$ git clone -n https://gitee.com/opencloudos-stream/bomber.git /var/lib/mock/dist-oc9-epol-build-101288-65793/root/chroot_tmpdir/scmroot/bomber
Cloning into '/var/lib/mock/dist-oc9-epol-build-101288-65793/root/chroot_tmpdir/scmroot/bomber'...
$ git fetch origin master:KOJI_FETCH_HEAD
From https://gitee.com/opencloudos-stream/bomber
 * [new branch]      master     -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6d4f828 update