Improve logging. Fix cleanup in dev mode

docker_squash/image.py

@@ -186,11 +186,12 @@ def _before_squashing(self):
         try:
             number_of_layers = int(self.from_layer)
 
-            self.log.debug("We detected number of layers as the argument to squash")
+            self.log.debug(
+                f"We detected number of layers ({number_of_layers}) as the argument to squash"
+            )
         except ValueError:
-            self.log.debug("We detected layer as the argument to squash")
-
             squash_id = self._squash_id(self.from_layer)
+            self.log.debug(f"We detected layer ({squash_id}) as the argument to squash")
 
             if not squash_id:
                 raise SquashError(

docker_squash/squash.py

@@ -143,8 +143,11 @@ def squash(self, image: Image):
             # Load squashed image into Docker
             image.load_squashed_image()
 
-        # Clean up all temporary files
-        image.cleanup()
+        # If development mode is not enabled, make sure we clean up the
+        # temporary directory
+        if not self.development:
+            # Clean up all temporary files
+            image.cleanup()
 
         # Remove the source image - this is the only possible way
         # to remove orphaned layers from Docker daemon at the build time.