$ git clone -n https://src.fedoraproject.org/rpms/R-base64enc.git /var/lib/mock/f40-build-789298-135702/root/chroot_tmpdir/scmroot/R-base64enc
Cloning into '/var/lib/mock/f40-build-789298-135702/root/chroot_tmpdir/scmroot/R-base64enc'...
$ git fetch origin 7d164d35170f7428077d2933e21b18a0ddaba956:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-base64enc
 * [new ref]         7d164d35170f7428077d2933e21b18a0ddaba956 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7d164d3 Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild