Terraform AWS discovery using dtan4/terraforming

collapse_state_files.js

#!/usr/bin/env node

const fs = require('fs');
const path = require('path');
const deepmerge = require('deepmerge');

if (process.argv.length <= 2) {
  console.log("Usage: " + __filename + " path/to/directory");
  process.exit(-1);
}

const dir = process.argv[2];
const tfstate_file = path.join(dir, 'terraform.tfstate');

fs.readdir(dir, function (err, items) {
  if (err) { console.error(err.message); process.exit(1); }

  const files_to_collapse = items.filter((item) => item !== 'terraform.tfstate' && item.endsWith('.tfstate'));
  console.log('Collapsing the following state files into the terraform.tfstate file:');
  console.log('  ' + files_to_collapse.join('\n  ') + '\n');

  const tfstate = JSON.parse(fs.readFileSync(tfstate_file));

  let module_state;

  files_to_collapse.forEach((f) => {
    module_state = JSON.parse(fs.readFileSync(path.normalize(path.join(dir, f))));
    // NOTE: merges assume that all files have a single module defined at path: root (likely true unless you have a large or complex landscape)
    tfstate.modules[0].outputs = deepmerge(tfstate.modules[0].outputs, module_state.modules[0].outputs);
    tfstate.modules[0].resources = deepmerge(tfstate.modules[0].resources, module_state.modules[0].resources);
  });

  console.log(JSON.stringify(tfstate, null, 2));

  fs.writeFileSync(tfstate_file, JSON.stringify(tfstate, null, 2), 'utf8');
});

get_terraform_diff.sh

#!/bin/bash

env_ok=1
if [[ ! -n ${AWS_ACCESS_KEY_ID} ]]; then
  echo "No AWS_ACCESS_KEY_ID variable found in environment"
  env_ok=0
fi
if [[ ! -n ${AWS_SECRET_ACCESS_KEY} ]]; then
  echo "No AWS_SECRET_ACCESS_KEY variable found in environment"
  env_ok=0
fi
if [[ ! -n ${AWS_DEFAULT_REGION} ]]; then
  echo "No AWS_DEFAULT_REGION variable found in environment"
  env_ok=0
fi
if [ $env_ok -eq 0 ]; then
  exit 1
fi

RUN_DIR="$(pwd)"
SCRIPT_DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" >/dev/null && pwd)"

if [[ ! -f "${SCRIPT_DIR}/terraform/terraform.tfstate" ]]; then
  echo "No terraform.tfstate file found at ${SCRIPT_DIR}/terraform/terraform.tfstate"
  exit 1
fi

cd "${SCRIPT_DIR}/terraform" && \
  terraform plan -refresh=true -no-color -state="./terraform.tfstate" -out="./terraform.tfplan" > "./terraform-plan-diff.txt" && \
  cd "${RUN_DIR}"

run_terraforming_container.sh

#!/bin/bash

cmd=$1

env_ok=1
if [[ ! -n ${AWS_ACCESS_KEY_ID} ]]; then
  echo "No AWS_ACCESS_KEY_ID variable found in environment"
  env_ok=0
fi
if [[ ! -n ${AWS_SECRET_ACCESS_KEY} ]]; then
  echo "No AWS_SECRET_ACCESS_KEY variable found in environment"
  env_ok=0
fi
if [[ ! -n ${AWS_DEFAULT_REGION} ]]; then
  echo "No AWS_DEFAULT_REGION variable found in environment"
  env_ok=0
fi
if [ $env_ok -eq 0 ]; then
  exit 1
fi

docker pull quay.io/dtan4/terraforming:latest && \
docker run --rm --name terraforming \
  -e AWS_ACCESS_KEY_ID=${AWS_ACCESS_KEY_ID} \
  -e AWS_SECRET_ACCESS_KEY=${AWS_SECRET_ACCESS_KEY} \
  -e AWS_DEFAULT_REGION=${AWS_DEFAULT_REGION} \
  quay.io/dtan4/terraforming:latest \
  terraforming ${cmd} > ./aws-${cmd}.tf
docker run --rm --name terraforming \
  -e AWS_ACCESS_KEY_ID=${AWS_ACCESS_KEY_ID} \
  -e AWS_SECRET_ACCESS_KEY=${AWS_SECRET_ACCESS_KEY} \
  -e AWS_DEFAULT_REGION=${AWS_DEFAULT_REGION} \
  quay.io/dtan4/terraforming:latest \
  terraforming ${cmd} --tfstate > ./aws-${cmd}-tfstate.json

DISCLAIMER: This was created for my own purposes and may or may not work for you. Feel free to use it, and I hope it can help save you some time, but I make no claims about suitability for your intended work and no guarantees that this will do anything specific. Use at your own risk.