$ git clone -n https://src.fedoraproject.org/rpms/R-desc.git /var/lib/mock/f40-build-2285003-55666/root/chroot_tmpdir/scmroot/R-desc
Cloning into '/var/lib/mock/f40-build-2285003-55666/root/chroot_tmpdir/scmroot/R-desc'...
$ git fetch origin 64cf60baada105e5d2e34549e8c6e0df62228764:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-desc
 * [new ref]         64cf60baada105e5d2e34549e8c6e0df62228764 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 64cf60b Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild