$ git clone -n https://gitee.com/src-opencloudos-rpms/grub2.git /var/lib/mock/dist-oc9-build-124778-74413/root/chroot_tmpdir/scmroot/grub2
Cloning into '/var/lib/mock/dist-oc9-build-124778-74413/root/chroot_tmpdir/scmroot/grub2'...
$ git fetch origin ac1a14a2d391200c0b1430d930f46f7daf476b65:KOJI_FETCH_HEAD
From https://gitee.com/src-opencloudos-rpms/grub2
 * [new ref]         ac1a14a2d391200c0b1430d930f46f7daf476b65 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ac1a14a import grub2-2.12-12.tl4