$ git clone -n https://src.fedoraproject.org/rpms/R-bench.git /var/lib/mock/f38-build-side-42-init-devel-883447-28486/root/chroot_tmpdir/scmroot/R-bench
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-883447-28486/root/chroot_tmpdir/scmroot/R-bench'...
$ git fetch origin 9ad6e8ccbe0205225361c6ee87e0f818afff3949:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-bench
 * [new ref]         9ad6e8ccbe0205225361c6ee87e0f818afff3949 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9ad6e8c Rebuilt for https://fedoraproject.org/wiki/Fedora_38_Mass_Rebuild