$ git clone -n https://src.fedoraproject.org/rpms/chicken.git /var/lib/mock/f45-build-6717-350/root/chroot_tmpdir/scmroot/chicken
Cloning into '/var/lib/mock/f45-build-6717-350/root/chroot_tmpdir/scmroot/chicken'...
$ git fetch origin 77ff32eac4d726a04430fdf5e08079cc9663ead2:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/chicken
 * [new ref]         77ff32eac4d726a04430fdf5e08079cc9663ead2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 77ff32e Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild