corpus_parole: comparison cms/drupal/includes/install.core.inc

equal deleted inserted replaced

-:07239de796bb
+:e756a8c72c3d
+<?php
+/**
+* @file
+* API functions for installing Drupal.
+*/
+/**
+* Do not run the task 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.
+*/
+define('INSTALL_TASK_SKIP', 1);
+/**
+* Run the task on each installation request until the database is set up.
+*
+* This is primarily used by the Drupal installer for bootstrap-related tasks.
+*/
+define('INSTALL_TASK_RUN_IF_REACHED', 2);
+/**
+* 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.
+*/
+define('INSTALL_TASK_RUN_IF_NOT_COMPLETED', 3);
+/**
+* Installs Drupal either interactively or via an array of passed-in settings.
+*
+* 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);
+}
+}
+}
+/**
+* Returns an array of default settings for the global installation state.
+*
+* 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
+* 'locale' that are normally passed in via the URL) and 'forms' (which can
+* 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,
+// This becomes TRUE only when Drupal's system module is installed.
+'database_tables_exist' => FALSE,
+// 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,
+// An array of available languages for the installation.
+'locales' => array(),
+// 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)
+// and 'locale' (the name of the chosen installation language), since
+// 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(),
+// This becomes TRUE only when a valid database connection can be
+// established.
+'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;
+}
+/**
+* Begins 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) {
+// 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]/', '', $install_state['parameters']['profile']);
+}
+if (!empty($install_state['parameters']['locale'])) {
+$install_state['parameters']['locale'] = preg_replace('/[^a-zA-Z_0-9\-]/', '', $install_state['parameters']['locale']);
+}
+// Allow command line scripts to override server variables used by Drupal.
+require_once DRUPAL_ROOT . '/includes/bootstrap.inc';
+if (!$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;
+}
+drupal_bootstrap(DRUPAL_BOOTSTRAP_CONFIGURATION);
+// This must go after drupal_bootstrap(), which unsets globals!
+global $conf;
+require_once DRUPAL_ROOT . '/modules/system/system.install';
+require_once DRUPAL_ROOT . '/includes/common.inc';
+require_once DRUPAL_ROOT . '/includes/file.inc';
+require_once DRUPAL_ROOT . '/includes/install.inc';
+require_once DRUPAL_ROOT . '/' . variable_get('path_inc', 'includes/path.inc');
+// Load module basics (needed for hook invokes).
+include_once DRUPAL_ROOT . '/includes/module.inc';
+include_once DRUPAL_ROOT . '/includes/session.inc';
+// Set up $language, so t() caller functions will still work.
+drupal_language_initialize();
+include_once DRUPAL_ROOT . '/includes/entity.inc';
+require_once DRUPAL_ROOT . '/includes/ajax.inc';
+$module_list['system']['filename'] = 'modules/system/system.module';
+$module_list['user']['filename'] = 'modules/user/user.module';
+module_list(TRUE, FALSE, FALSE, $module_list);
+drupal_load('module', 'system');
+drupal_load('module', 'user');
+// Load the cache infrastructure using a "fake" cache implementation that
+// does not attempt to write to the database. We need this during the initial
+// part of the installer because the database is not available yet. We
+// continue to use it even when the database does become available, in order
+// to preserve consistency between interactive and command-line installations
+// (the latter complete in one page request and therefore are forced to
+// continue using the cache implementation they started with) and also
+// because any data put in the cache during the installer is inherently
+// suspect, due to the fact that Drupal is not fully set up yet.
+require_once DRUPAL_ROOT . '/includes/cache.inc';
+require_once DRUPAL_ROOT . '/includes/cache-install.inc';
+$conf['cache_default_class'] = 'DrupalFakeCache';
+// 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();
+// Check existing settings.php.
+$install_state['settings_verified'] = install_verify_settings();
+if ($install_state['settings_verified']) {
+// Initialize the database system. Note that the connection
+// won't be initialized until it is actually requested.
+require_once DRUPAL_ROOT . '/includes/database/database.inc';
+// Verify the last completed task in the database, if there is one.
+$task = install_verify_completed_task();
+}
+else {
+$task = NULL;
+// Do not install over a configured settings.php. Check the 'db_url'
+// variable in addition to 'databases', since previous versions of Drupal
+// used that (and we do not want to allow installations on an existing site
+// whose settings file has not yet been updated).
+if (!empty($GLOBALS['databases']) || !empty($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);
+}
+/**
+* Runs all tasks for the current installation request.
+*
+* 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 $install_state
+*   An array of information about the current installation state. This is
+*   passed along to each task, so it can be modified if necessary.
+*
+* @return
+*   HTML output from the last completed task.
+*/
+function install_run_tasks(&$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;
+}
+/**
+* Runs an individual installation task.
+*
+* @param $task
+*   An array of information about the task to be run as returned by
+*   hook_install_tasks().
+* @param $install_state
+*   An array of information about the current installation state. This is
+*   passed in by reference so that it can be modified by the task.
+*
+* @return
+*   The output of the task function, if there is any.
+*/
+function install_run_task($task, &$install_state) {
+$function = $task['function'];
+if ($task['type'] == 'form') {
+require_once DRUPAL_ROOT . '/includes/form.inc';
+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.
+$form_state = array(
+'values' => !empty($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, $form_state);
+$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 == $function) {
+include_once DRUPAL_ROOT . '/includes/batch.inc';
+$output = _batch_page();
+// 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.
+if ($output === FALSE) {
+// Return nothing so the next task will run in the same request.
+variable_del('install_current_batch');
+return;
+}
+else {
+// We need to force the page request to end if the task is not
+// complete, since the batch API sometimes prints JSON output
+// rather than returning a themed page.
+$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);
+}
+}
+/**
+* Returns a list of tasks to perform during the current installation request.
+*
+* 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).
+*
+* You can override this using hook_install_tasks() or
+* hook_install_tasks_alter().
+*
+* @param $install_state
+*   An array of information about the current installation state.
+*
+* @return
+*   A list of tasks to be performed, with associated metadata as returned by
+*   hook_install_tasks().
