RoboFile.php

<?php
/**
 * This is project's console commands configuration for Robo task runner.
 *
 * @see http://robo.li/
 */
class RoboFile extends \Robo\Tasks
{
  public $site = 'SITENAMEHERE';
  // Define public methods as commands
  function setup() {
    $this->_mkdir($this->site);
    $this->_mkdir($this->site . '/releases');
  }

  function  composerBuild() {
    $this->taskComposerInstall()->run();
  }

  function release() {
    // Set time release started.
    $time = time();
    $this->composerBuild();
    // Use rsync instead for better support and options.
    $this->taskRsync()
      ->fromPath('.')
      ->toPath($this->site . '/releases/' . $time)
      ->recursive()
      ->excludeVcs()
      ->wholeFile()
      ->humanReadable()
      ->run();
    $this->_symlink($this->site . '/releases/' . $time, $this->site . '/releases/current');
  }

  function rollback($version = 'last') {
    // List all dirs in site directory.
    $rollbackdirs = array_filter(glob($this->site . '/releases/*'), 'is_dir');
    // Clean up the output to make working with it easier.
    array_walk($rollbackdirs, array($this, 'arrayClean'));
    // Remove 'current' directory from list. Current should always be last item.
    array_pop($rollbackdirs);

    if ($version == 'last') {
      $version = end($rollbackdirs);
    }
    else {
      // Check if version exists.
      if ($key = array_search($version, $rollbackdirs)) {
        $version = $rollbackdirs[$key];
      }
      else {
        return print 'Version not found';
      }
    }

    // Re-symlink
    $this->_symlink($this->site . '/releases/' . $version, $this->site . '/releases/current');
  }

  function arrayClean(&$item, $key) {
    $item = str_replace($this->site . '/releases/', '', $item);
  }
}