/**
 * The Drupal installation happens in a series of steps. We begin by verifying
 * that the current environment meets our minimum requirements. We then go
 * on to verify that settings.php is properly configured. From there we
 * connect to the configured database and verify that it meets our minimum
 * requirements. Finally we can allow the user to select an installation
 * profile and complete the installation process.
 *
 * @param $phase
 *   The installation phase we should proceed to.
 */
function install_main()
{
    require_once './includes/bootstrap.inc';
    drupal_bootstrap(DRUPAL_BOOTSTRAP_CONFIGURATION);
    // The user agent header is used to pass a database prefix in the request when
    // running tests. However, for security reasons, it is imperative that no
    // installation be permitted using such a prefix.
    if (isset($_SERVER['HTTP_USER_AGENT']) && strpos($_SERVER['HTTP_USER_AGENT'], "simpletest") !== FALSE) {
        header($_SERVER['SERVER_PROTOCOL'] . ' 403 Forbidden');
        exit;
    }
    // This must go after drupal_bootstrap(), which unsets globals!
    global $profile, $install_locale, $conf;
    require_once './modules/system/system.install';
    require_once './includes/file.inc';
    // Ensure correct page headers are sent (e.g. caching)
    drupal_page_header();
    // Set up $language, so t() caller functions will still work.
    drupal_init_language();
    // Load module basics (needed for hook invokes).
    include_once './includes/module.inc';
    $module_list['system']['filename'] = 'modules/system/system.module';
    $module_list['filter']['filename'] = 'modules/filter/filter.module';
    module_list(TRUE, FALSE, FALSE, $module_list);
    drupal_load('module', 'system');
    drupal_load('module', 'filter');
    // Install profile chosen, set the global immediately.
    // This needs to be done before the theme cache gets
    // initialized in drupal_maintenance_theme().
    if (!empty($_GET['profile'])) {
        $profile = preg_replace('/[^a-zA-Z_0-9]/', '', $_GET['profile']);
    }
    // Set up theme system for the maintenance page.
    drupal_maintenance_theme();
    // Check existing settings.php.
    $verify = install_verify_settings();
    if ($verify) {
        // Since we have a database connection, we use the normal cache system.
        // This is important, as the installer calls into the Drupal system for
        // the clean URL checks, so we should maintain the cache properly.
        require_once './includes/cache.inc';
        $conf['cache_inc'] = './includes/cache.inc';
        // Establish a connection to the database.
        require_once './includes/database.inc';
        db_set_active();
        // Check if Drupal is installed.
        $task = install_verify_drupal();
        if ($task == 'done') {
            install_already_done_error();
        }
    } else {
        // Since no persistent storage is available yet, and functions that check
        // for cached data will fail, we temporarily replace the normal cache
        // system with a stubbed-out version that short-circuits the actual
        // caching process and avoids any errors.
        require_once './includes/cache-install.inc';
        $conf['cache_inc'] = './includes/cache-install.inc';
        $task = NULL;
    }
    // No profile was passed in GET, ask the user.
    if (empty($_GET['profile'])) {
        if ($profile = install_select_profile()) {
            install_goto("install.php?profile={$profile}");
        } else {
            install_no_profile_error();
        }
    }
    // Load the profile.
    require_once "./profiles/{$profile}/{$profile}.profile";
    // Locale selection
    if (!empty($_GET['locale'])) {
        $install_locale = preg_replace('/[^a-zA-Z_0-9\\-]/', '', $_GET['locale']);
    } elseif (($install_locale = install_select_locale($profile)) !== FALSE) {
        install_goto("install.php?profile={$profile}&locale={$install_locale}");
    }
    // Tasks come after the database is set up
    if (!$task) {
        global $db_url;
        if (!$verify && !empty($db_url)) {
            // Do not install over a configured settings.php.
            install_already_done_error();
        }
        // Check the installation requirements for Drupal and this profile.
        install_check_requirements($profile, $verify);
        // Verify existence of all required modules.
        $modules = drupal_verify_profile($profile, $install_locale);
        // If any error messages are set now, it means a requirement problem.
        $messages = drupal_set_message();
        if (!empty($messages['error'])) {
//.........这里部分代码省略.........

/**
 * Helper function for automatically selecting an installation profile from a
 * list or from a selection passed in via $_POST.
 */
function _install_select_profile($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 $profile->uri;
        return $profile->name;
    } else {
        foreach ($profiles as $profile) {
            if (!empty($_POST['profile']) && $_POST['profile'] == $profile->name) {
                return $profile->name;
            }
        }
    }
}

/**
 * The Drupal installation happens in a series of steps. We begin by verifying
 * that the current environment meets our minimum requirements. We then go
 * on to verify that settings.php is properly configured. From there we
 * connect to the configured database and verify that it meets our minimum
 * requirements. Finally we can allow the user to select an installation
 * profile and complete the installation process.
 *
 * @param $phase
 *   The installation phase we should proceed to.
 */
function install_main()
{
    require_once './includes/bootstrap.inc';
    drupal_bootstrap(DRUPAL_BOOTSTRAP_CONFIGURATION);
    // This must go after drupal_bootstrap(), which unsets globals!
    global $profile, $install_locale;
    require_once './modules/system/system.install';
    require_once './includes/file.inc';
    // Ensure correct page headers are sent (e.g. caching)
    drupal_page_header();
    // Check existing settings.php.
    $verify = install_verify_settings();
    // Drupal may already be installed.
    if ($verify) {
        // Establish a connection to the database.
        require_once './includes/database.inc';
        db_set_active();
        // Check if Drupal is installed.
        if (install_verify_drupal()) {
            install_already_done_error();
        }
    }
    // Load module basics (needed for hook invokes).
    include_once './includes/module.inc';
    $module_list['system']['filename'] = 'modules/system/system.module';
    $module_list['filter']['filename'] = 'modules/filter/filter.module';
    module_list(TRUE, FALSE, FALSE, $module_list);
    drupal_load('module', 'system');
    drupal_load('module', 'filter');
    // Decide which profile to use.
    if (!empty($_GET['profile'])) {
        $profile = preg_replace('/[^a-zA-Z_0-9]/', '', $_GET['profile']);
    } elseif ($profile = install_select_profile()) {
        install_goto("install.php?profile={$profile}");
    } else {
        install_no_profile_error();
    }
    // Locale selection
    if (!empty($_GET['locale'])) {
        $install_locale = preg_replace('/[^a-zA-Z_0-9]/', '', $_GET['locale']);
    } elseif (($install_locale = install_select_locale($profile)) !== FALSE) {
        install_goto("install.php?profile={$profile}&locale={$install_locale}");
    }
    // Load the profile.
    require_once "./profiles/{$profile}/{$profile}.profile";
    // Check the installation requirements for Drupal and this profile.
    install_check_requirements($profile);
    // Change the settings.php information if verification failed earlier.
    // Note: will trigger a redirect if database credentials change.
    if (!$verify) {
        install_change_settings($profile, $install_locale);
    }
    // Verify existence of all required modules.
    $modules = drupal_verify_profile($profile, $install_locale);
    if (!$modules) {
        install_missing_modules_error($profile);
    }
    // Perform actual installation defined in the profile.
    drupal_install_profile($profile, $modules);
    // Warn about settings.php permissions risk
    $settings_file = './' . conf_path() . '/settings.php';
    if (!drupal_verify_install_file($settings_file, FILE_EXIST | FILE_READABLE | FILE_NOT_WRITABLE)) {
        drupal_set_message(st('All necessary changes to %file have been made, so you should now remove write permissions to this file. Failure to remove write permissions to this file is a security risk.', array('%file' => $settings_file)), 'error');
    } else {
        drupal_set_message(st('All necessary changes to %file have been made. It has been set to read-only for security.', array('%file' => $settings_file)));
    }
    // Show end page.
    install_complete($profile);
}

/**
 * The Drupal installation happens in a series of steps. We begin by verifying
 * that the current environment meets our minimum requirements. We then go
 * on to verify that settings.php is properly configured. From there we
 * connect to the configured database and verify that it meets our minimum
 * requirements. Finally we can allow the user to select an installation
 * profile and complete the installation process.
