install.core.inc 78.7 KB
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<?php

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use Drupal\Core\DrupalKernel;
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use Drupal\Core\Database\Database;
use Drupal\Core\Database\Install\TaskException;
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use Symfony\Component\HttpFoundation\Request;
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use Symfony\Component\HttpFoundation\Response;
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/**
 * @file
 * API functions for installing Drupal.
 */

/**
 * Global flag to indicate that a task should not be run during the current
 * installation request.
 *
 * This can be used to skip running an installation task when certain
 * conditions are met, even though the task may still show on the list of
 * installation tasks presented to the user. For example, the Drupal installer
 * uses this flag to skip over the database configuration form when valid
 * database connection information is already available from settings.php. It
 * also uses this flag to skip language import tasks when the installation is
 * being performed in English.
 */
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const INSTALL_TASK_SKIP = 1;
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/**
 * Global flag to indicate that a task should be run on each installation
 * request that reaches it.
 *
 * This is primarily used by the Drupal installer for bootstrap-related tasks.
 */
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const INSTALL_TASK_RUN_IF_REACHED = 2;
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/**
 * Global flag to indicate that a task should be run on each installation
 * request that reaches it, until the database is set up and we are able to
 * record the fact that it already ran.
 *
 * This is the default method for running tasks and should be used for most
 * tasks that occur after the database is set up; these tasks will then run
 * once and be marked complete once they are successfully finished. For
 * example, the Drupal installer uses this flag for the batch installation of
 * modules on the new site, and also for the configuration form that collects
 * basic site information and sets up the site maintenance account.
 */
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const INSTALL_TASK_RUN_IF_NOT_COMPLETED = 3;
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/**
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 * Installs Drupal either interactively or via an array of passed-in settings.
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 *
 * The Drupal installation happens in a series of steps, which may be spread
 * out over multiple page requests. Each request begins by trying to determine
 * the last completed installation step (also known as a "task"), if one is
 * available from a previous request. Control is then passed to the task
 * handler, which processes the remaining tasks that need to be run until (a)
 * an error is thrown, (b) a new page needs to be displayed, or (c) the
 * installation finishes (whichever happens first).
 *
 * @param $settings
 *   An optional array of installation settings. Leave this empty for a normal,
 *   interactive, browser-based installation intended to occur over multiple
 *   page requests. Alternatively, if an array of settings is passed in, the
 *   installer will attempt to use it to perform the installation in a single
 *   page request (optimized for the command line) and not send any output
 *   intended for the web browser. See install_state_defaults() for a list of
 *   elements that are allowed to appear in this array.
 *
 * @see install_state_defaults()
 */
function install_drupal($settings = array()) {
  global $install_state;
  // Initialize the installation state with the settings that were passed in,
  // as well as a boolean indicating whether or not this is an interactive
  // installation.
  $interactive = empty($settings);
  $install_state = $settings + array('interactive' => $interactive) + install_state_defaults();
  try {
    // Begin the page request. This adds information about the current state of
    // the Drupal installation to the passed-in array.
    install_begin_request($install_state);
    // Based on the installation state, run the remaining tasks for this page
    // request, and collect any output.
    $output = install_run_tasks($install_state);
  }
  catch (Exception $e) {
    // When an installation error occurs, either send the error to the web
    // browser or pass on the exception so the calling script can use it.
    if ($install_state['interactive']) {
      install_display_output($e->getMessage(), $install_state);
    }
    else {
      throw $e;
    }
  }
  // All available tasks for this page request are now complete. Interactive
  // installations can send output to the browser or redirect the user to the
  // next page.
  if ($install_state['interactive']) {
    if ($install_state['parameters_changed']) {
      // Redirect to the correct page if the URL parameters have changed.
      install_goto(install_redirect_url($install_state));
    }
    elseif (isset($output)) {
      // Display a page only if some output is available. Otherwise it is
      // possible that we are printing a JSON page and theme output should
      // not be shown.
      install_display_output($output, $install_state);
    }
  }
}

/**
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 * Returns an array of default settings for the global installation state.
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 *
 * The installation state is initialized with these settings at the beginning
 * of each page request. They may evolve during the page request, but they are
 * initialized again once the next request begins.
 *
 * Non-interactive Drupal installations can override some of these default
 * settings by passing in an array to the installation script, most notably
 * 'parameters' (which contains one-time parameters such as 'profile' and
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 * 'langcode' that are normally passed in via the URL) and 'forms' (which can
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 * be used to programmatically submit forms during the installation; the keys
 * of each element indicate the name of the installation task that the form
 * submission is for, and the values are used as the $form_state['values']
 * array that is passed on to the form submission via drupal_form_submit()).
 *
 * @see drupal_form_submit()
 */
function install_state_defaults() {
  $defaults = array(
    // The current task being processed.
    'active_task' => NULL,
    // The last task that was completed during the previous installation
    // request.
    'completed_task' => NULL,
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    // This becomes TRUE only when a valid config directory is created or
    // detected.
    'config_verified' => FALSE,
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    // This becomes TRUE only when Drupal's system module is installed.
    'database_tables_exist' => FALSE,
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    // This becomes TRUE only when a valid database connection can be
    // established.
    'database_verified' => FALSE,
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    // An array of forms to be programmatically submitted during the
    // installation. The keys of each element indicate the name of the
    // installation task that the form submission is for, and the values are
    // used as the $form_state['values'] array that is passed on to the form
    // submission via drupal_form_submit().
    'forms' => array(),
    // This becomes TRUE only at the end of the installation process, after
    // all available tasks have been completed and Drupal is fully installed.
    // It is used by the installer to store correct information in the database
    // about the completed installation, as well as to inform theme functions
    // that all tasks are finished (so that the task list can be displayed
    // correctly).
    'installation_finished' => FALSE,
    // Whether or not this installation is interactive. By default this will
    // be set to FALSE if settings are passed in to install_drupal().
    'interactive' => TRUE,
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    // An array of available translation files for the installation.
    'translations' => array(),
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    // An array of parameters for the installation, pre-populated by the URL
    // or by the settings passed in to install_drupal(). This is primarily
    // used to store 'profile' (the name of the chosen installation profile)
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    // and 'langcode' (the code of the chosen installation language), since
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    // these settings need to persist from page request to page request before
    // the database is available for storage.
    'parameters' => array(),
    // Whether or not the parameters have changed during the current page
    // request. For interactive installations, this will trigger a page
    // redirect.
    'parameters_changed' => FALSE,
    // An array of information about the chosen installation profile. This will
    // be filled in based on the profile's .info file.
    'profile_info' => array(),
    // An array of available installation profiles.
    'profiles' => array(),
    // An array of server variables that will be substituted into the global
    // $_SERVER array via drupal_override_server_variables(). Used by
    // non-interactive installations only.
    'server' => array(),
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    // This becomes TRUE only when a valid settings.php file is written
    // (containing both valid database connection information and a valid
    // config directory).
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    'settings_verified' => FALSE,
    // Installation tasks can set this to TRUE to force the page request to
    // end (even if there is no themable output), in the case of an interactive
    // installation. This is needed only rarely; for example, it would be used
    // by an installation task that prints JSON output rather than returning a
    // themed page. The most common example of this is during batch processing,
    // but the Drupal installer automatically takes care of setting this
    // parameter properly in that case, so that individual installation tasks
    // which implement the batch API do not need to set it themselves.
    'stop_page_request' => FALSE,
    // Installation tasks can set this to TRUE to indicate that the task should
    // be run again, even if it normally wouldn't be. This can be used, for
    // example, if a single task needs to be spread out over multiple page
    // requests, or if it needs to perform some validation before allowing
    // itself to be marked complete. The most common examples of this are batch
    // processing and form submissions, but the Drupal installer automatically
    // takes care of setting this parameter properly in those cases, so that
    // individual installation tasks which implement the batch API or form API
    // do not need to set it themselves.
    'task_not_complete' => FALSE,
    // A list of installation tasks which have already been performed during
    // the current page request.
    'tasks_performed' => array(),
  );
  return $defaults;
}