+*/
+function install_tasks_to_perform($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;
+}
+/**
+* Returns a list of all tasks the installer currently knows about.
+*
+* 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 $install_state
+*   An array of information about the current installation state.
+*
+* @return
+*   A list of tasks, with associated metadata.
+*/
+function install_tasks($install_state) {
+// Determine whether translation import tasks will need to be performed.
+$needs_translations = count($install_state['locales']) > 1 && !empty($install_state['parameters']['locale']) && $install_state['parameters']['locale'] != 'en';
+// Start with the core installation tasks that run before handing control
+// to the installation profile.
+$tasks = array(
+'install_select_profile' => array(
+'display_name' => st('Choose profile'),
+'display' => count($install_state['profiles']) != 1,
+'run' => INSTALL_TASK_RUN_IF_REACHED,
+),
+'install_select_locale' => array(
+'display_name' => st('Choose language'),
+'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',
+'run' => $install_state['settings_verified'] ? INSTALL_TASK_SKIP : INSTALL_TASK_RUN_IF_NOT_COMPLETED,
+),
+'install_system_module' => array(
+),
+'install_bootstrap_full' => array(
+'run' => INSTALL_TASK_RUN_IF_REACHED,
+),
+'install_profile_modules' => array(
+'display_name' => count($install_state['profiles']) == 1 ? st('Install site') : st('Install profile'),
+'type' => 'batch',
+),
+'install_import_locales' => array(
+'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'])) {
+// Load the profile install file, because it is not always loaded when
+// hook_install_tasks() is invoked (e.g. batch processing).
+$profile_install_file = DRUPAL_ROOT . '/profiles/' . $install_state['parameters']['profile'] . '/' . $install_state['parameters']['profile'] . '.install';
+if (file_exists($profile_install_file)) {
+include_once $profile_install_file;
+}
+$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(
+'install_import_locales_remaining' => array(
+'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'])) {
+$profile_file = DRUPAL_ROOT . '/profiles/' . $install_state['parameters']['profile'] . '/' . $install_state['parameters']['profile'] . '.profile';
+if (file_exists($profile_file)) {
+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;
+}
+/**
+* Returns a list of tasks that should be displayed to the end user.
+*
+* The output of this function is a list suitable for sending to
+* theme_task_list().
+*
+* @param $install_state
+*   An array of information about the current installation state.
+*
+* @return
+*   A list of tasks, with keys equal to the machine-readable task name and
+*   values equal to the name that should be displayed.
+*
+* @see theme_task_list()
+*/
+function install_tasks_to_display($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;
+}
+/**
+* Returns the URL that should be redirected to during an installation request.
+*
+* The output of this function is suitable for sending to install_goto().
+*
+* @param $install_state
+*   An array of information about the current installation state.
+*
+* @return
+*   The URL to redirect to.
+*
+* @see install_full_redirect_url()
+*/
+function install_redirect_url($install_state) {
+return 'install.php?' . drupal_http_build_query($install_state['parameters']);
+}
+/**
+* Returns the complete URL redirected to during an installation request.
+*
+* @param $install_state
+*   An array of information about the current installation state.
+*
+* @return
+*   The complete URL to redirect to.
+*
+* @see install_redirect_url()
+*/
+function install_full_redirect_url($install_state) {
+global $base_url;
+return $base_url . '/' . install_redirect_url($install_state);
+}
+/**
+* Displays themed installer output and ends the page request.
+*
+* 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, $install_state) {
+drupal_page_header();
+// Prevent install.php from being indexed when installed in a sub folder.
+// robots.txt rules are not read if the site is within domain.com/subfolder
+// resulting in /subfolder/install.php being found through search engines.
+// When settings.php is writeable this can be used via an external database
+// leading a malicious user to gain php access to the server.
+$noindex_meta_tag = array(
+'#tag' => 'meta',
+'#attributes' => array(
+'name' => 'robots',
+'content' => 'noindex, nofollow',
+),
+);
+drupal_add_html_head($noindex_meta_tag, 'install_meta_robots');
+// Only show the task list if there is an active task; otherwise, the page
+// request has ended before tasks have even been started, so there is nothing
+// meaningful to show.
+if (isset($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)));
+}
+print theme('install_page', array('content' => $output));
+exit;
+}
+/**
+* Verifies the requirements for installing Drupal.
+*
+* @param $install_state
+*   An array of information about the current installation state.
+*
+* @return
+*   A themed status report, or an exception if there are requirement errors.
+*   If there are only requirement warnings, a themed status report is shown
+*   initially, but the user is allowed to bypass it by providing 'continue=1'
+*   in the URL. Otherwise, no output is returned, so that the next task can be
+*   run in the same page request.
+*/
+function install_verify_requirements(&$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);
+// 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($install_state['parameters']['continue']))) {
+if ($install_state['interactive']) {
+drupal_set_title(st('Requirements problem'));
+$status_report = theme('status_report', array('requirements' => $requirements));
+$status_report .= st('Check the error messages and <a href="!url">proceed with the installation</a>.', array('!url' => check_url(drupal_requirements_url($severity))));
+return $status_report;
+}
+else {
+// Throw an exception showing any unmet requirements.
+$failures = array();
+foreach ($requirements as $requirement) {
+// Skip warnings altogether for non-interactive installations; these
+// proceed in a single request so there is no good opportunity (and no
+// good method) to warn the user anyway.
+if (isset($requirement['severity']) && $requirement['severity'] == REQUIREMENT_ERROR) {
+$failures[] = $requirement['title'] . ': ' . $requirement['value'] . "\n\n" . $requirement['description'];
+}
+}
+if (!empty($failures)) {
+throw new Exception(implode("\n\n", $failures));
+}
+}
+}
+}
+/**
+* Installation task; install the Drupal system module.
+*
+* @param $install_state
+*   An array of information about the current installation state.
+*/
+function install_system_module(&$install_state) {
+// Install system.module.
+drupal_install_system();
+// Call file_ensure_htaccess() to ensure that all of Drupal's standard
+// directories (e.g., the public and private files directories) 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_htaccess() any earlier than this, since it relies on
+// system.module in order to work.
+file_ensure_htaccess();
+// Enable the user module so that sessions can be recorded during the
+// upcoming bootstrap step.
+module_enable(array('user'), FALSE);
+// Save the list of other modules to install for the upcoming tasks.
+// variable_set() can be used now that system.module is installed.
+$modules = $install_state['profile_info']['dependencies'];
+// The installation profile is also a module, which needs to be installed
+// after all the dependencies have been installed.
+$modules[] = drupal_get_profile();
+variable_set('install_profile_modules', array_diff($modules, array('system')));
+$install_state['database_tables_exist'] = TRUE;
+// Prevent the hook_requirements() check from telling us to convert the
+// database to utf8mb4.
+$connection = Database::getConnection();
+if ($connection->utf8mb4IsConfigurable() && $connection->utf8mb4IsActive()) {
+variable_set('drupal_all_databases_are_utf8mb4', TRUE);
+}
+}
+/**
+* Verifies and returns the last installation task that was completed.
+*
+* @return
+*   The last completed task, if there is one. An exception is thrown if Drupal
+*   is already installed.
+*/
+function install_verify_completed_task() {
+try {
+if ($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;
+}
+}
+/**
+* Verifies the existing settings in settings.php.
+*/
+function install_verify_settings() {
+global $databases;
+// Verify existing settings (if any).
+if (!empty($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;
+}
+/**
+* Verifies the PDO library.
+*/
+function install_verify_pdo() {
+// 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');
+}
+/**
+* Form constructor for a form to configure and rewrite settings.php.
+*
+* @param $install_state
+*   An array of information about the current installation state.
+*
+* @see install_settings_form_validate()
+* @see install_settings_form_submit()
+* @ingroup forms
+*/
+function install_settings_form($form, &$form_state, &$install_state) {
+global $databases;
+$profile = $install_state['parameters']['profile'];
+$install_locale = $install_state['parameters']['locale'];
+drupal_static_reset('conf_path');
+$conf_path = './' . conf_path(FALSE);
+$settings_file = $conf_path . '/settings.php';
+$database = isset($databases['default']['default']) ? $databases['default']['default'] : array();
+drupal_set_title(st('Database configuration'));
+$drivers = drupal_get_database_types();
+$drivers_keys = array_keys($drivers);
+$form['driver'] = array(
+'#type' => 'radios',
+'#title' => st('Database type'),
+'#required' => TRUE,
+'#default_value' => !empty($database['driver']) ? $database['driver'] : current($drivers_keys),
+'#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;
+$form['driver']['#description'] .= ' ' . st('Your PHP configuration only supports a single database type, so it has been automatically selected.');
+}
+// Add driver specific configuration options.
+foreach ($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' => $key),
+)
+);
+}
+$form['actions'] = array('#type' => 'actions');
+$form['actions']['save'] = array(
+'#type' => 'submit',
+'#value' => st('Save and continue'),
+'#limit_validation_errors' => array(
+array('driver'),
+array(isset($form_state['input']['driver']) ? $form_state['input']['driver'] : current($drivers_keys)),
+),
+'#submit' => array('install_settings_form_submit'),
+);
+$form['errors'] = array();
+$form['settings_file'] = array('#type' => 'value', '#value' => $settings_file);
+return $form;
+}
+/**
+* Form validation handler for install_settings_form().
+*
+* @see install_settings_form_submit()
+*/
+function install_settings_form_validate($form, &$form_state) {
+$driver = $form_state['values']['driver'];
+$database = $form_state['values'][$driver];
+$database['driver'] = $driver;
+// TODO: remove when PIFR will be updated to use 'db_prefix' instead of
+// 'prefix' in the database settings form.
+$database['prefix'] = $database['db_prefix'];
+unset($database['db_prefix']);
+$form_state['storage']['database'] = $database;
+$errors = install_database_errors($database, $form_state['values']['settings_file']);
+foreach ($errors as $name => $message) {
+form_set_error($name, $message);
+}
+}
+/**
+* Checks a database connection and returns any errors.
+*/
+function install_database_errors($database, $settings_file) {
+global $databases;
+$errors = array();
+// Check database type.
+$database_types = drupal_get_database_types();
+$driver = $database['driver'];
+if (!isset($database_types[$driver])) {
+$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' => $driver));
+}
+else {
+// Run driver specific validation
+$errors += $database_types[$driver]->validateDatabaseSettings($database);
+// Run tasks associated with the database type. Any errors are caught in the
+// calling function.
+$databases['default']['default'] = $database;
+// Just changing the global doesn't get the new information processed.
+// We tell tell the Database class to re-parse $databases.
+Database::parseConnectionInfo();
+try {
+db_run_tasks($driver);
+}
+catch (DatabaseTaskException $e) {
+// These are generic errors, so we do not have any specific key of the
+// database connection array to attach them to; therefore, we just put
+// them in the error array with standard numeric keys.
+$errors[$driver . '][0'] = $e->getMessage();
+}
+}
+return $errors;
+}
+/**
+* Form submission handler for install_settings_form().
+*
+* @see install_settings_form_validate()
+*/
+function install_settings_form_submit($form, &$form_state) {
+global $install_state;
+// Update global settings array and save.
+$settings['databases'] = array(
+'value'    => array('default' => array('default' => $form_state['storage']['database'])),
+'required' => TRUE,
+);
+$settings['drupal_hash_salt'] = array(
+'value'    => drupal_random_key(),
+'required' => TRUE,
+);
+drupal_rewrite_settings($settings);
+// Indicate that the settings file has been verified, and check the database
+// for the last completed task, now that we have a valid connection. This
+// last step is important since we want to trigger an error if the new
+// database already has Drupal installed.
+$install_state['settings_verified'] = TRUE;
+$install_state['completed_task'] = install_verify_completed_task();
+}
+/**
+* Finds all .profile files.
+*/
+function install_find_profiles() {
+return file_scan_directory('./profiles', '/\.profile$/', array('key' => 'name'));
+}
+/**
+* Selects which profile to install.
