flow showing off how to clone, update and push to a git repo from an AWS lambda function

git-lambda.js

const fs = require('fs')
const path = require('path')
const process = require('process')
const { spawnSync } = require('child_process')

const { GITHUB_TOKEN, GITHUB_USERNAME, GITHUB_EMAIL } = process.env
// leaving this without https:// in order to reuse it when adding the remote
const gitRepositoryURL = 'github.com/owner/repo-name.git'
const repositoryName = 'repo-name'

function runCommand (commandString, options) {
  const [command, ...args] = commandString.match(/(".*?")|(\S+)/g)
  const cmd = spawnSync(command, args, options)

  // you should probably obfuscate the credentials before logging
  const errorString = cmd.stderr.toString()
  if (errorString) {
    throw new Error(
      `Git command failed
      ${commandString}
      ${errorString}`
    )
  }
}

exports.handle = async function (event, context, callback) {
  // install git binary
  await require('lambda-git')()
  // change the cwd to /tmp
  process.chdir('/tmp')
  // clone the repository and set it as the cwd
  // sadly, clone doesn't support --porcelain
  runCommand(`git clone --quiet https://${gitRepositoryURL}`)
  process.chdir(path.join(process.cwd(), repositoryName))

  // make your modifications to the local repository
  fs.appendFileSync(
    path.join(process.cwd(), 'README.md'),
    '\nAutomagically inserted line'
  )

  // update local git config with email and username (required)
  runCommand(`git config --local user.email ${GITHUB_EMAIL}`)
  runCommand(`git config --local user.name ${GITHUB_USERNAME}`)
  // stage local files
  runCommand('git add .')
  // commit changes
  runCommand('git commit -m "commit by :robot:"')
  // replace the remote with an authenticated one
  runCommand('git remote rm origin')
  runCommand(
    `git remote add origin https://${GITHUB_USERNAME}:${GITHUB_TOKEN}@${gitRepositoryURL}`
  )
  // push changes to remote
  runCommand('git push --porcelain --set-upstream origin master')
  // terminate the lambda
  callback(null, 'bye')
}

I just got this email from AWS, this will stop working soon if it requires node 8

---

We are contacting you as we have identified that your AWS Account currently has one or more Lambda functions using Node.js 8.10, which will reach its EOL at the end of 2019.

What’s happening?

The Node community has decided to end support for Node.js 8.x on December 31, 2019 [1]. From this date forward, Node.js 8.x will stop receiving bug fixes, security updates, and/or performance improvements. To ensure that your new and existing functions run on a supported and secure runtime, language runtimes that have reached their EOL are deprecated in AWS

People this line saved my life (aws lambda + nodjs)

const bug = spawnSync("ln", ["-s", "/usr/lib64/libpcre.so.1.2.0", "/tmp/git/usr/lib64/libpcre.so.0"])