docs: def build_from_source(version, **kwargs):
          """
          Builds specified Spark version from source.
          :param version:
          :param kwargs:
          :return: (Integer) Status code of build/mvn command.
          """
          mvn = os.path.join(Spark.svm_version_path(version), 'build', 'mvn')
          Spark.chmod_add_excute(mvn)
          p = subprocess.Popen([mvn, '-DskipTests', 'clean', 'package'], cwd=Spark.svm_version_path(version))
          p.wait()
          return p.returncode