$ git clone -n https://src.fedoraproject.org/rpms/reflection-cpp.git /var/lib/mock/f45-build-34430-686/root/chroot_tmpdir/scmroot/reflection-cpp
Cloning into '/var/lib/mock/f45-build-34430-686/root/chroot_tmpdir/scmroot/reflection-cpp'...
$ git fetch origin 46fddf0b5d5384145d7a0a9143bdbf6c706fc7d1:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/reflection-cpp
 * [new ref]         46fddf0b5d5384145d7a0a9143bdbf6c706fc7d1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 46fddf0 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild