code: func GetRebuildImage(docker Docker, config *api.Config) (*PullResult, error) {
  	return pullAndCheck(config.Tag, docker, config.BuilderPullPolicy, config)
  }
docs: // GetRebuildImage obtains the metadata information for the image specified in
  // a s2i rebuild operation. Assumptions are made that the build is available
  // locally since it should have been previously built.