On Fri, May 08, 2020 at 10:59:46AM +0200, Marius Bakke wrote:
> Just to be clear, these programs are able to find fonts you have
> installed through Guix, right?

They can find the font packages I install with Guix, but not the
hard-coded PostScript fonts.

> > The specific fonts in question are the URW fonts, aka the "PostScript
> > fonts", provided by Debian's gsfonts and gsfonts-x11 packages.
> 
> Are those the only affected fonts?

I looked more closely, and Guix applications can no longer see *any*
fonts from Debian.

> > $ fc-cache -rv
> 
> [...]
> 
> > /home/leo/.local/share/fonts: caching, new cache contents: 0 fonts, 0 dirs
> > /home/leo/.local/share/fonts: failed to write cache
> 
> [...]
> 
> > /home/leo/.fonts: caching, new cache contents: 0 fonts, 0 dirs
> > /home/leo/.fonts: failed to write cache
> 
> [...]
> 
> > fc-cache: failed
> 
> FWIW the new fc-cache fails for me on Guix System too if I create these
> empty directories.

Confirmed. fc-cache exited successfully when I removed those directories.

> Can you inspect 'fc-list ' with the new and old fontconfig?  Are there
> differences?

The only differences, after running `fc-cache -rfv`, are the differing
store paths of the hard-coded gs-fonts package.

Another thing I noticed is that I can do `fc-cache -rfv /usr/share/fonts
&& fc-list`, and the hundreds of fonts found in that directory are *not
shown* in fc-list, but that's the same as on the master branch.

So, I'm still not sure what the difference is.