$ git clone -n https://gitee.com/src-anolis-os/grub2.git /var/lib/mock/dist-an23.6-build-548655-87924/root/chroot_tmpdir/scmroot/grub2
Cloning into '/var/lib/mock/dist-an23.6-build-548655-87924/root/chroot_tmpdir/scmroot/grub2'...
$ git fetch origin a23:KOJI_FETCH_HEAD
From https://gitee.com/src-anolis-os/grub2
 * [new branch]      a23        -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 70b833b Backport upstream 569214e2: fix GRUB ext2 driver misreading ext4 external extent tree (>4 extents)