Merge pull request #63 from Crec0/hackfix-issue-62

Attempted fix at #62

Author: Venom1991

src/refind_btrfs/service/snapshot_event_handler.py

@@ -73,6 +73,7 @@ def __init__(
         self._machine = machine
         self._deleted_snapshots: Set[Subvolume] = set()
         self._deletion_lock = Lock()
+        self._event_lock = Lock()
 
     def on_created(self, event: FileSystemEvent) -> None:
         is_dir_created_event = (
@@ -89,7 +90,8 @@ def on_created(self, event: FileSystemEvent) -> None:
 
                 logger.info(f"The '{created_directory}' snapshot has been created.")
 
-                machine.run()
+                with self._event_lock:
+                    machine.run()
 
     def on_deleted(self, event: FileSystemEvent) -> None:
         is_dir_deleted_event = (
@@ -107,7 +109,9 @@ def on_deleted(self, event: FileSystemEvent) -> None:
 
                     logger.info(f"The '{deleted_directory}' snapshot has been deleted.")
 
-                    machine.run()
+                    with self._event_lock:
+                        machine.run()
+
             except SnapshotExcludedFromDeletionError as e:
                 logger.warning(e.formatted_message)