$ git clone -n https://src.fedoraproject.org/rpms/flare.git /var/lib/mock/f45-build-9258-400/root/chroot_tmpdir/scmroot/flare
Cloning into '/var/lib/mock/f45-build-9258-400/root/chroot_tmpdir/scmroot/flare'...
$ git fetch origin 285a907e7bc675684b6ea138b5e9865a05d72e60:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/flare
 * [new ref]         285a907e7bc675684b6ea138b5e9865a05d72e60 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 285a907 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild