$ git clone -n https://src.fedoraproject.org/rpms/R-bit64.git /var/lib/mock/f39-build-1524309-36030/root/chroot_tmpdir/scmroot/R-bit64
Cloning into '/var/lib/mock/f39-build-1524309-36030/root/chroot_tmpdir/scmroot/R-bit64'...
$ git fetch origin a4201e6b132b21e5bf8fd98383d4d824bff055ca:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-bit64
 * [new ref]         a4201e6b132b21e5bf8fd98383d4d824bff055ca -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a4201e6 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild