Issue #22336 by quicksketch, scor, boombatower, and rfay. Move all core Drupal files under a core subdirectory.

1 files changed, 1307 insertions, 0 deletions

diff --git a/core/includes/install.inc b/core/includes/install.inc
new file mode 100644
index 00000000000..a960d25fd5e
--- /dev/null
+++ b/core/includes/install.inc
@@ -0,0 +1,1307 @@
+<?php
+
+/**
+ * Indicates that a module has not been installed yet.
+ */
+define('SCHEMA_UNINSTALLED', -1);
+
+/**
+ * Indicates that a module has been installed.
+ */
+define('SCHEMA_INSTALLED', 0);
+
+/**
+ * Requirement severity -- Informational message only.
+ */
+define('REQUIREMENT_INFO', -1);
+
+/**
+ * Requirement severity -- Requirement successfully met.
+ */
+define('REQUIREMENT_OK', 0);
+
+/**
+ * Requirement severity -- Warning condition; proceed but flag warning.
+ */
+define('REQUIREMENT_WARNING', 1);
+
+/**
+ * Requirement severity -- Error condition; abort installation.
+ */
+define('REQUIREMENT_ERROR', 2);
+
+/**
+ * File permission check -- File exists.
+ */
+define('FILE_EXIST', 1);
+
+/**
+ * File permission check -- File is readable.
+ */
+define('FILE_READABLE', 2);
+
+/**
+ * File permission check -- File is writable.
+ */
+define('FILE_WRITABLE', 4);
+
+/**
+ * File permission check -- File is executable.
+ */
+define('FILE_EXECUTABLE', 8);
+
+/**
+ * File permission check -- File does not exist.
+ */
+define('FILE_NOT_EXIST', 16);
+
+/**
+ * File permission check -- File is not readable.
+ */
+define('FILE_NOT_READABLE', 32);
+
+/**
+ * File permission check -- File is not writable.
+ */
+define('FILE_NOT_WRITABLE', 64);
+
+/**
+ * File permission check -- File is not executable.
+ */
+define('FILE_NOT_EXECUTABLE', 128);
+
+/**
+ * Initialize the update system by loading all installed module's .install files.
+ */
+function drupal_load_updates() {
+  foreach (drupal_get_installed_schema_version(NULL, FALSE, TRUE) as $module => $schema_version) {
+    if ($schema_version > -1) {
+      module_load_install($module);
+    }
+  }
+}
+
+/**
+ * Returns an array of available schema versions for a module.
+ *
+ * @param $module
+ *   A module name.
+ * @return
+ *   If the module has updates, an array of available updates sorted by version.
+ *   Otherwise, FALSE.
+ */
+function drupal_get_schema_versions($module) {
+  $updates = &drupal_static(__FUNCTION__, NULL);
+  if (!isset($updates[$module])) {
+    $updates = array();
+
+    foreach (module_list() as $loaded_module) {
+      $updates[$loaded_module] = array();
+    }
+
+    // Prepare regular expression to match all possible defined hook_update_N().
+    $regexp = '/^(?P<module>.+)_update_(?P<version>\d+)$/';
+    $functions = get_defined_functions();
+    // Narrow this down to functions ending with an integer, since all
+    // hook_update_N() functions end this way, and there are other
+    // possible functions which match '_update_'. We use preg_grep() here
+    // instead of foreaching through all defined functions, since the loop
+    // through all PHP functions can take significant page execution time
+    // and this function is called on every administrative page via
+    // system_requirements().
+    foreach (preg_grep('/_\d+$/', $functions['user']) as $function) {
+      // If this function is a module update function, add it to the list of
+      // module updates.
+      if (preg_match($regexp, $function, $matches)) {
+        $updates[$matches['module']][] = $matches['version'];
+      }
+    }
+    // Ensure that updates are applied in numerical order.
+    foreach ($updates as &$module_updates) {
+      sort($module_updates, SORT_NUMERIC);
+    }
+  }
+  return empty($updates[$module]) ? FALSE : $updates[$module];
+}
+
+/**
+ * Returns the currently installed schema version for a module.
+ *
+ * @param $module
+ *   A module name.
+ * @param $reset
+ *   Set to TRUE after modifying the system table.
+ * @param $array
+ *   Set to TRUE if you want to get information about all modules in the
+ *   system.
+ * @return
+ *   The currently installed schema version, or SCHEMA_UNINSTALLED if the
+ *   module is not installed.
+ */
+function drupal_get_installed_schema_version($module, $reset = FALSE, $array = FALSE) {
+  static $versions = array();
+
+  if ($reset) {
+    $versions = array();
+  }
+
+  if (!$versions) {
+    $versions = array();
+    $result = db_query("SELECT name, schema_version FROM {system} WHERE type = :type", array(':type' => 'module'));
+    foreach ($result as $row) {
+      $versions[$row->name] = $row->schema_version;
+    }
+  }
+
+  if ($array) {
+    return $versions;
+  }
+  else {
+    return isset($versions[$module]) ? $versions[$module] : SCHEMA_UNINSTALLED;
+  }
+}
+
+/**
+ * Update the installed version information for a module.
+ *
+ * @param $module
+ *   A module name.
+ * @param $version
+ *   The new schema version.
+ */
+function drupal_set_installed_schema_version($module, $version) {
+  db_update('system')
+    ->fields(array('schema_version' => $version))
+    ->condition('name', $module)
+    ->execute();
+
+  // Reset the static cache of module schema versions.
+  drupal_get_installed_schema_version(NULL, TRUE);
+}
+
+/**
+ * Loads the install profile, extracting its defined distribution name.
+ *
+ * @return
+ *   The distribution name defined in the profile's .info file. Defaults to
+ *   "Drupal" if none is explicitly provided by the install profile.
+ *
+ * @see install_profile_info()
+ */
+function drupal_install_profile_distribution_name() {
+  // During installation, the profile information is stored in the global
+  // installation state (it might not be saved anywhere yet).
+  if (drupal_installation_attempted()) {
+    global $install_state;
+    return $install_state['profile_info']['distribution_name'];
+  }
+  // At all other times, we load the profile via standard methods.
+  else {
+    $profile = drupal_get_profile();
+    $info = system_get_info('module', $profile);
+    return $info['distribution_name'];
+  }
+}
+
+/**
+ * Auto detect the base_url with PHP predefined variables.
+ *
+ * @param $file
+ *   The name of the file calling this function so we can strip it out of
+ *   the URI when generating the base_url.
+ * @return
+ *   The auto-detected $base_url that should be configured in settings.php
+ */
+function drupal_detect_baseurl($file = 'install.php') {
+  $proto = $_SERVER['HTTPS'] ? 'https://' : 'http://';
+  $host = $_SERVER['SERVER_NAME'];
+  $port = ($_SERVER['SERVER_PORT'] == 80 ? '' : ':' . $_SERVER['SERVER_PORT']);
+  $uri = preg_replace("/\?.*/", '', $_SERVER['REQUEST_URI']);
+  $dir = str_replace("/$file", '', $uri);
+
+  return "$proto$host$port$dir";
+}
+
+/**
+ * Detect all supported databases that are compiled into PHP.
+ *
+ * @return
+ *  An array of database types compiled into PHP.
+ */
+function drupal_detect_database_types() {
+  $databases = drupal_get_database_types();
+
+  foreach ($databases as $driver => $installer) {
+    $databases[$driver] = $installer->name();
+  }
+
+  return $databases;
+}
+
+/**
+ * Return all supported database installer objects that are compiled into PHP.
+ *
+ * @return
+ *  An array of database installer objects compiled into PHP.
+ */
+function drupal_get_database_types() {
+  $databases = array();
+
+  // We define a driver as a directory in /includes/database that in turn
+  // contains a database.inc file. That allows us to drop in additional drivers
+  // without modifying the installer.
+  // Because we have no registry yet, we need to also include the install.inc
+  // file for the driver explicitly.
+  require_once DRUPAL_ROOT . '/includes/database/database.inc';
+  foreach (file_scan_directory(DRUPAL_ROOT . '/includes/database', '/^[a-z]*$/i', array('recurse' => FALSE)) as $file) {
+    if (file_exists($file->uri . '/database.inc') && file_exists($file->uri . '/install.inc')) {
+      $drivers[$file->filename] = $file->uri;
+    }
+  }
+
+  foreach ($drivers as $driver => $file) {
+    $installer = db_installer_object($driver);
+    if ($installer->installable()) {
+      $databases[$driver] = $installer;
+    }
+  }
+
+  // Usability: unconditionally put the MySQL driver on top.
+  if (isset($databases['mysql'])) {
+    $mysql_database = $databases['mysql'];
+    unset($databases['mysql']);
+    $databases = array('mysql' => $mysql_database) + $databases;
+  }
+
+  return $databases;
+}
+
+/**
+ * Database installer structure.
+ *
+ * Defines basic Drupal requirements for databases.
+ */
+abstract class DatabaseTasks {
+
+  /**
+   * Structure that describes each task to run.
+   *
+   * @var array
+   *
+   * Each value of the tasks array is an associative array defining the function
+   * to call (optional) and any arguments to be passed to the function.
+   */
+  protected $tasks = array(
+    array(
+      'function'    => 'checkEngineVersion',
+      'arguments'   => array(),
+    ),
+    array(
+      'arguments'   => array(
+        'CREATE TABLE {drupal_install_test} (id int NULL)',
+        'Drupal can use CREATE TABLE database commands.',
+        'Failed to <strong>CREATE</strong> a test table on your database server with the command %query. The server reports the following message: %error.<p>Are you sure the configured username has the necessary permissions to create tables in the database?</p>',
+        TRUE,
+      ),
+    ),
+    array(
+      'arguments'   => array(
+        'INSERT INTO {drupal_install_test} (id) VALUES (1)',
+        'Drupal can use INSERT database commands.',
+        'Failed to <strong>INSERT</strong> a value into a test table on your database server. We tried inserting a value with the command %query and the server reported the following error: %error.',
+      ),
+    ),
+    array(
+      'arguments'   => array(
+        'UPDATE {drupal_install_test} SET id = 2',
+        'Drupal can use UPDATE database commands.',
+        'Failed to <strong>UPDATE</strong> a value in a test table on your database server. We tried updating a value with the command %query and the server reported the following error: %error.',
+      ),
+    ),
+    array(
+      'arguments'   => array(
+        'DELETE FROM {drupal_install_test}',
+        'Drupal can use DELETE database commands.',
+        'Failed to <strong>DELETE</strong> a value from a test table on your database server. We tried deleting a value with the command %query and the server reported the following error: %error.',
+      ),
+    ),
+    array(
+      'arguments'   => array(
+        'DROP TABLE {drupal_install_test}',
+        'Drupal can use DROP TABLE database commands.',
+        'Failed to <strong>DROP</strong> a test table from your database server. We tried dropping a table with the command %query and the server reported the following error %error.',
+      ),
+    ),
+  );
+
+  /**
+   * Results from tasks.
+   *
+   * @var array
+   */
+  protected $results = array();
+
+  /**
+   * Ensure the PDO driver is supported by the version of PHP in use.
