[issue-190] Ensure the directory is writable before copying default.s…

…ettings.php to settings.php (#191)

Co-authored-by: Nigel Banks <nigel.g.banks@gmail.com:w>

drupal/rootfs/usr/share/drush/Commands/UpdateSettingsCommands.php

@@ -34,7 +34,13 @@ public function createSettingsIfMissing()
     $settings_file = $this->getSettingFilePath();
     $fs = new Filesystem();
     if (!$fs->exists($settings_file)) {
+      // After drush site-install has been run it is possible for the default
+      // directory to be non-writable by anyone.
+      $site_directory = dirname($settings_file);
+      $prev = fileperms($site_directory);
+      $fs->chmod($site_directory, 0775);
       $fs->copy(DRUPAL_ROOT . '/sites/default/default.settings.php', $settings_file);
+      $fs->chmod($site_directory, $prev);
     }
   }