$ git clone -n https://gitee.com/chen_yu_ao/libcxx /var/lib/mock/dist-an23-build-209098-61859/root/chroot_tmpdir/scmroot/libcxx
Cloning into '/var/lib/mock/dist-an23-build-209098-61859/root/chroot_tmpdir/scmroot/libcxx'...
$ git reset --hard 20dff2124cf97aeb55a762b891a390404bea3340
HEAD is now at 20dff21 Init package from upstream