+*
+* @param $install_state
+*   An array of information about the current installation state. The chosen
+*   profile will be added here, if it was not already selected previously, as
+*   will a list of all available profiles.
+*
+* @return
+*   For interactive installations, a form allowing the profile to be selected,
+*   if the user has a choice that needs to be made. Otherwise, an exception is
+*   thrown if a profile cannot be chosen automatically.
+*/
+function install_select_profile(&$install_state) {
+$install_state['profiles'] += install_find_profiles();
+if (empty($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']) {
+include_once DRUPAL_ROOT . '/includes/form.inc';
+drupal_set_title(st('Select an installation profile'));
+$form = drupal_get_form('install_select_profile_form', $install_state['profiles']);
+return drupal_render($form);
+}
+else {
+throw new Exception(install_no_profile_error());
+}
+}
+else {
+$install_state['parameters']['profile'] = $profile;
+}
+}
+}
+/**
+* Selects an installation profile.
+*
+* A profile will be selected if:
+* - Only one profile is available,
+* - A profile was submitted through $_POST,
+* - Exactly one of the profiles is marked as "exclusive".
+* If multiple profiles are marked as "exclusive" then no profile will be
+* selected.
+*
+* @param array $profiles
+*   An associative array of profiles with the machine-readable names as keys.
+*
+* @return
+*   The machine-readable name of the selected profile or NULL if no profile was
+*   selected.
+*/
+function _install_select_profile($profiles) {
+if (sizeof($profiles) == 0) {
+throw new Exception(install_no_profile_error());
+}
+// Don't need to choose profile if only one available.
+if (sizeof($profiles) == 1) {
+$profile = array_pop($profiles);
+// TODO: is this right?
+require_once DRUPAL_ROOT . '/' . $profile->uri;
+return $profile->name;
+}
+else {
+foreach ($profiles as $profile) {
+if (!empty($_POST['profile']) && ($_POST['profile'] == $profile->name)) {
+return $profile->name;
+}
+}
+}
+// Check for a profile marked as "exclusive" and ensure that only one
+// profile is marked as such.
+$exclusive_profile = NULL;
+foreach ($profiles as $profile) {
+$profile_info = install_profile_info($profile->name);
+if (!empty($profile_info['exclusive'])) {
+if (empty($exclusive_profile)) {
+$exclusive_profile = $profile->name;
+}
+else {
+// We found a second "exclusive" profile. There's no way to choose
+// between them, so we ignore the property.
+return;
+}
+}
+}
+return $exclusive_profile;
+}
+/**
+* Form constructor for the profile selection form.
+*
+* @param $form_state
+*   Array of metadata about state of form processing.
+* @param $profile_files
+*   Array of .profile files, as returned from file_scan_directory().
+*
+* @ingroup forms
+*/
+function install_select_profile_form($form, &$form_state, $profile_files) {
+$profiles = array();
+$names = array();
+foreach ($profile_files as $profile) {
+// TODO: is this right?
+include_once DRUPAL_ROOT . '/' . $profile->uri;
+$details = install_profile_info($profile->name);
+// Don't show hidden profiles. This is used by to hide the testing profile,
+// which only exists to speed up test runs.
+if ($details['hidden'] === TRUE) {
+continue;
+}
+$profiles[$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 => $name) {
+$form['profile'][$name] = array(
+'#type' => 'radio',
+'#value' => 'standard',
+'#return_value' => $profile,
+'#title' => $name,
+'#description' => isset($profiles[$profile]['description']) ? $profiles[$profile]['description'] : '',
+'#parents' => array('profile'),
+);
+}
+$form['actions'] = array('#type' => 'actions');
+$form['actions']['submit'] =  array(
+'#type' => 'submit',
+'#value' => st('Save and continue'),
+);
+return $form;
+}
+/**
+* Find all .po files for the current profile.
+*/
+function install_find_locales($profilename) {
+$locales = file_scan_directory('./profiles/' . $profilename . '/translations', '/\.po$/', array('recurse' => FALSE));
+array_unshift($locales, (object) array('name' => 'en'));
+foreach ($locales as $key => $locale) {
+// The locale (file name) might be drupal-7.2.cs.po instead of cs.po.
+$locales[$key]->langcode = preg_replace('!^(.+\.)?([^\.]+)$!', '\2', $locale->name);
+// Language codes cannot exceed 12 characters to fit into the {languages}
+// table.
+if (strlen($locales[$key]->langcode) > 12) {
+unset($locales[$key]);
+}
+}
+return $locales;
+}
+/**
+* Installation task; select which locale to use for the current profile.
+*
+* @param $install_state
+*   An array of information about the current installation state. The chosen
+*   locale will be added here, if it was not already selected previously, as
+*   will a list of all available locales.
+*
+* @return
+*   For interactive installations, a form or other page output allowing the
+*   locale to be selected or providing information about locale selection, if
+*   a locale has not been chosen. Otherwise, an exception is thrown if a
+*   locale cannot be chosen automatically.
+*/
+function install_select_locale(&$install_state) {
+// Find all available locales.
+$profilename = $install_state['parameters']['profile'];
+$locales = install_find_locales($profilename);
+$install_state['locales'] += $locales;
+if (!empty($_POST['locale'])) {
+foreach ($locales as $locale) {
+if ($_POST['locale'] == $locale->langcode) {
+$install_state['parameters']['locale'] = $locale->langcode;
+return;
+}
+}
+}
+if (empty($install_state['parameters']['locale'])) {
+// If only the built-in (English) language is available, and we are
+// performing an interactive installation, inform the user that the
+// installer can be localized. Otherwise we assume the user knows what he
+// is doing.
+if (count($locales) == 1) {
+if ($install_state['interactive']) {
+drupal_set_title(st('Choose language'));
+if (!empty($install_state['parameters']['localize'])) {
+$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>';
+$output .= '<li>Place it into the following directory:
+<pre>
+/profiles/' . $profilename . '/translations/
+</pre></li>';
+$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>';
+$output .= '<ul>';
+$output .= '<li><a href="install.php?profile=' . $profilename . '">Reload the language selection page after adding translations</a></li>';
+$output .= '<li><a href="install.php?profile=' . $profilename . '&amp;locale=en">Continue installation in English</a></li>';
+$output .= '</ul>';
+}
+else {
+include_once DRUPAL_ROOT . '/includes/form.inc';
+$elements = drupal_get_form('install_select_locale_form', $locales, $profilename);
+$output = drupal_render($elements);
+}
+return $output;
+}
+// One language, but not an interactive installation. Assume the user
+// knows what he is doing.
+$locale = current($locales);
+$install_state['parameters']['locale'] = $locale->name;
+return;
+}
+else {
+// Allow profile to pre-select the language, skipping the selection.
+$function = $profilename . '_profile_details';
+if (function_exists($function)) {
+$details = $function();
+if (isset($details['language'])) {
+foreach ($locales as $locale) {
+if ($details['language'] == $locale->name) {
+$install_state['parameters']['locale'] = $locale->name;
+return;
+}
+}
+}
+}
+// We still don't have a locale, so display a form for selecting one.
+// Only do this in the case of interactive installations, since this is
+// not a real form with submit handlers (the database isn't even set up
+// yet), rather just a convenience method for setting parameters in the
+// URL.
+if ($install_state['interactive']) {
+drupal_set_title(st('Choose language'));
+include_once DRUPAL_ROOT . '/includes/form.inc';
+$elements = drupal_get_form('install_select_locale_form', $locales, $profilename);
+return drupal_render($elements);
+}
+else {
+throw new Exception(st('Sorry, you must select a language to continue the installation.'));
+}
+}
+}
+}
+/**
+* Form constructor for the language selection form.
+*
+* @ingroup forms
+*/
+function install_select_locale_form($form, &$form_state, $locales, $profilename) {
+include_once DRUPAL_ROOT . '/includes/iso.inc';
+$languages = _locale_get_predefined_list();
+foreach ($locales as $locale) {
+$name = $locale->langcode;
+if (isset($languages[$name])) {
+$name = $languages[$name][0] . (isset($languages[$name][1]) ? ' ' . st('(@language)', array('@language' => $languages[$name][1])) : '');
+}
+$form['locale'][$locale->langcode] = array(
+'#type' => 'radio',
+'#return_value' => $locale->langcode,
+'#default_value' => $locale->langcode == 'en' ? 'en' : '',
+'#title' => $name . ($locale->langcode == 'en' ? ' ' . st('(built-in)') : ''),
+'#parents' => array('locale')
+);
+}
+if (count($locales) == 1) {
+$form['help'] = array(
+'#markup' => '<p><a href="install.php?profile=' . $profilename . '&amp;localize=true">' . st('Learn how to install Drupal in other languages') . '</a></p>',
+);
+}
+$form['actions'] = array('#type' => 'actions');
+$form['actions']['submit'] =  array(
+'#type' => 'submit',
+'#value' => st('Save and continue'),
+);
+return $form;
+}
+/**
+* Indicates that there are no profiles available.
+*/
+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.');
+}
+/**
+* Indicates that Drupal has already been installed.
+*/
+function install_already_done_error() {
+global $base_url;
+drupal_set_title(st('Drupal already installed'));
+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/update.php">update script</a>.</li><li>View your <a href="@base-url">existing site</a>.</li></ul>', array('@base-url' => $base_url));
+}
+/**
+* Loads information about the chosen profile during installation.
+*
+* @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) {
+$profile_file = DRUPAL_ROOT . '/profiles/' . $install_state['parameters']['profile'] . '/' . $install_state['parameters']['profile'] . '.profile';
+if (file_exists($profile_file)) {
+include_once $profile_file;
+$install_state['profile_info'] = install_profile_info($install_state['parameters']['profile'], $install_state['parameters']['locale']);
+}
+else {
+throw new Exception(st('Sorry, the profile you have chosen cannot be loaded.'));
+}
+}
+/**
+* Performs a full bootstrap of Drupal during installation.
+*
+* @param $install_state
+*   An array of information about the current installation state.
+*/
+function install_bootstrap_full(&$install_state) {
+drupal_bootstrap(DRUPAL_BOOTSTRAP_FULL);
+}
+/**
+* Installs required modules via a batch process.
+*
+* @param $install_state
+*   An array of information about the current installation state.
+*
+* @return
+*   The batch definition.
+*/
+function install_profile_modules(&$install_state) {
+$modules = variable_get('install_profile_modules', array());
+$files = system_rebuild_module_data();
+variable_del('install_profile_modules');
+// 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;
+}
+}
+arsort($required);
+arsort($non_required);
+$operations = array();
+foreach ($required + $non_required as $module => $weight) {
+$operations[] = array('_install_module_batch', array($module, $files[$module]->info['name']));
+}
+$batch = array(
+'operations' => $operations,
+'title' => st('Installing @drupal', array('@drupal' => drupal_install_profile_distribution_name())),
+'error_message' => st('The installation has encountered an error.'),
+'finished' => '_install_profile_modules_finished',
+);
+return $batch;
+}
+/**
+* Imports languages via a batch process during installation.
+*
+* @param $install_state
+*   An array of information about the current installation state.
+*
+* @return
+*   The batch definition, if there are language files to import.
+*/
+function install_import_locales(&$install_state) {
+include_once DRUPAL_ROOT . '/includes/locale.inc';
+$install_locale = $install_state['parameters']['locale'];
+include_once DRUPAL_ROOT . '/includes/iso.inc';
+$predefined = _locale_get_predefined_list();
+if (!isset($predefined[$install_locale])) {
+// Drupal does not know about this language, so we prefill its values with
+// our best guess. The user will be able to edit afterwards.
+locale_add_language($install_locale, $install_locale, $install_locale, LANGUAGE_LTR, '', '', TRUE, TRUE);
+}
+else {
+// A known predefined language, details will be filled in properly.
+locale_add_language($install_locale, NULL, NULL, NULL, '', '', TRUE, TRUE);
+}
+// Collect files to import for this language.
+$batch = locale_batch_by_language($install_locale, NULL);
+if (!empty($batch)) {
+// Remember components we cover in this batch set.
