$ git clone -n https://src.fedoraproject.org/rpms/rust-des.git /var/lib/mock/f39-build-1488853-34499/root/chroot_tmpdir/scmroot/rust-des
Cloning into '/var/lib/mock/f39-build-1488853-34499/root/chroot_tmpdir/scmroot/rust-des'...
$ git fetch origin bc8cb01156ba76224b9ab6489d0c64286d04f005:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-des
 * [new ref]         bc8cb01156ba76224b9ab6489d0c64286d04f005 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at bc8cb01 Regenerate with rust2rpm v24