code: def ensure_env(f):
      """A decorator that ensures an env exists before a function
      calls any GDAL C functions."""
  
      @wraps(f)
      def wrapper(*args, **kwds):
          if local._env:
              return f(*args, **kwds)
          else:
              with Env.from_defaults():
                  return f(*args, **kwds)
  
      return wrapper
  
imports: from functools import wraps, total_ordering
  from inspect import getfullargspec
  import logging
  import os
  import re
  import threading
  import warnings
  import attr
  from rasterio._env import GDALEnv, get_gdal_config, set_gdal_config, GDALDataFinder, PROJDataFinder, set_proj_data_search_path
  from rasterio._version import gdal_version
  from rasterio.errors import EnvError, GDALVersionError, RasterioDeprecationWarning
  from rasterio.session import Session, DummySession
label_desc: Use image node_id 8 for calling a global function with example usage: ensure_env(f) and returns: wrapper, f, f