aws_subnet resoure (imported) with a count parameter fails

[BlaCatRu]

Hi there,

I've imported an existing aws subnets and the state looks right
$ terraform state list
module.ireland.aws_availability_zones.available
module.ireland.aws_subnet.net[0]
module.ireland.aws_subnet.net[1]
module.ireland.aws_subnet.net[2]
module.ireland.aws_vpc.main

On refreshing the state it looses zero index
$ terraform plan
...
aws_vpc.main: Refreshing state... (ID: vpc-VVVV)
data.aws_availability_zones.available: Refreshing state...
aws_subnet.net.2: Refreshing state... (ID: subnet-ZZZZ)
aws_subnet.net.1: Refreshing state... (ID: subnet-YYYY)
aws_subnet.net: Refreshing state... (ID: subnet-XXXX)

Terraform Version

Terraform Version: 0.9.1

Affected Resource(s)

• aws_subnet

Terraform Configuration Files

main.tf

module ireland {
  source = "modules/vpc"
  region = "eu-west-1"
}

modules/vpc/main.tf

variable "region" { type = "string" }
variable "vpc_name" { type = "string" default = "vpc" }
variable "group" { type = "string" default = "sys" }
variable "dnsnames" { type = "string" default = "true" }
variable "hostnames" { type = "string" default = "true" }
variable "public_ip" {type = "string" default = "true"}

variable "vpc_number" {
  # arbitrary mapping of region name to number to use in a VPC's CIDR prefix.
  default = {
    us-east-1      = 1 # nvirginia
    us-west-1      = 2 # ncalifornia
    us-west-2      = 3 # oregon
    eu-west-1      = 4 # ireland
    eu-central-1   = 5 # frankfurt
    sa-east-1      = 6 # saopaolo
    us-east-2      = 7 # ohio
    ap-southeast-1 = 8 # singapore
  }
}

provider "aws" {
  region = "${var.region}"
}

resource "aws_vpc" "main" {
    cidr_block = "${cidrsubnet("10.0.0.0/8", 8, var.vpc_number[var.region])}"
    enable_dns_support = "${var.dnsnames}"
    enable_dns_hostnames = "${var.hostnames}"
    tags {
        Name = "${var.vpc_name}${var.vpc_number[var.region]}"
        group = "${var.group}"
    }
}

data "aws_availability_zones" "available" {}

resource "aws_subnet" "net" {
  count = "${length(data.aws_availability_zones.available.names)}"
  vpc_id = "${aws_vpc.main.id}"
  availability_zone = "${data.aws_availability_zones.available.names[count.index]}"
  cidr_block = "${cidrsubnet("${aws_vpc.main.cidr_block}", 4, "${count.index}")}"
  map_public_ip_on_launch = "${var.public_ip}"
  tags {
    group = "${var.group}"
    Name = "${var.vpc_name}${var.vpc_number[var.region]}net${join("",slice(split("",data.aws_availability_zones.available.names[count.index]), length(var.region) - 1, length(var.region) + 1))}"
  }
}

Debug Output

https://gist.github.com/BlaCatRu/71c745b9d46d351690986f0c5f93639c

[ghost]

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