$ git clone -n https://gitee.com/jessica-liu/grub2_new.git /var/lib/mock/dist-an23-build-468098-74027/root/chroot_tmpdir/scmroot/grub2_new
Cloning into '/var/lib/mock/dist-an23-build-468098-74027/root/chroot_tmpdir/scmroot/grub2_new'...
$ git fetch origin ed142bfbc1689aff6709b0f5c7dbf9b5ca29d57b:KOJI_FETCH_HEAD
From https://gitee.com/jessica-liu/grub2_new
 * [new ref]         ed142bfbc1689aff6709b0f5c7dbf9b5ca29d57b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ed142bf Use time register in grub_efi_get_time_ms()