docs: def freeze(self, tmp_dir):
          """Copies a secret into a particular location"""
          for sfile in self.secrets():
              src_file = hard_path(sfile, self.opt.secrets)
              if not os.path.exists(src_file):
                  raise aomi_excep.IceFile("%s secret not found at %s" %
                                           (self, src_file))
  
              dest_file = "%s/%s" % (tmp_dir, sfile)
              dest_dir = os.path.dirname(dest_file)
              if not os.path.isdir(dest_dir):
                  os.mkdir(dest_dir, 0o700)
  
              shutil.copy(src_file, dest_file)
              LOG.debug("Froze %s %s", self, sfile)