+   */
+  protected function hasPdoDriver() {
+    return in_array($this->pdoDriver, PDO::getAvailableDrivers());
+  }
+
+  /**
+   * Assert test as failed.
+   */
+  protected function fail($message) {
+    $this->results[$message] = FALSE;
+  }
+
+  /**
+   * Assert test as a pass.
+   */
+  protected function pass($message) {
+    $this->results[$message] = TRUE;
+  }
+
+  /**
+   * Check whether Drupal is installable on the database.
+   */
+  public function installable() {
+    return $this->hasPdoDriver() && empty($this->error);
+  }
+
+  /**
+   * Return the human-readable name of the driver.
+   */
+  abstract public function name();
+
+  /**
+   * Return the minimum required version of the engine.
+   *
+   * @return
+   *   A version string. If not NULL, it will be checked against the version
+   *   reported by the Database engine using version_compare().
+   */
+  public function minimumVersion() {
+    return NULL;
+  }
+
+  /**
+   * Run database tasks and tests to see if Drupal can run on the database.
+   */
+  public function runTasks() {
+    // We need to establish a connection before we can run tests.
+    if ($this->connect()) {
+      foreach ($this->tasks as $task) {
+        if (!isset($task['function'])) {
+          $task['function'] = 'runTestQuery';
+        }
+        if (method_exists($this, $task['function'])) {
+          // Returning false is fatal. No other tasks can run.
+          if (FALSE === call_user_func_array(array($this, $task['function']), $task['arguments'])) {
+            break;
+          }
+        }
+        else {
+          throw new DatabaseTaskException(st("Failed to run all tasks against the database server. The task %task wasn't found.", array('%task' => $task['function'])));
+        }
+      }
+    }
+    // Check for failed results and compile message
+    $message = '';
+    foreach ($this->results as $result => $success) {
+      if (!$success) {
+        $message .= '<p class="error">' . $result  . '</p>';
+      }
+    }
+    if (!empty($message)) {
+      $message = '<p>In order for Drupal to work, and to continue with the installation process, you must resolve all issues reported below. For more help with configuring your database server, see the <a href="http://drupal.org/getting-started/install">installation handbook</a>. If you are unsure what any of this means you should probably contact your hosting provider.</p>' . $message;
+      throw new DatabaseTaskException($message);
+    }
+  }
+
+  /**
+   * Check if we can connect to the database.
+   */
+  protected function connect() {
+    try {
+      // This doesn't actually test the connection.
+      db_set_active();
+      // Now actually do a check.
+      Database::getConnection();
+      $this->pass('Drupal can CONNECT to the database ok.');
+    }
+    catch (Exception $e) {
+      $this->fail(st('Failed to connect to your database server. The server reports the following message: %error.<ul><li>Is the database server running?</li><li>Does the database exist, and have you entered the correct database name?</li><li>Have you entered the correct username and password?</li><li>Have you entered the correct database hostname?</li></ul>', array('%error' => $e->getMessage())));
+      return FALSE;
+    }
+    return TRUE;
+  }
+
+  /**
+   * Run SQL tests to ensure the database can execute commands with the current user.
+   */
+  protected function runTestQuery($query, $pass, $fail, $fatal = FALSE) {
+    try {
+      db_query($query);
+      $this->pass(st($pass));
+    }
+    catch (Exception $e) {
+      $this->fail(st($fail, array('%query' => $query, '%error' => $e->getMessage(), '%name' => $this->name())));
+      return !$fatal;
+    }
+  }
+
+  /**
+   * Check the engine version.
+   */
+  protected function checkEngineVersion() {
+    if ($this->minimumVersion() && version_compare(Database::getConnection()->version(), $this->minimumVersion(), '<')) {
+      $this->fail(st("The database version %version is less than the minimum required version %minimum_version.", array('%version' => Database::getConnection()->version(), '%minimum_version' => $this->minimumVersion())));
+    }
+  }
+
+  /**
+   * Return driver specific configuration options.
+   *
+   * @param $database
+   *  An array of driver specific configuration options.
+   *
+   * @return
+   *   The options form array.
+   */
+  public function getFormOptions($database) {
+    $form['database'] = array(
+      '#type' => 'textfield',
+      '#title' => st('Database name'),
+      '#default_value' => empty($database['database']) ? '' : $database['database'],
+      '#size' => 45,
+      '#required' => TRUE,
+      '#description' => st('The name of the database your @drupal data will be stored in. It must exist on your server before @drupal can be installed.', array('@drupal' => drupal_install_profile_distribution_name())),
+    );
+
+    $form['username'] = array(
+      '#type' => 'textfield',
+      '#title' => st('Database username'),
+      '#default_value' => empty($database['username']) ? '' : $database['username'],
+      '#required' => TRUE,
+      '#size' => 45,
+    );
+
+    $form['password'] = array(
+      '#type' => 'password',
+      '#title' => st('Database password'),
+      '#default_value' => empty($database['password']) ? '' : $database['password'],
+      '#required' => FALSE,
+      '#size' => 45,
+    );
+
+    $form['advanced_options'] = array(
+      '#type' => 'fieldset',
+      '#title' => st('Advanced options'),
+      '#collapsible' => TRUE,
+      '#collapsed' => TRUE,
+      '#description' => st("These options are only necessary for some sites. If you're not sure what you should enter here, leave the default settings or check with your hosting provider."),
+      '#weight' => 10,
+    );
+
+    $profile = drupal_get_profile();
+    $db_prefix = ($profile == 'standard') ? 'drupal_' : $profile . '_';
+    $form['advanced_options']['db_prefix'] = array(
+      '#type' => 'textfield',
+      '#title' => st('Table prefix'),
+      '#default_value' => '',
+      '#size' => 45,
+      '#description' => st('If more than one application will be sharing this database, enter a table prefix such as %prefix for your @drupal site here.', array('@drupal' => drupal_install_profile_distribution_name(), '%prefix' => $db_prefix)),
+      '#weight' => 10,
+    );
+
+    $form['advanced_options']['host'] = array(
+      '#type' => 'textfield',
+      '#title' => st('Database host'),
+      '#default_value' => empty($database['host']) ? 'localhost' : $database['host'],
+      '#size' => 45,
+      // Hostnames can be 255 characters long.
+      '#maxlength' => 255,
+      '#required' => TRUE,
+      '#description' => st('If your database is located on a different server, change this.'),
+    );
+
+    $form['advanced_options']['port'] = array(
+      '#type' => 'textfield',
+      '#title' => st('Database port'),
+      '#default_value' => empty($database['port']) ? '' : $database['port'],
+      '#size' => 45,
+      // The maximum port number is 65536, 5 digits.
+      '#maxlength' => 5,
+      '#description' => st('If your database server is listening to a non-standard port, enter its number.'),
+    );
+
+    return $form;
+  }
+
+  /**
+   * Validates driver specific configuration settings.
+   *
+   * Checks to ensure correct basic database settings and that a proper
+   * connection to the database can be established.
+   *
+   * @param $database
+   *   An array of driver specific configuration options.
+   *
+   * @return
+   *   An array of driver configuration errors, keyed by form element name.
+   */
+  public function validateDatabaseSettings($database) {
+    $errors = array();
+
+    // Verify the table prefix.
+    if (!empty($database['prefix']) && is_string($database['prefix']) && !preg_match('/^[A-Za-z0-9_.]+$/', $database['prefix'])) {
+      $errors[$database['driver'] . '][advanced_options][db_prefix'] = st('The database table prefix you have entered, %prefix, is invalid. The table prefix can only contain alphanumeric characters, periods, or underscores.', array('%prefix' => $database['prefix']));
+    }
+
+    // Verify the database port.
+    if (!empty($database['port']) && !is_numeric($database['port'])) {
+      $errors[$database['driver'] . '][advanced_options][port'] =  st('Database port must be a number.');
+    }
+
+    return $errors;
+  }
+
+}
+
+/**
+ * Exception thrown if the database installer fails.
+ */
+class DatabaseTaskException extends Exception {
+}
+
+/**
+ * Replace values in settings.php with values in the submitted array.
+ *
+ * @param $settings
+ *   An array of settings that need to be updated.
+ */
+function drupal_rewrite_settings($settings = array()) {
+  $default_settings = 'sites/default/default.settings.php';
+  drupal_static_reset('conf_path');
+  $settings_file = conf_path(FALSE) . '/settings.php';
+
+  // Build list of setting names and insert the values into the global namespace.
+  $keys = array();
+  foreach ($settings as $setting => $data) {
+    $GLOBALS[$setting] = $data['value'];
+    $keys[] = $setting;
+  }
+
+  $buffer = NULL;
+  $first = TRUE;
+  if ($fp = fopen(DRUPAL_ROOT . '/' . $default_settings, 'r')) {
+    // Step line by line through settings.php.
+    while (!feof($fp)) {
+      $line = fgets($fp);
+      if ($first && substr($line, 0, 5) != '<?php') {
+        $buffer = "<?php\n\n";
+      }
+      $first = FALSE;
+      // Check for constants.
+      if (substr($line, 0, 7) == 'define(') {
+        preg_match('/define\(\s*[\'"]([A-Z_-]+)[\'"]\s*,(.*?)\);/', $line, $variable);
+        if (in_array($variable[1], $keys)) {
+          $setting = $settings[$variable[1]];
+          $buffer .= str_replace($variable[2], " '" . $setting['value'] . "'", $line);
+          unset($settings[$variable[1]]);
+          unset($settings[$variable[2]]);
+        }
+        else {
+          $buffer .= $line;
+        }
+      }
+      // Check for variables.
+      elseif (substr($line, 0, 1) == '$') {
+        preg_match('/\$([^ ]*) /', $line, $variable);
+        if (in_array($variable[1], $keys)) {
+          // Write new value to settings.php in the following format:
+          //    $'setting' = 'value'; // 'comment'
+          $setting = $settings[$variable[1]];
+          $buffer .= '$' . $variable[1] . " = " . var_export($setting['value'], TRUE) . ";" . (!empty($setting['comment']) ? ' // ' . $setting['comment'] . "\n" : "\n");
+          unset($settings[$variable[1]]);
+        }
+        else {
+          $buffer .= $line;
+        }
+      }
+      else {
+        $buffer .= $line;
+      }
+    }
+    fclose($fp);
+
+    // Add required settings that were missing from settings.php.
+    foreach ($settings as $setting => $data) {
+      if ($data['required']) {
+        $buffer .= "\$$setting = " . var_export($data['value'], TRUE) . ";\n";
+      }
+    }
+
+    $fp = fopen(DRUPAL_ROOT . '/' . $settings_file, 'w');
+    if ($fp && fwrite($fp, $buffer) === FALSE) {
+      throw new Exception(st('Failed to modify %settings. Verify the file permissions.', array('%settings' => $settings_file)));
+    }
+  }
+  else {
+    throw new Exception(st('Failed to open %settings. Verify the file permissions.', array('%settings' => $default_settings)));
+  }
+}
+
+/**
+ * Verify an install profile for installation.
+ *
+ * @param $install_state
+ *   An array of information about the current installation state.
