install.js

/*!
 * Copyright 2016 Google Inc. All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

'use strict';

var async = require('async');
var fs = require('fs');
var path = require('path');

require('shelljs/global');

var directories = fs.readdirSync(path.join(__dirname, '../packages'));
var PARALLEL_LIMIT = Math.floor(directories.length / 2);
var MAX_RETRIES = 1;

// This is a helper method which will install each module's dependencies.

function installModule(moduleName, callback) {
  var installAttempts = 0;
  console.log('Installing dependencies for ' + moduleName);
  tryToInstallModule();

  function tryToInstallModule() {
    installAttempts++;

    exec('npm install --cache-min 999999', {
      async: true,
      cwd: path.join(__dirname, '../packages', moduleName)
    }, function(err) {
      if (err && installAttempts <= MAX_RETRIES) {
        // Retry installing to circumvent locked npm cache file conflicts on
        // AppVeyor. (RE: https://github.com/npm/npm/issues/9696)
        setTimeout(tryToInstallModule, 250);
        return;
      }

      callback(err);
    });
  }
}

async.eachLimit(directories, PARALLEL_LIMIT, installModule, function(err) {
  if (err) {
    console.error('All dependencies could not be installed');
    return;
  }

  console.log('All dependencies installed');
});