Handle PermissionError in os.chmod Call - Update engine.py

deepspeed/runtime/engine.py

@@ -3299,8 +3299,15 @@ def _copy_recovery_script(self, save_path):
         dst = os.path.join(save_path, script)
         #logger.info(f"creating recovery script {dst}")
         copyfile(src, dst)
-        # make executable
-        os.chmod(dst, os.stat(dst).st_mode | stat.S_IEXEC)
+        self._change_recovery_script_permissions(dst)
+
+    def _change_recovery_script_permissions(self, dst):
+        # make executable (safeguard for file shares - Azure as example)
+        try:
+            os.chmod(dst, os.stat(dst).st_mode | stat.S_IEXEC)
+        except Exception as e:
+            #this message is used in unit test TestZeRONonDistributed
+            logger.info(f'Warning: Could not change permissions for {dst} due to error: {e}. Continuing without changing permissions.')
 
     def _save_zero_checkpoint(self, save_path, tag):
         zero_checkpoint_name = self._get_zero_ckpt_name(save_path, tag)

tests/unit/checkpoint/test_zero_optimizer.py

@@ -4,6 +4,7 @@
 # DeepSpeed Team
 
 import deepspeed
+from types import SimpleNamespace
 from deepspeed.ops.op_builder import CPUAdamBuilder
 from deepspeed.checkpoint.utils import clone_tensors_for_torch_save, get_model_ckpt_name_for_rank
 from deepspeed.accelerator import get_accelerator
@@ -576,3 +577,33 @@ def test_save_tensor_clone(self, tmpdir, zero_stage, use_cpu_device):
         torch.save(clone_state_dict, clone_ckpt_file)
 
         compare_state_dicts(torch.load(ref_ckpt_file), torch.load(clone_ckpt_file))
+
+
+class TestZeRONonDistributed(DistributedTest):
+    world_size = 1
+    init_distributed = False
+
+    def test_chmod_exception_handling(self, monkeypatch):
+
+        config_dict = {"train_batch_size": 1, "zero_optimization": {"stage": 0}}
+        args = SimpleNamespace(local_rank=0)
+        net = SimpleModel(hidden_dim=4)
+        engine, _, _, _ = deepspeed.initialize(args=args,
+                                               config=config_dict,
+                                               model=net,
+                                               model_parameters=net.parameters())
+
+        log_called = False
+        def mock_logger_info(message, *args, **kwargs):
+            nonlocal log_called
+            log_called = True
+
+        monkeypatch.setattr("deepspeed.utils.logger.info", mock_logger_info)
+        """
+            This is presented for use-cases like Azure Storage File Share (where permissions are not allowed)
+            We use a fake file for this test (file not existing would present a simliar issue as not being able to chmod)
+        """
+        fake_recovery_script_dst = os.path.join("tmp", "zero_to_fp32.py")
+        engine._change_recovery_script_permissions(fake_recovery_script_dst)
+
+        assert log_called, "Expected deepspeed.utils.logger.info to be called."