$ git clone -n https://src.fedoraproject.org/rpms/kaffeine.git /var/lib/mock/f45-build-14529-461/root/chroot_tmpdir/scmroot/kaffeine
Cloning into '/var/lib/mock/f45-build-14529-461/root/chroot_tmpdir/scmroot/kaffeine'...
$ git fetch origin e0a16fd504d8aa067f8864c74fc5b19f64b33a94:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kaffeine
 * [new ref]         e0a16fd504d8aa067f8864c74fc5b19f64b33a94 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e0a16fd Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild