$ git clone -n https://gitee.com/src-opencloudos-rpms/clang /var/lib/mock/dist-oc9-build-66851-17298/root/chroot_tmpdir/scmroot/clang
Cloning into '/var/lib/mock/dist-oc9-build-66851-17298/root/chroot_tmpdir/scmroot/clang'...
$ git fetch origin oc9:KOJI_FETCH_HEAD
From https://gitee.com/src-opencloudos-rpms/clang
 * [new branch]      oc9        -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c7e934e debranf for opencloudos