$ git clone -n https://gitee.com/zhonglingh/grub2.git /var/lib/mock/dist-lifsea8-build-80749-41057/root/chroot_tmpdir/scmroot/grub2
Cloning into '/var/lib/mock/dist-lifsea8-build-80749-41057/root/chroot_tmpdir/scmroot/grub2'...
$ git reset --hard origin/a8
HEAD is now at b38264b Fix a bug in bls_make_list, blscfg.