalent of what I am trying to do.

for image in alpine java jenkins
do
  for account_id in 111111111 2222222
  do
    // call template here using variable 'account_id' and 'image'
  done
done

Thanks for your time here.

Cheers,

Vikas

[Brian Lalor]

I don't believe this is possible directly. I think you can accomplish that with an external data source that combines the variables, however. https://www.terraform.io/docs/providers/external/data_source.html

--

Brian Lalor

bla...@bravo5.org

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[Vikas Kumar]

Thanks Brian, trying that out. 

- Vikas

[Vikas Kumar]

Hey Brian,

I did tried this, but list variable is not accepted in external data source. I have raised a feature request for the same.

- Vikas

[Brian Lalor]

You can use join and split. And you also cannot use a computed value for count. :-(

-- 
Brian Lalor
bla...@bravo5.org

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[Vikas Kumar]

Thanks Brian, join worked.