$ git clone -n https://gitee.com/llvm-la/clang.git /var/lib/mock/dist-an23.2-build-400169-72361/root/chroot_tmpdir/scmroot/clang
Cloning into '/var/lib/mock/dist-an23.2-build-400169-72361/root/chroot_tmpdir/scmroot/clang'...
$ git fetch origin 968ceaa87e011482787b8646cdc013c5c569c13b:KOJI_FETCH_HEAD
From https://gitee.com/llvm-la/clang
 * [new ref]         968ceaa87e011482787b8646cdc013c5c569c13b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 968ceaa LoongArch: Backport patches from upstream