Font SimSun doesn't work

[sidey]

Describe the bug
docx with SimSun font can't render normally after I put a SimuSun font into the docker container and restart it

To Reproduce
Steps to reproduce the behavior:

1. start up collabora office online with docker image 6.4.0.14

2. download font SimSun
   simsun.zip

3. put SimSun.ttc into /usr/share/fonts/ of the container.

4. execute fc-cache -fv and fc-list :lang=zh

/usr/share/fonts/simsun.ttc: SimSun,宋体:style=Regular,常规
/usr/share/fonts/simsun.ttc: NSimSun,新宋体:style=Regular,常规

5. restart container
6. trying to open a docx of characters with a SimSun font.
   test_utf-8.docx

Expected behavior
the document cant be opened in browser normally.

Actual behavior
an empty document

Desktop (please complete the following information)

• OS: docker docker.io/collabora/code:6.4.0.14
• Browser: chrome 86.0.4240.111
• Version: 6.4.0.14

Additional context
I think the SimSun font file works,because characters with other fonts are rendered normally,except collabora changed their fonts to sans-serif

[sidey]

I've solved this problem according to this article:
https://help.nextcloud.com/t/collobora-online-and-docker-how-to-add-new-fonts/65750/9
In fact:
the font files must been put in folder container:/opt/collaboraoffice{version}/share/fonts/truetype/
but not container:/usr/share/fonts/truetype/

[mrkara]

@sidey Thank you for creating the issue report, and then also sharing the solution. :)

This looks like a very good fit for our forum where COOL installation and configuration topics belong to: https://forum.collaboraonline.com/c/installation-configuration/10

I'll try to move your question, along with the solution, to the forum soon, but if you would like to do it yourself, please feel free to beat me to it by opening a new topic. That's very welcome.

Thank you again! :)

[sidey]

@mrkara Please feel free to create a topic on collaboraonline forum about this solution.
And thanks for your work on CODE :)