$ git clone -n https://src.fedoraproject.org/rpms/quassel.git /var/lib/mock/f45-build-34201-680/root/chroot_tmpdir/scmroot/quassel
Cloning into '/var/lib/mock/f45-build-34201-680/root/chroot_tmpdir/scmroot/quassel'...
$ git fetch origin 577f1eb50efd6e4b198a134d0c473e97fa935ffe:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/quassel
 * [new ref]         577f1eb50efd6e4b198a134d0c473e97fa935ffe -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 577f1eb Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild