[codychan]

Originally Posted by jcn363

Sorry, can't see what the problem is.
You can create a folder into kobopatch src (kobopatch_4.11.12019/src/delete_files) and there put the files with the content you need.
Perhaps something like:

Spoiler:

#!/bin/sh

rm usr/local/Trolltech/QtEmbedded-4.6.2-arm/lib/fonts/Amasis*
# rm /usr/local/Trolltech/QtEmbedded-4.6.2-arm/lib/fonts/Avenir*
rm usr/local/Trolltech/QtEmbedded-4.6.2-arm/lib/fonts/Caecilia*
# rm usr/local/Trolltech/QtEmbedded-4.6.2-arm/lib/fonts/georgia*
rm usr/local/Trolltech/QtEmbedded-4.6.2-arm/lib/fonts/GillSans*
rm usr/local/Trolltech/QtEmbedded-4.6.2-arm/lib/fonts/KBJ*
rm usr/local/Trolltech/QtEmbedded-4.6.2-arm/lib/fonts/KoboNickel*
rm usr/local/Trolltech/QtEmbedded-4.6.2-arm/lib/fonts/Malabar*
rm usr/local/Trolltech/QtEmbedded-4.6.2-arm/lib/fonts/OpenDyslexic*

rm /etc/udev/rules.d/delete_fonts.rules
rm /root/delete_fonts.sh

Note I've commented Avenir and Georgia because they are system fonts. Perhaps you want to replace them with yours.
Then add the correspondant lines into files section of kobopatch.yaml:

Spoiler:

files:
  src/delete_files/delete_fonts.rules: etc/udev/rules.d/delete_fonts.rules
  src/delete_files/delete_fonts.sh: root/delete_fonts.sh

Good luck.

Thanks for your advice. I tried your method, and successfully deleted several fonts in kobo system-wide fonts directory(/usr/local/Trolltech/QtEmbedded-4.6.2-arm/lib/fonts/), and they are no longer in the drop-list of changing-font in reading page.

But when I tried to add fonts into kobo system-wide fonts directory, the fonts I added are not in the drop-list(BTW, the fonts I added are working fine when sideloaded into fonts directory), so I did a little trick, add the following line to the end of the shell script which removes the fonts to list all fonts in /usr/local/Trolltech/QtEmbedded-4.6.2-arm/lib/fonts/ and print the list into `nickel home` directory:

ls usr/local/Trolltech/QtEmbedded-4.6.2-arm/lib/fonts/* > /mnt/onboard/fonts-list

So I check the list in fonts-list when I connect my Kobo to PC. And the fonts I added are exactly all in the list(as expected, the fonts I deleted are not in the list). It means I did add them into usr/local/Trolltech/QtEmbedded-4.6.2-arm/lib/fonts/ but Kobo cannot recognize them when I want to change fonts when I'm reading. Why is that?

And I notice another thing, when I extract the kobo firmware zip file and try to open *ANY* font in the kobo-update-4.11.12019\KoboRoot\usr\local\Trolltech\QtEmbedded-4.6.2-arm\lib\fonts, it failed to open it.

Double left-clicking it in Windows10, it says

"The requested file xxx is not a valid font file."

And I tried to open it using FontForge, it failed to open it too, it says:

"xxx is not a known format (or uses features of that format fontforge does not support, or is so badly corrupted as to be unreadable)."

That is so weird.