$ git clone -n https://gitee.com/llvm-la/clang.git /var/lib/mock/dist-an23.2-build-401162-72376/root/chroot_tmpdir/scmroot/clang
Cloning into '/var/lib/mock/dist-an23.2-build-401162-72376/root/chroot_tmpdir/scmroot/clang'...
$ git fetch origin b9b0d212226e5f07189fbf50eceb783a068d2c95:KOJI_FETCH_HEAD
From https://gitee.com/llvm-la/clang
 * [new ref]         b9b0d212226e5f07189fbf50eceb783a068d2c95 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b9b0d21 [Feature] Backport some patches from upstream on LoongArch