$ git clone -n https://gitee.com/src-opencloudos-rpms/grub2.git /var/lib/mock/dist-oc9-build-73124-48655/root/chroot_tmpdir/scmroot/grub2
Cloning into '/var/lib/mock/dist-oc9-build-73124-48655/root/chroot_tmpdir/scmroot/grub2'...
$ git fetch origin 0879c50e7848a14a2a1a550bab089507375d0855:KOJI_FETCH_HEAD
From https://gitee.com/src-opencloudos-rpms/grub2
 * [new ref]         0879c50e7848a14a2a1a550bab089507375d0855 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0879c50 import grub2-2.12-1.tl4