holonix-cache.yaml

name: "Holonix cache"

on:
  # Assume pushes to these branches imply changes that should be cached. If not then the workflow run will be
  # idempotent, so it won't do any harm.
  push:
    branches:
      - main
      - main-0.4
      - main-0.3
  workflow_call:
    inputs:
      branch:
        required: true
        type: string
  # Allow the cache update to be run manually.
  workflow_dispatch:
    inputs:
      branch:
        description: "The branch to update the cache for"
        required: true
        default: "main"
        type: choice
        options:
          - main
          - main-0.4
          - main-0.3

concurrency:
  group: ${{ github.workflow }}-${{ inputs.branch }}-${{ github.ref_name }}
  cancel-in-progress: true

jobs:
  # ensures the cache is regularly updated for the supported versions on multiple platforms
  cache-update:
    strategy:
      fail-fast: false
      matrix:
        os: [ ubuntu-latest, macos-latest, macos-13 ]

    runs-on: ${{ matrix.os }}

    steps:
      - uses: cachix/install-nix-action@v30
        with:
          install_url: https://releases.nixos.org/nix/nix-2.24.9/install
          extra_nix_config: |
            accept-flake-config = true
      - uses: cachix/cachix-action@v15
        with:
          name: holochain-ci
          authToken: ${{ secrets.CACHIX_AUTH_TOKEN }}
      - name: Maximize build space (Linux)
        if: runner.os == 'Linux'
        uses: AdityaGarg8/remove-unwanted-software@v4
        with:
          remove-dotnet: 'true'
          remove-android: 'true'
          remove-codeql: 'true'
          remove-docker-images: 'true'
      - name: Maximise build space (Mac OS)
        if: runner.os == 'macOS'
        run: |
          sudo rm -rf /usr/share/dotnet
          sudo rm -rf /opt/ghc
          sudo rm -rf "/usr/local/share/boost"
          sudo rm -rf "$AGENT_TOOLSDIRECTORY"
      - name: Check disk space before
        run: df -h /
      - name: Extract branch name
        id: select_branch
        shell: bash
        run: |
          # Figure out what branch was used to trigger the workflow (i.e. the `push` trigger)
          changed_branch=${GITHUB_HEAD_REF:-${GITHUB_REF#refs/heads/}}
          
          # Get the input branch override if it exists. This will be set if the workflow is triggered manually or by a
          # workflow call.
          input_branch='${{ inputs.branch }}'
          
          # Pick a branch to work with, preferring the input branch if it exists.
          echo "branch=${input_branch:-$changed_branch}" >> $GITHUB_OUTPUT

      - name: Cache default Holonix flake on [${{ steps.select_branch.outputs.branch }}]
        env:
          # NIX_CONFIG: "access-tokens = github.com=${{ secrets.GITHUB_TOKEN }}"
          CACHIX_AUTH_TOKEN: "${{ secrets.CACHIX_AUTH_TOKEN }}"
        run: |
          # See https://docs.cachix.org/pushing#id1
          nix develop --build -L --profile result-develop "github:holochain/holonix?ref=${{ steps.select_branch.outputs.branch }}"

          # Push both results to the cache
          for i in result-*; do
            cachix push holochain-ci $i
          done
    outputs:
      branch: ${{ steps.select_branch.outputs.branch }}

  cache-check:
    needs:
      - cache-update
    strategy:
      fail-fast: false
      matrix:
        os: [ ubuntu-latest, macos-latest, macos-13 ]
        include:
          - os: ubuntu-latest
            platform: x86_64-linux
          - os: macos-latest
            platform: aarch64-darwin
          - os: macos-13
            platform: x86_64-darwin
    runs-on: ubuntu-latest
    steps:
      - uses: cachix/install-nix-action@v30
        with:
          install_url: https://releases.nixos.org/nix/nix-2.24.9/install
          extra_nix_config: |
            accept-flake-config = true
      - uses: cachix/cachix-action@v15
        with:
          name: holochain-ci
      - name: Check the Holonix cache
        uses: holochain/nix-cache-check@v1
        # env:
        #  NIX_CONFIG: "access-tokens = github.com=${{ secrets.GITHUB_TOKEN }}"
        with:
          # The default shell in the Holonix flake
          derivation: "github:holochain/holonix?ref=${{ needs.cache-update.outputs.branch }}#devShells.${{ matrix.platform }}.default"