code: def ensure_env(f):
      """A decorator that ensures an env exists before a function
      calls any GDAL C functions.
  
      Parameters
      ----------
      f : function
          A function.
  
      Returns
      -------
      A function wrapper.
  
      Notes
      -----
      If there is already an existing environment, the wrapper does
      nothing and immediately calls f with the given arguments.
  
      """
  
      @wraps(f)
      def wrapper(*args, **kwargs):
          if local._env:
              return f(*args, **kwargs)
          else:
              with Env.from_defaults():
                  return f(*args, **kwargs)
  
      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 fiona._env import GDALDataFinder, GDALEnv, PROJDataFinder, calc_gdal_version_num, get_gdal_config, get_gdal_release_name, get_gdal_version_num, set_gdal_config, set_proj_data_search_path
  from fiona.errors import EnvError, FionaDeprecationWarning, GDALVersionError
  from fiona.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