[Bug 1803534] [NEW] Backport uuid based cache file naming scheme

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You have been subscribed to a public bug by Ubuntu Foundations Team Bug Bot (crichton):

Fontconfig 2.13.0 changed the cache file naming scheme to be based on
the contents of ".uuid" file in the directory rather than a hash of the
directory name.  On a pure debs system this doesn't really matter since
everything is using the same libfontconfig.so.

When snaps are involved, it can lead to some apps not seeing the cache
files produced by a different fontconfig version.  In particular, while
libfontconfig 2.13 can reuse 2.12's cache files for read only
directories, the reverse is not true.  This will be a problem for apps
built on top of the "core18" base snap when run on later Ubuntu releases
(cosmic, disco, etc).

By providing a backport of the UUID cache file feature to bionic for use
by snap applications, we'd avoid this.  Having it in bionic-updates
would be ideal so that snapcraft picks it up automatically.

** Affects: fontconfig (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: patch
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Backport uuid based cache file naming scheme
https://bugs.launchpad.net/bugs/1803534
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