feat: groundd work on legacy snapshots loading

multi_user/operators.py

@@ -1058,7 +1058,31 @@ class SessionLoadSaveOperator(bpy.types.Operator, ImportHelper):
         # init the factory with supported types
         bpy_protocol = bl_types.get_data_translation_protocol()
         repo = Repository(bpy_protocol)
+
+        try:
             repo.loads(self.filepath)
+        except TypeError:
+            # Load legacy snapshots
+            db = pickle.load(gzip.open(self.filepath, "rb"))
+
+            nodes = db.get("nodes")
+
+            logging.info(f"Loading legacy {len(nodes)} node")
+            repo.object_store.clear()
+            for node, node_data in nodes:
+                    instance = Node(
+                        uuid=node,
+                        data=node_data.get('data'),
+                        owner=node_data.get('owner'),
+                        dependencies=node_data.get('dependencies'),
+                        state=FETCHED)
+                    # Patch data for compatibility
+                    type_id = node_data.get('str_type')[2:]
+                    if type_id == "File":
+                        type_id = "WindowsPath"
+                    instance.data['type_id'] = type_id
+                    repo.do_commit(instance)
+                    instance.state = FETCHED
 
         # Persitstent collection 
         ignored_datablocks = []