$ git clone -n https://gitee.com/rabbitali/clang.git /var/lib/mock/dist-an23-build-490486-74493/root/chroot_tmpdir/scmroot/clang
Cloning into '/var/lib/mock/dist-an23-build-490486-74493/root/chroot_tmpdir/scmroot/clang'...
$ git fetch origin c71639d11d277bc7301cbd0749112141696909e1:KOJI_FETCH_HEAD
From https://gitee.com/rabbitali/clang
 * [new ref]         c71639d11d277bc7301cbd0749112141696909e1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c71639d Update code from upstream