$ git clone -n https://gitee.com/opencloudos-stream/clang.git /var/lib/mock/dist-ocs23-riscv-rva23-build-361054-42877/root/chroot_tmpdir/scmroot/clang
Cloning into '/var/lib/mock/dist-ocs23-riscv-rva23-build-361054-42877/root/chroot_tmpdir/scmroot/clang'...
$ git fetch origin rva23:KOJI_FETCH_HEAD
From https://gitee.com/opencloudos-stream/clang
 * [new branch]      rva23      -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 17ac232 clang: update sources for 20.1.8 tarballs