$ git clone -n https://src.fedoraproject.org/rpms/bind.git /var/lib/mock/f41-build-856610-167692/root/chroot_tmpdir/scmroot/bind
Cloning into '/var/lib/mock/f41-build-856610-167692/root/chroot_tmpdir/scmroot/bind'...
$ git fetch origin 170a2ffa18541bb575345841eb31f3cda6c55c39:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/bind
 * [new ref]         170a2ffa18541bb575345841eb31f3cda6c55c39 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 170a2ff Update to 9.18.30 (rhbz#2306542)