prow/pod-utils/gcs/target.go
func NewSingleDefaultRepoPathBuilder(defaultOrg, defaultRepo string) RepoPathBuilder {
	return func(org, repo string) string {
		if org == defaultOrg && repo == defaultRepo {
			return ""
		}
		// handle gerrit repo
		repo = strings.Replace(repo, "/", "_", -1)
		return fmt.Sprintf("%s_%s", org, repo)
	}
}
func NewSingleDefaultRepoPathBuilder(defaultOrg, defaultRepo string) RepoPathBuilder {
	return func(org, repo string) string {
		if org == defaultOrg && repo == defaultRepo {
			return ""
		}
		// handle gerrit repo
		repo = strings.Replace(repo, "/", "_", -1)
		return fmt.Sprintf("%s_%s", org, repo)
	}
}
// NewSingleDefaultRepoPathBuilder returns a builder that handles the legacy path
// encoding where a path will contain org and repo for all but one default repo