@hydraulic/conveyor/install.js

Conveyor makes distributing desktop and command line apps as easy as shipping a web app.

const axios = require('axios');
const extract = require('extract-zip');
const fs = require('fs');
const path = require('path');
const pjson = require('./package.json');
const process = require('process');
const tar = require('tar');
const {rimraf} = require('rimraf');

const binDir = path.join(__dirname, 'bin');
const destDir = path.join(binDir, 'install');

async function install(url, script, ext='') {
  // If there is a previous installation, just leave it alone.
  if (fs.existsSync(destDir)) {
    return;
  }
  const tmpDir = path.join(binDir, '.tmp-install')
  fs.mkdirSync(tmpDir, {recursive: true});
  const response = await axios.get(url, {
    responseType: 'arraybuffer'
  });
  const archivePath = path.join(binDir, '.temp');
  fs.writeFileSync(archivePath, response.data);
  try {
    if (url.endsWith('.zip')) {
      await extract(archivePath, { dir: tmpDir });
    } else {
      await tar.extract({
        file: archivePath,
        cwd: tmpDir,
        strip: 1
      });
    }
    // Remove stub that only exists so npm creates a link to the executable.
    await rimraf(path.join(binDir, 'conveyor'));
    const bin = path.join(binDir, 'conveyor' + ext);
    fs.copyFileSync(path.join(binDir, script), bin);
    // Rename atomically as the last step, so we know that if the installation path exists, it is complete and consistent.
    fs.renameSync(tmpDir, destDir);
  } finally {
    rimraf(archivePath);
    // In case something went wrong, clean up the temporary dir.
    rimraf(tmpDir);
  }
}

function parse_version() {
  const parts = pjson.version.split('.');
  // Only include revision number if it is larger than zero.
  if (parseInt(parts[2], 10) != 0) {
    return `${parts[0]}.${parts[1]}-${parts[2]}`;
  }
  return `${parts[0]}.${parts[1]}`;
}

const version = parse_version();
const prefix = `https://downloads.hydraulic.dev/conveyor/conveyor-${version}`;

if (process.platform == 'darwin') {
  if (process.arch == 'arm64') {
    install(`${prefix}-mac-aarch64.zip`, 'conveyor.mac');
  } else {
    install(`${prefix}-mac-amd64.zip`, 'conveyor.mac');
  } 
} else if (process.platform == 'win32') {
  install(`${prefix}-windows-amd64.zip`, 'conveyor.win', '.bat');
} else if (process.platform == 'linux') {
  install(`${prefix}-linux-amd64.tar.gz`, 'conveyor.linux');
} else {
  throw new Error(`Platform ${process.platform} currently not supported`);
}