$ git clone -n https://gitee.com/fundawang/libcxx.git /var/lib/mock/dist-an23-build-294194-65224/root/chroot_tmpdir/scmroot/libcxx
Cloning into '/var/lib/mock/dist-an23-build-294194-65224/root/chroot_tmpdir/scmroot/libcxx'...
$ git reset --hard a97bf4027e0c74b635b7564a48f9c02b98f22ebe
HEAD is now at a97bf40 16.0.6
$ git lfs pull