+variable_set('install_locale_batch_components', $batch['#components']);
+return $batch;
+}
+}
+/**
+* Form constructor for a form to configure the new site.
+*
+* @param $install_state
+*   An array of information about the current installation state.
+*
+* @see install_configure_form_validate()
+* @see install_configure_form_submit()
+* @ingroup forms
+*/
+function install_configure_form($form, &$form_state, &$install_state) {
+drupal_set_title(st('Configure site'));
+// Warn about settings.php permissions risk
+$settings_dir = conf_path();
+$settings_file = $settings_dir . '/settings.php';
+// Check that $_POST is empty so we only show this message when the form is
+// first displayed, not on the next page after it is submitted. (We do not
+// want to repeat it multiple times because it is a general warning that is
+// not related to the rest of the installation process; it would also be
+// especially out of place on the last page of the installer, where it would
+// distract from the message that the Drupal installation has completed
+// successfully.)
+if (empty($_POST) && (!drupal_verify_install_file(DRUPAL_ROOT . '/' . $settings_file, FILE_EXIST|FILE_READABLE|FILE_NOT_WRITABLE) || !drupal_verify_install_file(DRUPAL_ROOT . '/' . $settings_dir, FILE_NOT_WRITABLE, 'dir'))) {
+drupal_set_message(st('All necessary changes to %dir and %file have been made, so you should remove write permissions to them now in order to avoid security risks. If you are unsure how to do so, consult the <a href="@handbook_url">online handbook</a>.', array('%dir' => $settings_dir, '%file' => $settings_file, '@handbook_url' => 'http://drupal.org/server-permissions')), 'warning');
+}
+drupal_add_js(drupal_get_path('module', 'system') . '/system.js');
+// Add JavaScript time zone detection.
+drupal_add_js('misc/timezone.js');
+// We add these strings as settings because JavaScript translation does not
+// work during installation.
+drupal_add_js(array('copyFieldValue' => array('edit-site-mail' => array('edit-account-mail'))), 'setting');
+drupal_add_js('jQuery(function () { Drupal.cleanURLsInstallCheck(); });', 'inline');
+// Add JS to show / hide the 'Email administrator about site updates' elements
+drupal_add_js('jQuery(function () { Drupal.hideEmailAdministratorCheckbox() });', 'inline');
+// Build menu to allow clean URL check.
+menu_rebuild();
+// Cache a fully-built schema. This is necessary for any invocation of
+// index.php because: (1) setting cache table entries requires schema
+// information, (2) that occurs during bootstrap before any module are
+// loaded, so (3) if there is no cached schema, drupal_get_schema() will
+// try to generate one but with no loaded modules will return nothing.
+//
+// This logically could be done during the 'install_finished' task, but the
+// clean URL check requires it now.
+drupal_get_schema(NULL, TRUE);
+// Return the form.
+return _install_configure_form($form, $form_state, $install_state);
+}
+/**
+* Installation task; import remaining languages via a batch process.
+*
+* @param $install_state
+*   An array of information about the current installation state.
+*
+* @return
+*   The batch definition, if there are language files to import.
+*/
+function install_import_locales_remaining(&$install_state) {
+include_once DRUPAL_ROOT . '/includes/locale.inc';
+// Collect files to import for this language. Skip components already covered
+// in the initial batch set.
+$install_locale = $install_state['parameters']['locale'];
+$batch = locale_batch_by_language($install_locale, NULL, variable_get('install_locale_batch_components', array()));
+// Remove temporary variable.
+variable_del('install_locale_batch_components');
+return $batch;
+}
+/**
+* Finishes importing files at end of installation.
+*
+* @param $install_state
+*   An array of information about the current installation state.
+*
+* @return
+*   A message informing the user that the installation is complete.
+*/
+function install_finished(&$install_state) {
+drupal_set_title(st('@drupal installation complete', array('@drupal' => drupal_install_profile_distribution_name())), PASS_THROUGH);
+$messages = drupal_set_message();
+$output = '<p>' . st('Congratulations, you installed @drupal!', array('@drupal' => drupal_install_profile_distribution_name())) . '</p>';
+$output .= '<p>' . (isset($messages['error']) ? st('Review the messages above before visiting <a href="@url">your new site</a>.', array('@url' => url(''))) : st('<a href="@url">Visit your new site</a>.', array('@url' => url('')))) . '</p>';
+// Flush all caches to ensure that any full bootstraps during the installer
+// do not leave stale cached data, and that any content types or other items
+// registered by the installation profile are registered correctly.
+drupal_flush_all_caches();
+// Remember the profile which was used.
+variable_set('install_profile', drupal_get_profile());
+// Installation profiles are always loaded last
+db_update('system')
+->fields(array('weight' => 1000))
+->condition('type', 'module')
+->condition('name', drupal_get_profile())
+->execute();
+// Cache a fully-built schema.
+drupal_get_schema(NULL, TRUE);
+// Run cron to populate update status tables (if available) so that users
+// will be warned if they've installed an out of date Drupal version.
+// Will also trigger indexing of profile-supplied content or feeds.
+drupal_cron_run();
+return $output;
+}
+/**
+* Implements callback_batch_operation().
+*
+* Performs batch installation of modules.
+*/
+function _install_module_batch($module, $module_name, &$context) {
+// Install and enable the module right away, so that the module will be
+// loaded by drupal_bootstrap in subsequent batch requests, and other
+// modules possibly depending on it can safely perform their installation
+// steps.
+module_enable(array($module), FALSE);
+$context['results'][] = $module;
+$context['message'] = st('Installed %module module.', array('%module' => $module_name));
+}
+/**
+* Implements callback_batch_finished().
+*
+* 'Finished' callback for module installation batch.
+*/
+function _install_profile_modules_finished($success, $results, $operations) {
+// Flush all caches to complete the module installation process. Subsequent
+// installation tasks will now have full access to the profile's modules.
+drupal_flush_all_caches();
+}
+/**
+* Checks installation requirements and reports any errors.
+*/
+function install_check_requirements($install_state) {
+$profile = $install_state['parameters']['profile'];
+// Check the profile requirements.
