docs: def getBuild(self, build_id, **kwargs):
          """
          Load all information about a build and return a custom Build class.
  
          Calls "getBuild" XML-RPC.
  
          :param build_id: ``int``, for example 12345
          :returns: deferred that when fired returns a Build (Munch, dict-like)
                    object representing this Koji build, or None if no build was
                    found.
          """
          buildinfo = yield self.call('getBuild', build_id, **kwargs)
          build = Build.fromDict(buildinfo)
          if build:
              build.connection = self
          defer.returnValue(build)