wip

.github/actions/mounts/action.yml

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+name: Mount dependencies
+description: Mount dependencies
+inputs:
+  name:
+    description: task name
+    required: true
+runs:
+  using: "composite"
+  steps:
+    - name: Compute dependencies
+      id: dependencies
+      shell: bash
+      run: |
+        python3 CI/run.py --mounts "${{ inputs.name }}" >> $GITHUB_OUTPUT
+    - uses: actions/setup-node@v3
+      if: ${{ steps.dependencies.outputs.data }}
+      with:
+        node-version: '20.x'
+    - shell: bash
+      if: ${{ steps.dependencies.outputs.data }}
+      run: npm install @actions/cache
+    - name: Mount dependencies
+      if: ${{ steps.dependencies.outputs.data }}
+      uses: actions/github-script@v7
+      with:
+        script: |
+          const fs = require('fs');
+          const path = require('path');
+          const cache = require('@actions/cache');
+          const data = ${{ toJSON(fromJSON(steps.dependencies.outputs.data)) }};
+          // Make actions/cache's getWorkingDirectory() return process.cwd.
+          delete process.env.GITHUB_WORKSPACE;
+          for (const mount of data) {
+            const dir = path.join('cache', mount.key, path.dirname(mount.artifact));
+            fs.mkdirSync(dir, { recursive: true });
+            process.chdir(dir);
+            if (await cache.restoreCache([path.basename(mount.artifact)], mount.key, [], {}, true)) {
+              console.log(`Cache restored from key: ${mount.key}`);
+            } else {
+              core.setFailed(`Failed to restore cache from key: ${mount.key}`);
+            }
+          }

.github/actions/task/action.yml

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+name: Task
+description: Run task
+inputs:
+  name:
+    description: task name
+    required: true
+runs:
+  using: "composite"
+  steps:
+    - uses: actions/setup-python@v5
+      if: ${{ runner.os == 'macOS' }}
+      with:
+        python-version: ${{ runner.arch == 'ARM64' && '3.11.7' || '3.9.14' }}
+    - name: Finish python setup
+      if: ${{ runner.os == 'macOS' }}
+      shell: bash
+      run: |
+        python3 -m pip install pip==20.3.4 wheel==0.37.0 --upgrade
+    - name: Artifact
+      id: artifact
+      shell: bash
+      run: |
+        python3 CI/run.py --artifacts "${{ inputs.name }}" >> $GITHUB_OUTPUT
+    - uses: actions/cache@v4
+      id: cache
+      with:
+        path: ${{ join(fromJSON(steps.artifact.outputs.path), '\n') }}
+        key: ${{ steps.artifact.outputs.key }}
+        enableCrossOsArchive: true
+    - uses: ./.github/actions/mounts
+      if: ${{ steps.cache.outputs.cache-hit != 'true' }}
+      with:
+        name: ${{ inputs.name }}
+    - name: ${{ inputs.name }}
+      shell: bash
+      if: ${{ steps.cache.outputs.cache-hit != 'true' }}
+      run: | 
+        python3 CI/run.py --cache cache --no-recurse --out . "${{ inputs.name }}"

.github/workflows/env-tools.yml

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+# TODO: https://stackoverflow.com/questions/59180385/using-an-array-of-values-to-repeat-a-step-in-github-actions-workflow
+name: environment and tools
+on: [push]
+jobs:
+  docker-base:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - run: |
+          cat <<'EOF'
+          ${{ toJSON(github) }}
+          EOF
+      - uses: ./.github/actions/task
+        with:
+          name: "docker image: base"
+
+  docker:
+    needs: docker-base
+    strategy:
+      fail-fast: false
+      matrix:
+        image:
+          - build
+          - build-tools
+          - test
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: ./.github/actions/task
+        with:
+          name: "docker image: ${{ matrix.image }}"
+
+  msys-base:
+    runs-on: ubuntu-latest
+    needs: docker-base
+    steps:
+      - uses: actions/checkout@v4
+      - uses: ./.github/actions/task
+        with:
+          name: "msys2 image: base x86_64"
+
+  msys:
+    strategy:
+      fail-fast: false
+      matrix:
+        image:
+          - build
+          - test
+    runs-on: windows-latest
+    needs: msys-base
+    steps:
+      - uses: actions/checkout@v4
+      - uses: ./.github/actions/task
+        with:
+          name: "msys2 image: ${{ matrix.image }} x86_64"
+
+  git:
+    strategy:
+      fail-fast: false
+      matrix:
+        version:
+          - 1.8.5
+          - 2.7.4
+          - 2.47.1
+          - 2.47.1.windows.1 windows x86_64
+    runs-on: ubuntu-latest
+    needs: docker
+    steps:
+      - uses: actions/checkout@v4
+      - uses: ./.github/actions/task
+        with:
+          name: git v${{ matrix.version }}
+
+  mercurial:
+    strategy:
+      fail-fast: false
+      matrix:
+        runner: [ubuntu-latest]
+        version:
+          - 1.9.3
+          - 2.5.4
+          - 3.4.2
+          - 6.8
+        include:
+          - runner: windows-latest
+            version: 6.8 windows x86_64
+          - runner: macos-13
+            version: 6.8 macos x86_64
+          - runner: macos-14
+            version: 6.8 macos arm64
+    runs-on: ${{ matrix.runner }}
+    needs: [docker, msys]
+    steps:
+      - uses: actions/checkout@v4
+      - run: env
+      - uses: ./.github/actions/task
+        with:
+          name: hg v${{ matrix.version }}
+
+  git-cinnabar:
+    strategy:
+      fail-fast: false
+      matrix:
+        runner: [ubuntu-latest]
+        type:
+          - linux arm64
+          - linux x86_64
+          - linux x86_64 asan
+          - linux x86_64 coverage
+          - windows x86_64
+        include:
+          - runner: macos-13
+            type: macos x86_64
+          - runner: macos-14
+            type: macos arm64
+    runs-on: ${{ matrix.runner }}
+    needs: docker
+    steps:
+      - uses: actions/checkout@v4
+      - run: env
+      - uses: ./.github/actions/task
+        with:
+          name: build ${{ matrix.type }}