Update Firefox on Codeship

update_firefox.js

#! /usr/bin/env node

var locate = require('mozilla-get-url')
  , child_process = require('child_process')
  , ProgressBar = require('progress')
  , async = require('async')
  , chalk = require('chalk')
  , request = require('request')
  , fs = require('fs-extra')
  , path = require('path');

var fetchFirefoxUrl = function(done){
  var options = { os: 'linux-x86_64' };
  locate(options, function(err, url){
    done(err, { url: url });
  });
};

var tmpStorage = function(params, done){
  params.path = path.join(process.env.HOME, path.basename(params.url));
  done(null, params);
};

var downloadFirefox = function(params, done){
  var bar;
  request.get(params.url)
  .on('data', function(data){ bar.tick(data.length); })
  .on('response', function(response){
    bar = new ProgressBar("downloading / :percent / :eta / [:bar] ", { total: +response.headers['content-length'] })
    response.on('end', function(err){
      done(err, params);
    });
  })
  .pipe(fs.createWriteStream(params.path));
};

var unTarFirefox = function(params, done){
  var bar, task
    , dataHandler = function(){ bar.tick(); }
    , errorHandler = function(err){ done(new Error('eek ' + err)); }
    , exitHandler = function(){ process.stdout.write("\n"); done(null, params); };

  bar = new ProgressBar("installing / :percent / :eta / [:bar] ", { total: 83 })
  task = child_process.spawn('tar', ['-xvf', params.path ], { cwd: process.env.HOME });
  task.stdout.on('data', dataHandler);
  task.stderr.on('data', dataHandler);
  task.on('error', errorHandler);
  task.on('exit', exitHandler);
};

var waterfall = [ fetchFirefoxUrl , tmpStorage , downloadFirefox , unTarFirefox ];
async.waterfall(waterfall, function(err, params){
  process.exit(0);
});