/**
 * Begin an installation request, modifying the installation state as needed.
 *
 * This function performs commands that must run at the beginning of every page
 * request. It throws an exception if the installation should not proceed.
 *
 * @param $install_state
 *   An array of information about the current installation state. This is
 *   modified with information gleaned from the beginning of the page request.
 */
function install_begin_request(&$install_state) {
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  // Add any installation parameters passed in via the URL.
  $install_state['parameters'] += $_GET;

  // Validate certain core settings that are used throughout the installation.
  if (!empty($install_state['parameters']['profile'])) {
    $install_state['parameters']['profile'] = preg_replace('/[^a-zA-Z_0-9]/', '', $install_state['parameters']['profile']);
  }
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  if (!empty($install_state['parameters']['langcode'])) {
    $install_state['parameters']['langcode'] = preg_replace('/[^a-zA-Z_0-9\-]/', '', $install_state['parameters']['langcode']);
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  }

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  // Allow command line scripts to override server variables used by Drupal.
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  require_once DRUPAL_ROOT . '/core/includes/bootstrap.inc';
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  if (!$install_state['interactive']) {
    drupal_override_server_variables($install_state['server']);
  }

  // The user agent header is used to pass a database prefix in the request when
  // running tests. However, for security reasons, it is imperative that no
  // installation be permitted using such a prefix.
  if (isset($_SERVER['HTTP_USER_AGENT']) && strpos($_SERVER['HTTP_USER_AGENT'], "simpletest") !== FALSE) {
    header($_SERVER['SERVER_PROTOCOL'] . ' 403 Forbidden');
    exit;
  }

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  // Initialize conf_path().
  // This primes the site path to be used during installation. By not requiring
  // settings.php, a bare site folder can be prepared in the /sites directory,
  // which will be used for installing Drupal.
  conf_path(FALSE);

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  drupal_bootstrap(DRUPAL_BOOTSTRAP_CONFIGURATION);

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  // A request object from the HTTPFoundation to tell us about the request.
  $request = Request::createFromGlobals();

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  // This must go after drupal_bootstrap(), which unsets globals!
  global $conf;

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  require_once DRUPAL_ROOT . '/core/modules/system/system.install';
  require_once DRUPAL_ROOT . '/core/includes/common.inc';
  require_once DRUPAL_ROOT . '/core/includes/file.inc';
  require_once DRUPAL_ROOT . '/core/includes/install.inc';
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  require_once DRUPAL_ROOT . '/core/includes/schema.inc';
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  require_once DRUPAL_ROOT . '/' . variable_get('path_inc', 'core/includes/path.inc');
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  // Load module basics (needed for hook invokes).
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  include_once DRUPAL_ROOT . '/core/includes/module.inc';
  include_once DRUPAL_ROOT . '/core/includes/session.inc';
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  // Set up $language, so t() caller functions will still work.
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  drupal_language_initialize();
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  require_once DRUPAL_ROOT . '/core/includes/ajax.inc';
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  // Override the module list with a minimal set of modules.
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  $module_list['system']['filename'] = 'core/modules/system/system.module';
  $module_list['entity']['filename'] = 'core/modules/entity/entity.module';
  $module_list['user']['filename']   = 'core/modules/user/user.module';
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  module_list(NULL, $module_list);
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  drupal_load('module', 'system');
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  drupal_load('module', 'entity');
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  drupal_load('module', 'user');

  // Load the cache infrastructure using a "fake" cache implementation that
  // does not attempt to write to the database. We need this during the initial
  // part of the installer because the database is not available yet. We
  // continue to use it even when the database does become available, in order
  // to preserve consistency between interactive and command-line installations
  // (the latter complete in one page request and therefore are forced to
  // continue using the cache implementation they started with) and also
  // because any data put in the cache during the installer is inherently
  // suspect, due to the fact that Drupal is not fully set up yet.
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  require_once DRUPAL_ROOT . '/core/includes/cache.inc';
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  $conf['cache_classes'] = array('cache' => 'Drupal\Core\Cache\InstallBackend');
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  // The install process cannot use the database lock backend since the database
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  // is not fully up, so we use a null backend implementation during the
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  // installation process. This will also speed up the installation process.
  // The site being installed will use the real lock backend when doing AJAX
  // requests but, except for a WSOD, there is no chance for a a lock to stall
  // (as opposed to the cache backend) so we can afford having a null
  // implementation here.
  require_once DRUPAL_ROOT . '/core/includes/lock.inc';
  $conf['lock_backend'] = 'Drupal\Core\Lock\NullLockBackend';
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  // Prepare for themed output. We need to run this at the beginning of the
  // page request to avoid a different theme accidentally getting set. (We also
  // need to run it even in the case of command-line installations, to prevent
  // any code in the installer that happens to initialize the theme system from
  // accessing the database before it is set up yet.)
  drupal_maintenance_theme();
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  // Check existing settings.php.
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  $install_state['database_verified'] = install_verify_database_settings();
  $install_state['config_verified'] = install_ensure_config_directory();
  $install_state['settings_verified'] = $install_state['config_verified'] && $install_state['database_verified'];
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  if ($install_state['database_verified']) {
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    // Initialize the database system. Note that the connection
    // won't be initialized until it is actually requested.
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    require_once DRUPAL_ROOT . '/core/includes/database.inc';
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    // Verify the last completed task in the database, if there is one.
    $task = install_verify_completed_task();
  }
  else {
    $task = NULL;

