$ git clone -n https://src.fedoraproject.org/rpms/foo2zjs.git /var/lib/mock/f45-build-9160-399/root/chroot_tmpdir/scmroot/foo2zjs
Cloning into '/var/lib/mock/f45-build-9160-399/root/chroot_tmpdir/scmroot/foo2zjs'...
$ git fetch origin 213c7a7958b38aa83aab59bd07c0232a3e2612ae:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/foo2zjs
 * [new ref]         213c7a7958b38aa83aab59bd07c0232a3e2612ae -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 213c7a7 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild