$ git clone -n https://src.fedoraproject.org/rpms/gimp-lensfun.git /var/lib/mock/f41-build-side-1-3079838-38944/root/chroot_tmpdir/scmroot/gimp-lensfun
Cloning into '/var/lib/mock/f41-build-side-1-3079838-38944/root/chroot_tmpdir/scmroot/gimp-lensfun'...
$ git fetch origin 28b6f3dc669bafc7b1c1586e05ee8d9868f1f0d4:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gimp-lensfun
 * [new ref]         28b6f3dc669bafc7b1c1586e05ee8d9868f1f0d4 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 28b6f3d Upstream is no longer maintained