code: def _get_prepare_env(self, script, job_descriptor, inputs, outputs, mounts):
      
  
      # Add the _SCRIPT_REPR with the repr(script) contents
      # Add the _META_YAML_REPR with the repr(meta) contents
  
      # Add variables for directories that need to be created, for example:
      # DIR_COUNT: 2
      # DIR_0: /mnt/data/input/gs/bucket/path1/
      # DIR_1: /mnt/data/output/gs/bucket/path2
  
      # List the directories in sorted order so that they are created in that
      # order. This is primarily to ensure that permissions are set as we create
      # each directory.
      # For example:
      #   mkdir -m 777 -p /root/first/second
      #   mkdir -m 777 -p /root/first
      # *may* not actually set 777 on /root/first
  
      docker_paths = sorted([
          var.docker_path if var.recursive else os.path.dirname(var.docker_path)
          for var in inputs | outputs | mounts
          if var.value
      ])
  
      env = {
          _SCRIPT_VARNAME: repr(script.value),
          _META_YAML_VARNAME: repr(job_descriptor.to_yaml()),
          'DIR_COUNT': str(len(docker_paths))
      }
  
      for idx, path in enumerate(docker_paths):
        env['DIR_{}'.format(idx)] = os.path.join(providers_util.DATA_MOUNT_POINT,
                                                 path)
  
      return env
docs: Return a dict with variables for the 'prepare' action.