$ git clone -n https://src.fedoraproject.org/rpms/R-desc.git /var/lib/mock/f38-build-side-42-init-devel-894165-28550/root/chroot_tmpdir/scmroot/R-desc
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-894165-28550/root/chroot_tmpdir/scmroot/R-desc'...
$ git fetch origin 83d6571cb55ab35bba1e295226d724d68c08be56:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-desc
 * [new ref]         83d6571cb55ab35bba1e295226d724d68c08be56 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 83d6571 Rebuilt for https://fedoraproject.org/wiki/Fedora_38_Mass_Rebuild