$ git clone -n https://gitee.com/wenyuzifang/clang.git /var/lib/mock/dist-an23-build-480553-74252/root/chroot_tmpdir/scmroot/clang
Cloning into '/var/lib/mock/dist-an23-build-480553-74252/root/chroot_tmpdir/scmroot/clang'...
$ git fetch origin e63d89e52589e16a89c3dc623e5f1b36e31cd03e:KOJI_FETCH_HEAD
From https://gitee.com/wenyuzifang/clang
 * [new ref]         e63d89e52589e16a89c3dc623e5f1b36e31cd03e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e63d89e Update code from upstream