$ git clone -n https://gitee.com/opencloudos-stream/pkgtreediff.git /var/lib/mock/dist-oc9-epol-build-227428-81157/root/chroot_tmpdir/scmroot/pkgtreediff
Cloning into '/var/lib/mock/dist-oc9-epol-build-227428-81157/root/chroot_tmpdir/scmroot/pkgtreediff'...
$ git fetch origin master:KOJI_FETCH_HEAD
From https://gitee.com/opencloudos-stream/pkgtreediff
 * [new branch]      master     -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at eef5fe4 !2 fix %install error Merge pull request !2 from epol/master