Bug#864082: [Fontconfig] Next steps for a reproducible Fontconfig?

[Keith Packard]

Akira TAGOH <akira at tagoh.org> writes:

> Hi,
>
> We are still missing a piece of a salt to deal with a directory name
> separately where possibly have different fonts in sandbox etc. my tree
> based on Keith's previous implementation works and passed test cases
> except this salt thing:
>
> https://gitlab.freedesktop.org/tagoh/fontconfig/commits/flatpak-rework

Awesome, thanks for getting this going. I'm digging out from being away
from the office for a week...

> So have we got a consensus on letting flatpak provide a separate
> config file contained a salt?

Yes, that was the plan. Alexander suggested the following syntax:

     <salt id="randomdata">/usr/share/fonts</salt>

I think this will work, although it seems a bit fragile. In particular,
if the host has salt for some directories, those will be defined
relative to the host paths, not the flatpak paths.

Do we need to process the 'salt' elements and 'remap-dir' elements in
order and remap old salt elements as remap-dir elements get loaded? That
also seems fragile to me.

Perhaps some command that the flatpak could run to generate host salt
values so that it could remap them into new salt elements using the
mapped paths?

Alternatively, we could just assume that only flatpak will use the salt
mechanism and leave this for a future enhancement?

-- 
-keith
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