drush gl - Use drush to git pull files from the target. Usage `drush gl @mysite.dev`

gl.drush.inc

<?php

/**
 * Implementation of hook_drush_command().
 */
function gl_drush_command() {
  $items['git-pull'] = array(
                'aliases' => array(
                        'gl'
                ),
    'bootstrap' =>  DRUSH_BOOTSTRAP_MAX,
    'description' => 'Attempts to pull the repo for the remote server.',
  );
  return $items;
}

function drush_gl_git_pull(){
  $drupal_root = drush_get_context('DRUSH_SELECTED_DRUPAL_ROOT');
  if (empty($drupal_root)) {
    return drush_user_abort('The Drupal root path cannot be found, please run this command in a higher Drupal bootstrap.');
  }
  drush_shell_exec('cd ' . DRUPAL_ROOT);
  drush_shell_exec('git status');
  $output = drush_shell_exec_output();
  foreach ($output as $msg) {
    if (strpos($msg, 'Not a git repository') !== FALSE) {
      return drush_user_abort('Aborting: The Drupal root path does not contain a valid .git repository.');
    }
    if (strpos($msg, 'working directory clean')) {
      drush_log('Git repository is currently clean.', 'status');
    }
  }
  drush_log('Attempting to pull the latest code...', 'status');
  drush_shell_exec_interactive('git pull');
}

setup-drush-gl.sh

#/bin/bash

cd $HOME/.drush
mkdir -p $HOME/.drush/inc && cd $HOME/.drush/inc
wget https://gist.github.com/chrisjlee/3762567/raw/0dd9f49dec5790690716a3a8fac250ad928f6a36/gl.drush.inc

install:

curl https://gist.github.com/chrisjlee/3762567/raw/164787b24914f9f306e82fd804186f01506a0ece/setup-drush-gl.sh | sh