$ git clone -n https://src.fedoraproject.org/rpms/smcalc.git /var/lib/mock/f45-build-36122-701/root/chroot_tmpdir/scmroot/smcalc
Cloning into '/var/lib/mock/f45-build-36122-701/root/chroot_tmpdir/scmroot/smcalc'...
$ git fetch origin ff7cfd9536614f64d130d5c7885ec57f6d5d2dbe:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/smcalc
 * [new ref]         ff7cfd9536614f64d130d5c7885ec57f6d5d2dbe -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ff7cfd9 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild