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imbriaco/01-main.tf

Last active June 8, 2016 22:16
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I'll take stupid Terraform tricks for $500, Alex
Raw
01-main.tf
module "my_instance" {
source = "../path/to/crazy_module.tf"
...
count = 1
include_eip = "true"
}
Raw
02-crazy_module.tf
resource "aws_instance" "instance" {
...
count = "${var.count}"
}
resource "aws_eip" "instance" {
depends_on = [ "aws_security_group.instance" ]
count = "${replace(replace(var.include_eip, "/\\Atrue\\z/", "1"), "/\\A[^1].*\\z/", "0") * var.count}"
}
resource "aws_eip_association" "instance" {
instance_id = "${element(aws_instance.instance.*.id, count.index)}"
allocation_id = "${element(aws_eip.instance.*.id, count.index)}"
count = "${replace(replace(var.include_eip, "/\\Atrue\\z/", "1"), "/\\A[^1].*\\z/", "0") * var.count}"
depends_on = ["aws_eip.instance"]
}
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imbriaco commented Jun 8, 2016

@jc-asdf: Hah! I almost did something like that too. The reason I didn't was that I didn't want to have to define that truefalse map in every module that used my hacky conditional logic, even though I think your approach is a little more readable. :)

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