$ git clone -n https://src.fedoraproject.org/rpms/appstream0.16.git /var/lib/mock/f40-build-2397151-60542/root/chroot_tmpdir/scmroot/appstream0.16
Cloning into '/var/lib/mock/f40-build-2397151-60542/root/chroot_tmpdir/scmroot/appstream0.16'...
$ git fetch origin 79fb9d78b7a7ec60a53103a129a5166a17fbce1e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/appstream0.16
 * [new ref]         79fb9d78b7a7ec60a53103a129a5166a17fbce1e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 79fb9d7 All users ported to appstream-1.x