terragrunt.hcl

# ---------------------------------------------------------------------------------------------------------------------
# TERRAGRUNT CONFIGURATION
# Terragrunt is a thin wrapper for Terraform that provides extra tools for working with multiple Terraform modules,
# remote state, and locking: https://github.com/gruntwork-io/terragrunt
# ---------------------------------------------------------------------------------------------------------------------

locals {
  # Automatically load account-level variables
  account_vars = read_terragrunt_config(find_in_parent_folders("account.hcl"))

  # Automatically load region-level variables
  region_vars = read_terragrunt_config(find_in_parent_folders("region.hcl"))

  # Automatically load environment-level variables
  environment_vars = read_terragrunt_config(find_in_parent_folders("env.hcl"))

  # Extract the variables we need for easy access
  gcp_region         = local.region_vars.locals.gcp_region
  gcp_zone           = local.region_vars.locals.gcp_zone
  gcp_project_id     = local.environment_vars.locals.gcp_project_id
}

# Generate an GCP provider block
generate "provider" {
  path      = "provider.tf"
  if_exists = "overwrite_terragrunt"
  contents  = <<EOF
provider "google" {
  region  = "${local.gcp_region}"
  zone    = "${local.gcp_zone}"
  project = "${local.gcp_project_id}"
}
EOF
}

# Configure Terragrunt to automatically store tfstate files in an S3 bucket
remote_state {
  backend = "gcs"
  
  config = {
    bucket  = "terragrunt-example-terraform-state-${local.gcp_region}"
    prefix = "${path_relative_to_include()}/terraform.tfstate"
    project = "${local.gcp_project_id}"
    location = "${local.gcp_region}"
  }
}

# ---------------------------------------------------------------------------------------------------------------------
# GLOBAL PARAMETERS
# These variables apply to all configurations in this subfolder. These are automatically merged into the child
# `terragrunt.hcl` config via the include block.
# ---------------------------------------------------------------------------------------------------------------------

# Configure root level variables that all resources can inherit. This is especially helpful with multi-account configs
# where terraform_remote_state data sources are placed directly into the modules.
inputs = merge(
  local.account_vars.locals,
  local.region_vars.locals,
  local.environment_vars.locals,
)