    // Since previous versions of Drupal stored database connection information
    // in the 'db_url' variable, we should never let an installation proceed if
    // this variable is defined and the settings file was not verified above
    // (otherwise we risk installing over an existing site whose settings file
    // has not yet been updated).
    if (!empty($GLOBALS['db_url'])) {
      throw new Exception(install_already_done_error());
    }
  }

  // Modify the installation state as appropriate.
  $install_state['completed_task'] = $task;
  $install_state['database_tables_exist'] = !empty($task);
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  // Add the list of available profiles to the installation state.
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  $install_state['profiles'] += drupal_system_listing('/^' . DRUPAL_PHP_FUNCTION_PATTERN . '\.profile$/', 'profiles');
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}

/**
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 * Runs all tasks for the current installation request.
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 *
 * In the case of an interactive installation, all tasks will be attempted
 * until one is reached that has output which needs to be displayed to the
 * user, or until a page redirect is required. Otherwise, tasks will be
 * attempted until the installation is finished.
 *
 * @param $install_state
 *   An array of information about the current installation state. This is
 *   passed along to each task, so it can be modified if necessary.
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 *
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 * @return
 *   HTML output from the last completed task.
 */
function install_run_tasks(&$install_state) {
  do {
    // Obtain a list of tasks to perform. The list of tasks itself can be
    // dynamic (e.g., some might be defined by the installation profile,
    // which is not necessarily known until the earlier tasks have run),
    // so we regenerate the remaining tasks based on the installation state,
    // each time through the loop.
    $tasks_to_perform = install_tasks_to_perform($install_state);
    // Run the first task on the list.
    reset($tasks_to_perform);
    $task_name = key($tasks_to_perform);
    $task = array_shift($tasks_to_perform);
    $install_state['active_task'] = $task_name;
    $original_parameters = $install_state['parameters'];
    $output = install_run_task($task, $install_state);
    $install_state['parameters_changed'] = ($install_state['parameters'] != $original_parameters);
    // Store this task as having been performed during the current request,
    // and save it to the database as completed, if we need to and if the
    // database is in a state that allows us to do so. Also mark the
    // installation as 'done' when we have run out of tasks.
    if (!$install_state['task_not_complete']) {
      $install_state['tasks_performed'][] = $task_name;
      $install_state['installation_finished'] = empty($tasks_to_perform);
      if ($install_state['database_tables_exist'] && ($task['run'] == INSTALL_TASK_RUN_IF_NOT_COMPLETED || $install_state['installation_finished'])) {
        variable_set('install_task', $install_state['installation_finished'] ? 'done' : $task_name);
      }
    }
    // Stop when there are no tasks left. In the case of an interactive
    // installation, also stop if we have some output to send to the browser,
    // the URL parameters have changed, or an end to the page request was
    // specifically called for.
    $finished = empty($tasks_to_perform) || ($install_state['interactive'] && (isset($output) || $install_state['parameters_changed'] || $install_state['stop_page_request']));
  } while (!$finished);
  return $output;
}

/**
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 * Runs an individual installation task.
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 *
 * @param $task
 *   An array of information about the task to be run.
 * @param $install_state
 *   An array of information about the current installation state. This is
 *   passed in by reference so that it can be modified by the task.
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 *
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 * @return
 *   The output of the task function, if there is any.
 */
function install_run_task($task, &$install_state) {
  $function = $task['function'];

  if ($task['type'] == 'form') {
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    require_once DRUPAL_ROOT . '/core/includes/form.inc';
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    if ($install_state['interactive']) {
      // For interactive forms, build the form and ensure that it will not
      // redirect, since the installer handles its own redirection only after
      // marking the form submission task complete.
      $form_state = array(
        // We need to pass $install_state by reference in order for forms to
        // modify it, since the form API will use it in call_user_func_array(),
        // which requires that referenced variables be passed explicitly.
        'build_info' => array('args' => array(&$install_state)),
        'no_redirect' => TRUE,
      );
      $form = drupal_build_form($function, $form_state);
      // If a successful form submission did not occur, the form needs to be
      // rendered, which means the task is not complete yet.
      if (empty($form_state['executed'])) {
        $install_state['task_not_complete'] = TRUE;
        return drupal_render($form);
      }
      // Otherwise, return nothing so the next task will run in the same
      // request.
      return;
    }
    else {
      // For non-interactive forms, submit the form programmatically with the
      // values taken from the installation state. Throw an exception if any
      // errors were encountered.
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      $form_state = array(
        'values' => !empty($install_state['forms'][$function]) ? $install_state['forms'][$function] : array(),
        // We need to pass $install_state by reference in order for forms to
        // modify it, since the form API will use it in call_user_func_array(),
        // which requires that referenced variables be passed explicitly.
        'build_info' => array('args' => array(&$install_state)),
      );
      drupal_form_submit($function, $form_state);
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      $errors = form_get_errors();
      if (!empty($errors)) {
        throw new Exception(implode("\n", $errors));
      }
    }
  }

  elseif ($task['type'] == 'batch') {
    // Start a new batch based on the task function, if one is not running
    // already.
    $current_batch = variable_get('install_current_batch');
    if (!$install_state['interactive'] || !$current_batch) {
      $batch = $function($install_state);
      if (empty($batch)) {
        // If the task did some processing and decided no batch was necessary,
        // there is nothing more to do here.
        return;
      }
      batch_set($batch);
      // For interactive batches, we need to store the fact that this batch
      // task is currently running. Otherwise, we need to make sure the batch
      // will complete in one page request.
      if ($install_state['interactive']) {
        variable_set('install_current_batch', $function);
      }
      else {
        $batch =& batch_get();
        $batch['progressive'] = FALSE;
      }
      // Process the batch. For progressive batches, this will redirect.
      // Otherwise, the batch will complete.
      batch_process(install_redirect_url($install_state), install_full_redirect_url($install_state));
    }
    // If we are in the middle of processing this batch, keep sending back
    // any output from the batch process, until the task is complete.
    elseif ($current_batch == $function) {
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      include_once DRUPAL_ROOT . '/core/includes/batch.inc';
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      $output = _batch_page();
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      // Because Batch API now returns a JSON response for intermediary steps,
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      // but the installer doesn't handle Response objects yet, just send the
      // output here and emulate the old model.
      // @todo Replace this when we refactor the installer to use a request-
      //   response workflow.
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      if ($output instanceof Response) {
        $output->send();
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        $output = NULL;
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      }
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      // The task is complete when we try to access the batch page and receive
      // FALSE in return, since this means we are at a URL where we are no
      // longer requesting a batch ID.
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      if ($output === FALSE) {
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        // Return nothing so the next task will run in the same request.
        variable_del('install_current_batch');
        return;
      }
      else {
        // We need to force the page request to end if the task is not
        // complete, since the batch API sometimes prints JSON output
        // rather than returning a themed page.
        $install_state['task_not_complete'] = $install_state['stop_page_request'] = TRUE;
        return $output;
      }
    }
  }

  else {
    // For normal tasks, just return the function result, whatever it is.
    return $function($install_state);
  }
}

/**
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 * Returns a list of tasks to perform during the current installation request.
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 *
 * Note that the list of tasks can change based on the installation state as
 * the page request evolves (for example, if an installation profile hasn't
 * been selected yet, we don't yet know which profile tasks need to be run).
 *
 * @param $install_state
 *   An array of information about the current installation state.
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 *
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 * @return
 *   A list of tasks to be performed, with associated metadata.
 */
function install_tasks_to_perform($install_state) {
  // Start with a list of all currently available tasks.
  $tasks = install_tasks($install_state);
  foreach ($tasks as $name => $task) {
    // Remove any tasks that were already performed or that never should run.
    // Also, if we started this page request with an indication of the last
    // task that was completed, skip that task and all those that come before
    // it, unless they are marked as always needing to run.
    if ($task['run'] == INSTALL_TASK_SKIP || in_array($name, $install_state['tasks_performed']) || (!empty($install_state['completed_task']) && empty($completed_task_found) && $task['run'] != INSTALL_TASK_RUN_IF_REACHED)) {
      unset($tasks[$name]);
    }
    if (!empty($install_state['completed_task']) && $name == $install_state['completed_task']) {
      $completed_task_found = TRUE;
    }
  }
  return $tasks;
}

/**
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 * Returns a list of all tasks the installer currently knows about.
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 *
 * This function will return tasks regardless of whether or not they are
 * intended to run on the current page request. However, the list can change
 * based on the installation state (for example, if an installation profile
 * hasn't been selected yet, we don't yet know which profile tasks will be
 * available).
 *
 * @param $install_state
 *   An array of information about the current installation state.
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 *
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 * @return
 *   A list of tasks, with associated metadata.
 */
function install_tasks($install_state) {
  // Determine whether translation import tasks will need to be performed.
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  $needs_translations = count($install_state['translations']) > 1 && !empty($install_state['parameters']['langcode']) && $install_state['parameters']['langcode'] != 'en';
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  // Start with the core installation tasks that run before handing control
  // to the install profile.
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  $tasks = array(
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    'install_select_language' => array(
      'display_name' => st('Choose language'),
      'run' => INSTALL_TASK_RUN_IF_REACHED,
    ),
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    'install_select_profile' => array(
      'display_name' => st('Choose profile'),
      'display' => count($install_state['profiles']) != 1,
      'run' => INSTALL_TASK_RUN_IF_REACHED,
    ),
    'install_load_profile' => array(
      'run' => INSTALL_TASK_RUN_IF_REACHED,
    ),
    'install_verify_requirements' => array(
      'display_name' => st('Verify requirements'),
    ),
    'install_settings_form' => array(
      'display_name' => st('Set up database'),
      'type' => 'form',
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      // Even though the form only allows the user to enter database settings,
      // we still need to display it if settings.php is invalid in any way,
      // since the form submit handler is where settings.php is rewritten.
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      'run' => $install_state['settings_verified'] ? INSTALL_TASK_SKIP : INSTALL_TASK_RUN_IF_NOT_COMPLETED,
    ),
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    'install_base_system' => array(
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    ),
    'install_bootstrap_full' => array(
      'run' => INSTALL_TASK_RUN_IF_REACHED,
    ),
    'install_profile_modules' => array(
      'display_name' => count($install_state['profiles']) == 1 ? st('Install site') : st('Install profile'),
      'type' => 'batch',
    ),
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    'install_import_translations' => array(
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      'display_name' => st('Set up translations'),
      'display' => $needs_translations,
      'type' => 'batch',
      'run' => $needs_translations ? INSTALL_TASK_RUN_IF_NOT_COMPLETED : INSTALL_TASK_SKIP,
    ),
    'install_configure_form' => array(
      'display_name' => st('Configure site'),
      'type' => 'form',
    ),
  );

  // Now add any tasks defined by the installation profile.
  if (!empty($install_state['parameters']['profile'])) {
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    // Load the profile install file, because it is not always loaded when
    // hook_install_tasks() is invoked (e.g. batch processing).
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    $profile = $install_state['parameters']['profile'];
    $profile_install_file = dirname($install_state['profiles'][$profile]->uri) . '/' . $profile . '.install';
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    if (file_exists($profile_install_file)) {
      include_once $profile_install_file;
    }
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    $function = $install_state['parameters']['profile'] . '_install_tasks';
    if (function_exists($function)) {
      $result = $function($install_state);
      if (is_array($result)) {
        $tasks += $result;
      }
    }
  }

  // Finish by adding the remaining core tasks.
  $tasks += array(
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    'install_import_translations_remaining' => array(
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      'display_name' => st('Finish translations'),
      'display' => $needs_translations,
      'type' => 'batch',
      'run' => $needs_translations ? INSTALL_TASK_RUN_IF_NOT_COMPLETED : INSTALL_TASK_SKIP,
    ),
    'install_finished' => array(
      'display_name' => st('Finished'),
    ),
  );

  // Allow the installation profile to modify the full list of tasks.
  if (!empty($install_state['parameters']['profile'])) {
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    $profile = $install_state['parameters']['profile'];
    $profile_file = $install_state['profiles'][$profile]->uri;
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    if (file_exists($profile_file)) {
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      include_once $profile_file;
      $function = $install_state['parameters']['profile'] . '_install_tasks_alter';
      if (function_exists($function)) {
        $function($tasks, $install_state);
      }
    }
  }

  // Fill in default parameters for each task before returning the list.
  foreach ($tasks as $task_name => &$task) {
    $task += array(
      'display_name' => NULL,
      'display' => !empty($task['display_name']),
      'type' => 'normal',
      'run' => INSTALL_TASK_RUN_IF_NOT_COMPLETED,
      'function' => $task_name,
    );
  }
  return $tasks;
}

