install_and_run.js

const { exec } = require('child_process');
const fs = require('fs').promises;
const path = require('path');

const zipUrl = process.env.ZIP_URL;
const downloadPath = '/tmp/app.zip';
const extractPath = '/app';

async function runCommand(command) {
  return new Promise((resolve, reject) => {
    exec(command, (error, stdout, stderr) => {
      if (error) {
        console.error(`Error executing command: ${command}`);
        console.error(stderr);
        reject(error);
        return;
      }
      console.log(`Command executed successfully: ${command}`);
      console.log(stdout);
      resolve(stdout);
    });
  });
}

async function main() {
  if (!zipUrl) {
    console.error("Error: ZIP_URL environment variable not set.");
    process.exit(1);
  }

  try {
    console.log(`Downloading ZIP file from: ${zipUrl} to ${downloadPath}`);
    await runCommand(`wget "${zipUrl}" -O ${downloadPath}`);

    console.log(`Extracting ZIP file to: ${extractPath}`);
    await runCommand(`unzip -o ${downloadPath} -d ${extractPath}`);

    console.log("Removing downloaded ZIP file...");
    await fs.unlink(downloadPath);

    console.log("Starting the application...");
    await runCommand('npm start');

  } catch (error) {
    console.error("An error occurred:", error);
    process.exit(1);
  }
}

main();