+ * @return
+ *   The list of modules to install.
+ */
+function drupal_verify_profile($install_state) {
+  $profile = $install_state['parameters']['profile'];
+  $locale = $install_state['parameters']['locale'];
+
+  include_once DRUPAL_ROOT . '/includes/file.inc';
+  include_once DRUPAL_ROOT . '/includes/common.inc';
+
+  $profile_file = DRUPAL_ROOT . "/profiles/$profile/$profile.profile";
+
+  if (!isset($profile) || !file_exists($profile_file)) {
+    throw new Exception(install_no_profile_error());
+  }
+  $info = $install_state['profile_info'];
+
+  // Get a list of modules that exist in Drupal's assorted subdirectories.
+  $present_modules = array();
+  foreach (drupal_system_listing('/^' . DRUPAL_PHP_FUNCTION_PATTERN . '\.module$/', 'modules', 'name', 0) as $present_module) {
+    $present_modules[] = $present_module->name;
+  }
+
+  // The install profile is also a module, which needs to be installed after all the other dependencies
+  // have been installed.
+  $present_modules[] = drupal_get_profile();
+
+  // Verify that all of the profile's required modules are present.
+  $missing_modules = array_diff($info['dependencies'], $present_modules);
+
+  $requirements = array();
+
+  if (count($missing_modules)) {
+    $modules = array();
+    foreach ($missing_modules as $module) {
+      $modules[] = '<span class="admin-missing">' . drupal_ucfirst($module) . '</span>';
+    }
+    $requirements['required_modules'] = array(
+      'title'       => st('Required modules'),
+      'value'       => st('Required modules not found.'),
+      'severity'    => REQUIREMENT_ERROR,
+      'description' => st('The following modules are required but were not found. Move them into the appropriate modules subdirectory, such as <em>sites/all/modules</em>. Missing modules: !modules', array('!modules' => implode(', ', $modules))),
+    );
+  }
+  return $requirements;
+}
+
+/**
+ * Callback to install the system module.
+ *
+ * Separated from the installation of other modules so core system
+ * functions can be made available while other modules are installed.
+ */
+function drupal_install_system() {
+  $system_path = drupal_get_path('module', 'system');
+  require_once DRUPAL_ROOT . '/' . $system_path . '/system.install';
+  module_invoke('system', 'install');
+
+  $system_versions = drupal_get_schema_versions('system');
+  $system_version = $system_versions ? max($system_versions) : SCHEMA_INSTALLED;
+  db_insert('system')
+    ->fields(array('filename', 'name', 'type', 'owner', 'status', 'schema_version', 'bootstrap'))
+    ->values(array(
+        'filename' => $system_path . '/system.module',
+        'name' => 'system',
+        'type' => 'module',
+        'owner' => '',
+        'status' => 1,
+        'schema_version' => $system_version,
+        'bootstrap' => 0,
+      ))
+    ->execute();
+  system_rebuild_module_data();
+}
+
+/**
+ * Uninstalls a given list of modules.
+ *
+ * @param $module_list
+ *   The modules to uninstall.
+ * @param $uninstall_dependents
+ *   If TRUE, the function will check that all modules which depend on the
+ *   passed-in module list either are already uninstalled or contained in the
+ *   list, and it will ensure that the modules are uninstalled in the correct
+ *   order. This incurs a significant performance cost, so use FALSE if you
+ *   know $module_list is already complete and in the correct order.
+ *
+ * @return
+ *   FALSE if one or more dependent modules are missing from the list, TRUE
+ *   otherwise.
+ */
+function drupal_uninstall_modules($module_list = array(), $uninstall_dependents = TRUE) {
+  if ($uninstall_dependents) {
+    // Get all module data so we can find dependents and sort.
+    $module_data = system_rebuild_module_data();
+    // Create an associative array with weights as values.
+    $module_list = array_flip(array_values($module_list));
+
+    $profile = drupal_get_profile();
+    while (list($module) = each($module_list)) {
+      if (!isset($module_data[$module]) || drupal_get_installed_schema_version($module) == SCHEMA_UNINSTALLED) {
+        // This module doesn't exist or is already uninstalled, skip it.
+        unset($module_list[$module]);
+        continue;
+      }
+      $module_list[$module] = $module_data[$module]->sort;
+
+      // If the module has any dependents which are not already uninstalled and
+      // not included in the passed-in list, abort. It is not safe to uninstall
+      // them automatically because uninstalling a module is a destructive
+      // operation.
+      foreach (array_keys($module_data[$module]->required_by) as $dependent) {
+        if (!isset($module_list[$dependent]) && drupal_get_installed_schema_version($dependent) != SCHEMA_UNINSTALLED && $dependent != $profile) {
+          return FALSE;
+        }
+      }
+    }
+
+    // Sort the module list by pre-calculated weights.
+    asort($module_list);
+    $module_list = array_keys($module_list);
+  }
+
+  foreach ($module_list as $module) {
+    // Uninstall the module.
+    module_load_install($module);
+    module_invoke($module, 'uninstall');
+    drupal_uninstall_schema($module);
+
+    watchdog('system', '%module module uninstalled.', array('%module' => $module), WATCHDOG_INFO);
+    drupal_set_installed_schema_version($module, SCHEMA_UNINSTALLED);
+  }
+
+  if (!empty($module_list)) {
+    // Call hook_module_uninstall to let other modules act
+    module_invoke_all('modules_uninstalled', $module_list);
+  }
+
+  return TRUE;
+}
+
+/**
+ * Verify the state of the specified file.
+ *
+ * @param $file
+ *   The file to check for.
