Use the same code to check if folder is in use as to move the folder

src/calibre/db/backend.py

@@ -40,12 +40,14 @@ from calibre.library.field_metadata import FieldMetadata
 from calibre.ptempfile import PersistentTemporaryFile, TemporaryFile
 from calibre.utils import pickle_binary_string, unpickle_binary_string
 from calibre.utils.config import from_json, prefs, to_json, tweaks
-from calibre.utils.copy_files import copy_files, copy_tree, rename_files
+from calibre.utils.copy_files import (
+    copy_files, copy_tree, rename_files, windows_check_if_files_in_use,
+)
 from calibre.utils.date import EPOCH, parse_date, utcfromtimestamp, utcnow
 from calibre.utils.filenames import (
-    WindowsAtomicFolderMove, ascii_filename, atomic_rename, copyfile_using_links,
+    ascii_filename, atomic_rename, copyfile_using_links, copytree_using_links,
-    copytree_using_links, hardlink_file, is_case_sensitive, is_fat_filesystem,
+    hardlink_file, is_case_sensitive, is_fat_filesystem, make_long_path_useable,
-    make_long_path_useable, remove_dir_if_empty, samefile,
+    remove_dir_if_empty, samefile,
 )
 from calibre.utils.formatter_functions import (
     compile_user_template_functions, formatter_functions, load_user_template_functions,
@@ -1717,19 +1719,14 @@ class DB:
 
     def windows_check_if_files_in_use(self, paths):
         '''
-        Raises an EACCES IOError if any of the files in the folder of book_id
+        Raises an EACCES IOError if any of the files in the specified folders
         are opened in another program on windows.
         '''
         if iswindows:
             for path in paths:
                 spath = os.path.join(self.library_path, *path.split('/'))
-                wam = None
                 if os.path.exists(spath):
-                    try:
+                    windows_check_if_files_in_use(spath)
-                        wam = WindowsAtomicFolderMove(spath)
-                    finally:
-                        if wam is not None:
-                            wam.close_handles()
 
     def add_format(self, book_id, fmt, stream, title, author, path, current_name, mtime=None):
         fmt = ('.' + fmt.lower()) if fmt else ''

src/calibre/utils/copy_files.py

@@ -8,7 +8,7 @@ import stat
 import time
 from collections import defaultdict
 from contextlib import suppress
-from typing import Callable, Dict, Set, Tuple, Union, List
+from typing import Callable, Dict, List, Set, Tuple, Union
 
 from calibre.constants import filesystem_encoding, iswindows
 from calibre.utils.filenames import make_long_path_useable, samefile, windows_hardlink
@@ -200,9 +200,13 @@ def copy_files(src_to_dest_map: Dict[str, str], delete_source: bool = False) ->
         copier.copy_all()
 
 
+def identity_transform(src_path: str, dest_path: str) -> str:
+    return dest_path
+
+
 def register_folder_recursively(
     src: str, copier: Union[UnixFileCopier, WindowsFileCopier], dest_dir: str,
-    transform_destination_filename: Callable[[str, str], str] = lambda src_path, dest_path : dest_path,
+    transform_destination_filename: Callable[[str, str], str] = identity_transform,
 ) -> None:
 
     def dest_from_entry(dirpath: str, x: str) -> str:
@@ -234,9 +238,16 @@ def register_folder_recursively(
             copier.register(path, dest)
 
 
+def windows_check_if_files_in_use(src_folder: str) -> None:
+    copier = get_copier()
+    register_folder_recursively(src_folder, copier, os.getcwd())
+    with copier:
+        pass
+
+
 def copy_tree(
     src: str, dest: str,
-    transform_destination_filename: Callable[[str, str], str] = lambda src_path, dest_path : dest_path,
+    transform_destination_filename: Callable[[str, str], str] = identity_transform,
     delete_source: bool = False
 ) -> None:
     '''