$ git clone -n https://gitee.com/idolsama/grub2.git /var/lib/mock/dist-an23-build-337425-69707/root/chroot_tmpdir/scmroot/grub2
Cloning into '/var/lib/mock/dist-an23-build-337425-69707/root/chroot_tmpdir/scmroot/grub2'...
$ git fetch origin 39d96c27d2ffdf6bb62e6e9bfb91860c6f703b5f:KOJI_FETCH_HEAD
From https://gitee.com/idolsama/grub2
 * [new ref]         39d96c27d2ffdf6bb62e6e9bfb91860c6f703b5f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 39d96c2 Add riscv64 support