[Bug 1803534] Re: Backport uuid based cache file naming scheme

[James Henstridge]

A backport of the UUID cache file directory feature from fontconfig
2.13.

** Patch added: "fontconfig_2.12.6-0ubuntu2_2.12.6-0ubuntu3.diff"
   https://bugs.launchpad.net/ubuntu/+source/fontconfig/+bug/1803534/+attachment/5213086/+files/fontconfig_2.12.6-0ubuntu2_2.12.6-0ubuntu3.diff

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Title:
  Backport uuid based cache file naming scheme

Status in fontconfig package in Ubuntu:
  New

Bug description:
  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.

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