$ git clone -n https://src.fedoraproject.org/rpms/libspelling.git /var/lib/mock/f40-build-2008448-45373/root/chroot_tmpdir/scmroot/libspelling
Cloning into '/var/lib/mock/f40-build-2008448-45373/root/chroot_tmpdir/scmroot/libspelling'...
$ git fetch origin fb61e11207655f19b4b86e5f4433149fadd2daed:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libspelling
 * [new ref]         fb61e11207655f19b4b86e5f4433149fadd2daed -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at fb61e11 Update to 0.2.0 rhbz#2239282