$ git clone -n https://gitee.com/src-opencloudos-rpms/grub2.git /var/lib/mock/dist-oc9-build-246359-83462/root/chroot_tmpdir/scmroot/grub2
Cloning into '/var/lib/mock/dist-oc9-build-246359-83462/root/chroot_tmpdir/scmroot/grub2'...
$ git fetch origin 8b8deb03f721eada7ba2590de9c48d1bbb5e6b75:KOJI_FETCH_HEAD
From https://gitee.com/src-opencloudos-rpms/grub2
 * [new ref]         8b8deb03f721eada7ba2590de9c48d1bbb5e6b75 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8b8deb0 import grub2-2.12-20.tl4.ap.2