TF silently fails to set AWS tags

[feliksik]

Using the AWS provider, it seems that setting a tag with a a failed lookup() value prevents any tag from being set. I think we should receive an error here?

summary:

        # this would be good
        #Name = "${var.prefix} subnet ${ lookup(var.zones, count.index+1) }"

        # this silently fails so set the tags, because I forgot the .index in count
        Name = "${var.prefix} subnet ${ lookup(var.zones, count+1) }"
        Maintainer = "${var.maintainer}"

full tf file:

variable "aws_access_key" {}
variable "aws_secret_key" {}
variable "prefix" {}
variable "maintainer" {}

variable "az_count" { default = 3 }

variable "zones" {
    default = {
        "1" = "eu-west-1a"
        "2" = "eu-west-1b"
        "3" = "eu-west-1c"
    }
}

output "vpc_id" { value = "${aws_vpc.main.id}" }

output "subnet_ids" { 
        value = "${ join(\",\", aws_subnet.sdnet.*.id) }" 
}

provider "aws" {
    access_key = "${var.aws_access_key}"
    secret_key = "${var.aws_secret_key}"
    region = "eu-west-1"
}

resource "aws_vpc" "main" {
    cidr_block = "10.10.0.0/16"
    enable_dns_support = true
    enable_dns_hostnames = true
    tags {
        Name = "${var.prefix} vpc"
        Maintainer = "${var.maintainer}"
    }
}

resource "aws_internet_gateway" "main" {
    vpc_id = "${aws_vpc.main.id}"
    tags {
        Name = "${var.prefix} gateway"
        Maintainer = "${var.maintainer}"
    }
}

resource "aws_route_table" "main" {
    vpc_id = "${aws_vpc.main.id}"
    route {
        cidr_block = "0.0.0.0/0"
        gateway_id = "${aws_internet_gateway.main.id}"
    }
    tags {
        Name = "${var.prefix} route table"
        Maintainer = "${var.maintainer}"
    }
}

resource "aws_route_table_association" "main" {
    subnet_id = "${element(aws_subnet.sdnet.*.id, count.index)}"
    route_table_id = "${aws_route_table.main.id}"
}

resource "aws_subnet" "sdnet" {
    count = "${var.az_count}"
    vpc_id = "${aws_vpc.main.id}"
    availability_zone = "${ lookup(var.zones, count.index+1) }"
    cidr_block = "10.10.${count.index+1}.0/24"
    map_public_ip_on_launch = true
    tags {

        # this would be good
        #Name = "${var.prefix} subnet ${ lookup(var.zones, count.index+1) }"

        # this silently fails so set the tags
        Name = "${var.prefix} subnet ${ lookup(var.zones, count+1) }"
        Maintainer = "${var.maintainer}"
    }
}

[ghost]

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