/**
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 * Returns a list of tasks that should be displayed to the end user.
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 *
 * The output of this function is a list suitable for sending to
 * theme_task_list().
 *
 * @param $install_state
 *   An array of information about the current installation state.
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 *
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 * @return
 *   A list of tasks, with keys equal to the machine-readable task name and
 *   values equal to the name that should be displayed.
 *
 * @see theme_task_list()
 */
function install_tasks_to_display($install_state) {
  $displayed_tasks = array();
  foreach (install_tasks($install_state) as $name => $task) {
    if ($task['display']) {
      $displayed_tasks[$name] = $task['display_name'];
    }
  }
  return $displayed_tasks;
}

/**
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 * Returns the URL that should be redirected to during an installation request.
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 *
 * The output of this function is suitable for sending to install_goto().
 *
 * @param $install_state
 *   An array of information about the current installation state.
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 *
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 * @return
 *   The URL to redirect to.
 *
 * @see install_full_redirect_url()
 */
function install_redirect_url($install_state) {
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  return 'core/install.php?' . drupal_http_build_query($install_state['parameters']);
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}

/**
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 * Returns the complete URL redirected to during an installation request.
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 *
 * @param $install_state
 *   An array of information about the current installation state.
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 *
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 * @return
 *   The complete URL to redirect to.
 *
 * @see install_redirect_url()
 */
function install_full_redirect_url($install_state) {
  global $base_url;
  return $base_url . '/' . install_redirect_url($install_state);
}

/**
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 * Displays themed installer output and ends the page request.
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 *
 * Installation tasks should use drupal_set_title() to set the desired page
 * title, but otherwise this function takes care of theming the overall page
 * output during every step of the installation.
 *
 * @param $output
 *   The content to display on the main part of the page.
 * @param $install_state
 *   An array of information about the current installation state.
 */
function install_display_output($output, $install_state) {
  drupal_page_header();
  // Only show the task list if there is an active task; otherwise, the page
  // request has ended before tasks have even been started, so there is nothing
  // meaningful to show.
  if (isset($install_state['active_task'])) {
    // Let the theming function know when every step of the installation has
    // been completed.
    $active_task = $install_state['installation_finished'] ? NULL : $install_state['active_task'];
    drupal_add_region_content('sidebar_first', theme('task_list', array('items' => install_tasks_to_display($install_state), 'active' => $active_task)));
  }
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  print theme('install_page', array('content' => $output));
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  exit;
}

/**
 * Installation task; verify the requirements for installing Drupal.
 *
 * @param $install_state
 *   An array of information about the current installation state.
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 *
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 * @return
 *   A themed status report, or an exception if there are requirement errors.
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 *   If there are only requirement warnings, a themed status report is shown
 *   initially, but the user is allowed to bypass it by providing 'continue=1'
 *   in the URL. Otherwise, no output is returned, so that the next task can be
 *   run in the same page request.
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 */
function install_verify_requirements(&$install_state) {
  // Check the installation requirements for Drupal and this profile.
  $requirements = install_check_requirements($install_state);

  // Verify existence of all required modules.
  $requirements += drupal_verify_profile($install_state);

  // Check the severity of the requirements reported.
  $severity = drupal_requirements_severity($requirements);

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  // If there are errors, always display them. If there are only warnings, skip
  // them if the user has provided a URL parameter acknowledging the warnings
  // and indicating a desire to continue anyway. See drupal_requirements_url().
  if ($severity == REQUIREMENT_ERROR || ($severity == REQUIREMENT_WARNING && empty($install_state['parameters']['continue']))) {
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    if ($install_state['interactive']) {
      drupal_set_title(st('Requirements problem'));
      $status_report = theme('status_report', array('requirements' => $requirements));
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      $status_report .= st('Check the messages and <a href="!url">try again</a>.', array('!url' => check_url(drupal_requirements_url($severity))));
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      return $status_report;
    }
    else {
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      // Throw an exception showing any unmet requirements.
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      $failures = array();
      foreach ($requirements as $requirement) {
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        // Skip warnings altogether for non-interactive installations; these
        // proceed in a single request so there is no good opportunity (and no
        // good method) to warn the user anyway.
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        if (isset($requirement['severity']) && $requirement['severity'] == REQUIREMENT_ERROR) {
          $failures[] = $requirement['title'] . ': ' . $requirement['value'] . "\n\n" . $requirement['description'];
        }
      }
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      if (!empty($failures)) {
        throw new Exception(implode("\n\n", $failures));
      }
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    }
  }
}

/**
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 * Installation task; install the base functionality Drupal needs to bootstrap.
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 *
 * @param $install_state
 *   An array of information about the current installation state.
 */
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function install_base_system(&$install_state) {
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  // Install system.module.
  drupal_install_system();
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  // Call file_ensure_htaccess() to ensure that all of Drupal's standard
  // directories (e.g., the public files directory and config directory) have
  // appropriate .htaccess files. These directories will have already been
  // created by this point in the installer, since Drupal creates them during
  // the install_verify_requirements() task. Note that we cannot call
  // file_ensure_access() any earlier than this, since it relies on
  // system.module in order to work.
  file_ensure_htaccess();

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  // Enable the user module so that sessions can be recorded during the
  // upcoming bootstrap step.
  module_enable(array('user'), FALSE);

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  // Save the list of other modules to install for the upcoming tasks.
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  // variable_set() can be used now that system.module is installed.
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  $modules = $install_state['profile_info']['dependencies'];

  // The install profile is also a module, which needs to be installed
  // after all the dependencies have been installed.
  $modules[] = drupal_get_profile();

  variable_set('install_profile_modules', array_diff($modules, array('system')));
  $install_state['database_tables_exist'] = TRUE;
}

/**
 * Verify and return the last installation task that was completed.
 *
 * @return
 *   The last completed task, if there is one. An exception is thrown if Drupal
 *   is already installed.
 */
function install_verify_completed_task() {
  try {
    if ($result = db_query("SELECT value FROM {variable} WHERE name = :name", array('name' => 'install_task'))) {
      $task = unserialize($result->fetchField());
    }
  }
  // Do not trigger an error if the database query fails, since the database
  // might not be set up yet.
  catch (Exception $e) {
  }
  if (isset($task)) {
    if ($task == 'done') {
      throw new Exception(install_already_done_error());
    }
    return $task;
  }
}

/**
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 * Verifies that settings.php specifies a valid database connection.
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 */
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function install_verify_database_settings() {
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  global $databases;
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  if (!empty($databases) && install_verify_pdo()) {
    $database = $databases['default']['default'];
    drupal_static_reset('conf_path');
    $settings_file = './' . conf_path(FALSE) . '/settings.php';
    $errors = install_database_errors($database, $settings_file);
    if (empty($errors)) {
      return TRUE;
    }
  }
  return FALSE;
}

