$ git clone -n https://gitee.com/opencloudos-stream/llvm.git /var/lib/mock/dist-ocs23-riscv-rva23-build-359837-42116/root/chroot_tmpdir/scmroot/llvm
Cloning into '/var/lib/mock/dist-ocs23-riscv-rva23-build-359837-42116/root/chroot_tmpdir/scmroot/llvm'...
$ git fetch origin rva23:KOJI_FETCH_HEAD
From https://gitee.com/opencloudos-stream/llvm
 * [new branch]      rva23      -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b4df003 riscv Update to 20.1.8