By pure fluke I ran "dnf check-update --refresh" not as root and got:
RuntimeError: C++ std::exception: Failed to open backup database:
/var/lib/dnf/history/history-2015-04-01.sqlite
Surprising in that I have run this command not as root before and it didn't
fail, but the file was owned root:root on 0600 so the failure is not a
surprise. The file being in /var I took the view that it is ephemeral and so
deleted it.
Now as root I get proper behaviour, and indeed as not root I get proper
behaviour.
I am now upgrading all my Fedora Rawhide machines.
:-)
--
Russel.
===========================================
Dr Russel Winder t: +44 20 7585 2200
41 Buckmaster Road m: +44 7770 465 077
London SW11 1EN, UK w:
www.russel.org.uk