$ git clone -n https://src.fedoraproject.org/rpms/R-kernlab.git /var/lib/mock/f40-build-789475-135730/root/chroot_tmpdir/scmroot/R-kernlab
Cloning into '/var/lib/mock/f40-build-789475-135730/root/chroot_tmpdir/scmroot/R-kernlab'...
$ git fetch origin 9f39e0a5ad11d9ed71ad006ce92f17451d0b1a2e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-kernlab
 * [new ref]         9f39e0a5ad11d9ed71ad006ce92f17451d0b1a2e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9f39e0a Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild