$ git clone -n https://src.fedoraproject.org/rpms/quake3.git /var/lib/mock/f38-build-side-42-init-devel-829173-28366/root/chroot_tmpdir/scmroot/quake3
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-829173-28366/root/chroot_tmpdir/scmroot/quake3'...
$ git fetch origin b9c951a6c4b29f1e1ca133978cbf2bdf561e212a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/quake3
 * [new ref]         b9c951a6c4b29f1e1ca133978cbf2bdf561e212a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b9c951a Rebuilt for https://fedoraproject.org/wiki/Fedora_38_Mass_Rebuild