$ git clone -n https://gitee.com/gcdota930915/grub2.git /var/lib/mock/dist-an23-build-550042-88793/root/chroot_tmpdir/scmroot/grub2
Cloning into '/var/lib/mock/dist-an23-build-550042-88793/root/chroot_tmpdir/scmroot/grub2'...
$ git fetch origin 511d03c521c691f9f5e595b3e7749feef77022f6:KOJI_FETCH_HEAD
From https://gitee.com/gcdota930915/grub2
 * [new ref]         511d03c521c691f9f5e595b3e7749feef77022f6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 511d03c debug: limit diagnostic build to x86_64