$ git clone -n https://gitee.com/idolsama/grub2.git /var/lib/mock/dist-an23-build-337372-69705/root/chroot_tmpdir/scmroot/grub2
Cloning into '/var/lib/mock/dist-an23-build-337372-69705/root/chroot_tmpdir/scmroot/grub2'...
$ git fetch origin e5570345e24fbd43e466aede27531671eca6a170:KOJI_FETCH_HEAD
From https://gitee.com/idolsama/grub2
 * [new ref]         e5570345e24fbd43e466aede27531671eca6a170 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e557034 Add riscv64 support