$ git clone -n https://gitee.com/opencloudos-stream/rpm-head-signing.git /var/lib/mock/dist-oc9-epol-build-85151-57435/root/chroot_tmpdir/scmroot/rpm-head-signing
Cloning into '/var/lib/mock/dist-oc9-epol-build-85151-57435/root/chroot_tmpdir/scmroot/rpm-head-signing'...
$ git fetch origin master:KOJI_FETCH_HEAD
From https://gitee.com/opencloudos-stream/rpm-head-signing
 * [new branch]      master     -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ea2c2e7 update