$ git clone -n https://gitee.com/zhangwenlong01/diffutils.git /var/lib/mock/dist-an23-build-504294-74854/root/chroot_tmpdir/scmroot/diffutils
Cloning into '/var/lib/mock/dist-an23-build-504294-74854/root/chroot_tmpdir/scmroot/diffutils'...
$ git fetch origin a9ce357af3bc6c101d729d479a754b7687fc8989:KOJI_FETCH_HEAD
From https://gitee.com/zhangwenlong01/diffutils
 * [new ref]         a9ce357af3bc6c101d729d479a754b7687fc8989 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a9ce357 rebuild for loongarch64