/**
 * Verify PDO library.
 */
function install_verify_pdo() {
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  // PDO was moved to PHP core in 5.2.0, but the old extension (targeting 5.0
  // and 5.1) is still available from PECL, and can still be built without
  // errors. To verify that the correct version is in use, we check the
  // PDO::ATTR_DEFAULT_FETCH_MODE constant, which is not available in the
  // PECL extension.
  return extension_loaded('pdo') && defined('PDO::ATTR_DEFAULT_FETCH_MODE');
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}

/**
 * Installation task; define a form to configure and rewrite settings.php.
 *
 * @param $form_state
 *   An associative array containing the current state of the form.
 * @param $install_state
 *   An array of information about the current installation state.
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 *
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 * @return
 *   The form API definition for the database configuration form.
 */
function install_settings_form($form, &$form_state, &$install_state) {
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  global $databases;
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  $profile = $install_state['parameters']['profile'];

  drupal_static_reset('conf_path');
  $conf_path = './' . conf_path(FALSE);
  $settings_file = $conf_path . '/settings.php';
  $database = isset($databases['default']['default']) ? $databases['default']['default'] : array();

  drupal_set_title(st('Database configuration'));

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  $drivers = drupal_get_database_types();
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  $drivers_keys = array_keys($drivers);
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  $form['driver'] = array(
    '#type' => 'radios',
    '#title' => st('Database type'),
    '#required' => TRUE,
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    '#default_value' => !empty($database['driver']) ? $database['driver'] : current($drivers_keys),
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    '#description' => st('The type of database your @drupal data will be stored in.', array('@drupal' => drupal_install_profile_distribution_name())),
  );
  if (count($drivers) == 1) {
    $form['driver']['#disabled'] = TRUE;
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    $form['driver']['#description'] .= ' ' . st('Your PHP configuration only supports a single database type, so it has been automatically selected.');
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  }

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  // Add driver specific configuration options.
  foreach ($drivers as $key => $driver) {
    $form['driver']['#options'][$key] = $driver->name();

    $form['settings'][$key] = $driver->getFormOptions($database);
    $form['settings'][$key]['#prefix'] = '<h2 class="js-hide">' . st('@driver_name settings', array('@driver_name' => $driver->name())) . '</h2>';
    $form['settings'][$key]['#type'] = 'container';
    $form['settings'][$key]['#tree'] = TRUE;
    $form['settings'][$key]['advanced_options']['#parents'] = array($key);
    $form['settings'][$key]['#states'] = array(
      'visible' => array(
        ':input[name=driver]' => array('value' => $key),
      )
    );
  }
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  $form['actions'] = array('#type' => 'actions');
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  $form['actions']['save'] = array(
    '#type' => 'submit',
    '#value' => st('Save and continue'),
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    '#limit_validation_errors' => array(
      array('driver'),
      array(isset($form_state['input']['driver']) ? $form_state['input']['driver'] : current($drivers_keys)),
    ),
    '#submit' => array('install_settings_form_submit'),
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  );

  $form['errors'] = array();
  $form['settings_file'] = array('#type' => 'value', '#value' => $settings_file);
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  return $form;
}

/**
 * Form API validate for install_settings form.
 */
function install_settings_form_validate($form, &$form_state) {
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  $driver = $form_state['values']['driver'];
  $database = $form_state['values'][$driver];
  $database['driver'] = $driver;

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  // TODO: remove when PIFR will be updated to use 'db_prefix' instead of
  // 'prefix' in the database settings form.
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  $database['prefix'] = $database['db_prefix'];
  unset($database['db_prefix']);
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  $form_state['storage']['database'] = $database;
  $errors = install_database_errors($database, $form_state['values']['settings_file']);
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  foreach ($errors as $name => $message) {
    form_set_error($name, $message);
  }
}

/**
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 * Checks a database connection and returns any errors.
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 */
function install_database_errors($database, $settings_file) {
  global $databases;
  $errors = array();

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  // Check database type.
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  $database_types = drupal_get_database_types();
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  $driver = $database['driver'];
  if (!isset($database_types[$driver])) {
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    $errors['driver'] = st("In your %settings_file file you have configured @drupal to use a %driver server, however your PHP installation currently does not support this database type.", array('%settings_file' => $settings_file, '@drupal' => drupal_install_profile_distribution_name(), '%driver' => $driver));
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  }
  else {
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    // Run driver specific validation
    $errors += $database_types[$driver]->validateDatabaseSettings($database);

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    // Run tasks associated with the database type. Any errors are caught in the
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    // calling function.
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    $databases['default']['default'] = $database;
    // Just changing the global doesn't get the new information processed.
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    // We need to close any active connections and tell the Database class to
    // re-parse $databases.
    if (Database::isActiveConnection()) {
      Database::closeConnection();
    }
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    Database::parseConnectionInfo();

    try {
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      db_run_tasks($driver);
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    }
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    catch (TaskException $e) {
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      // These are generic errors, so we do not have any specific key of the
      // database connection array to attach them to; therefore, we just put
      // them in the error array with standard numeric keys.
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      $errors[$driver . '][0'] = $e->getMessage();
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    }
  }
  return $errors;
}

/**
 * Form API submit for install_settings form.
 */
function install_settings_form_submit($form, &$form_state) {
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  global $install_state;
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  // Update global settings array and save.
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  $settings['databases'] = array(
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    'value'    => array('default' => array('default' => $form_state['storage']['database'])),
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    'required' => TRUE,
  );
  $settings['drupal_hash_salt'] = array(
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    'value'    => drupal_hash_base64(drupal_random_bytes(55)),
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    'required' => TRUE,
  );
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  drupal_rewrite_settings($settings);
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  // Add the config directory to settings.php.
  drupal_install_config_directory();
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  // Indicate that the settings file has been verified, and check the database
  // for the last completed task, now that we have a valid connection. This
  // last step is important since we want to trigger an error if the new
  // database already has Drupal installed.
  $install_state['settings_verified'] = TRUE;
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  $install_state['config_verified'] = TRUE;
  $install_state['database_verified'] = TRUE;
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  $install_state['completed_task'] = install_verify_completed_task();
}

