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        for name in decode_names:
            attr = getattr(self, name, None)
            if attr:
                # Try to decode strings
                if isinstance(attr, str):
                    try:
                        setattr(self, name, unicode(attr, charset))
                    except UnicodeError:
                        raise error.ConfigurationError(message %
                                                       {'name': name})
                # Look into lists and try to decode strings inside them
                elif isinstance(attr, list):
                    for i in xrange(len(attr)):
                        item = attr[i]
                        if isinstance(item, str):
                            try:
                                attr[i] = unicode(item, charset)
                            except UnicodeError:
                                raise error.ConfigurationError(message %
                                                               {'name': name})

    def _check_directories(self):
        """ Make sure directories are accessible

        Both data and underlay should exists and allow read, write and
        execute.
        """
        mode = os.F_OK | os.R_OK | os.W_OK | os.X_OK
        for attr in ('data_dir', 'data_underlay_dir'):
            path = getattr(self, attr)

            # allow an empty underlay path or None
            if attr == 'data_underlay_dir' and not path:
                continue

            path_pages = os.path.join(path, "pages")
            if not (os.path.isdir(path_pages) and os.access(path_pages, mode)):
                msg = """
%(attr)s "%(path)s" does not exist, or has incorrect ownership or
permissions.

Make sure the directory and the subdirectory "pages" are owned by the web
server and are readable, writable and executable by the web server user
and group.

It is recommended to use absolute paths and not relative paths. Check
also the spelling of the directory name.
""" % {'attr': attr, 'path': path, }
                raise error.ConfigurationError(msg)

    def _loadPluginModule(self):
        """
        import all plugin modules

        To be able to import plugin from arbitrary path, we have to load
        the base package once using imp.load_module. Later, we can use
        standard __import__ call to load plugins in this package.

        Since each configured plugin path has unique plugins, we load the
        plugin packages as "moin_plugin_<sha1(path)>.plugin".
        """
        import imp
        from MoinMoin.support.python_compatibility import hash_new

        plugin_dirs = [self.plugin_dir] + self.plugin_dirs
        self._plugin_modules = []

        try:
            # Lock other threads while we check and import
            imp.acquire_lock()
            try:
                for pdir in plugin_dirs:
                    csum = 'p_%s' % hash_new('sha1', pdir).hexdigest()
                    modname = '%s.%s' % (self.siteid, csum)
                    # If the module is not loaded, try to load it
                    if not modname in sys.modules:
                        # Find module on disk and try to load - slow!
                        abspath = os.path.abspath(pdir)
                        parent_dir, pname = os.path.split(abspath)
                        fp, path, info = imp.find_module(pname, [parent_dir])
                        try:
                            # Load the module and set in sys.modules
                            module = imp.load_module(modname, fp, path, info)
                            setattr(sys.modules[self.siteid], 'csum', module)
                        finally:
                            # Make sure fp is closed properly
                            if fp:
                                fp.close()
                    if modname not in self._plugin_modules:
                        self._plugin_modules.append(modname)
            finally:
                imp.release_lock()
        except ImportError, err:
            msg = """
Could not import plugin package "%(path)s" because of ImportError:
%(err)s.