Terraform: More complex, formatted, outputs with splats

[rodom]

Terraform Version

Terraform v0.7.0

Terraform Configuration Files

Assuming a base config as in issue #2821 and this output definition:

output "int_subnets" {
  value = ["Subnet with CIDR ${aws_subnet.int.*.cidr_block} is in availability zone ${aws_subnet.int.*.availability_zone}"]
}

Expected Behavior

I'd expect this to render as:

int_subnets = [
    Subnet with CIDR 10.0.0.0/24 is in availability zone eu-west-1a,
    Subnet with CIDR 10.0.1.0/24 is in availability zone eu-west-1b   
]

(this kind of thing can already be done in an output where splats/lists are not involved)

Actual Behavior

Nothing is output at all.

[phinze]

Hi @rodom - the formatlist() interpolation function should do what you want here.

An example:

resource "aws_vpc" "main" {
  cidr_block = "10.0.0.0/16"
}
resource "aws_subnet" "int" {
  count      = 3
  vpc_id     = "${aws_vpc.main.id}"
  cidr_block = "10.0.${count.index}.0/24"
}
output "list" {
  value = "${
    formatlist(
      "Subnet with CIDR %s is in availability zone %s",
      aws_subnet.int.*.cidr_block,
      aws_subnet.int.*.availability_zone
    )}"
}

Outputs:

list = [
    Subnet with CIDR 10.0.0.0/24 is in availability zone us-west-2b,
    Subnet with CIDR 10.0.1.0/24 is in availability zone us-west-2a,
    Subnet with CIDR 10.0.2.0/24 is in availability zone us-west-2a
]

[rodom]

Thanks @phinze that works. It's still not what I'd have expected to be consistent with the non-list case, but it works. As an aside, outputs should not silently fail when there's something wrong with them - is that being addressed?

[rodom]

I'll answer my own question :-) #5334.

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