$ git clone -n https://src.fedoraproject.org/rpms/R-metaheuristicopt.git /var/lib/mock/f38-build-side-42-init-devel-941728-28760/root/chroot_tmpdir/scmroot/R-metaheuristicopt
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-941728-28760/root/chroot_tmpdir/scmroot/R-metaheuristicopt'...
$ git fetch origin 7614b47153dd167efa452b4844f3ebdf6b03144b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-metaheuristicopt
 * [new ref]         7614b47153dd167efa452b4844f3ebdf6b03144b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7614b47 R-maint-sig mass rebuild