code: def s3_etag(url):
      """Check ETag on S3 object."""
      import boto3
  
      s3_resource = boto3.resource("s3")
      bucket_name, s3_path = split_s3_path(url)
      s3_object = s3_resource.Object(bucket_name, s3_path)
      return s3_object.e_tag
  
imports: import fnmatch
  import json
  import logging
  import os
  import shutil
  import tarfile
  import tempfile
  from functools import partial, wraps
  from hashlib import sha256
  from io import open
label_desc: Use image node_id 8 for calling a global function with example usage: s3_etag(url) and returns: s3_object