$ git clone -n https://src.fedoraproject.org/rpms/rocksndiamonds.git /var/lib/mock/f42-build-side-1-3500256-45970/root/chroot_tmpdir/scmroot/rocksndiamonds
Cloning into '/var/lib/mock/f42-build-side-1-3500256-45970/root/chroot_tmpdir/scmroot/rocksndiamonds'...
$ git fetch origin 9fff12d404f306f957fa479ad0b0c35d76f8c879:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rocksndiamonds
 * [new ref]         9fff12d404f306f957fa479ad0b0c35d76f8c879 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9fff12d 4.4.0.4