 *
 * @param $phase
 *   The installation phase we should proceed to.
 */
function install_main()
{
    require_once DRUPAL_ROOT . '/includes/bootstrap.inc';
    drupal_bootstrap(DRUPAL_BOOTSTRAP_CONFIGURATION);
    // The user agent header is used to pass a database prefix in the request when
    // running tests. However, for security reasons, it is imperative that no
    // installation be permitted using such a prefix.
    if (isset($_SERVER['HTTP_USER_AGENT']) && strpos($_SERVER['HTTP_USER_AGENT'], "simpletest") !== FALSE) {
        header($_SERVER['SERVER_PROTOCOL'] . ' 403 Forbidden');
        exit;
    }
    // This must go after drupal_bootstrap(), which unsets globals!
    global $profile, $install_locale, $conf;
    require_once DRUPAL_ROOT . '/modules/system/system.install';
    require_once DRUPAL_ROOT . '/includes/file.inc';
    // Ensure correct page headers are sent (e.g. caching)
    drupal_page_header();
    // Set up $language, so t() caller functions will still work.
    drupal_init_language();
    // Load module basics (needed for hook invokes).
    include_once DRUPAL_ROOT . '/includes/module.inc';
    $module_list['system']['filename'] = 'modules/system/system.module';
    $module_list['filter']['filename'] = 'modules/filter/filter.module';
    module_list(TRUE, FALSE, FALSE, $module_list);
    drupal_load('module', 'system');
    drupal_load('module', 'filter');
    // 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-install.inc';
    $conf['cache_inc'] = './includes/cache-install.inc';
    // Install profile chosen, set the global immediately.
    // This needs to be done before the theme cache gets
    // initialized in drupal_maintenance_theme().
    if (!empty($_GET['profile'])) {
        $profile = preg_replace('/[^a-zA-Z_0-9]/', '', $_GET['profile']);
    }
    // Set up theme system for the maintenance page.
    drupal_maintenance_theme();
    // Check existing settings.php.
    $verify = install_verify_settings();
    if ($verify) {
        // Establish a connection to the database.
        require_once DRUPAL_ROOT . '/includes/database.inc';
        db_set_active();
        // Check if Drupal is installed.
        $task = install_verify_drupal();
        if ($task == 'done') {
            install_already_done_error();
        }
    } else {
        $task = NULL;
    }
    // No profile was passed in GET, ask the user.
    if (empty($_GET['profile'])) {
        if ($profile = install_select_profile()) {
            install_goto("install.php?profile={$profile}");
        } else {
            install_no_profile_error();
        }
    }
    // Load the profile.
    require_once DRUPAL_ROOT . "/profiles/{$profile}/{$profile}.profile";
    // Locale selection
    if (!empty($_GET['locale'])) {
        $install_locale = preg_replace('/[^a-zA-Z_0-9\\-]/', '', $_GET['locale']);
    } elseif (($install_locale = install_select_locale($profile)) !== FALSE) {
        install_goto("install.php?profile={$profile}&locale={$install_locale}");
    }
    // Tasks come after the database is set up
    if (!$task) {
        global $db_url;
        if (!$verify && !empty($db_url)) {
            // Do not install over a configured settings.php.
            install_already_done_error();
        }
        // Check the installation requirements for Drupal and this profile.
        install_check_requirements($profile, $verify);
        // Verify existence of all required modules.
        $modules = drupal_verify_profile($profile, $install_locale);
        // If any error messages are set now, it means a requirement problem.
        $messages = drupal_set_message();
        if (!empty($messages['error'])) {
//.........这里部分代码省略.........