$ git clone -n https://src.fedoraproject.org/rpms/R-ps.git /var/lib/mock/f45-build-6342-348/root/chroot_tmpdir/scmroot/R-ps
Cloning into '/var/lib/mock/f45-build-6342-348/root/chroot_tmpdir/scmroot/R-ps'...
$ git fetch origin d30bba9ab531eceecccd5b2a519e5ceed56c6776:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-ps
 * [new ref]         d30bba9ab531eceecccd5b2a519e5ceed56c6776 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d30bba9 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild