$ git clone -n https://gitee.com/wenyuzifang/mpich.git /var/lib/mock/dist-an23-build-482776-74272/root/chroot_tmpdir/scmroot/mpich
Cloning into '/var/lib/mock/dist-an23-build-482776-74272/root/chroot_tmpdir/scmroot/mpich'...
$ git fetch origin c7a1c5087d192932feb271b0d9745ad6653550a3:KOJI_FETCH_HEAD
From https://gitee.com/wenyuzifang/mpich
 * [new ref]         c7a1c5087d192932feb271b0d9745ad6653550a3 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c7a1c50 Update code from upstream