$ git clone -n https://src.fedoraproject.org/rpms/flann.git /var/lib/mock/f38-build-side-42-init-devel-698229-27040/root/chroot_tmpdir/scmroot/flann
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-698229-27040/root/chroot_tmpdir/scmroot/flann'...
$ git fetch origin 75e8ea433e8d5203dac0fc3187ebe5f69c74fe5b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/flann
 * [new ref]         75e8ea433e8d5203dac0fc3187ebe5f69c74fe5b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 75e8ea4 Rebuilt for https://fedoraproject.org/wiki/Fedora_38_Mass_Rebuild