<?php

function MY_PROFILE_install_tasks($install_state) {
  $tasks['MY_PROFILE_create_private_dir'] = array(
    'type' => 'normal',
    'run' => INSTALL_TASK_RUN_IF_REACHED,
  );

  return $tasks;
}

function MY_PROFILE_create_private_dir() {
  // THIS IS NOT SAFE AND SHOULD BE CHANGED LATER ON MANUALLY FROM ADMIN!
  $private_directory = 'sites/default/files/private';
  // Create the folder.
  drupal_mkdir($private_directory, NULL, TRUE);
  drupal_chmod($private_directory);
  // Private filesystem.
  variable_set('file_private_path', $private_directory);
  file_create_htaccess($private_directory);
}