$ git clone -n https://src.fedoraproject.org/rpms/R-qtl.git /var/lib/mock/f45-build-6354-348/root/chroot_tmpdir/scmroot/R-qtl
Cloning into '/var/lib/mock/f45-build-6354-348/root/chroot_tmpdir/scmroot/R-qtl'...
$ git fetch origin e1d62b99b96eec61151172e16079b2ef8287947c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-qtl
 * [new ref]         e1d62b99b96eec61151172e16079b2ef8287947c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e1d62b9 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild