$ git clone -n https://src.fedoraproject.org/rpms/gnome-multi-writer.git /var/lib/mock/f45-build-11461-432/root/chroot_tmpdir/scmroot/gnome-multi-writer
Cloning into '/var/lib/mock/f45-build-11461-432/root/chroot_tmpdir/scmroot/gnome-multi-writer'...
$ git fetch origin 4e1ef4fce2f8a8b40e8868de6160c494ef4377d5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gnome-multi-writer
 * [new ref]         4e1ef4fce2f8a8b40e8868de6160c494ef4377d5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4e1ef4f Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild