A rough prototype of an example of how drush can recursively do a git pull on origin remote for the current branch.

imagex_installkit_ops.inc

<?php
/**
 * @file
 */

function imagex_installkit_ops_drush_command() {
  $commands = array();
  $commands['installkit-ops-update'] = array(
    'bootstrap' => DRUSH_BOOTSTRAP_DRUSH,
    'aliases' => array('ops-update'),
  );
  return $commands;
}

function drush_imagex_installkit_ops_installkit_ops_update() {
  $curdir = drush_cwd();
  _imagex_installkit_ops_git_pull_latest($curdir);
  _imagex_installkit_ops_installkit_ops_update_recursive($curdir);
}

function _imagex_installkit_ops_installkit_ops_update_recursive($directory) {
  if (FALSE !== ($dir = dir($directory))) {
    while (FALSE !== ($entry = $dir->read())) {
      if ('..' === $entry || '.' == $entry) {
        continue;
      }

      $entry = $dir->path . '/' . $entry;
      if (is_dir($entry)) {
        _imagex_installkit_ops_git_pull_latest($entry);
        _imagex_installkit_ops_installkit_ops_update_recursive($entry);
      }
    }
    $dir->close();
  }
}

function _imagex_installkit_ops_git_pull_latest($dir) {
  if (!is_dir($dir . '/.git')) {
    return;
  }

  drush_shell_cd_and_exec($dir, 'git rev-parse --abbrev-ref HEAD');
  $shell_output = drush_shell_exec_output();
  $current_branch = array_shift($shell_output);

  if (!drush_shell_cd_and_exec($dir, 'git pull origin %s', $current_branch)) {
    return drush_log(dt('Unable to fetch latest in !dir.', array('!dir' => $dir)), 'notice');
  }

  drush_log(dt('Fetched latest for !dir.', array('!dir' => $dir)), 'ok');
}

This code should be placed within the following directory ~/.drush/imagex_installkit_ops and in a file named imagex_installkit_ops.drush.inc.

Prior to running drush cc drush.