yarn.js

const fs = require('fs-extra');
const upath = require('upath');
const { getInstalledPath } = require('get-installed-path');
const { exec } = require('child-process-promise');

module.exports = {
  generateLockFile,
};

async function generateLockFile(tmpDir, env) {
  logger.debug(`Spawning yarn install to create ${tmpDir}/yarn.lock`);
  let lockFile = null;
  let stdout;
  let stderr;
  try {
    const startTime = process.hrtime();
    let cmd;
    try {
      // See if renovate is installed locally
      const installedPath = upath.join(
        await getInstalledPath('yarn', {
          local: true,
        }),
        'bin/yarn.js'
      );
      cmd = `node ${installedPath}`;
    } catch (localerr) {
      logger.debug('No locally installed yarn found');
      // Look inside globally installed renovate
      try {
        const renovateLocation = await getInstalledPath('renovate');
        const installedPath = upath.join(
          await getInstalledPath('yarn', {
            local: true,
            cwd: renovateLocation,
          }),
          'bin/yarn.js'
        );
        cmd = `node ${installedPath}`;
      } catch (nestederr) {
        logger.debug('Could not find globally nested yarn');
        // look for global yarn
        try {
          const installedPath = upath.join(
            await getInstalledPath('yarn'),
            'bin/yarn.js'
          );
          cmd = `node ${installedPath}`;
        } catch (globalerr) {
          logger.warn('Could not find globally installed yarn');
          cmd = 'yarn';
        }
      }
    }
    logger.debug(`Using yarn: ${cmd}`);
    cmd += ' install';
    cmd += ' --ignore-scripts';
    cmd += ' --ignore-engines';
    cmd += ' --ignore-platform';
    cmd += process.env.YARN_MUTEX_FILE
      ? ` --mutex file:${process.env.YARN_MUTEX_FILE}`
      : ' --mutex network:31879';

    // TODO: Switch to native util.promisify once using only node 8
    ({ stdout, stderr } = await exec(cmd, {
      cwd: tmpDir,
      shell: true,
      env,
    }));
    logger.debug(`yarn stdout:\n${stdout}`);