$ git clone -n https://gitee.com/mgb01105731/grub2_7.git /var/lib/mock/dist-an23-build-373544-71458/root/chroot_tmpdir/scmroot/grub2_7
Cloning into '/var/lib/mock/dist-an23-build-373544-71458/root/chroot_tmpdir/scmroot/grub2_7'...
$ git fetch origin a23.0:KOJI_FETCH_HEAD
From https://gitee.com/mgb01105731/grub2_7
 * [new branch]      a23.0      -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at dfcfa23 update to 2.12