$ git clone -n http://8.131.229.236/anolis-os/grub2 /var/lib/mock/dist-el8-updates-build-16797-2666/root/chroot_tmpdir/scmroot/grub2
Cloning into '/var/lib/mock/dist-el8-updates-build-16797-2666/root/chroot_tmpdir/scmroot/grub2'...
$ git reset --hard origin/a8
HEAD is now at c5b37d8 update to grub2-2.02-87.el8_2.3.src.rpm