$ git clone -n https://src.fedoraproject.org/rpms/R-bit64.git /var/lib/mock/f40-build-789303-135702/root/chroot_tmpdir/scmroot/R-bit64
Cloning into '/var/lib/mock/f40-build-789303-135702/root/chroot_tmpdir/scmroot/R-bit64'...
$ git fetch origin d1118f7d925c8d2bd2139e3f1b952310d9bb42e5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-bit64
 * [new ref]         d1118f7d925c8d2bd2139e3f1b952310d9bb42e5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d1118f7 Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild