Alexander Larsson <alexander.larsson@xxxxxxxxx> writes: > Ugh. Sorry about that! Thanks. Bugs happen, fortunately I was able to track this one down and fix it (we all love free software!) > Yes:ish. It should not *normally* happen. But you may run into it in > uncommon situations like e.g. chrome using a statically linked version > of fontconfig that has a different fontconfig cache format. Hrm. I don't get the sense that we've got a solution to this problem yet. Given that the contents of the flatpak cannot change on the fly, would it be sufficient to generate a new 'salt' value for the flatpak each time it is changed? It might be sufficient to use the name of the flatpak including a version as this salt (that has the advantage of making the flatpak reproducible, which you probably want to encourage). > I agree with this, but the point was that we can't just modify the > fontconfig to be dynamic always. We need to design it such that > whatever flatpak generates is optional for the runtime to pick up when > it is able to handle it. Sounds like being able to handle an arbitrary host fonts directory mounted as /run/host/fonts will really help avoid future issues. And that needs to be in the fontconfig used inside the flatpak, which means we can't wait for a system which has fonts in a different place and plan on fixing it in the host. > Yeah, there will be two files. One static in the runtime > (/etc/fonts/conf.d/50-flatpak.xml), and one generated by flatpak > (/run/host/fontconf.xml). Sounds like we've got a plan for this part -- fix my mapping code to use config bits separate from the <dir> elements, then add a 'salt' mechanism in the config bits that stirs in some random data when generating the cache keys for specific directory trees. Let's figure out how we should handle the stale flatpak fonts cache issue. Once we've settled that, we can go implement the whole mess and get a new fontconfig release made in time for debian freeze. -- -keith
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