$ git clone -n https://gitee.com/llvm-la/clang.git /var/lib/mock/dist-an23.2-build-402491-72394/root/chroot_tmpdir/scmroot/clang
Cloning into '/var/lib/mock/dist-an23.2-build-402491-72394/root/chroot_tmpdir/scmroot/clang'...
$ git fetch origin f50470da8f6909589e2c0c4001c3c0adeacf36c0:KOJI_FETCH_HEAD
From https://gitee.com/llvm-la/clang
 * [new ref]         f50470da8f6909589e2c0c4001c3c0adeacf36c0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f50470d [Feature] Backport some patches from upstream on LoongArch