$ git clone -n https://gitee.com/src-opencloudos-rpms/grub2.git /var/lib/mock/dist-oc8-build-74261-49862/root/chroot_tmpdir/scmroot/grub2
Cloning into '/var/lib/mock/dist-oc8-build-74261-49862/root/chroot_tmpdir/scmroot/grub2'...
$ git fetch origin 6b5445ace59922aac761af7dc1b55fd0c5e9acd2:KOJI_FETCH_HEAD
From https://gitee.com/src-opencloudos-rpms/grub2
 * [new ref]         6b5445ace59922aac761af7dc1b55fd0c5e9acd2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6b5445a import grub2-2.02-156.tl3.1