Script for upgrading modules to 0.12 which are used by terragrunt (this has several hard coded and specialized parts, thus this should only be used as inspiration)

terragrunt-0.12upgrade.sh

#!/usr/bin/env bash

set -e # exit on failure
# set -x # print commands before executing them

arrayContains()
{
	declare e match="$1"
	shift
	for e; do
		[[ "$e" == "$match" ]] && return 0
	done
	return 1
}

log()
{
	echo "[terragrunt-0.12upgrade] $@"
}

logrun()
{
	log "$@"
	"$@"
}

# main
declare -a updatedModules=()

while read -r terragruntHcl; do
	declare directory=$(dirname "$terragruntHcl")
	declare terragruntCache="$directory/.terragrunt-cache"
	declare module=$(sed -n 's@.*scoremedia/thescore-terraform-modules.git//\([^?]\{1,\}\)\?.*@\1@p' "$terragruntHcl")

	# not an actual module, just a parent terragrunt.hcl
	if [[ -z "$module" ]]; then
		log "skipping $terragruntHcl, not a module instance"
		continue
	fi

	# we've already updated this module
	if arrayContains "$module" "${updatedModules[@]}"; then
		log "skipping $terragruntHcl, $module module already updated"
		continue
	fi

	# progress
	log "updating $module via $directory"

	# init
	logrun ts-toolbox terragrunt init --terragrunt-working-dir "$directory" --terragrunt-source /thescore/thescore-terraform-modules/modules --terragrunt-source-update --terragrunt-non-interactive

	# upgrade
	logrun ts-toolbox terragrunt 0.12upgrade -yes --terragrunt-working-dir "$directory" --terragrunt-non-interactive

	# TODO: this copies terragrunt.hcl and versions.tf, skip these
	# copy updated modules
	logrun cp -r "$terragruntCache"/*/*/"$module"/* ~/thescore/thescore-terraform-modules/"$module"/

	# add to the list of updated modules
	updatedModules+=("$module")

	# spacing
	echo ""
done <<< "$(find . -iname terragrunt.hcl -not -path '*/.terragrunt-cache/*')"