terratag

README

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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.

Terratag in action

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 through 1.2

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:

    terraform init
   

3. Run Terratag

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

   or

    terratag -dir=foo/bar -tags="environment_id=prod,some-tag=value"
   

   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) or a comma seperated list of key=value.
   • -skipTerratagFiles - optional. Default to true. Skips any previously tagged - (files with terratag.tf suffix)
   • -filter - optional. Only apply tags to the selected resource types (regex)

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"}
}

Optional CLI flags

• -dir=<path> - defaults to .. Sets the terraform folder to tag .tf files in
• -skipTerratagFiles=false - Dont skip processing *.terratag.tf files (when running terratag a second time for the same directory)
• -verbose=true - Turn on verbose logging
• -rename=false - Instead of replacing files named <basename>.tf with <basename>.terratag.tf, keep the original filename
• -filter=<regular expression> - defaults to .*. Only apply tags to the resource types matched by the regular expression

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 > 1.18

Build

git clone https://github.com/env0/terratag
cd terratag
go mod tidy
go build ./cmd/terratag

Test

Structure

The test cases are located under test/tests Each test case placed there should have the following directory structure:

my_test
|+ 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 test. 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

Each terraform version has it's own config file containing the list of test suites to run. The config file is under test/fixtures/terraform_xx/config.yaml where xx is the terraform version.

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

Tests can only run on a specific Terraform version -

go test -run TestTerraformXX

We use tfenv to switch between versions. The exact versions used in the CI tests can be found under test/tfenvconf.

Release

1. Create and push a tag locally, in semver format - git tag v0.1.32 && git push origin --tags
2. Goto Github Releases and edit the draft created by Release Drafter Bot - it should contain the change log for the release (if not press on Auto-generate release notes). Make sure it's pointing at the tag you created in the previous step and publish the release.
3. Binaries will be automatically generated by the Github action defined in .github/workflows/release.yml
4. NPM will automatically pick up on the new version.

Documentation

Index

• func Terratag(args cli.Args) error

Functions

func Terratag

func Terratag(args cli.Args) error