+ * @param $mask
+ *   An optional bitmask created from various FILE_* constants.
+ * @param $type
+ *   The type of file. Can be file (default), dir, or link.
+ * @return
+ *   TRUE on success or FALSE on failure. A message is set for the latter.
+ */
+function drupal_verify_install_file($file, $mask = NULL, $type = 'file') {
+  $return = TRUE;
+  // Check for files that shouldn't be there.
+  if (isset($mask) && ($mask & FILE_NOT_EXIST) && file_exists($file)) {
+    return FALSE;
+  }
+  // Verify that the file is the type of file it is supposed to be.
+  if (isset($type) && file_exists($file)) {
+    $check = 'is_' . $type;
+    if (!function_exists($check) || !$check($file)) {
+      $return = FALSE;
+    }
+  }
+
+  // Verify file permissions.
+  if (isset($mask)) {
+    $masks = array(FILE_EXIST, FILE_READABLE, FILE_WRITABLE, FILE_EXECUTABLE, FILE_NOT_READABLE, FILE_NOT_WRITABLE, FILE_NOT_EXECUTABLE);
+    foreach ($masks as $current_mask) {
+      if ($mask & $current_mask) {
+        switch ($current_mask) {
+          case FILE_EXIST:
+            if (!file_exists($file)) {
+              if ($type == 'dir') {
+                drupal_install_mkdir($file, $mask);
+              }
+              if (!file_exists($file)) {
+                $return = FALSE;
+              }
+            }
+            break;
+          case FILE_READABLE:
+            if (!is_readable($file) && !drupal_install_fix_file($file, $mask)) {
+              $return = FALSE;
+            }
+            break;
+          case FILE_WRITABLE:
+            if (!is_writable($file) && !drupal_install_fix_file($file, $mask)) {
+              $return = FALSE;
+            }
+            break;
+          case FILE_EXECUTABLE:
+            if (!is_executable($file) && !drupal_install_fix_file($file, $mask)) {
+              $return = FALSE;
+            }
+            break;
+          case FILE_NOT_READABLE:
+            if (is_readable($file) && !drupal_install_fix_file($file, $mask)) {
+              $return = FALSE;
+            }
+            break;
+          case FILE_NOT_WRITABLE:
+            if (is_writable($file) && !drupal_install_fix_file($file, $mask)) {
+              $return = FALSE;
+            }
+            break;
+          case FILE_NOT_EXECUTABLE:
+            if (is_executable($file) && !drupal_install_fix_file($file, $mask)) {
+              $return = FALSE;
+            }
+            break;
+        }
+      }
+    }
+  }
+  return $return;
+}
+
+/**
+ * Create a directory with specified permissions.
+ *
+ * @param $file
+ *  The name of the directory to create;
+ * @param $mask
+ *  The permissions of the directory to create.
+ * @param $message
+ *  (optional) Whether to output messages. Defaults to TRUE.
+ * @return
+ *  TRUE/FALSE whether or not the directory was successfully created.
+ */
+function drupal_install_mkdir($file, $mask, $message = TRUE) {
+  $mod = 0;
+  $masks = array(FILE_READABLE, FILE_WRITABLE, FILE_EXECUTABLE, FILE_NOT_READABLE, FILE_NOT_WRITABLE, FILE_NOT_EXECUTABLE);
+  foreach ($masks as $m) {
+    if ($mask & $m) {
+      switch ($m) {
+        case FILE_READABLE:
+          $mod |= 0444;
+          break;
+        case FILE_WRITABLE:
+          $mod |= 0222;
+          break;
+        case FILE_EXECUTABLE:
+          $mod |= 0111;
+          break;
+      }
+    }
+  }
+
+  if (@drupal_mkdir($file, $mod)) {
+    return TRUE;
+  }
+  else {
+    return FALSE;
+  }
+}
+
+/**
+ * Attempt to fix file permissions.
+ *
+ * The general approach here is that, because we do not know the security
+ * setup of the webserver, we apply our permission changes to all three
+ * digits of the file permission (i.e. user, group and all).
+ *
+ * To ensure that the values behave as expected (and numbers don't carry
+ * from one digit to the next) we do the calculation on the octal value
+ * using bitwise operations. This lets us remove, for example, 0222 from
+ * 0700 and get the correct value of 0500.
+ *
+ * @param $file
+ *  The name of the file with permissions to fix.
+ * @param $mask
+ *  The desired permissions for the file.
+ * @param $message
+ *  (optional) Whether to output messages. Defaults to TRUE.
+ * @return
+ *  TRUE/FALSE whether or not we were able to fix the file's permissions.
+ */
+function drupal_install_fix_file($file, $mask, $message = TRUE) {
+  // If $file does not exist, fileperms() issues a PHP warning.
+  if (!file_exists($file)) {
+    return FALSE;
+  }
+
+  $mod = fileperms($file) & 0777;
+  $masks = array(FILE_READABLE, FILE_WRITABLE, FILE_EXECUTABLE, FILE_NOT_READABLE, FILE_NOT_WRITABLE, FILE_NOT_EXECUTABLE);
+
+  // FILE_READABLE, FILE_WRITABLE, and FILE_EXECUTABLE permission strings
+  // can theoretically be 0400, 0200, and 0100 respectively, but to be safe
+  // we set all three access types in case the administrator intends to
+  // change the owner of settings.php after installation.
+  foreach ($masks as $m) {
+    if ($mask & $m) {
+      switch ($m) {
+        case FILE_READABLE:
+          if (!is_readable($file)) {
+            $mod |= 0444;
+          }
+          break;
+        case FILE_WRITABLE:
+          if (!is_writable($file)) {
+            $mod |= 0222;
+          }
+          break;
+        case FILE_EXECUTABLE:
+          if (!is_executable($file)) {
+            $mod |= 0111;
+          }
+          break;
+        case FILE_NOT_READABLE:
+          if (is_readable($file)) {
+            $mod &= ~0444;
+          }
+          break;
+        case FILE_NOT_WRITABLE:
+          if (is_writable($file)) {
+            $mod &= ~0222;
+          }
+          break;
+        case FILE_NOT_EXECUTABLE:
+          if (is_executable($file)) {
+            $mod &= ~0111;
+          }
+          break;
+      }
+    }
+  }
+
+  // chmod() will work if the web server is running as owner of the file.
+  // If PHP safe_mode is enabled the currently executing script must also
+  // have the same owner.
+  if (@chmod($file, $mod)) {
+    return TRUE;
+  }
+  else {
+    return FALSE;
+  }
+}
+
+/**
+ * Send the user to a different installer page.
+ *
+ * This issues an on-site HTTP redirect. Messages (and errors) are erased.
+ *
+ * @param $path
+ *   An installer path.
+ */
+function install_goto($path) {
+  global $base_url;
+  include_once DRUPAL_ROOT . '/includes/common.inc';
+  header('Location: ' . $base_url . '/' . $path);
+  header('Cache-Control: no-cache'); // Not a permanent redirect.
+  drupal_exit();
+}
+
+/**
+ * Returns the URL of the current script, with modified query parameters.
+ *
+ * This function can be called by low-level scripts (such as install.php and
+ * update.php) and returns the URL of the current script. Existing query
+ * parameters are preserved by default, but new ones can optionally be merged
+ * in.
+ *
+ * This function is used when the script must maintain certain query parameters
+ * over multiple page requests in order to work correctly. In such cases (for
+ * example, update.php, which requires the 'continue=1' parameter to remain in
+ * the URL throughout the update process if there are any requirement warnings
+ * that need to be bypassed), using this function to generate the URL for links
+ * to the next steps of the script ensures that the links will work correctly.
+ *
+ * @param $query
+ *   (optional) An array of query parameters to merge in to the existing ones.
+ *
+ * @return
+ *   The URL of the current script, with query parameters modified by the
+ *   passed-in $query. The URL is not sanitized, so it still needs to be run
+ *   through check_url() if it will be used as an HTML attribute value.
+ *
+ * @see drupal_requirements_url()
+ */
+function drupal_current_script_url($query = array()) {
+  $uri = $_SERVER['SCRIPT_NAME'];
+  $query = array_merge(drupal_get_query_parameters(), $query);
+  if (!empty($query)) {
+    $uri .= '?' . drupal_http_build_query($query);
+  }
+  return $uri;
+}
+
+/**
+ * Returns a URL for proceeding to the next page after a requirements problem.
+ *
+ * This function can be called by low-level scripts (such as install.php and
+ * update.php) and returns a URL that can be used to attempt to proceed to the
+ * next step of the script.
+ *
+ * @param $severity
+ *   The severity of the requirements problem, as returned by
+ *   drupal_requirements_severity().
+ *
+ * @return
+ *   A URL for attempting to proceed to the next step of the script. The URL is
+ *   not sanitized, so it still needs to be run through check_url() if it will
+ *   be used as an HTML attribute value.
+ *
+ * @see drupal_current_script_url()
+ */
+function drupal_requirements_url($severity) {
+  $query = array();
+  // If there are no errors, only warnings, append 'continue=1' to the URL so
+  // the user can bypass this screen on the next page load.
+  if ($severity == REQUIREMENT_WARNING) {
+    $query['continue'] = 1;
+  }
+  return drupal_current_script_url($query);
+}
+
+/**
+ * Functional equivalent of t(), used when some systems are not available.
+ *
+ * Used during the install process, when database, theme, and localization
+ * system is possibly not yet available.
+ *
+ * Use t() if your code will never run during the Drupal installation phase.
+ * Use st() if your code will only run during installation and never any other
+ * time. Use get_t() if your code could run in either circumstance.
+ *
+ * @see t()
+ * @see get_t()
+ * @ingroup sanitization
+ */
+function st($string, array $args = array(), array $options = array()) {
+  static $locale_strings = NULL;
+  global $install_state;
+
+  if (empty($options['context'])) {
+    $options['context'] = '';
+  }
+
+  if (!isset($locale_strings)) {
+    $locale_strings = array();
+    if (isset($install_state['parameters']['profile']) && isset($install_state['parameters']['locale'])) {
+      // If the given locale was selected, there should be at least one .po file
+      // with its name ending in install.{$install_state['parameters']['locale']}.po
+      // This might or might not be the entire filename. It is also possible
+      // that multiple files end with the same extension, even if unlikely.
+      $locale_files = install_find_locale_files($install_state['parameters']['locale']);
+      if (!empty($locale_files)) {
+        require_once DRUPAL_ROOT . '/includes/gettext.inc';
+        foreach ($locale_files as $locale_file) {
+          _locale_import_read_po('mem-store', $locale_file);
+        }
+        $locale_strings = _locale_import_one_string('mem-report');
+      }
+    }
+  }
+
+  require_once DRUPAL_ROOT . '/includes/theme.inc';
+  // Transform arguments before inserting them
+  foreach ($args as $key => $value) {
+    switch ($key[0]) {
+      // Escaped only
+      case '@':
+        $args[$key] = check_plain($value);
+        break;
+      // Escaped and placeholder
+      case '%':
+      default:
+        $args[$key] = '<em>' . check_plain($value) . '</em>';
+        break;
+      // Pass-through
+      case '!':
+    }
+  }
+  return strtr((!empty($locale_strings[$options['context']][$string]) ? $locale_strings[$options['context']][$string] : $string), $args);
+}
+
+/**
+ * Check an install profile's requirements.
