$ git clone -n https://gitee.com/llvm-la/clang.git /var/lib/mock/dist-an23.2-build-401002-72376/root/chroot_tmpdir/scmroot/clang
Cloning into '/var/lib/mock/dist-an23.2-build-401002-72376/root/chroot_tmpdir/scmroot/clang'...
$ git fetch origin c14439d2f03c9dfae84036df508bec13ef0ac643:KOJI_FETCH_HEAD
From https://gitee.com/llvm-la/clang
 * [new ref]         c14439d2f03c9dfae84036df508bec13ef0ac643 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c14439d [Feature] Backport some patches from upstream on LoongArch