$ git clone -n https://src.fedoraproject.org/rpms/qxmpp.git /var/lib/mock/f41-build-850578-165462/root/chroot_tmpdir/scmroot/qxmpp
Cloning into '/var/lib/mock/f41-build-850578-165462/root/chroot_tmpdir/scmroot/qxmpp'...
$ git fetch origin 50d742579200522ae99728635c57d57c2bd3a00c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/qxmpp
 * [new ref]         50d742579200522ae99728635c57d57c2bd3a00c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 50d7425 Update to 1.8.0 upstream release