Shell script to get the list of Terraform local module paths which the specified path depends on.

get_terraform_local_module_dependencies.sh

#!/usr/bin/env bash
#
# Get the list of Terraform local module paths which the specified path depends on.
# This command get dependencies recursively.
#
# Usage:
#   $ bash scripts/get_dependencies.sh "<path>"

set -eu
set -o pipefail

get_dependency() {
  local target=$1
  # shellcheck disable=SC2046,SC2002
  cat $(find "$target" -maxdepth 1 -name "*.tf") | grep -e "^ *source *=" | sed 's/.*"\(.*\)".*/\1/' | sort | uniq
}

get_dependencies() {
  local target=$1
  local t
  for t in $(get_dependency "$target"); do
    if [[ ! $t =~ ^\./ ]] && [[ ! $t =~ ^\.\./ ]]; then
      # https://www.terraform.io/docs/modules/sources.html#local-paths
      # > A local path must begin with either ./ or ../
      continue
    fi
    local p
    # DEPENDENCY: realpath is required
    # alpine: apk add coreutils
    p=$(realpath --relative-to="$PWD" "$target/$t")
    echo "$p"
    get_dependencies "$p"
  done
}

get_dependencies "$1" | sort | uniq