+$requirements = drupal_check_profile($profile);
+// If Drupal is not set up already, we need to create a settings file.
+if (!$install_state['settings_verified']) {
+$writable = FALSE;
+$conf_path = './' . conf_path(FALSE, TRUE);
+$settings_file = $conf_path . '/settings.php';
+$default_settings_file = './sites/default/default.settings.php';
+$file = $conf_path;
+$exists = FALSE;
+// Verify that the directory exists.
+if (drupal_verify_install_file($conf_path, FILE_EXIST, 'dir')) {
+// Check if a settings.php file already exists.
+$file = $settings_file;
+if (drupal_verify_install_file($settings_file, FILE_EXIST)) {
+// If it does, make sure it is writable.
+$writable = drupal_verify_install_file($settings_file, FILE_READABLE|FILE_WRITABLE);
+$exists = TRUE;
+}
+}
+// If default.settings.php does not exist, or is not readable, throw an
+// error.
+if (!drupal_verify_install_file($default_settings_file, FILE_EXIST|FILE_READABLE)) {
+$requirements['default settings file exists'] = array(
+'title'       => st('Default settings file'),
+'value'       => st('The default settings file does not exist.'),
+'severity'    => REQUIREMENT_ERROR,
+'description' => st('The @drupal installer requires that the %default-file file not be modified in any way from the original download.', array('@drupal' => drupal_install_profile_distribution_name(), '%default-file' => $default_settings_file)),
+);
+}
+// Otherwise, if settings.php does not exist yet, we can try to copy
+// default.settings.php to create it.
+elseif (!$exists) {
+$copied = drupal_verify_install_file($conf_path, FILE_EXIST|FILE_WRITABLE, 'dir') && @copy($default_settings_file, $settings_file);
+if ($copied) {
+// If the new settings file has the same owner as default.settings.php,
+// this means default.settings.php is owned by the webserver user.
+// This is an inherent security weakness because it allows a malicious
+// webserver process to append arbitrary PHP code and then execute it.
+// However, it is also a common configuration on shared hosting, and
+// there is nothing Drupal can do to prevent it. In this situation,
+// having settings.php also owned by the webserver does not introduce
+// any additional security risk, so we keep the file in place.
+if (fileowner($default_settings_file) === fileowner($settings_file)) {
+$writable = drupal_verify_install_file($settings_file, FILE_READABLE|FILE_WRITABLE);
+$exists = TRUE;
+}
+// If settings.php and default.settings.php have different owners, this
+// probably means the server is set up "securely" (with the webserver
+// running as its own user, distinct from the user who owns all the
+// Drupal PHP files), although with either a group or world writable
+// sites directory. Keeping settings.php owned by the webserver would
+// therefore introduce a security risk. It would also cause a usability
+// problem, since site owners who do not have root access to the file
+// system would be unable to edit their settings file later on. We
+// therefore must delete the file we just created and force the
+// administrator to log on to the server and create it manually.
+else {
+$deleted = @drupal_unlink($settings_file);
+// We expect deleting the file to be successful (since we just
+// created it ourselves above), but if it fails somehow, we set a
+// variable so we can display a one-time error message to the
+// administrator at the bottom of the requirements list. We also try
+// to make the file writable, to eliminate any conflicting error
+// messages in the requirements list.
+$exists = !$deleted;
+if ($exists) {
+$settings_file_ownership_error = TRUE;
+$writable = drupal_verify_install_file($settings_file, FILE_READABLE|FILE_WRITABLE);
+}
+}
+}
+}
+// If settings.php does not exist, throw an error.
+if (!$exists) {
+$requirements['settings file exists'] = array(
+'title'       => st('Settings file'),
+'value'       => st('The settings file does not exist.'),
+'severity'    => REQUIREMENT_ERROR,
+'description' => st('The @drupal installer requires that you create a settings file as part of the installation process. Copy the %default_file file to %file. More details about installing Drupal are available in <a href="@install_txt">INSTALL.txt</a>.', array('@drupal' => drupal_install_profile_distribution_name(), '%file' => $file, '%default_file' => $default_settings_file, '@install_txt' => base_path() . 'INSTALL.txt')),
+);
+}
+else {
+$requirements['settings file exists'] = array(
+'title'       => st('Settings file'),
+'value'       => st('The %file file exists.', array('%file' => $file)),
+);
+// If settings.php is not writable, throw an error.
+if (!$writable) {
+$requirements['settings file writable'] = array(
+'title'       => st('Settings file'),
+'value'       => st('The settings file is not writable.'),
+'severity'    => REQUIREMENT_ERROR,
+'description' => st('The @drupal installer requires write permissions to %file during the installation process. If you are unsure how to grant file permissions, consult the <a href="@handbook_url">online handbook</a>.', array('@drupal' => drupal_install_profile_distribution_name(), '%file' => $file, '@handbook_url' => 'http://drupal.org/server-permissions')),
+);
+}
+else {
+$requirements['settings file'] = array(
+'title'       => st('Settings file'),
+'value'       => st('The settings file is writable.'),
+);
+}
+if (!empty($settings_file_ownership_error)) {
+$requirements['settings file ownership'] = array(
+'title'       => st('Settings file'),
+'value'       => st('The settings file is owned by the web server.'),
+'severity'    => REQUIREMENT_ERROR,
+'description' => st('The @drupal installer failed to create a settings file with proper file ownership. Log on to your web server, remove the existing %file file, and create a new one by copying the %default_file file to %file. More details about installing Drupal are available in <a href="@install_txt">INSTALL.txt</a>. If you have problems with the file permissions on your server, consult the <a href="@handbook_url">online handbook</a>.', array('@drupal' => drupal_install_profile_distribution_name(), '%file' => $file, '%default_file' => $default_settings_file, '@install_txt' => base_path() . 'INSTALL.txt', '@handbook_url' => 'http://drupal.org/server-permissions')),
+);
+}
+}
+}
+return $requirements;
+}
+/**
+* Form constructor for a site configuration form.
+*
+* @param $install_state
+*   An array of information about the current installation state.