/**
 * Installation task; select which profile to install.
 *
 * @param $install_state
 *   An array of information about the current installation state. The chosen
 *   profile will be added here, if it was not already selected previously, as
 *   will a list of all available profiles.
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 *
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 * @return
 *   For interactive installations, a form allowing the profile to be selected,
 *   if the user has a choice that needs to be made. Otherwise, an exception is
 *   thrown if a profile cannot be chosen automatically.
 */
function install_select_profile(&$install_state) {
  if (empty($install_state['parameters']['profile'])) {
    // Try to find a profile.
    $profile = _install_select_profile($install_state['profiles']);
    if (empty($profile)) {
      // We still don't have a profile, so display a form for selecting one.
      // Only do this in the case of interactive installations, since this is
      // not a real form with submit handlers (the database isn't even set up
      // yet), rather just a convenience method for setting parameters in the
      // URL.
      if ($install_state['interactive']) {
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        include_once DRUPAL_ROOT . '/core/includes/form.inc';
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        drupal_set_title(st('Select an installation profile'));
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        $form = drupal_get_form('install_select_profile_form', $install_state);
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        return drupal_render($form);
      }
      else {
        throw new Exception(install_no_profile_error());
      }
    }
    else {
      $install_state['parameters']['profile'] = $profile;
    }
  }
}

/**
 * Helper function for automatically selecting an installation profile from a
 * list or from a selection passed in via $_POST.
 */
function _install_select_profile($profiles) {
  // Don't need to choose profile if only one available.
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  if (count($profiles) == 1) {
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    $profile = array_pop($profiles);
    return $profile->name;
  }
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  elseif (!empty($_POST['profile']) && isset($profiles[$_POST['profile']])) {
    return $profiles[$_POST['profile']]->name;
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  }
}

/**
 * Form API array definition for the profile selection form.
 *
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 * @param array $install_state
 *   An array of information about the current installation state.
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 */
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function install_select_profile_form($form, &$form_state, $install_state) {
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  $profiles = array();
  $names = array();

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  foreach ($install_state['profiles'] as $profile) {
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    $details = install_profile_info($profile->name);
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    // Don't show hidden profiles. This is used by to hide the testing profile,
    // which only exists to speed up test runs.
    if ($details['hidden'] === TRUE) {
      continue;
    }
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    $profiles[$profile->name] = $details;

    // Determine the name of the profile; default to file name if defined name
    // is unspecified.
    $name = isset($details['name']) ? $details['name'] : $profile->name;
    $names[$profile->name] = $name;
  }

  // Display radio buttons alphabetically by human-readable name, but always
  // put the core profiles first (if they are present in the filesystem).
  natcasesort($names);
  if (isset($names['minimal'])) {
    // If the expert ("Minimal") core profile is present, put it in front of
    // any non-core profiles rather than including it with them alphabetically,
    // since the other profiles might be intended to group together in a
    // particular way.
    $names = array('minimal' => $names['minimal']) + $names;
  }
  if (isset($names['standard'])) {
    // If the default ("Standard") core profile is present, put it at the very
    // top of the list. This profile will have its radio button pre-selected,
    // so we want it to always appear at the top.
    $names = array('standard' => $names['standard']) + $names;
  }

  foreach ($names as $profile => $name) {
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    // The profile name and description are extracted for translation from the
    // .info file, so we can use st() on them even though they are dynamic data
    // at this point.
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    $form['profile'][$name] = array(
      '#type' => 'radio',
      '#value' => 'standard',
      '#return_value' => $profile,
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      '#title' => st($name),
      '#description' => isset($profiles[$profile]['description']) ? st($profiles[$profile]['description']) : '',
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      '#parents' => array('profile'),
    );
  }
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  $form['actions'] = array('#type' => 'actions');
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  $form['actions']['submit'] =  array(
    '#type' => 'submit',
    '#value' => st('Save and continue'),
  );
  return $form;
}

/**
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 * Find all .po files useful for the installer.
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 */
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function install_find_translations() {
  $files = install_find_translation_files();
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  // English does not need a translation file.
  array_unshift($files, (object) array('name' => 'en'));
  foreach ($files as $key => $file) {
    // Strip off the file name component before the language code.
    $files[$key]->langcode = preg_replace('!^(.+\.)?([^\.]+)$!', '\2', $file->name);
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    // Language codes cannot exceed 12 characters to fit into the {language}
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    // table.
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    if (strlen($files[$key]->langcode) > 12) {
      unset($files[$key]);
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    }
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  }
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  return $files;
}

/**
 * Find installer translations either for a specific langcode or all languages.
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 *
 * @param $langcode
 *   (optional) The language code corresponding to the language for which we
 *   want to find translation files. If omitted, information on all available
 *   files will be returned.
 *
 * @return
 *   An associative array of file information objects keyed by file URIs as
 *   returned by file_scan_directory().
 *
 * @see file_scan_directory()
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 */
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function install_find_translation_files($langcode = NULL) {
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  $directory = variable_get('locale_translate_file_directory', conf_path() . '/files/translations');
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  $files = file_scan_directory($directory, '!drupal-\d+\.\d+\.' . (!empty($langcode) ? preg_quote($langcode, '!') : '[^\.]+') . '\.po$!', array('recurse' => FALSE));
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  return $files;
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}

/**
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 * Installation task; select which language to use.
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 *
 * @param $install_state
 *   An array of information about the current installation state. The chosen
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 *   langcode will be added here, if it was not already selected previously, as
 *   will a list of all available languages.
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 *
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 * @return
 *   For interactive installations, a form or other page output allowing the
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 *   language to be selected or providing information about language selection,
 *   if a language has not been chosen. Otherwise, an exception is thrown if a
 *   language cannot be chosen automatically.
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 */
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function install_select_language(&$install_state) {
  // Find all available translations.
  $files = install_find_translations();
  $install_state['translations'] += $files;

  if (!empty($_POST['langcode'])) {
    foreach ($files as $file) {
      if ($_POST['langcode'] == $file->langcode) {
        $install_state['parameters']['langcode'] = $file->langcode;
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        return;
      }
    }
  }

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  if (empty($install_state['parameters']['langcode'])) {
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    // If only the built-in (English) language is available, and we are
    // performing an interactive installation, inform the user that the
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    // installer can be translated. Otherwise we assume the user knows what he
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    // is doing.
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    if (count($files) == 1) {
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      if ($install_state['interactive']) {
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        $directory = variable_get('locale_translate_file_directory', conf_path() . '/files/translations');

