$ git clone -n https://src.fedoraproject.org/rpms/flann.git /var/lib/mock/f40-build-752594-116812/root/chroot_tmpdir/scmroot/flann
Cloning into '/var/lib/mock/f40-build-752594-116812/root/chroot_tmpdir/scmroot/flann'...
$ git fetch origin 5050af45e36220589d7f772085de71069982a186:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/flann
 * [new ref]         5050af45e36220589d7f772085de71069982a186 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5050af4 Fix pkgconfig file and add lz4-devel requirement to -devel package