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What?

Terratag is a CLI tool allowing for tags or labels to be applied across an entire set of Terraform files. Terratag will apply tags or labels to any AWS, GCP and Azure resources.

Why?

Maintaining tags across your application is hard, especially when done manually. Terratag enables you to easily add tags to your existing IaC and benefit from some cross-resource tag applications you wish you had thought of when you had just started writing your Terraform, saving you tons of time and making future updates easy. Read more on why tagging is important.

How?

Prerequisites

  • Terraform 0.11, 0.12 or 0.13

Usage

  1. Install from homebrew:

    ➜ brew install env0/terratag/terratag
    

    Or download the latest release binary .

  2. Initialize Terraform modules to get provider schema and pull child modules:

  3. Run Terratag

     terratag -dir=foo/bar -tags={"environment_id": "prod"}

    Terratag supports the following arguments:

    • -dir – optional, the directory to recursively search for any .tf file and try to terratag it.
    • -tags – tags, as valid JSON (NOT HCL)
    • -skipTerratagFiles – optional. Default to true. Skips any previously tagged – (files with terratag.tf suffix)

Example Output

Before Terratag

|- aws.tf
|- gcp.tf
# aws.tf
provider "aws" {
  version = "~> 2.0"
  region  = "us-east-1"
}

resource "aws_s3_bucket" "b" {
  bucket = "my-tf-test-bucket"
  acl    = "private"

  tags {
    Name        = "My bucket"
  }
}
#gcp.tf
resource "google_storage_bucket" "static-site" {
  name          = "image-store.com"
  location      = "EU"
  force_destroy = true

  bucket_policy_only = true

  website {
    main_page_suffix = "index.html"
    not_found_page   = "404.html"
  }
  cors {
    origin          = ["http://image-store.com"]
    method          = ["GET", "HEAD", "PUT", "POST", "DELETE"]
    response_header = ["*"]
    max_age_seconds = 3600
  }
  labels = {
    "foo" = "bar"
  }
}

After Terratag

Running terratag -tags={"env0_environment_id":"dev","env0_project_id":"clientA"} will output:

|- aws.terratag.tf
|- gcp.terratag.tf
|- aws.tf.bak
|- gcp.tf.bak
# aws.terratag.tf
provider "aws" {
  version = "~> 2.0"
  region  = "us-east-1"
}

resource "aws_s3_bucket" "b" {
  bucket = "my-tf-test-bucket"
  acl    = "private"

  tags = merge( map("Name", "My bucket" ), local.terratag_added_main)
}
locals {
  terratag_added_main = {"env0_environment_id"="dev","env0_project_id"="clientA"}
}
# gcp.terratag.tf
resource "google_storage_bucket" "static-site" {
  name          = "image-store.com"
  location      = "EU"
  force_destroy = true

  bucket_policy_only = true

  website {
    main_page_suffix = "index.html"
    not_found_page   = "404.html"
  }
  cors {
    origin          = ["http://image-store.com"]
    method          = ["GET", "HEAD", "PUT", "POST", "DELETE"]
    response_header = ["*"]
    max_age_seconds = 3600
  }
  labels = merge( map("foo" , "bar"), local.terratag_added_main)
}
locals {
  terratag_added_main = {"env0_environment_id"="dev","env0_project_id"="clientA"}
}
See more samples here

Notes

  • Resources already having the exact same tag as the one being appended will be overridden

Develop

Issues and Pull Requests are very welcome!

Prerequisites

  • Go > 1.13.5

Build

git clone https://github.com/env0/terratag
go get
go build

Test

Structure

The test suite will look for fixtures under test/fixtures/terraform_xx.


Each fixture placed there should have the following directory structure:

my_fixture
|+ input
  ...            // any depth under /input
     |- main.tf  // this is where we will run all terraform/terratag commands
|- expected
  • input is where you should place the terraform files of your fixture.


    All commands will be executed wherever down the hierarchy where main.tf is located.


    We do that to allow cases where complex nested submodule resolution may take place, and one would like to test how a directory higher up the hierarchy gets resolved.
  • expected is a directory in which all .terratag.tf files will be matched with the output directory

What’s being tested?

Each test will run:

  • terraform init
  • terratag
  • terraform validate

And finally, will compare the results in out with the expected directory

Running Tests

Focus on a particular Terraform version:

go test -run TestTerraformXX

Read More

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