Compatibility with packing read-only source files

File permissions are no longer copied when packing. This means that
read-only source files can still be packed without errors, even when
they have to be rewritten (due to changed paths).

Reviewed by: sybren

Differential Revision: https://developer.blender.org/D13128

blender_asset_tracer/blendfile/__init__.py

@@ -206,7 +206,8 @@ class BlendFile:
 
         self.log.debug("Copying %s to %s", self.filepath, path)
         # TODO(Sybren): remove str() calls when targeting Python 3.6+
-        shutil.copy(str(self.filepath), str(path))
+        # dst needs to be a file and not a directory
+        shutil.copyfile(str(self.filepath), str(path))
 
         self.fileobj = self._open_file(path, mode=mode)
         _cache(path, self)

blender_asset_tracer/pack/filesystem.py

@@ -152,12 +152,12 @@ class FileCopier(transfer.FileTransferer):
         return True
 
     def _move(self, srcpath: pathlib.Path, dstpath: pathlib.Path):
-        """Low-level file move"""
+        """Low-level file move."""
         shutil.move(str(srcpath), str(dstpath))
 
     def _copy(self, srcpath: pathlib.Path, dstpath: pathlib.Path):
-        """Low-level file copy"""
-        shutil.copy2(str(srcpath), str(dstpath))
+        """Low-level file copy. dstpath needs to be a file and not a directory."""
+        shutil.copyfile(str(srcpath), str(dstpath))
 
     def move(self, srcpath: pathlib.Path, dstpath: pathlib.Path):
         s_stat = srcpath.stat()