$ git clone -n https://gitee.com/wency_cn/clang.git /var/lib/mock/dist-an23-build-492017-74553/root/chroot_tmpdir/scmroot/clang
Cloning into '/var/lib/mock/dist-an23-build-492017-74553/root/chroot_tmpdir/scmroot/clang'...
$ git fetch origin 19c910e0b28944f700e5c5a8200c9411939a39bd:KOJI_FETCH_HEAD
From https://gitee.com/wency_cn/clang
 * [new ref]         19c910e0b28944f700e5c5a8200c9411939a39bd -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 19c910e Update code from upstream