prow/pod-utils/gcs/upload.go
func FileUploadWithMetadata(file string, metadata map[string]string) UploadFunc {
	return func(obj *storage.ObjectHandle) error {
		reader, err := os.Open(file)
		if err != nil {
			return err
		}

		uploadErr := DataUploadWithMetadata(reader, metadata)(obj)
		closeErr := reader.Close()

		return errorutil.NewAggregate(uploadErr, closeErr)
	}
}
func FileUploadWithMetadata(file string, metadata map[string]string) UploadFunc {
	return func(obj *storage.ObjectHandle) error {
		reader, err := os.Open(file)
		if err != nil {
			return err
		}

		uploadErr := DataUploadWithMetadata(reader, metadata)(obj)
		closeErr := reader.Close()

		return errorutil.NewAggregate(uploadErr, closeErr)
	}
}
// FileUploadWithMetadata returns an UploadFunc which copies all
// data from the file on disk into GCS object and also sets the provided
// metadata fields on the object.