[Fontconfig-bugs] [Bug 96896] New: fontconfig caches/registers dpkg temporary files instead of ignoring them

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=96896

            Bug ID: 96896
           Summary: fontconfig caches/registers dpkg temporary files
                    instead of ignoring them
           Product: fontconfig
           Version: 2.11
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: fc-cache
          Assignee: fontconfig-bugs at lists.freedesktop.org
          Reporter: raphael at ouaza.com
        QA Contact: freedesktop at behdad.org

Created attachment 125020
  --> https://bugs.freedesktop.org/attachment.cgi?id=125020&action=edit
Skip over .dpkg-tmp files

During package upgrades, it happened multiple times that the labels of my GNOME
application have been replaced by many squares. When this happens, fc-list
returns entries such as this one:
/usr/share/fonts/opentype/cantarell/Cantarell-Regular.otf.dpkg-tmp

And that file is already gone at that time... this file is created by dpkg
during its unpack procedure but it is renamed back into its definitive name at
the end of the unpack procedure. It's not clear what is running the fc-cache
run at the wrong time (I suspect gnome-settings-daemon... does a call to
FcInitReinitialize updates the user's cache?). "fc-cache -s" is also run after
the unpack through a dpkg trigger and this update seems to not be enough to
have the desktop switch back to the correct font file.

I would suggest that fontconfig should skip over files finishing with .dpkg-tmp
(as in the attached patch, currently untested but it compiles fine) or that it
considers only files with extensions that are known font files.

This has been initially reported in Debian bug https://bugs.debian.org/828037

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