Bug 409026

SUMMARY
Helpful person TingPing from #flatpak triggered a skrooge build on flathub, but its appdata.xml file fails validation, so the build fails.

STEPS TO REPRODUCE
1. Look at flathub build results in https://flathub.org/builds/#/apps/org.kde.skrooge

OBSERVED RESULT
The flathub build failed, error output https://flathub.org/builds/#/builders/28/builds/566/steps/12/logs/stdio includes
  flatpak run org.freedesktop.appstream-glib validate builddir/*/share/appdata/org.kde.skrooge.appdata.xml
  builddir/files/share/appdata/org.kde.skrooge.appdata.xml: FAILED:
  • tag-missing           : <content_rating> required [use https://odrs.gnome.org/oars]
  • tag-missing           : <release> required
  Validation of files failed

EXPECTED RESULT
Validation succeeds and the flatpak builds.

I compared with https://cgit.kde.org/elisa.git/tree/org.kde.elisa.appdata.xml , read about <releases><release> in https://www.freedesktop.org/software/appstream/docs/chap-Quickstart.html , looked at CHANGELOG, and guessed answers to https://odrs.gnome.org/oars , and I think the needed tags for org.kde.skrooge.appdata.xml might be:
  <content_rating type="oars-1.1" />
  <releases>
    <release version="2.19.0" date="2019-04-20"/>
    <release version="2.18.0" date="2019-02-11"/>
    <release version="2.17.0" date="2018-12-16"/>
  </releases>
prepended before its closing </component> tag, though this lacks a <description> for each release. I'll attach the revised file.

SOFTWARE/OS VERSIONS
n/a

ADDITIONAL INFORMATION
`flatpak install org.freedesktop.appstream-glib` installs the infrastructure for the failing command line above.

The reason skrooge needs a rebuild is the KDE platform runtime flatpak was updated to Qt version 5.12.4, and as I understand it, because Skrooge uses Qt plug-ins it must be rebuilt against the same libraries otherwise it fails to run with "Cannot mix incompatible Qt library". See bug 408970 and also flathub issue