func BlockPathFromEnv(block *pfs.Block) (string, error) {
	storageRoot, err := StorageRootFromEnv()
	if err != nil {
		return "", err
	}
	return filepath.Join(storageRoot, "block", block.Hash), nil
}
func BlockPathFromEnv(block *pfs.Block) (string, error) {
	storageRoot, err := StorageRootFromEnv()
	if err != nil {
		return "", err
	}
	return filepath.Join(storageRoot, "block", block.Hash), nil
}
// BlockPathFromEnv gets the path to an object storage block based on environment variables.