code: def get_git_commit_sha():
      """Get git commit SHA for this build.
  
      Attempt to get the SHA from environment variable GIT_COMMIT, which should
      be available on Jenkins build agents.
  
      Returns:
        SHA hash of the git commit used for the build, if available
      """
  
      return os.getenv("GIT_COMMIT")
  
file_path: tensorflow/tensorflow/tools/test/run_and_gather_logs_lib.py
imports: import os
  import re
  import shlex
  import subprocess
  import tempfile
  import time
  from tensorflow.core.util import test_log_pb2
  from tensorflow.python.platform import gfile
  from tensorflow.tools.test import gpu_info_lib
  from tensorflow.tools.test import system_info_lib
label_desc: Use image node_id 1 for calling a global function with example usage: get_git_commit_sha() and returns: os