$ git clone -n https://gitee.com/llvm-la/clang.git /var/lib/mock/dist-an23.2-build-402437-72394/root/chroot_tmpdir/scmroot/clang
Cloning into '/var/lib/mock/dist-an23.2-build-402437-72394/root/chroot_tmpdir/scmroot/clang'...
$ git fetch origin 42cea66124bf8178d9ce6e28c515b2bf94043faa:KOJI_FETCH_HEAD
From https://gitee.com/llvm-la/clang
 * [new ref]         42cea66124bf8178d9ce6e28c515b2bf94043faa -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 42cea66 [Feature] Backport some patches from upstream on LoongArch