$ git clone -n https://src.fedoraproject.org/rpms/cellwriter.git /var/lib/mock/f45-build-3925-329/root/chroot_tmpdir/scmroot/cellwriter
Cloning into '/var/lib/mock/f45-build-3925-329/root/chroot_tmpdir/scmroot/cellwriter'...
$ git fetch origin 2fab12d7865c3fc1181a99b1a1a4c2a44631191b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/cellwriter
 * [new ref]         2fab12d7865c3fc1181a99b1a1a4c2a44631191b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2fab12d Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild