docs: def dump_database(self):
          """ Create dumpfile from postgres database, and return filename. """
          db_file = self.create_file_name(self.databases['source']['name'])
          self.print_message("Dumping postgres database '%s' to file '%s'"
                             % (self.databases['source']['name'], db_file))
          self.export_pgpassword('source')
          args = [
              "pg_dump",
              "-Fc",
              "--no-acl",
              "--no-owner",
              "--dbname=%s" % self.databases['source']['name'],
              "--file=%s" % db_file,
          ]
          args.extend(self.databases['source']['args'])
          subprocess.check_call(args)
          return db_file