Comment # 13 on bug 904422 from Dominique Leuenberger

(In reply to Jiri Slaby from comment #12)
> Perhaps executing something like /etc/events/os-release.d/* from the
> *release.rpm and put grub2.sh in there (via grub2.rpm) to do the work?

I actually like this approach: it ensures that the logic for the content of
grub owned files stays with grub.

The 'issue' might be that openSUSE-release, especially in Tumbleweed, is being
updated at every snapshot. So overwriting /etc/default/grub all the time might
not be welcome there.

for Leap 42.1, this is less of an issue, as the openSUSE-release package won't
be updated post release...

I can add something like this to opensuse-release.spec:

%post
for script in %{_sysconfdir}/events/os-release.d/*; do
  if [ -x "$script" ]; then
    $script || :
  fi
done