`cachedMake` retrieving incomplete files?

[Zimmi48]

In https://github.com/coq-community/hydra-battles/runs/4054266890?check_suite_focus=true, we got an error of the following form while building a coqdoc target:

/home/runner/work/hydra-battles/hydra-battles/theories/ordinals/Ackermann/wellFormed.vo: premature end of file. Try to rebuild it.

In principle, the file should have been built in a previous job (hydra-battles-single) and retrieved with cachedMake.

Is this possible that this retrieval step led to an incomplete file?

Restarting the job made it pass.

[CohenCyril]

What does this have to do with cachedMake? I do not see a call to it and it is not used in the toolbox generated CI.

[Zimmi48]

This build-doc step is manually implemented (and inserted in the generated CI configuration). It does the following:

  build-doc:
    needs:
    - hydra-battles-single
    runs-on: ubuntu-latest
    steps:
    - name: Determine which commit to test
      run: "if [ ${{ github.event_name }} = \"push\" ]; then\n  echo \"tested_commit=${{\
        \ github.sha }}\" >> $GITHUB_ENV\nelse\n  merge_commit=$(git ls-remote ${{\
        \ github.event.repository.html_url }} refs/pull/${{ github.event.number }}/merge\
        \ | cut -f1)\n  if [ -z \"$merge_commit\" ]; then\n    echo \"tested_commit=${{\
        \ github.event.pull_request.head.sha }}\" >> $GITHUB_ENV\n  else\n    echo\
        \ \"tested_commit=$merge_commit\" >> $GITHUB_ENV\n  fi\nfi\n"
    - name: Git checkout
      uses: actions/checkout@v2
      with:
        fetch-depth: 0
        ref: ${{ env.tested_commit }}
    - name: Cachix install
      uses: cachix/install-nix-action@v14
      with:
        nix_path: nixpkgs=channel:nixpkgs-unstable
    - name: Cachix setup coq
      uses: cachix/cachix-action@v10
      with:
        name: coq
    - name: Cachix setup coq-community
      uses: cachix/cachix-action@v10
      with:
        authToken: ${{ secrets.CACHIX_AUTH_TOKEN }}
        name: coq-community
    - name: Cachix setup math-comp
      uses: cachix/cachix-action@v10
      with:
        name: math-comp
    - name: Retrieve prebuilt vo files
      run: |
        nix-shell --run "make Makefile.coq"
        nix-shell --run "cachedMake"
        nix-shell --run "make -t"
    - name: Build Alectryon snippets
      run: nix-shell --run "make -C doc/movies -j $(nproc) all"
    - name: Build coqdoc
      run: nix-shell --run "make -j $(nproc) html"
    - name: Compile LaTeX document
      run: nix-shell --run "make pdf SOURCE_DATE_EPOCH=$(date +%s)"
    - name: Extract PDF and Coqdoc
      run: |
        mkdir -p public/doc public/theories
        cp doc/hydras.pdf public/doc/
        cp -r theories/html public/theories/
    # Depending on whether we are on master or not, we deploy to
    # GitHub Pages or as an artifact
    - name: Deploy to GitHub pages
      if: github.event_name == 'push' && github.ref == 'refs/heads/master'
      uses: crazy-max/ghaction-github-pages@v2
      with:
        build_dir: public
        jekyll: false
      env:
        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
    - name: Deploy artifact
      if: github.event_name != 'push' || github.ref != 'refs/heads/master'
      uses: actions/upload-artifact@v2
      with:
        path: public

Notice that the step "Retrieve prebuilt vo files" calls cachedMake to retrieve prebuilt vo files.