$ git clone -n https://src.fedoraproject.org/rpms/helix.git /var/lib/mock/f41-build-852055-166208/root/chroot_tmpdir/scmroot/helix
Cloning into '/var/lib/mock/f41-build-852055-166208/root/chroot_tmpdir/scmroot/helix'...
$ git fetch origin e49e4623551236f5d377693d4c85789aad6e4811:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/helix
 * [new ref]         e49e4623551236f5d377693d4c85789aad6e4811 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e49e462 Update gix dependency to 0.66