imageRef, err := m.imageService.PullImage(ctx, imgSpec, auth, podSandboxConfig)
		// If there was no error, return success
		if err == nil {
			return imageRef, nil
		}

		pullErrs = append(pullErrs, err)
	}

	return "", utilerrors.NewAggregate(pullErrs)
}

// GetImageRef gets the ID of the image which has already been in
// the local storage. It returns ("", nil) if the image isn't in the local storage.