def on_perms_changed(self, entry, perms_label):
text = entry.get_text()
if len(text) == 3 and Util.is_integer(text):
(model, treepaths) = self._treeview.get_selection().get_selected_rows()
treeiter = model.get_iter(treepaths[0])
os.chmod(model[treeiter][1], int(text, 8))
filestat = Util.get_file_stat(model[treeiter][1])
perms_label.set_label(Util.create_perm_str(filestat.st_mode))
