Fix typing and linting errors

Fix typing error in checksum path factory
Fix immediate reraise in manip resource handler
Fix unsilenced warning in manip protocol function

kodak/database/_shared.py

@@ -47,7 +47,7 @@ class Checksum(NamedTuple):
 
         hasher = constructor()
         view = memoryview(bytearray(1024 * 1024))
-        with path.open("rb", buffering=0) as infile:
+        with Path(path).open("rb", buffering=0) as infile:
             for chunk in iter(lambda: infile.readinto(view), 0):  # type: ignore
                 hasher.update(view[:chunk])
 

kodak/manipulations.py

@@ -98,7 +98,8 @@ def crop(image: Image.Image, config: configuration.ManipConfig) -> Image.Image:
 
 
 def black_and_white(
-    image: Image.Image, config: configuration.ManipConfig
+    image: Image.Image,
+    config: configuration.ManipConfig,  # pylint: disable=unused-argument
 ) -> Image.Image:
     """Convert an image to full-depth black and white"""
     logger = logging.getLogger(__name__)

kodak/resources/manip.py

@@ -24,7 +24,7 @@ class ImageManip(KodakResource):
             manip_config = flask.current_app.appconfig.manips[manip_name]
             format_ = constants.ImageFormat[format_name.upper()]
         except KeyError:
-            raise
+            raise RuntimeError("Manip or format doesn't exist") from None
 
         with database.interface.atomic():
             parent = database.ImageRecord.get(database.ImageRecord.name == image_name)