Re: F26 Self Contained Change: Fontconfig cache directory change

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On Wed, Dec 21, 2016 at 11:18:54AM -0500, Randy Barlow wrote:
> > > to move it to /usr/lib/fontconfig/cache.
> > This proposal likely is incompatible to the FHS.
> > 
> > Files in directories below /usr/lib are supposed to static and not
> > to be  dynamically created.
> I agree - let's not violate FHS.

Keeping to standards where they make sense is valuable. In this case, I
want it to be clear that this isn't just a "doesn't meet red tape!
denied!" stamp — the desire is to avoid runtime-generated files under
/usr, right?

When I look at the details, this seems like an edge case. See the
linked bug (https://bugzilla.redhat.com/show_bug.cgi?id=1377367). This
isn't really _runtime_ variable content. It's generated at
package install time. The FHS says:

   /var is specified here in order to make it possible to mount /usr
   read-only. Everything that once went into /usr that is written to
   during system operation (as opposed to installation and software
   maintenance) must be in /var.

... and the thing is, this particular cache is generated during
"installation and software maintenance".

I see that the fc-cache data is arch-specific, but is it really
host-specific? What if we just pre-generated it at *build* time and put
it into /usr/share or /usr/lib? I guess that'd end up making font files
archful, but that's not the worst thing.

Hmmm, I see that the arch-specific part is encoded in the filename
(like d3379abda271c4acd2ad0c01f565d0b0-le64.cache-7). None of this
stuff is very big; only a few k per font. What if we just included all
of the arch-specific files in every font package?

Bonus: less stuff run in %post scripts!

-- 
Matthew Miller
<mattdm@xxxxxxxxxxxxxxxxx>
Fedora Project Leader
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