action.yml

name: "Setup nix"
inputs:
  setup-magic-nix-cache:
    description: "whether to set up magic-nix-cache"
    default: true
    required: false
    type: boolean
  setup-cachix:
    description: "whether to set up cachix"
    default: true
    required: false
    type: boolean
  cachix-push-filter:
    description: "push filter for cachix (fitler out upload for those outputs)"
    required: false
    type: string
  cachix-name:
    description: "cachix name"
    required: false
    type: string
  free-disk-space:
    description: "whether to free disk space"
    default: false
    required: false
    type: boolean
  setup-qemu:
    description: "whether to set up qemu"
    default: true
    required: false
    type: boolean
  system-features:
    description: "list of system features to enable (strings separated by ,)"
    required: false
    type: string
  extra-platforms:
    description: "list of extra platforms to enable (strings separated by ,)"
    required: false
    type: string
  nix-systems:
    description: "DEPRECATED use extra-platforms, list of extra platforms to enable (strings separated by ,)"
    required: false
    type: string
  cachix-auth-token:
    description: "auth token for cachix"
    required: false
    type: string

runs:
  using: "composite"
  steps:
    - name: Install nix
      uses: cachix/install-nix-action@v26
      with:
        extra_nix_config: |
          experimental-features = nix-command flakes
          access-tokens = github.com=${{ github.token }}
          substituters = https://cache.nixos.org
          trusted-public-keys = cache.nixos.org-1:6NCHdD59X431o0gWypbMrAURkbJ16ZPMQFGspcDShjY=

    - name: Setup magic-nix-cache
      if: format('{0}', inputs.setup-cachix) == 'true'
      uses: DeterminateSystems/magic-nix-cache-action@v2
      with:
        diagnostic-endpoint: ""

    - name: Setup cachix
      # What the fuck is this shit? See https://github.com/actions/runner/issues/1483
      if: format('{0}', inputs.setup-cachix) == 'true'
      uses: cachix/cachix-action@v13
      with:
        name: ${{ inputs.cachix-name == '' && github.repository_owner || inputs.cachix-name }}
        pushFilter: ${{ inputs.cachix-push-filter }}
        authToken: ${{ inputs.cachix-auth-token }}

    - name: Change nix configuration
      shell: bash
      run: |
        mkdir -p ~/.config/nix/

        cat <<EOF | tee -a ~/.config/nix/nix.conf
        sandbox = false
        EOF

        declare -a extra_platforms=($(echo "${{ inputs.extra-platforms }}" | tr ',' '\n' | xargs))
        extra_platforms+=($(echo "${{ inputs.nix-systems }}" | tr ',' '\n' | xargs))
        if (( ${#extra_platforms[@]} )); then
          cat <<EOF | tee -a ~/.config/nix/nix.conf
          extra-platforms = ${extra_platforms[*]}
        EOF
        fi

        declare -a system_features=($(echo "${{ inputs.system-features }}" | tr ',' '\n' | xargs))
        if (( ${#system_features[@]} )); then
          cat <<EOF | tee -a ~/.config/nix/nix.conf
          system-features = ${system_features[*]}
        EOF
        fi

    # https://github.com/actions/virtual-environments/issues/2840#issuecomment-790492173
    # https://github.com/actions/virtual-environments/issues/709
    - name: Free some disk space
      if: format('{0}', inputs.free-disk-space) == 'true' && runner.os == 'Linux'
      shell: bash
      run: |
        set +e
        echo "=============================================================================="
        echo "Listing 100 largest packages"
        echo "=============================================================================="
        dpkg-query -Wf '${Installed-Size}\t${Package}\n' | sort -n | tail -n 100
        echo "=============================================================================="
        echo "Removing large packages"
        echo "=============================================================================="
        sudo snap remove chromium
        sudo snap remove gnome
        sudo snap remove lxd
        sudo apt-get remove -y '^ghc-.*'
        sudo apt-get remove -y '^adoptopenjdk-.*'
        sudo apt-get remove -y '^dotnet-.*'
        sudo apt-get remove -y '^llvm-.*'
        sudo apt-get remove -y 'libllvm.*'
        sudo apt-get remove -y 'libclang.*'
        sudo apt-get remove -y 'php.*'
        sudo apt-get remove -y '^mysql-server.*'
        sudo apt-get remove -y '^mongodb.*'
        sudo apt-get remove -y azure-cli
        sudo apt-get remove -y google-cloud-sdk
        sudo apt-get remove -y hhvm
        sudo apt-get remove -y google-chrome-stable
        sudo apt-get remove -y firefox
        sudo apt-get remove -y libgl1-mesa-dri
        sudo apt-get remove -y powershell
        sudo apt-get remove -y snapd
        sudo apt-get clean
        echo "=============================================================================="
        echo "Removing large directories"
        echo "=============================================================================="
        sudo rm -rf /usr/share/dotnet
        sudo rm -rf /opt/ghc
        sudo rm -rf "/usr/local/share/boost"
        sudo rm -rf /root/.nuget
        sudo rm -rf "$AGENT_TOOLSDIRECTORY"
        sudo rm -rf /usr/local/lib/android
        sudo rm -rf /usr/share/rust
        sudo rm -rf /usr/share/swift
        sudo rm -rf /var/lib/snapd
        sudo rm -rf /usr/local/graalvm
        sudo rm -rf /home/linuxbrew/.linuxbrew
        sudo rm -rf /usr/local/.ghcup/ghc
        echo "=============================================================================="
        echo "Showing disk usage"
        echo "=============================================================================="
        df -h

    # github actions does not support virtualization yet https://github.com/actions/virtual-environments/issues/183
    - name: Install qemu
      if: format('{0}', inputs.setup-qemu) == 'true' && runner.os == 'Linux'
      uses: docker/setup-qemu-action@v3