[eschwartz]

Originally Posted by eschwartz

calibre's Auto-add folder on the server only works if you have the calibre GUI running (headless).

I suggest exporting books to a temporary folder on the server (shared over NAS) and using a cron/systemd job backed by inotify to add all books added to that folder, and clean them up afterward.

calibre has many useful CLI tools you probably want `calibredb restore_database` to fix the remote library, and `calibredb add --one-book-per-directory` to add books exported from calibre on your Mac.

What I would suggest doing, again, is cleaning up the books the way you want it on your Mac, then using Save-to-disk to save them in one-book-per-folder layout.
Save them inside a folder on your server, e.g. /tmp/calibre-intake/

Then adding them to your linux server using the CLI as I said above.

calibredb add -r --one-book-per-directory /tmp/calibre-intake/
rm -rf /path/to/ebook-folder/*

You can automate that in a script, which uses inotify to tell when the /tmp/calibre-intake/ folder changes:

while inotifywait -e create /tmp/calibre-intake; do
    calibredb add -r --one-book-per-directory /tmp/calibre-intake/
    rm -rf /tmp/calibre-intake/*
done

You can also convert that to a system service (now I think about it, NOT as a cron job). How to do this will depend on what init system your server uses.