NotADirectoryError when merging books on MacOS

[Geordon VanTassle]

Frequent, but not constant error of this type when merging duplicate entries on macOS 12.6.8 with Calibre 6.27.0 (and a couple of the most recent previous versions)

calibre 6.27 embedded-python: True
macOS-12.6.8-x86_64-i386-64bit Darwin ('64bit', '')
('Darwin', '21.6.0', 'Darwin Kernel Version 21.6.0: Thu Jul 6 22:18:26 PDT 2023; root:xnu-8020.240.18.702.13~1/RELEASE_X86_64')
Python 3.10.1
OSX: ('12.6.8', ('', '', ''), 'x86_64')
Interface language: None
Successfully initialized third party plugins: Gather KFX-ZIP (from KFX Input) (2, 5, 0) && Package KFX (from KFX Input) (2, 5, 0) && Amazon.com Multiple Countries (1, 0, 0) && Clean Comments (0, 2, 1) && Clean Metadata (0, 0, 6) && Comments Cleaner (1, 11, 1) && Copy Cover To Device (2, 0, 4) && Embed Comic Metadata (1, 6, 6) && Ex Libris (1, 0, 19) && Extract RIS Citations (1, 0, 15) && Fantastic Fiction (1, 6, 4) && Fantastic Fiction Adults (1, 3, 0) && Favourites Menu (1, 3, 0) && Find Duplicates (1, 10, 8) && Generate Cover (2, 3, 3) && Goodreads (1, 7, 9) && Goodreads Sync (1, 16, 3) && Job Spy (1, 0, 239) && KFX metadata reader (from KFX Input) (2, 5, 0) && KFX Input (2, 5, 0) && Set KFX metadata (from KFX Output) (2, 3, 1) && KFX Output (2, 3, 1) && Kindle Collections (1, 7, 29) && Kindle hi-res covers (0, 5, 0) && Library Codes (1, 0, 65) && Library Splitter (1, 0, 7) && LibraryThing Match (0, 2, 2) && Manage Series (1, 5, 1) && Modify ePub (1, 8, 1) && Open With (1, 8, 1) && Prettify Cover (1, 6, 0) && Quick Preferences (1, 7, 0) && Reformat plugin (2, 4, 0) && Resize Cover (1, 2, 0) && ScrambleEbook (0, 6, 0) && Search The Internet (1, 10, 1) && SmartEject (2, 5, 0) && Smashwords Metadata (1, 0, 2) && The Anarchist Library (1, 0, 0) && Unplugged (1, 0, 0) && X-Ray Creator (3, 2, 1) && Zotero Metadata Importer (1, 0, 78) && all recipes Recipe Reader (1, 0, 2)
Traceback (most recent call last):
  File "calibre/db/backend.py", line 416, in rmtree_with_retry
  File "shutil.py", line 717, in rmtree
  File "shutil.py", line 630, in _rmtree_safe_fd
  File "shutil.py", line 626, in _rmtree_safe_fd
NotADirectoryError: [Errno 20] Not a directory: '/Volumes/Calibre Library/Calibre Library/.caltrash/b/.DS_Store'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "calibre/gui2/actions/edit_metadata.py", line 679, in merge_books
  File "calibre/gui2/actions/edit_metadata.py", line 732, in delete_books_after_merge
  File "calibre/gui2/library/models.py", line 465, in delete_books_by_id
  File "calibre/db/cache.py", line 85, in call_func_with_lock
  File "calibre/db/cache.py", line 2083, in remove_books
  File "calibre/db/backend.py", line 2168, in remove_books
  File "calibre/db/backend.py", line 2027, in ensure_trash_dir
  File "calibre/db/backend.py", line 2052, in expire_old_trash
  File "calibre/db/backend.py", line 422, in rmtree_with_retry
  File "shutil.py", line 717, in rmtree
  File "shutil.py", line 630, in _rmtree_safe_fd
  File "shutil.py", line 626, in _rmtree_safe_fd
NotADirectoryError: [Errno 20] Not a directory: '/Volumes/Calibre Library/Calibre Library/.caltrash/b/.DS_Store'

[Kovid Goyal (kovid)]

Fixed in branch master. The fix will be in the next release. calibre is usually released every alternate Friday.