Comment # 39 on bug 1071224 from Thorsten Kukuk

(In reply to Richard Brown from comment #37)

> But I expect the following line will fail on any upgrade of CaaSP or Kubic
> 
> ln -sf %{_datadir}/systemd/tmp.mount /etc/systemd/system/
> 
> IIRC /etc is not mounted during a transactional upgrade, as it's an overlayfs

It will work fine.

The real /etc is available during upgrade, only the user modifications (which
are stored in the overlayfs) are not. Which doesn't matter, in worst case we
create a symlink, which is shadowed by the user modifications.