Cleanly delete temporary files.

- Addresses Backproject errors during pipeline due to permissions error. #9
- Now cleans out all memory maps to allow deletion of temporary files.
- Also (silently, for now) leaves temporary files there if they can't be deleted.

May figure out good approach to log that doesn't clog up the progress bar in future.

This should allow the backproject pipeline to successfully write single files and MIPs, though I haven't tested that.

Author: den-sq

python/ouroboros/pipeline/backproject_pipeline.py

@@ -328,17 +328,14 @@ def _process(self, input_data: any) -> tuple[any, None] | tuple[None, any]:
             # Update the progress bar
             self.update_progress(0.5 + i / len(chunks_and_boxes) / 2)
 
-        # Close all the memmaps
-        for volume_memmap in volume_memmaps:
-            del volume_memmap
+        # Close all the memmaps - All 3 needed to allow deletion of temporary files.
+        del volume					# Delete volume view created during .tif file writing.
+        del intersection_volume		# Delete volume view created during .tif file writing.
+        del volume_memmaps[:] 		# Delete all the memmaps.
 
-        # Delete the temporary volume files
-        shutil.rmtree(
-            join_path(
-                config.output_file_folder,
-                format_backproject_tempvolumes(config.output_file_name),
-            )
-        )
+        # Delete the temporary volume files.
+        # Errors ignored because leaving a temporary file around is better than failing.  Could add logging.
+        shutil.rmtree(temp_folder_path, ignore_errors=True)
 
         self.add_timing("export", time.perf_counter() - start)
 
@@ -365,7 +362,7 @@ def _process(self, input_data: any) -> tuple[any, None] | tuple[None, any]:
                     delete_intermediate=False,
                     compression=config.backprojection_compression,
                     metadata=metadata,
-                    resolution=resolution, 	# XY Resolution
+                    resolution=resolution,     # XY Resolution
                     resolutionunit=resolutionunit,
                 )
             except BaseException as e: