$ git clone -n https://gitee.com/opencloudos-stream/squirrel.git /var/lib/mock/dist-oc9-epol-build-80463-53690/root/chroot_tmpdir/scmroot/squirrel
Cloning into '/var/lib/mock/dist-oc9-epol-build-80463-53690/root/chroot_tmpdir/scmroot/squirrel'...
$ git fetch origin master:KOJI_FETCH_HEAD
From https://gitee.com/opencloudos-stream/squirrel
 * [new branch]      master     -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2f91850 update