$ git clone -n https://src.fedoraproject.org/rpms/dnsx.git /var/lib/mock/f45-build-7651-368/root/chroot_tmpdir/scmroot/dnsx
Cloning into '/var/lib/mock/f45-build-7651-368/root/chroot_tmpdir/scmroot/dnsx'...
$ git fetch origin a4d9a2383836be2965b3b8ff267b5b95bae5517b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/dnsx
 * [new ref]         a4d9a2383836be2965b3b8ff267b5b95bae5517b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a4d9a23 Update to 1.3.0 - Closes rhbz#2420897