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feat: add an example explaining how to use outputs of stacks using data sources
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‎04-terraform-data-source-across-stacks/config.tm.hcl

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globals "terraform" {
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version = "1.6.6"
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}
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globals "terraform" "backend" {
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bucket = "terramate-example-terraform-state-backend"
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region = "us-east-1"
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}

‎04-terraform-data-source-across-stacks/imports.tm.hcl

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import {
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source = "./imports/*.tm.hcl"
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}

‎04-terraform-data-source-across-stacks/imports/backend.tm.hcl

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generate_hcl "backend.tf" {
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content {
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terraform {
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backend "s3" {
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region = global.terraform.backend.region
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bucket = global.terraform.backend.bucket
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key = "terraform/stacks/by-id/${terramate.stack.id}/terraform.tfstate"
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encrypt = true
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dynamodb_table = tm_try(global.terraform.backend.dynamo_table, "terraform-lock")
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}
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}
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}
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}

‎04-terraform-data-source-across-stacks/imports/ec2.tm.hcl

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generate_hcl "ec2.tf" {
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stack_filter {
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project_paths = [
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"ec2/*"
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]
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}
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content {
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resource "aws_instance" "web" {
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instance_type = "t3.micro"
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ami = data.aws_ami.ubuntu.id
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subnet_id = data.aws_subnet.subnet.id
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# subnet_id = data.terraform_remote_state.vpc.outputs.subnet_id
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tags = {
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Name = terramate.stack.path.basename
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}
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}
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# data "terraform_remote_state" "vpc" {
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# backend = "s3"
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# config = {
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# bucket = global.terraform.backend.bucket
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# region = global.terraform.backend.region
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# encrypt = true
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# # The key here uses the stack ID of the VPC stack
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# key = "terraform/stacks/by-id/fedcfb3-ce64-4ba2-bc1e-1ab22bceba35/terraform.tfstate"
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# }
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# depends_on = [
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# null_resource.initial_deployment_trigger
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# ]
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# }
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data "aws_subnet" "subnet" {
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filter {
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name = "tag:Name"
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values = ["${global.terraform.backend.region}a"]
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}
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depends_on = [
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null_resource.initial_deployment_trigger
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]
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}
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resource "null_resource" "initial_deployment_trigger" {
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}
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data "aws_ami" "ubuntu" {
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most_recent = true
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filter {
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name = "name"
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values = ["ubuntu/images/hvm-ssd/ubuntu-jammy-22.04-amd64-server-*"]
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}
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filter {
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name = "virtualization-type"
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values = ["hvm"]
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}
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owners = ["099720109477"] # Canonical
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}
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}
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}

‎04-terraform-data-source-across-stacks/imports/terraform.tm.hcl

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generate_hcl "terraform.tf" {
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lets {
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required_providers = { for k, v in tm_try(global.terraform.providers, {}) :
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k => {
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source = v.source
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version = v.version
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} if tm_alltrue([
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tm_try(v.enabled, true),
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tm_length(tm_split(".", k)) == 1,
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])
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}
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providers = { for k, v in tm_try(global.terraform.providers, {}) :
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k => v.config if tm_alltrue([
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tm_length(tm_split(".", k)) == 1,
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tm_try(v.enabled, true),
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tm_can(v.config)
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])
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}
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providers_aliases = { for k, v in tm_try(global.terraform.providers, {}) :
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k => v.config if tm_alltrue([
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tm_length(tm_split(".", k)) == 2,
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tm_try(v.enabled, true),
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tm_can(v.config)
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])
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}
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}
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content {
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# terraform version constraints
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terraform {
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required_version = tm_try(global.terraform.version, "~> 1.6")
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}
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# Provider version constraints
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terraform {
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tm_dynamic "required_providers" {
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attributes = let.required_providers
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}
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}
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# Provider configs
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tm_dynamic "provider" {
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for_each = let.providers
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labels = [provider.key]
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attributes = provider.value
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}
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# Provider aliases
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tm_dynamic "provider" {
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for_each = let.providers_aliases
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labels = [tm_split(".", provider.key)[0]]
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attributes = provider.value
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content {
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alias = tm_split(".", provider.key)[1]
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}
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}
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}
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}

‎04-terraform-data-source-across-stacks/imports/vpc.tm.hcl

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generate_hcl "vpc.tf" {
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stack_filter {
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project_paths = [
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"vpc/*"]
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}
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content {
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resource "aws_vpc" "main" {
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cidr_block = "10.0.0.0/16"
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}
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resource "aws_subnet" "main" {
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vpc_id = aws_vpc.main.id
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cidr_block = "10.0.1.0/24"
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availability_zone = "${global.terraform.backend.region}a"
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tags = {
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Name = "${global.terraform.backend.region}a"
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}
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}
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output "subnet_id" {
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value = aws_subnet.main.id
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}
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}
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}

‎04-terraform-data-source-across-stacks/stacks/aws/ec2/instance-a/backend.tf

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// TERRAMATE: GENERATED AUTOMATICALLY DO NOT EDIT
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terraform {
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backend "s3" {
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bucket = "terramate-example-terraform-state-backend"
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dynamodb_table = "terraform-lock"
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encrypt = true
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key = "terraform/stacks/by-id/ffca51f-1666-4572-b838-10634354b85c/terraform.tfstate"
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region = "us-east-1"
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}
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}

