Add symlink force for unittest test_static_save_load (#29137)

* add symlink force for unittest

* open unittest

python/paddle/fluid/tests/unittests/CMakeLists.txt

@@ -348,7 +348,6 @@ list(REMOVE_ITEM TEST_OPS test_imperative_static_runner_while)
 # disable this unittest temporarily
 list(REMOVE_ITEM TEST_OPS test_imperative_data_loader_exception)
 list(REMOVE_ITEM TEST_OPS test_sampling_id_op)
-list(REMOVE_ITEM TEST_OPS test_static_save_load)
 
 if (APPLE OR WIN32)
   list(REMOVE_ITEM TEST_OPS test_dataset)
@@ -669,7 +668,7 @@ set_tests_properties(test_nearest_interp_v2_op PROPERTIES TIMEOUT 120)
 set_tests_properties(test_trilinear_interp_op PROPERTIES TIMEOUT 120)
 set_tests_properties(test_bicubic_interp_v2_op PROPERTIES TIMEOUT 120)
 set_tests_properties(test_gather_op PROPERTIES TIMEOUT 120)
-#set_tests_properties(test_static_save_load PROPERTIES TIMEOUT 120)
+set_tests_properties(test_static_save_load PROPERTIES TIMEOUT 120)
 set_tests_properties(test_imperative_selected_rows_to_lod_tensor PROPERTIES TIMEOUT 120)
 set_tests_properties(test_index_select_op PROPERTIES TIMEOUT 120)
 set_tests_properties(test_parallel_ssa_graph_inference_feed_partial_data PROPERTIES TIMEOUT 120)

python/paddle/fluid/tests/unittests/test_static_save_load.py

@@ -28,6 +28,7 @@ import numpy as np
 import six
 import pickle
 import os
+import errno
 
 
 class SimpleLSTMRNN(fluid.Layer):
@@ -1159,11 +1160,20 @@ class TestProgramStateOldSave(unittest.TestCase):
             self.check_in_static(main_program, base_map)
 
             # case 2: load with no need file
+            def symlink_force(target, link_name):
+                try:
+                    os.symlink(target, link_name)
+                except OSError as e:
+                    if e.errno == errno.EEXIST:
+                        os.remove(link_name)
+                        os.symlink(target, link_name)
+                    else:
+                        raise e
+
             orig_filepath = './test_program_1/fc_0.w_0'
             symlink_filepath = './test_program_1/link_fc_0.w_0'
-            if os.path.exists(symlink_filepath):
-                os.remove(symlink_filepath)
-            os.symlink(orig_filepath, symlink_filepath)
+            # create a needless link file for coverage
+            symlink_force(orig_filepath, symlink_filepath)
             program_state = fluid.load_program_state("test_program_1")
             fluid.set_program_state(main_program, program_state)
             self.check_in_static(main_program, base_map)