when used with a docker call how do i get the stats out to the action?

[altendky]

Thanks for this action, it has sped up my builds by about 6x to get down to 10 minutes which is wonderful. I am setting up builds using QEMU for RISCV in Docker. I was able to propagate the environment variables and the cache directory into the container but I am not sure what to propagate back out so that the post run step is able to show the statistics about cache hits etc.

https://github.com/Chia-Network/build-wheels/actions/runs/8157450783/job/22297172636?pr=30#step:21:1

Post job cleanup.
/opt/hostedtoolcache/sccache/0.7.7/x64/sccache --show-stats
Compile requests                      0
Compile requests executed             0
Cache hits                            0
Cache misses                          0
Cache timeouts                        0
Cache read errors                     0
Forced recaches                       0
Cache write errors                    0
Compilation failures                  0
Cache errors                          0
Non-cacheable compilations            0
Non-cacheable calls                   0
Non-compilation calls                 0
Unsupported compiler calls            0
Average cache write               0.000 s
Average compiler                  0.000 s
Average cache read hit            0.000 s
Failed distributed compilations       0
Cache location                  Local disk: "/home/runner/.cache/sccache"
Use direct/preprocessor mode?   yes
Version (client)                0.[7](https://github.com/Chia-Network/build-wheels/actions/runs/8157450783/job/22297172636?pr=30#step:21:7).7
Max cache size                       [10](https://github.com/Chia-Network/build-wheels/actions/runs/8157450783/job/22297172636?pr=30#step:21:10) GiB

https://github.com/Chia-Network/build-wheels/actions/runs/8157450783/workflow?pr=30#L100

      - name: Run sccache-cache
        uses: mozilla-actions/sccache-action@v0.0.3

      - name: Set up QEMU on x86_64
        if: matrix.arch.matrix == 'risc'
        id: qemu
        uses: docker/setup-qemu-action@v3
        with:
          platforms: riscv64
      
      - name: Build wheel
        run: |
          docker run --rm --platform linux/riscv64 \
          -v ${{ github.workspace }}:/ws \
          -v "${SCCACHE_PATH}":/sccache \
          -e SCCACHE_PATH="/sccache" \
          -e SCCACHE_GHA_ENABLED=true \
          -e ACTIONS_CACHE_URL="${ACTIONS_CACHE_URL}" \
          -e ACTIONS_RUNTIME_TOKEN="${ACTIONS_RUNTIME_TOKEN}" \
          -e RUSTC_WRAPPER=sccache \
          --workdir=/ws \
          chianetwork/ubuntu-22.04-risc-builder:latest \
          bash -exc '\
          pyenv global ${{ matrix.python.matrix }} && \
          python3 -m venv venv && \
          source ./venv/bin/activate && \
          pip install --upgrade pip && \
          pip wheel -w dist ./source \

[altendky]

I'll leave this open since someone else may understand better and be able to confidently say this "can't be fixed" or whatever.

Looking around, it appears that the stats come from a running sccache server process which would have existed only inside the docket docker container. I'll dump the stats manually within the docker container for now so I can see them.

[Alex-PLACET]

You can't do that.
For my qemu builds I use uraimo/run-on-arch-action, actions/cache@v4 and install ccache in the docker container.
You can check this file for example: https://github.com/man-group/sparrow/blob/d18b99bfc067a812824156c7002797e4f50b3e54/.github/workflows/qemu.yaml