$ git clone -n https://gitee.com/fundawang/libcxx.git /var/lib/mock/dist-an23-build-294053-65200/root/chroot_tmpdir/scmroot/libcxx
Cloning into '/var/lib/mock/dist-an23-build-294053-65200/root/chroot_tmpdir/scmroot/libcxx'...
$ git reset --hard fd73c1a3a0fc743d81ebf3c7361c207322126670
HEAD is now at fd73c1a add patch
$ git lfs pull