$ git clone -n https://gitee.com/wenyuzifang/clang.git /var/lib/mock/dist-an23-build-469643-74027/root/chroot_tmpdir/scmroot/clang
Cloning into '/var/lib/mock/dist-an23-build-469643-74027/root/chroot_tmpdir/scmroot/clang'...
$ git fetch origin d4a2f1f8fe01bb417a2dd29b5768524930e705c9:KOJI_FETCH_HEAD
From https://gitee.com/wenyuzifang/clang
 * [new ref]         d4a2f1f8fe01bb417a2dd29b5768524930e705c9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d4a2f1f Update code from upstream