$ git clone -n https://src.fedoraproject.org/rpms/diffutils.git /var/lib/mock/f40-build-777664-129469/root/chroot_tmpdir/scmroot/diffutils
Cloning into '/var/lib/mock/f40-build-777664-129469/root/chroot_tmpdir/scmroot/diffutils'...
$ git fetch origin 9421e38500804f1f240a96036d03ac6d1960df6a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/diffutils
 * [new ref]         9421e38500804f1f240a96036d03ac6d1960df6a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9421e38 Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild