code: def test_syncer_wait_or_retry_eventual_success(
      temp_data_dirs, tmp_path
  ):
      """Check that the wait or retry API succeeds for a sync_down that
      fails, times out, then succeeds."""
      tmp_source, tmp_target = temp_data_dirs
  
      success = tmp_path / "success"
      fail_marker = tmp_path / "fail_marker"
      hang_marker = tmp_path / "hang_marker"
  
      def eventual_upload(*args, **kwargs):
          if not fail_marker.exists():
              fail_marker.write_text(".", encoding="utf-8")
              raise RuntimeError("Failing")
          elif not hang_marker.exists():
              hang_marker.write_text(".", encoding="utf-8")
              time.sleep(5)
          else:
              success.write_text(".", encoding="utf-8")
  
      class EventualSuccessSyncer(_FilesystemSyncer):
          def _sync_up_command(
              self,
              local_path: str,
              uri: str,
              exclude: Optional[List] = None,
          ):
              return (
                  eventual_upload,
                  dict(local_path=local_path, uri=uri, exclude=exclude),
              )
  
      syncer = EventualSuccessSyncer(
          storage_filesystem=_create_mock_custom_fs(tmp_path),
          sync_period=60,
          sync_timeout=0.5,
      )
  
      syncer.sync_up(
          local_dir=tmp_source, remote_dir="/test/eventual_success"
      )
      # The syncer will retry 2 times, running 3 times in total and eventually succeeding.
      syncer.wait_or_retry(max_retries=2, backoff_s=0)
      assert success.exists()
  
imports: import logging
  import os
  import time
  from typing import List, Optional
  from freezegun import freeze_time
  import pytest
  import ray
  import ray.cloudpickle
  from ray.train._internal.storage import _upload_to_fs_path, _download_from_fs_path, get_fs_and_path, _FilesystemSyncer
  from ray.train._internal.syncer import _BackgroundProcess
  from ray.train.tests.test_new_persistence import _create_mock_custom_fs
label_desc: Use image node_id 17 for calling a global function with example usage: test_syncer_wait_or_retry_eventual_success(temp_data_dirs, tmp_path) and returns: eventual_upload,  dict