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        drupal_set_title(st('Choose language'));
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        if (!empty($install_state['parameters']['translate'])) {
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          $output = '<p>Follow these steps to translate Drupal into your language:</p>';
          $output .= '<ol>';
          $output .= '<li>Download a translation from the <a href="http://localize.drupal.org/download" target="_blank">translation server</a>.</li>';
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          $output .= '<li>Place it into the following directory:<pre>' . $directory . '</pre></li>';
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          $output .= '</ol>';
          $output .= '<p>For more information on installing Drupal in different languages, visit the <a href="http://drupal.org/localize" target="_blank">drupal.org handbook page</a>.</p>';
          $output .= '<p>How should the installation continue?</p>';
          $output .= '<ul>';
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          $output .= '<li><a href="' . check_url(drupal_current_script_url(array('translate' => NULL))) . '">Reload the language selection page after adding translations</a></li>';
          $output .= '<li><a href="' . check_url(drupal_current_script_url(array('langcode' => 'en', 'translate' => NULL))) . '">Continue installation in English</a></li>';
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          $output .= '</ul>';
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        }
        else {
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          include_once DRUPAL_ROOT . '/core/includes/form.inc';
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          $elements = drupal_get_form('install_select_language_form', $files);
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          $output = drupal_render($elements);
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        }
        return $output;
      }
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      // One language, but not an interactive installation. Assume the user
      // knows what he is doing.
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      $file = current($files);
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      $install_state['parameters']['langcode'] = $file->langcode;
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      return;
    }
    else {
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      // We still don't have a langcode, so display a form for selecting one.
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      // Only do this in the case of interactive installations, since this is
      // not a real form with submit handlers (the database isn't even set up
      // yet), rather just a convenience method for setting parameters in the
      // URL.
      if ($install_state['interactive']) {
        drupal_set_title(st('Choose language'));
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        include_once DRUPAL_ROOT . '/core/includes/form.inc';
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        $elements = drupal_get_form('install_select_language_form', $files);
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        return drupal_render($elements);
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      }
      else {
        throw new Exception(st('Sorry, you must select a language to continue the installation.'));
      }
    }
  }
}

/**
 * Form API array definition for language selection.
 */
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function install_select_language_form($form, &$form_state, $files) {
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  include_once DRUPAL_ROOT . '/core/includes/standard.inc';
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  include_once DRUPAL_ROOT . '/core/modules/language/language.negotiation.inc';
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  $standard_languages = standard_language_list();
  $select_options = array();
  $languages = array();

  foreach ($files as $file) {
    if (isset($standard_languages[$file->langcode])) {
      // Build a list of select list options based on files we found.
      $select_options[$file->langcode] = $standard_languages[$file->langcode][1];
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    }
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    else {
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      // If the language was not found in standard.inc, display its langcode.
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      $select_options[$file->langcode] = $file->langcode;
    }
    // Build a list of languages simulated for browser detection.
    $languages[$file->langcode] = (object) array(
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      'langcode' => $file->langcode,
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    );
  }
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  $browser_langcode = language_from_browser($languages);
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  $form['langcode'] = array(
    '#type' => 'select',
    '#options' => $select_options,
    // Use the browser detected language as default or English if nothing found.
    '#default_value' => !empty($browser_langcode) ? $browser_langcode : 'en',
    '#size' => min(count($select_options), 10),
  );

  if (count($files) == 1) {
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    $form['help'] = array(
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      '#markup' => '<p><a href="' . check_url(drupal_current_script_url(array('translate' => 'true'))) . '">' . st('Learn how to install Drupal in other languages') . '</a></p>',
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    );
  }
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  $form['actions'] = array('#type' => 'actions');
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  $form['actions']['submit'] =  array(
    '#type' => 'submit',
    '#value' => st('Save and continue'),
  );
  return $form;
}

/**
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 * Indicates that there are no profiles available.
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 */
function install_no_profile_error() {
  drupal_set_title(st('No profiles available'));
  return st('We were unable to find any installation profiles. Installation profiles tell us what modules to enable and what schema to install in the database. A profile is necessary to continue with the installation process.');
}

/**
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 * Indicates that Drupal has already been installed.
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 */
function install_already_done_error() {
  global $base_url;

  drupal_set_title(st('Drupal already installed'));
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  return st('<ul><li>To start over, you must empty your existing database.</li><li>To install to a different database, edit the appropriate <em>settings.php</em> file in the <em>sites</em> folder.</li><li>To upgrade an existing installation, proceed to the <a href="@base-url/core/update.php">update script</a>.</li><li>View your <a href="@base-url">existing site</a>.</li></ul>', array('@base-url' => $base_url));
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}

/**
 * Installation task; load information about the chosen profile.
 *
 * @param $install_state
 *   An array of information about the current installation state. The loaded
 *   profile information will be added here, or an exception will be thrown if
 *   the profile cannot be loaded.
 */
function install_load_profile(&$install_state) {
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  $profile = $install_state['parameters']['profile'];
  $profile_file = $install_state['profiles'][$profile]->uri;
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  if (file_exists($profile_file)) {
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    include_once $profile_file;
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    $install_state['profile_info'] = install_profile_info($install_state['parameters']['profile'], $install_state['parameters']['langcode']);
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  }
  else {
    throw new Exception(st('Sorry, the profile you have chosen cannot be loaded.'));
  }
}

/**
 * Installation task; perform a full bootstrap of Drupal.
 *
 * @param $install_state
 *   An array of information about the current installation state.
 */
function install_bootstrap_full(&$install_state) {
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  // Clear the module list that was overriden earlier in the process.
  // This will allow all freshly installed modules to be loaded.
  module_list_reset();
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  // @todo The constructor parameters for the Kernel class are for environment,
  // e.g. 'prod', 'dev', and a boolean indicating whether it is in debug mode.
  // Drupal does not currently make use of either of these, though that may
  // change with http://drupal.org/node/1537198.
katbailey's avatar
katbailey committed
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  $kernel = new DrupalKernel('prod', FALSE);
  $kernel->boot();
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  drupal_bootstrap(DRUPAL_BOOTSTRAP_FULL);
}

/**
 * Installation task; install required modules via a batch process.
 *
 * @param $install_state
 *   An array of information about the current installation state.
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 *
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 * @return
 *   The batch definition.
 */
function install_profile_modules(&$install_state) {
  $modules = variable_get('install_profile_modules', array());
  $files = system_rebuild_module_data();
  variable_del('install_profile_modules');
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  // Always install required modules first. Respect the dependencies between
  // the modules.
  $required = array();
  $non_required = array();
  // Although the profile module is marked as required, it needs to go after
  // every dependency, including non-required ones. So clear its required
  // flag for now to allow it to install late.
  $files[$install_state['parameters']['profile']]->info['required'] = FALSE;
  // Add modules that other modules depend on.
  foreach ($modules as $module) {
    if ($files[$module]->requires) {
      $modules = array_merge($modules, array_keys($files[$module]->requires));
    }
  }
  $modules = array_unique($modules);
  foreach ($modules as $module) {
    if (!empty($files[$module]->info['required'])) {
      $required[$module] = $files[$module]->sort;
    }
    else {
      $non_required[$module] = $files[$module]->sort;
    }
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  }
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  arsort($required);
  arsort($non_required);
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  $operations = array();