Problem with kobo driver (fw 5.x) and cover image

[beedaddy]

While I was trying to adapt the kobo driver to the new tolino fw 5.11.230427 (no significant db changes, just updating version numbers) I noticed that calibre does not upload the cover image anymore. I think™ that it worked with 5.10.x. And there have not been any relevant db changes.

So I wonder what happened. Have there been any code changes recently that might have broken something?

Here is some debug output (notice the "No rows exist in the database" entry):

Job: 4 Buch auf Gerät übertragen: Das Geisterhaus started
Device using plugboard epub KOBOTOUCH None
Setting metadata in: Das Geisterhaus at: /tmp/calibre-je9fxov2/6lzo2a9ncaltmpfmt.epub
DEBUG:    5.7 KoboTouch:upload_books - 1 books
DEBUG:    5.7 KoboTouch:upload_books - files= ['/tmp/calibre-je9fxov2/6lzo2a9ncaltmpfmt.epub']
DEBUG:    5.8 KoboTouch:upload_books: Processing book: Das Geisterhaus by Isabel Allende
DEBUG:    5.8 KoboTouch:upload_books: file=/tmp/calibre-je9fxov2/6lzo2a9ncaltmpfmt.epub, name=Das Geisterhaus - Isabel Allende_4.epub
DEBUG:    5.8 KoboTouch:_modify_epub:Processing Allende, Isabel - Das Geisterhaus
DEBUG:    5.8 KoboTouch:create_container: try to create new container
DEBUG:    5.8 KoboTouch:_modify_epub: Modifying OEBPS/stylesheet.css
DEBUG:    5.8 KoboTouch:_modify_stylesheet: Append all kobo extra css rules
DEBUG:    5.8 KoboTouch:_modify_epub:CSS rules 34 -> 35 (OEBPS/stylesheet.css)
DEBUG:    5.8 KoboTouch:_modify_epub: committing container.
DEBUG:    5.8 KoboTouch:commit_container: commit container.
DEBUG:    7.0 KoboTouch:commit_container: removing container temp files.
DEBUG:    7.0 USBMS: uploading 1 books
DEBUG:    7.3 KoboTouch:upload_cover - path='/run/media/martin/eReader/Books' filename='Geisterhaus, Das - Isabel Allende' 
DEBUG:    7.3         filepath='/run/media/martin/eReader/Books/Geisterhaus, Das - Isabel Allende.epub' 
DEBUG:    7.3 KoboTouch:_upload_cover - filename='Geisterhaus, Das - Isabel Allende' upload_grayscale='False' dithered_covers='False' 
DEBUG:    7.3 KoboTouch:get_content_type_from_extension - start
DEBUG:    7.3 KoboTouch:_upload_cover - No rows exist in the database - generated ImageID='file____mnt_onboard_Books_Geisterhaus,_Das_-_Isabel_Allende.epub'
DEBUG:    7.7 USBMS: finished uploading 1 books

Any ideas how I can debug this further?

[kovidgoyal]

Turn on show_debug in the _upload_cover() function and you will get even more debug output.

[beedaddy]

Thanks! This allowed me to determine the cause (max_dbversion exceeded; see PR 2881).