$ git clone -n https://gitee.com/opencloudos-stream/smatch.git /var/lib/mock/dist-rebuild-after-rpm-check-build-170529-10506/root/chroot_tmpdir/scmroot/smatch
Cloning into '/var/lib/mock/dist-rebuild-after-rpm-check-build-170529-10506/root/chroot_tmpdir/scmroot/smatch'...
$ git fetch origin master:KOJI_FETCH_HEAD
From https://gitee.com/opencloudos-stream/smatch
 * [new branch]      master     -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5150f70 update