$ git clone -n https://src.fedoraproject.org/rpms/lighttpd.git /var/lib/mock/f41-build-833351-157837/root/chroot_tmpdir/scmroot/lighttpd
Cloning into '/var/lib/mock/f41-build-833351-157837/root/chroot_tmpdir/scmroot/lighttpd'...
$ git fetch origin b04309dd9923ce576ba48ab911823573ab7ceb15:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/lighttpd
 * [new ref]         b04309dd9923ce576ba48ab911823573ab7ceb15 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b04309d Upstream suggestions