$ git clone -n https://gitee.com/opencloudos-stream/system-gnat-project-common.git /var/lib/mock/dist-oc9-epol-build-106831-66900/root/chroot_tmpdir/scmroot/system-gnat-project-common
Cloning into '/var/lib/mock/dist-oc9-epol-build-106831-66900/root/chroot_tmpdir/scmroot/system-gnat-project-common'...
$ git fetch origin master:KOJI_FETCH_HEAD
From https://gitee.com/opencloudos-stream/system-gnat-project-common
 * [new branch]      master     -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9ed31bf update