code: def docker_installed_rpms(broker):
          
          ctx = broker[DockerImageContext]
          root = ctx.root
          fmt = DefaultSpecs.rpm_format
          cmd = "/usr/bin/rpm -qa --root %s --qf '%s'" % (root, fmt)
          result = ctx.shell_out(cmd)
          return CommandOutputProvider(cmd, ctx, content=result)
docs: Command: /usr/bin/rpm -qa --root `%s` --qf `%s`