Support LocalDatastore gets auto-update on CIFS mounts (#1325)

* support watching datastore on mounted file systems

Signed-off-by: Janis Vahldiek <[email protected]>

* change imports

Signed-off-by: Janis Vahldiek <[email protected]>

* fix params

Signed-off-by: Janis Vahldiek <[email protected]>

---------

Signed-off-by: Janis Vahldiek <[email protected]>

Author: jlvahldiek

monailabel/datastore/local.py

@@ -26,6 +26,7 @@
 from pydantic import BaseModel
 from watchdog.events import PatternMatchingEventHandler
 from watchdog.observers import Observer
+from watchdog.observers.polling import PollingObserver
 
 from monailabel.interfaces.datastore import Datastore, DefaultLabelTag
 from monailabel.interfaces.exception import ImageNotFoundException, LabelNotFoundException
@@ -169,7 +170,7 @@ def __init__(
             try:
                 self._ignore_event_count = 0
                 self._ignore_event_config = False
-                self._observer = Observer()
+                self._observer = PollingObserver() if self._is_on_mount(self._datastore.image_path()) else Observer()
                 self._observer.schedule(self._handler, recursive=True, path=self._datastore_path)
                 self._observer.start()
             except OSError as e:
@@ -694,6 +695,14 @@ def _write_to_file():
         else:
             _write_to_file()
 
+    def _is_on_mount(self, path):
+        while True:
+            if path == os.path.dirname(path):
+                return False
+            elif os.path.ismount(path):
+                return True
+            path = os.path.dirname(path)
+
     def status(self) -> Dict[str, Any]:
         tags: dict = {}
         for obj in self._datastore.objects.values():