+*
+* @see install_configure_form()
+* @see install_configure_form_validate()
+* @see install_configure_form_submit()
+* @ingroup forms
+*/
+function _install_configure_form($form, &$form_state, &$install_state) {
+include_once DRUPAL_ROOT . '/includes/locale.inc';
+$form['site_information'] = array(
+'#type' => 'fieldset',
+'#title' => st('Site information'),
+'#collapsible' => FALSE,
+);
+$form['site_information']['site_name'] = array(
+'#type' => 'textfield',
+'#title' => st('Site name'),
+'#required' => TRUE,
+'#weight' => -20,
+);
+$form['site_information']['site_mail'] = array(
+'#type' => 'textfield',
+'#title' => st('Site e-mail address'),
+'#default_value' => ini_get('sendmail_from'),
+'#description' => st("Automated e-mails, such as registration information, will be sent from this address. Use an address ending in your site's domain to help prevent these e-mails from being flagged as spam."),
+'#required' => TRUE,
+'#weight' => -15,
+);
+$form['admin_account'] = array(
+'#type' => 'fieldset',
+'#title' => st('Site maintenance account'),
+'#collapsible' => FALSE,
+);
+$form['admin_account']['account']['#tree'] = TRUE;
+$form['admin_account']['account']['name'] = array('#type' => 'textfield',
+'#title' => st('Username'),
+'#maxlength' => USERNAME_MAX_LENGTH,
+'#description' => st('Spaces are allowed; punctuation is not allowed except for periods, hyphens, and underscores.'),
+'#required' => TRUE,
+'#weight' => -10,
+'#attributes' => array('class' => array('username')),
+);
+$form['admin_account']['account']['mail'] = array('#type' => 'textfield',
+'#title' => st('E-mail address'),
+'#maxlength' => EMAIL_MAX_LENGTH,
+'#required' => TRUE,
+'#weight' => -5,
+);
+$form['admin_account']['account']['pass'] = array(
+'#type' => 'password_confirm',
+'#required' => TRUE,
+'#size' => 25,
+'#weight' => 0,
+);
+$form['server_settings'] = array(
+'#type' => 'fieldset',
+'#title' => st('Server settings'),
+'#collapsible' => FALSE,
+);
+$countries = country_get_list();
+$form['server_settings']['site_default_country'] = array(
+'#type' => 'select',
+'#title' => st('Default country'),
+'#empty_value' => '',
+'#default_value' => variable_get('site_default_country', NULL),
+'#options' => $countries,
+'#description' => st('Select the default country for the site.'),
+'#weight' => 0,
+);
+$form['server_settings']['date_default_timezone'] = array(
+'#type' => 'select',
+'#title' => st('Default time zone'),
+'#default_value' => date_default_timezone_get(),
+'#options' => system_time_zones(),
+'#description' => st('By default, dates in this site will be displayed in the chosen time zone.'),
+'#weight' => 5,
+'#attributes' => array('class' => array('timezone-detect')),
+);
+$form['server_settings']['clean_url'] = array(
+'#type' => 'hidden',
+'#default_value' => 0,
+'#attributes' => array('id' => 'edit-clean-url', 'class' => array('install')),
+);
+$form['update_notifications'] = array(
+'#type' => 'fieldset',
+'#title' => st('Update notifications'),
+'#collapsible' => FALSE,
+);
+$form['update_notifications']['update_status_module'] = array(
+'#type' => 'checkboxes',
+'#options' => array(
+1 => st('Check for updates automatically'),
+2 => st('Receive e-mail notifications'),
+),
+'#default_value' => array(1, 2),
+'#description' => st('The system will notify you when updates and important security releases are available for installed components. Anonymous information about your site is sent to <a href="@drupal">Drupal.org</a>.', array('@drupal' => 'http://drupal.org')),
+'#weight' => 15,
+);
+$form['actions'] = array('#type' => 'actions');
+$form['actions']['submit'] = array(
+'#type' => 'submit',
+'#value' => st('Save and continue'),
+'#weight' => 15,
+);
+return $form;
+}
+/**
+* Form validation handler for install_configure_form().
+*
+* @see install_configure_form_submit()
+*/
+function install_configure_form_validate($form, &$form_state) {
+if ($error = user_validate_name($form_state['values']['account']['name'])) {
+form_error($form['admin_account']['account']['name'], $error);
+}
+if ($error = user_validate_mail($form_state['values']['account']['mail'])) {
+form_error($form['admin_account']['account']['mail'], $error);
+}
+if ($error = user_validate_mail($form_state['values']['site_mail'])) {
+form_error($form['site_information']['site_mail'], $error);
+}
+}
+/**
+* Form submission handler for install_configure_form().
+*
+* @see install_configure_form_validate()
+*/
+function install_configure_form_submit($form, &$form_state) {
+global $user;
+variable_set('site_name', $form_state['values']['site_name']);
+variable_set('site_mail', $form_state['values']['site_mail']);
+variable_set('date_default_timezone', $form_state['values']['date_default_timezone']);
+variable_set('site_default_country', $form_state['values']['site_default_country']);
+// Enable update.module if this option was selected.
+if ($form_state['values']['update_status_module'][1]) {
+module_enable(array('update'), FALSE);
+// Add the site maintenance account's email address to the list of
+// addresses to be notified when updates are available, if selected.
+if ($form_state['values']['update_status_module'][2]) {
+variable_set('update_notify_emails', array($form_state['values']['account']['mail']));
+}
+}
+// We precreated user 1 with placeholder values. Let's save the real values.
+$account = user_load(1);
+$merge_data = array('init' => $form_state['values']['account']['mail'], 'roles' => !empty($account->roles) ? $account->roles : array(), 'status' => 1, 'timezone' => $form_state['values']['date_default_timezone']);
+user_save($account, array_merge($form_state['values']['account'], $merge_data));
+// Load global $user and perform final login tasks.
+$user = user_load(1);
+user_login_finalize();
+if (isset($form_state['values']['clean_url'])) {
+variable_set('clean_url', $form_state['values']['clean_url']);
+}
+// Record when this install ran.
+variable_set('install_time', $_SERVER['REQUEST_TIME']);
+}