Japanese / CJK characters don't display properly on gdm login

Japanese / CJK characters don't display properly on gdm login

[白い熊]

Hello all.

I set my system to Japanese - I think properly. I've set (locale 
"ja_JP.utf8") in system.scm and installed some CJK fonts. Then ran 
'fc-cache -f'.

Now all is set fine - even GRUB boot menu is in Japanese, all apps 
render Japanese text properly - however the gdm login screen is set to 
Japanese too, apparently it displays a Japanese welcome message - 
however all the characters are just rendered as boxes - meaning gdm is 
using some font that doesn't have the Japanese glyphs.

Anyone have an idea how I could fix this?

-- 
Best regards / 宜しく御願い致します / S pozdravem / C уважением / Z poważaniem / 
Mit freundlichen Grüßen

白い熊
ShiroiKuma

Re: Japanese / CJK characters don't display properly on gdm login

[Taiju HIGASHI]

Hi Shirokuma,

I had the same problem and was told on IRC how to solve it.

https://logs.guix.gnu.org/guix/2022-04-09.log#174359
https://libera.ems.host/_matrix/media/r0/download/libera.chat/dfe983ed94014beb4dc69a556d38bfee6d84b1e5

It may be necessary to recreate the font cache after taking the above
actions.

For reproducibility, I have added the following settings to the service
config.

(operating-system
  (services
   (append
       (list ...
             (extra-special-file "/var/lib/gdm/.config/fontconfig/fonts.conf"
                                 (plain-file "gdm-fonts.conf"
                                             "<?xml version='1.0'?>
<!DOCTYPE fontconfig SYSTEM 'fonts.dtd'>
<fontconfig>
  <dir>/run/current-system/profile/share/fonts/</dir>
</fontconfig>
")))
       %desktop-services))
...

(Sorry, I forgot to add CC, so I resent it.)

- taiju