Description of problem: Yum has changed (in rawhide, 20 updates and 19 updates-testing) the default value of distroverpkg to a list: ['system-release(release)', 'redhat-release']. The default for dnf should probably be the same to minimize confusion switching between the two. (Though in fedora there isn't likely to be an issue as redhat-release is provided and will be the same as system-release(release) if it is provided.) Version-Release number of selected component (if applicable): dnf-0.4.9-1.fc21.noarch
Another note about this is that dnf maintains its own version of _getsysver and hasn't changed to match yum's change to make distroverpkg a list. That would have to happen before the default can change.
It's true, this poorly planned decision was implemented in Yum (without consulting us) and we let it slide by for the time. Will keep this open but giving it a low priority for now as nobody is affected by this.
Fixed upstream by ba54035.
dnf-plugins-core-0.1.1-2.fc20, dnf-0.5.3-1.fc20, hawkey-0.4.17-1.fc20 has been submitted as an update for Fedora 20. https://admin.fedoraproject.org/updates/dnf-0.5.3-1.fc20,hawkey-0.4.17-1.fc20,dnf-plugins-core-0.1.1-2.fc20
Package dnf-plugins-core-0.1.1-2.fc20, dnf-0.5.3-1.fc20, hawkey-0.4.17-1.fc20: * should fix your issue, * was pushed to the Fedora 20 testing repository, * should be available at your local mirror within two days. Update it with: # su -c 'yum update --enablerepo=updates-testing dnf-plugins-core-0.1.1-2.fc20 dnf-0.5.3-1.fc20 hawkey-0.4.17-1.fc20' as soon as you are able to. Please go to the following url: https://admin.fedoraproject.org/updates/FEDORA-2014-8167/dnf-0.5.3-1.fc20,hawkey-0.4.17-1.fc20,dnf-plugins-core-0.1.1-2.fc20 then log in and leave karma (feedback).
dnf-plugins-core-0.1.1-2.fc20, dnf-0.5.3-1.fc20, hawkey-0.4.17-1.fc20 has been pushed to the Fedora 20 stable repository. If problems still persist, please make note of it in this bug report.