ran into oddish glitch on fedora 30 cloud image with tooling based on
libvirt-python onpython3.7. *qemu-img *is installed though. Could anyone
have a look.

I don't see qemu-img installed there. You've requested 'qemu-kvm' and
'qemu-system-x86' which provide the system emulator. qemu-img is part
of the 'qemu-utils' package, which is a Recommended dependancy of
qemu-system-x86, but you've not told apt to install recommendations
AFAICT from that log

Thanks for coming back. With greatest respect, I can see it clearly installed here:

https://travis-ci.com/cherusk/godon/builds/144068483#L432

Probably you're right, but find the separately packaged qemu-img non-intiutitive or confusing then.

-- 
Regards


Matthias