$ git clone -n https://src.fedoraproject.org/rpms/kf5-kmbox.git /var/lib/mock/f45-build-14892-465/root/chroot_tmpdir/scmroot/kf5-kmbox
Cloning into '/var/lib/mock/f45-build-14892-465/root/chroot_tmpdir/scmroot/kf5-kmbox'...
$ git fetch origin caa0be062fd1adf2df8fc67ff52f34393350382c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kf5-kmbox
 * [new ref]         caa0be062fd1adf2df8fc67ff52f34393350382c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at caa0be0 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild