@classmethod<EOL><INDENT>def get_instance_from_build_spec(cls, name, disk_path, build_spec, paths):<DEDENT>
instance = cls(name, disk_path, paths)<EOL>instance.normalize_build_spec(build_spec)<EOL>return instance<EOL>
Args:
    name (str): The name of the vm this builder belongs
    disk_path (str): The path to the disk that needs to be customized
    paths (lago.paths.Paths): The paths of the current prefix
    build_spec (dict): The build spec part, associated with the
        disk located at disk_path, from the init file.

Returns:
    An instance of Build with a normalized build spec i.e ready to
        be invoked.