+ *
+ * @param $profile
+ *   Name of install profile to check.
+ * @return
+ *   Array of the install profile's requirements.
+ */
+function drupal_check_profile($profile) {
+  include_once DRUPAL_ROOT . '/includes/file.inc';
+
+  $profile_file = DRUPAL_ROOT . "/profiles/$profile/$profile.profile";
+
+  if (!isset($profile) || !file_exists($profile_file)) {
+    throw new Exception(install_no_profile_error());
+  }
+
+  $info = install_profile_info($profile);
+
+  // Collect requirement testing results.
+  $requirements = array();
+  foreach ($info['dependencies'] as $module) {
+    module_load_install($module);
+    $function = $module . '_requirements';
+    if (function_exists($function)) {
+      $requirements = array_merge($requirements, $function('install'));
+    }
+  }
+  return $requirements;
+}
+
+/**
+ * Extract highest severity from requirements array.
+ *
+ * @param $requirements
+ *   An array of requirements, in the same format as is returned by
+ *   hook_requirements().
+ * @return
+ *   The highest severity in the array.
+ */
+function drupal_requirements_severity(&$requirements) {
+  $severity = REQUIREMENT_OK;
+  foreach ($requirements as $requirement) {
+    if (isset($requirement['severity'])) {
+      $severity = max($severity, $requirement['severity']);
+    }
+  }
+  return $severity;
+}
+
+/**
+ * Check a module's requirements.
+ *
+ * @param $module
+ *   Machine name of module to check.
+ * @return
+ *   TRUE/FALSE depending on the requirements are in place.
+ */
+function drupal_check_module($module) {
+  module_load_install($module);
+  if (module_hook($module, 'requirements')) {
+    // Check requirements
+    $requirements = module_invoke($module, 'requirements', 'install');
+    if (is_array($requirements) && drupal_requirements_severity($requirements) == REQUIREMENT_ERROR) {
+      // Print any error messages
+      foreach ($requirements as $requirement) {
+        if (isset($requirement['severity']) && $requirement['severity'] == REQUIREMENT_ERROR) {
+          $message = $requirement['description'];
+          if (isset($requirement['value']) && $requirement['value']) {
+            $message .= ' (' . t('Currently using !item !version', array('!item' => $requirement['title'], '!version' => $requirement['value'])) . ')';
+          }
+          drupal_set_message($message, 'error');
+        }
+      }
+      return FALSE;
+    }
+  }
+  return TRUE;
+}
+
+/**
+ * Retrieve info about an install profile from its .info file.
+ *
+ * The information stored in a profile .info file is similar to that stored in
+ * a normal Drupal module .info file. For example:
+ * - name: The real name of the install profile for display purposes.
+ * - description: A brief description of the profile.
+ * - dependencies: An array of shortnames of other modules this install profile requires.
+ *
+ * Additional, less commonly-used information that can appear in a profile.info
+ * file but not in a normal Drupal module .info file includes:
+ * - distribution_name: The name of the Drupal distribution that is being
+ *   installed, to be shown throughout the installation process. Defaults to
+ *   'Drupal'.
+ *
+ * Note that this function does an expensive file system scan to get info file
+ * information for dependencies. If you only need information from the info
+ * file itself, use system_get_info().
+ *
+ * Example of .info file:
+ * @code
+ *    name = Minimal
+ *    description = Start fresh, with only a few modules enabled.
+ *    dependencies[] = block
+ *    dependencies[] = dblog
+ * @endcode
+ *
+ * @param $profile
+ *   Name of profile.
+ * @param $locale
+ *   Name of locale used (if any).
+ *
+ * @return
+ *   The info array.
+ */
+function install_profile_info($profile, $locale = 'en') {
+  $cache = &drupal_static(__FUNCTION__, array());
+
+  if (!isset($cache[$profile])) {
+    // Set defaults for module info.
+    $defaults = array(
+      'dependencies' => array(),
+      'description' => '',
+      'distribution_name' => 'Drupal',
+      'version' => NULL,
+      'hidden' => FALSE,
+      'php' => DRUPAL_MINIMUM_PHP,
+    );
+    $info = drupal_parse_info_file("profiles/$profile/$profile.info") + $defaults;
+    $info['dependencies'] = array_unique(array_merge(
+      drupal_required_modules(),
+      $info['dependencies'],
+      ($locale != 'en' && !empty($locale) ? array('locale') : array()))
+    );
+
+    // drupal_required_modules() includes the current profile as a dependency.
+    // Since a module can't depend on itself we remove that element of the array.
+    array_shift($info['dependencies']);
+
+    $cache[$profile] = $info;
+  }
+  return $cache[$profile];
+}
+
+/**
+ * Ensures the environment for a Drupal database on a predefined connection.
+ *
+ * This will run tasks that check that Drupal can perform all of the functions
+ * on a database, that Drupal needs. Tasks include simple checks like CREATE
+ * TABLE to database specific functions like stored procedures and client
+ * encoding.
+ */
+function db_run_tasks($driver) {
+  db_installer_object($driver)->runTasks();
+  return TRUE;
+}
+
+/**
+ * Returns a database installer object.
+ *
+ * @param $driver
+ *   The name of the driver.
+ */
+function db_installer_object($driver) {
+  Database::loadDriverFile($driver, array('install.inc'));
+  $task_class = 'DatabaseTasks_' . $driver;
+  return new $task_class();
+}