fix pyright lints

zfs_backup.py

@@ -38,8 +38,6 @@ def main():
 class Manager:
     """Controls the overall backup process."""
 
-    _map_type: dict[Dataset, Dataset | None]
-
     def __init__(self, local_pool: Pool, external_pool: ExternalPool):
         self._local_pool = local_pool
         self._external_pool = external_pool
@@ -70,11 +68,11 @@ class Manager:
                     continue
             ZFS.receive(stream, self._external_pool)
 
-    def _get_user_filtered_dataset_backup_map(self) -> _map_type:
+    def _get_user_filtered_dataset_backup_map(self) -> dict[Dataset, Dataset | None]:
         """Get the dataset map, let user confirm new datasets."""
         return self._user_confirm_new_datasets(self._get_raw_dataset_map())
 
-    def _user_confirm_new_datasets(self, dataset_map: _map_type) -> _map_type:
+    def _user_confirm_new_datasets(self, dataset_map: dict[Dataset, Dataset | None]) -> dict[Dataset, Dataset | None]:
         """For datasets that exist only locally, ask the user if he wants to back it up.
 
         If he doesn't, remove it from the dict.
@@ -85,7 +83,7 @@ class Manager:
             if remote_dataset is not None or self._ask_user_confirmation(local_dataset)
         }
 
-    def _get_raw_dataset_map(self) -> _map_type:
+    def _get_raw_dataset_map(self) -> dict[Dataset, Dataset | None]:
         """Return map from local to remote datasets.
 
         If the local dataset has no remote match, set the remote dataset to None.
@@ -171,7 +169,7 @@ class Manager:
         return common_snapshots[-1]
 
     @staticmethod
-    def _ask_user_confirmation(dataset: Dataset) -> bool:
+    def _ask_user_confirmation(dataset: Dataset) -> bool:  # type: ignore (false positive)
         msg = f"Dataset {dataset.qualified_name} does not exist in backup pool. Backup? [y/n] "
         reply = ""
         while not reply:
@@ -256,6 +254,7 @@ class ZFSPath:
         """Return the `zfs` path, but without the pool name."""
         name = "/".join(self._elements[1:])
         if self.is_snapshot:
+            assert self.snapshot_name
             name = "@".join([name, self.snapshot_name])
         return name
 
@@ -751,8 +750,8 @@ class Snapshot:
     def from_string(cls, qualified_name: str) -> Snapshot:
         return cls(ZFSPath.from_string(qualified_name))
 
-    def __lt__(self, other: Snapshot) -> bool:
-        return self.snapshot_name < other.snapshot_name
+    def __gt__(self, other: Snapshot) -> bool:
+        return self.snapshot_name > other.snapshot_name
 
     def __repr__(self):
         return str(self._path)
@@ -765,6 +764,7 @@ class Snapshot:
 
     @property
     def snapshot_name(self) -> str:
+        assert self._path.snapshot_name
         return self._path.snapshot_name
 
     def matches_regex(self, regex: str) -> bool: