build-folder-structure.sh

#!/bin/bash set-ex
###########################################################################################
# Author: Lior Dux @zMynxx
# Description: This script generates a Terragrunt best practice folder structure with common files at it's level including inheritence.
# Usage: ./build-folder-structure.sh
# Example: ./build-folder-structure.sh
# Dependencies: None
# License: MIT
# Version: 1.0
###########################################################################################

###########
# Globals #
###########
# These globals are set using the get_input function
# accounts=('006262944085')
# regions=('il-central-1' 'us-east-2')
# environments=('prod' 'staging' 'dev')
# subjects=('storage' 'network' 'secrets' 'compute' 'databases')

#############
# Functions #
#############

# /**
# * @brief This function asks the user for input to set up the accounts, regions, environments, and subjects.
# * @param - None
# * @return - None
# */
get_input() {
	echo "Enter the AWS account IDs separated by space: "
	read -r -a accounts
	export accounts

	echo "Enter the AWS regions separated by space: "
	read -r -a regions
	export regions

	echo "Enter the environments separated by space: "
	read -r -a environments
	export environments

	echo "Enter the subjects separated by space: "
	read -r -a subjects
	export subjects
}

# /**
# * @brief This function generates a Terragrunt best practice folder structure with common files at it's level including inheritence.
# * @param - None
# * @return - None
# */
create_structure() {
	mkdir -p modules
	infrastructure_commons_filename="infrastructure.hcl"
	account_commons_filename="account.hcl"
	environment_commons_filename="env.hcl"
	region_commons_filename="region.hcl"

	# Create the infrastructure_commons.hcl file - this file will be used to store the common variables for all the accounts, regions, and environments
	mkdir -p infrastructure-live
	cat <<-HCL >infrastructure-live/"${infrastructure_commons_filename}"
		locals {}
	HCL

	for account in "${accounts[@]}"; do
		# Create the account_commons.hcl file - this file will be used to store the common variables for all the regions and environments
		mkdir -p infrastructure-live/"${account}"
		cat <<HCL >infrastructure-live/"${account}"/"${account_commons_filename}"
locals {
  account_id = "${account}"
  account_name = "my-account-name" # Set this to your account name
  kms_key_id = "arn:aws:kms:us-east-1:${account}:key/12345678-1234-1234-1234-123456789012" # Set this to your KMS key ID
  profile = "my-profile" # Set this to your AWS profile
}
HCL
		#		cat ./scripts/provider.hcl > infrastructure-live/"${account}"/provider.hcl
		ls -la ./scripts/provider.hcl
		cp ./scripts/provider.hcl infrastructure-live/"${account}"/provider.hcl

		for environment in "${environments[@]}"; do
			# Create the environment_commons.hcl file - this file will be used to store the common variables for all the regions
			mkdir -p infrastructure-live/"${account}"/"${environment}"/"${environment}"-1
			cat <<HCL >infrastructure-live/"${account}"/"${environment}"/"${environment_commons_filename}"
locals {
  environment = "${environment}"
  env = "${environment}"
}
HCL

			for region in "${regions[@]}"; do
				mkdir -p infrastructure-live/"${account}"/"${environment}"/"${environment}"-1/"${region}"
				cat <<HCL >infrastructure-live/"${account}"/"${environment}"/"${environment}"-1/"${region}"/"${region_commons_filename}"
locals {
  region = "${region}"
}
HCL

				# Create directories & commons for each of them using a loop
				for dir in "${subjects[@]}"; do
					mkdir -p infrastructure-live/"${account}"/"${environment}"/"${environment}"-1/"${region}"/"${dir}"
					cat <<HCL >infrastructure-live/"${account}"/"${environment}"/"${environment}"-1/"${region}"/"${dir}"/"${dir}.hcl"
locals {
  field = "${dir}"
}
HCL
				done
			done
		done
	done
}

########
#	Main #
########
main() {
	get_input
	create_structure
}

main