‎04-terraform-data-source-across-stacks/stacks/aws/ec2/instance-a/ec2.tf

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// TERRAMATE: GENERATED AUTOMATICALLY DO NOT EDIT
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resource "aws_instance" "web" {
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ami = data.aws_ami.ubuntu.id
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instance_type = "t3.micro"
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subnet_id = data.aws_subnet.subnet.id
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tags = {
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Name = "instance-a"
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}
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}
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data "aws_subnet" "subnet" {
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depends_on = [
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null_resource.initial_deployment_trigger,
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]
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filter {
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name = "tag:Name"
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values = [
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"us-east-1a",
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]
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}
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}
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resource "null_resource" "initial_deployment_trigger" {
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}
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data "aws_ami" "ubuntu" {
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most_recent = true
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owners = [
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"099720109477",
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]
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filter {
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name = "name"
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values = [
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"ubuntu/images/hvm-ssd/ubuntu-jammy-22.04-amd64-server-*",
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]
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}
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filter {
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name = "virtualization-type"
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values = [
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"hvm",
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]
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}
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}

‎04-terraform-data-source-across-stacks/stacks/aws/ec2/instance-a/stack.tm.hcl

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stack {
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name = "instance-a"
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description = "instance-a"
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id = "ffca51f-1666-4572-b838-10634354b85c"
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}

‎04-terraform-data-source-across-stacks/stacks/aws/ec2/instance-a/terraform.tf

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// TERRAMATE: GENERATED AUTOMATICALLY DO NOT EDIT
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terraform {
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required_version = "1.6.6"
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}
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terraform {
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required_providers {
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aws = {
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source = "hashicorp/aws"
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version = "~> 5.31"
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}
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}
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}
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provider "aws" {
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region = "us-east-1"
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}

‎04-terraform-data-source-across-stacks/stacks/aws/ec2/instance-b/backend.tf

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// TERRAMATE: GENERATED AUTOMATICALLY DO NOT EDIT
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terraform {
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backend "s3" {
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bucket = "terramate-example-terraform-state-backend"
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dynamodb_table = "terraform-lock"
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encrypt = true
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key = "terraform/stacks/by-id/249e7f6-dcbc-4038-8a94-012aa17c081f/terraform.tfstate"
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region = "us-east-1"
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}
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}

‎04-terraform-data-source-across-stacks/stacks/aws/ec2/instance-b/ec2.tf

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// TERRAMATE: GENERATED AUTOMATICALLY DO NOT EDIT
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resource "aws_instance" "web" {
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ami = data.aws_ami.ubuntu.id
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instance_type = "t3.micro"
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subnet_id = data.aws_subnet.subnet.id
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tags = {
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Name = "instance-b"
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}
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}
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data "aws_subnet" "subnet" {
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depends_on = [
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null_resource.initial_deployment_trigger,
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]
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filter {
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name = "tag:Name"
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values = [
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"us-east-1a",
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]
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}
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}
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resource "null_resource" "initial_deployment_trigger" {
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}
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data "aws_ami" "ubuntu" {
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most_recent = true
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owners = [
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"099720109477",
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]
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filter {
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name = "name"
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values = [
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"ubuntu/images/hvm-ssd/ubuntu-jammy-22.04-amd64-server-*",
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]
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}
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filter {
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name = "virtualization-type"
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values = [
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"hvm",
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]
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}
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}

‎04-terraform-data-source-across-stacks/stacks/aws/ec2/instance-b/stack.tm.hcl

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stack {
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name = "instance-a"
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description = "instance-a"
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id = "249e7f6-dcbc-4038-8a94-012aa17c081f"
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}

‎04-terraform-data-source-across-stacks/stacks/aws/ec2/instance-b/terraform.tf

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// TERRAMATE: GENERATED AUTOMATICALLY DO NOT EDIT
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terraform {
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required_version = "1.6.6"
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}
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terraform {
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required_providers {
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aws = {
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source = "hashicorp/aws"
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version = "~> 5.31"
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}
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}
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}
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provider "aws" {
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region = "us-east-1"
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}

‎04-terraform-data-source-across-stacks/stacks/aws/vpc/main/backend.tf

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// TERRAMATE: GENERATED AUTOMATICALLY DO NOT EDIT
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terraform {
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backend "s3" {
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bucket = "terramate-example-terraform-state-backend"
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dynamodb_table = "terraform-lock"
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encrypt = true
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key = "terraform/stacks/by-id/fdcfb3-ce64-4ba2-bc1e-1ab22bceba35/terraform.tfstate"
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region = "us-east-1"
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}
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}

‎04-terraform-data-source-across-stacks/stacks/aws/vpc/main/stack.tm.hcl

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stack {
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name = "main"
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description = "main"
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id = "fdcfb3-ce64-4ba2-bc1e-1ab22bceba35"
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}

‎04-terraform-data-source-across-stacks/stacks/aws/vpc/main/terraform.tf

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// TERRAMATE: GENERATED AUTOMATICALLY DO NOT EDIT
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terraform {
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required_version = "1.6.6"
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}
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terraform {
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required_providers {
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aws = {
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source = "hashicorp/aws"
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version = "~> 5.31"
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}
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}
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}
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provider "aws" {
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region = "us-east-1"
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}

‎04-terraform-data-source-across-stacks/stacks/aws/vpc/main/vpc.tf

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// TERRAMATE: GENERATED AUTOMATICALLY DO NOT EDIT
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resource "aws_vpc" "main" {
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cidr_block = "10.0.0.0/16"
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}
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resource "aws_subnet" "main" {
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availability_zone = "us-east-1a"
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cidr_block = "10.0.1.0/24"
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tags = {
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Name = "us-east-1a"
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}
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vpc_id = aws_vpc.main.id
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}
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output "subnet_id" {
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value = aws_subnet.main.id
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}

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