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diff --git a/vendor/drush/drush/drush.php b/vendor/drush/drush/drush.php
index f7053d11e..2d079e1fa 100755
--- a/vendor/drush/drush/drush.php
+++ b/vendor/drush/drush/drush.php
@@ -1,12 +1,68 @@
-#!/usr/bin/env php
 <?php
 
+use Drush\Drush;
+use Drush\Config\Environment;
+use Drush\Preflight\Preflight;
+use Drush\Runtime\Runtime;
+use Webmozart\PathUtil\Path;
+
 /**
- * @file
- * drush is a PHP script implementing a command line shell for Drupal.
+ * This script runs Drush.
+ *
+ * Responsibilities of this script:
+ *   - Locate and include the Composer autoload file for Drush.
+ *   - Set up the environment (record user home directory, cwd, etc.).
+ *   - Call the Preflight object to do all necessary setup and execution.
+ *   - Exit with status code returned
  *
- * @requires PHP CLI 5.4.5, or newer.
+ * It is our goal to put all $_SERVER access and other constructs that are
+ * difficult to test in this script to reduce the burden on the unit tests.
+ * This script will only be tested via the functional tests.
+ *
+ * The Drush bootstrap goes through the following steps:
+ *   - (ArgsPreprocessor) Preprocess the commandline arguments, considering only:
+ *     - The named alias `@sitealias` (removed from arguments if present)
+ *     - The --root option (read and retained)
+ *     - The --config option (read and retained)
+ *     - The --alias-path option (read and retained)
+ *   - Load the Drush configuration and alias files from the standard
+ *     global locations (including --config and --alias-path)
+ *   - Determine the local Drupal site targeted, if any
+ *   - Include the Composer autoload for Drupal (if different)
+ *   - Extend configuration and alias files to include files in target Drupal site.
+ *   - Create the Robo DI container and Symfony Application et. al.
+ *   - Run the Symfony Application
+ *     - Predispatch: call a remote Drush command if applicable
+ *     - Bootstrap Drupal via @bootstrap command hook
+ *     - Run commands and command hooks via annotated commands library
+ *     - Catch 'command not found' exception, bootstrap Drupal and run again
+ *   - Return status code
  */
 
-require __DIR__ . '/includes/preflight.inc';
-exit(drush_main());
+// We use PWD if available because getcwd() resolves symlinks, which
+// could take us outside of the Drupal root, making it impossible to find.
+$cwd = empty($_SERVER['PWD']) ? getcwd() : $_SERVER['PWD'];
+
+// Set up autoloader
+$loader = false;
+if (file_exists($autoloadFile = __DIR__ . '/vendor/autoload.php')
+    || file_exists($autoloadFile = __DIR__ . '/../autoload.php')
+    || file_exists($autoloadFile = __DIR__ . '/../../autoload.php')
+) {
+    $loader = include_once($autoloadFile);
+} else {
+    throw new \Exception("Could not locate autoload.php. cwd is $cwd; __DIR__ is " . __DIR__);
+}
+
+// Set up environment
+$environment = new Environment(Path::getHomeDirectory(), $cwd, $autoloadFile);
+$environment->setConfigFileVariant(Drush::getMajorVersion());
+$environment->setLoader($loader);
+$environment->applyEnvironment();
+
+// Preflight and run
+$preflight = new Preflight($environment);
+$runtime = new Runtime($preflight);
+$status_code = $runtime->run($_SERVER['argv']);
+
+exit($status_code);