$ git clone -n https://src.fedoraproject.org/rpms/localsearch.git /var/lib/mock/f42-build-3426604-45197/root/chroot_tmpdir/scmroot/localsearch
Cloning into '/var/lib/mock/f42-build-3426604-45197/root/chroot_tmpdir/scmroot/localsearch'...
$ git fetch origin b6ca6cc7a215f2090b4df544a888914a907b1646:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/localsearch
 * [new ref]         b6ca6cc7a215f2090b4df544a888914a907b1646 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b6ca6cc Update to 3.9~rc