Duuu! Drupal Auto-Update script. Dirty and Old fashioned.

duuu.php

<?php
/**
 * Duuu! Drupal Auto-Update script. Last tested with Drush 7.0.
 * TODO:
 * - convert to command.
 *
 * Requirements:
 * - Drush 7 **OR** Core Update module enabled.
 * - curl (optionally for HTTP site check).
 *
 * Usage:
 * >  drush scr /path/to/duuu.php --r /www/drupal -l https://example.com --security-only [email protected]  -y
 *
 */

// Projects to update. Leave empty to update all. Use --security-only flag to check security releases only.
$projects = array(); // All projects mode.
//$projects = array('drupal'); // Core only mode.
$email = drush_get_option('email', variable_get('site_mail'));
$bcc = '[email protected]';
$messages = array();

$backup_dir = drush_get_option('backup-dir', drush_server_home() . '/' . 'drush-backups');
$backup_dir = drush_trim_path($backup_dir) . '/duuu/' . gmdate('Y-m-d_His', $_SERVER['REQUEST_TIME']);

// Set one backup dir for all further backups.
drush_set_context('DRUSH_BACKUP_DIR', $backup_dir);
drush_prepare_backup_dir();

// 1. Check if there are security updates of Drupal core.
drush_log('1. Check if there are new updates.');
// Requires update module for Drush < 7.
drush_invoke_process('@self', 'cc', array('drush'));
$return = drush_invoke_process('@self', 'pm-updatestatus', $projects, array('security-only' => drush_get_option('security-only')), FALSE);
$candidates = array();
foreach ($return['object'] as $project => $project_data) {
  if (empty($projects) || in_array($project, $projects)) {
    if ($project_data['existing_version'] != $project_data['candidate_version']) {
      $candidates[$project] = $project . '-' . $project_data['candidate_version'];
    }
  }
}

if (empty($candidates)) {
  drush_log(dt('No code updates available.'), 'ok');
  drush_delete_dir($backup_dir); 
  return FALSE;
}
drush_print_r($candidates);

// 2. Backup database.
drush_log('2. Backup database.');
$return = drush_invoke_process('@self', 'sql-dump', array(), array(
  'result-file' => $backup_dir . '/database.sql',
  'gzip' => TRUE
), FALSE);
if ($return['error_status'] || empty($return['object'])) {
  return drush_set_error('DRUSH_SQL_DUMP_FAILED', dt('sql-dump failed.'));
}
$backup_sql = $return['object'];
drush_log($backup_sql);

// 3. Move site to maintenance mode.
drush_log('3. Move site to maintenance mode.');
drush_invoke_process('@self', 'vset', array(
  'maintenance_mode',
  '1'
), array('exact' => TRUE), FALSE);

// 4. Enable Update module.
drush_log('4. Enable Update module.');
$update_is_enabled_by_script = FALSE;
if (!module_exists('update')) {
  $return = drush_invoke_process('@self', 'en', array('update'), array(), FALSE);
  $update_is_enabled_by_script = TRUE;
}

// 5. Duuu it finally!
drush_log('5. Duuu it finally!');
$success = TRUE;
try {
  // Unset options unsupported by pm-update.
  drush_unset_option('email');
  // drush_invoke('up') always returns FALSE thus $return doesn't make sense.
  $return = drush_invoke('up', $projects);
  // Use Drush errors stack to check if update failed.
  $errors = drush_get_context('DRUSH_ERROR_LOG', array());
  if (!empty($errors)) {
    foreach ($errors as $error_code => $error_messages) {
      $messages[] = $error_code . ': ' . implode(', ', $error_messages);
    }
    $success = FALSE;
  }
} catch (Exception $e) {
  $messages[] = $e->getCode() . ': ' . $e->getMessage();
  $success = FALSE;
}
// Restore robots.txt, .gitignore, .htaccess.
drush_print_r($candidates);
if (isset($candidates['drupal'])) {
  $restore_files = array('robots.txt', '.gitignore', '.htaccess');
  foreach ($restore_files as $file) {
    $old_file = $backup_dir . '/drupal/' . $file;
    $new_file = drush_get_context('DRUSH_DRUPAL_ROOT') . '/' . $file;
    drush_print($old_file . ' ' . md5_file($old_file));
    drush_print($new_file . ' ' . md5_file($new_file));
    if (md5_file($old_file) != md5_file($new_file)) {
      // Restore.
      @drush_op('rename', $new_file, "$new_file.new");
      copy($old_file, $new_file);
      $messages[] = dt('Manual update of @file is required. New file is save as @file.new.', array('@file' => $file));
    }
}
}
// Turn off maintenance mode.
drush_invoke_process('@self', 'vset', array(
  'maintenance_mode',
  '0'
), array('exact' => TRUE), FALSE);
// Disable Update module.
if ($update_is_enabled_by_script) {
  drush_invoke_process('@self', 'dis', array('update'), array(), FALSE);
}

// Touch front page.
$site_available = TRUE;
$http_code = duuu_get_front_page_http_code();
drush_log(dt('Front page responses with @code code.', array('@code' => $http_code)));
if ($http_code >= 500) {
  $success = FALSE;
  $site_available = FALSE;
}

// Rollback.
if (!$success) {
  // Call context-specific upc rollback function in case it wasn't called in drush_invoke('up').
  drush_pm_updatecode_rollback();
  // Database restore.
  drush_invoke_process('@self', 'sql-query', array(), array('file' => $backup_sql), FALSE);

  // Check if site was restored successfully.
  $http_code = duuu_get_front_page_http_code();
  if ($http_code >= 500) {
    $site_available = FALSE;
  }
}

$messages[] = dt('Backup is stored in @backup_dir', array('@backup_dir' => $backup_dir));
if (drush_shell_exec('which du')) {
  drush_shell_exec("du -cksh %s", $backup_dir);
  $return = drush_shell_exec_output();
  if (isset($return[1]) && preg_match('/([\.\w]+)\stotal/', $return[1], $matches)) {
    $messages[] = dt('Backup size: @size.', array('@size' => $matches[1]));
  }
}

// 6. Send email.
drush_log(dt('6. Send email.'));
if ($success) {
  $title = dt('Update successful to @candidates.', array('@candidates' => implode(', ', $candidates)));
}
else {
  $title = dt('New releases available: @candidates. Automatic update failed.', array('@candidates' => implode(', ', $candidates)));
}
if (!$site_available) {
  // TODO: does Drush still works if Drupal is down?
  $title = dt('SITE UNAVAILABLE!') . ' ' . $title;
  mail($email, $title, implode("\n", $messages), "Bcc: $bcc");
}
else {
  $mail_message = drupal_mail('drush', 'key', $email, language_default(), array(), variable_get('site_mail'), FALSE);
  $mail_message['subject'] = $title;
  $mail_message['body'] = $messages;
  $mail_message['headers']['Bcc'] = $bcc;
  $system = drupal_mail_system('drush', 'key');
  $mail_message = $system->format($mail_message);
  $mail_message['result'] = $system->mail($mail_message);
  $result = $mail_message['result'];
}

function duuu_get_front_page_http_code() {
  $site_url = drush_get_context('DRUSH_URI');
  if ($site_url != 'http://default' && valid_url($site_url) && drush_shell_exec('which curl')) {
    drush_shell_exec('curl -s -o /dev/null -I -w "%{http_code}" ' . check_url($site_url) . '/');
    $return = drush_shell_exec_output();
    $http_code = intval($return[0]);
    return $http_code;
  }

  // Command can not be executed.
  return -1;
}