$ git clone -n https://gitee.com/opencloudos-stream/clang.git /var/lib/mock/dist-ocs23-riscv-rva23-build-361993-43319/root/chroot_tmpdir/scmroot/clang
Cloning into '/var/lib/mock/dist-ocs23-riscv-rva23-build-361993-43319/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 791d976 Drop GCC-only -Wno-* flags from %build