$ git clone -n https://src.fedoraproject.org/rpms/rapidjson.git /var/lib/mock/f39-build-2039519-48190/root/chroot_tmpdir/scmroot/rapidjson
Cloning into '/var/lib/mock/f39-build-2039519-48190/root/chroot_tmpdir/scmroot/rapidjson'...
$ git fetch origin 3f85f1f55728dfd7f7e95717f3c9d21e1e711eb8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rapidjson
 * [new ref]         3f85f1f55728dfd7f7e95717f3c9d21e1e711eb8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3f85f1f Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild