Description of problem: According to bz#1253109, createrepo_c's --xz switch only compresses SQLite data in order to remain compatible with createrepo. Proposed solution: Add --xml-xz to createrepo_c and other commands that generate XML metadata in the package to override this behavior and generate xml.xz data. Version-Release number of selected component (if applicable): createrepo_c-0.9.0-3.fc22 Additional notes: I'm not sure if DNF is capable of reading XZ compressed XML metadata. If it isn't, obviously DNF needs some fixing to be able to support this functionality.
Implemented in upstream: https://github.com/rpm-software-management/createrepo_c/commit/0240c8ecee1bde3523f33705daea8c0ddce8893a
createrepo_c-0.9.1-1.fc22 has been submitted as an update to Fedora 22. https://bodhi.fedoraproject.org/updates/FEDORA-2015-735f979d01
createrepo_c-0.9.1-1.fc22 has been pushed to the Fedora 22 testing repository. If problems still persist, please make note of it in this bug report. If you want to test the update, you can install it with $ su -c 'dnf --enablerepo=updates-testing update createrepo_c' You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2015-735f979d01
createrepo_c-0.9.1-1.fc22 has been pushed to the Fedora 22 stable repository. If problems still persist, please make note of it in this bug report.