$ git clone -n https://src.fedoraproject.org/rpms/rush.git /var/lib/mock/f45-build-35446-695/root/chroot_tmpdir/scmroot/rush
Cloning into '/var/lib/mock/f45-build-35446-695/root/chroot_tmpdir/scmroot/rush'...
$ git fetch origin f7cacab5d1d0b6f177115d5f20e433d6c4fb72d3:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rush
 * [new ref]         f7cacab5d1d0b6f177115d5f20e433d6c4fb72d3 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f7cacab Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild