name: "CI"

on:
  pull_request:
  push:

permissions: read-all

jobs:

  tests:
    needs: [check_secrets]
    strategy:
      fail-fast: false
      matrix:
        os: [ubuntu-latest, macos-latest]
    runs-on: ${{ matrix.os }}
    timeout-minutes: 60
    steps:
    - uses: actions/checkout@v4
      with:
        fetch-depth: 0
    - uses: cachix/install-nix-action@v30
      with:
        # The sandbox would otherwise be disabled by default on Darwin
        extra_nix_config: "sandbox = true"
    - run: echo CACHIX_NAME="$(echo $GITHUB_REPOSITORY-install-tests | tr "[A-Z]/" "[a-z]-")" >> $GITHUB_ENV
    - uses: cachix/cachix-action@v15
      if: needs.check_secrets.outputs.cachix == 'true'
      with:
        name: '${{ env.CACHIX_NAME }}'
        signingKey: '${{ secrets.CACHIX_SIGNING_KEY }}'
        authToken: '${{ secrets.CACHIX_AUTH_TOKEN }}'
    - if: matrix.os == 'ubuntu-latest'
      run: |
        free -h
        swapon --show
        swap=$(swapon --show --noheadings | head -n 1 | awk '{print $1}')
        echo "Found swap: $swap"
        sudo swapoff $swap
        # resize it (fallocate)
        sudo fallocate -l 10G $swap
        sudo mkswap $swap
        sudo swapon $swap
        free -h
        (
          while sleep 60; do
            free -h
          done
        ) &
    - run: nix --experimental-features 'nix-command flakes' flake check -L
    - run: nix --experimental-features 'nix-command flakes' flake show --all-systems --json

  # Steps to test CI automation in your own fork.
  # Cachix:
  # 1. Sign-up for https://www.cachix.org/
  # 2. Create a cache for $githubuser-nix-install-tests
  # 3. Create a cachix auth token and save it in https://github.com/$githubuser/nix/settings/secrets/actions in "Repository secrets" as CACHIX_AUTH_TOKEN
  # Dockerhub:
  # 1. Sign-up for https://hub.docker.com/
  # 2. Store your dockerhub username as DOCKERHUB_USERNAME in "Repository secrets" of your fork repository settings (https://github.com/$githubuser/nix/settings/secrets/actions)
  # 3. Create an access token in https://hub.docker.com/settings/security and store it as DOCKERHUB_TOKEN in "Repository secrets" of your fork
  check_secrets:
    permissions:
      contents: none
    name: Check Cachix and Docker secrets present for installer tests
    runs-on: ubuntu-latest
    outputs:
      cachix: ${{ steps.secret.outputs.cachix }}
      docker: ${{ steps.secret.outputs.docker }}
    steps:
      - name: Check for secrets
        id: secret
        env:
          _CACHIX_SECRETS: ${{ secrets.CACHIX_SIGNING_KEY }}${{ secrets.CACHIX_AUTH_TOKEN }}
          _DOCKER_SECRETS: ${{ secrets.DOCKERHUB_USERNAME }}${{ secrets.DOCKERHUB_TOKEN }}
        run: |
          echo "::set-output name=cachix::${{ env._CACHIX_SECRETS != '' }}"
          echo "::set-output name=docker::${{ env._DOCKER_SECRETS != '' }}"

  installer:
    needs: [tests, check_secrets]
    if: github.event_name == 'push' && needs.check_secrets.outputs.cachix == 'true'
    runs-on: ubuntu-latest
    outputs:
      installerURL: ${{ steps.prepare-installer.outputs.installerURL }}
    steps:
    - uses: actions/checkout@v4
      with:
        fetch-depth: 0
    - run: echo CACHIX_NAME="$(echo $GITHUB_REPOSITORY-install-tests | tr "[A-Z]/" "[a-z]-")" >> $GITHUB_ENV
    - uses: cachix/install-nix-action@v30
      with:
        install_url: https://releases.nixos.org/nix/nix-2.20.3/install
    - uses: cachix/cachix-action@v15
      with:
        name: '${{ env.CACHIX_NAME }}'
        signingKey: '${{ secrets.CACHIX_SIGNING_KEY }}'
        authToken: '${{ secrets.CACHIX_AUTH_TOKEN }}'
        cachixArgs: '-v'
    - id: prepare-installer
      run: scripts/prepare-installer-for-github-actions

  installer_test:
    needs: [installer, check_secrets]
    if: github.event_name == 'push' && needs.check_secrets.outputs.cachix == 'true'
    strategy:
      fail-fast: false
      matrix:
        os: [ubuntu-latest, macos-latest]
    runs-on: ${{ matrix.os }}
    steps:
    - uses: actions/checkout@v4
    - run: echo CACHIX_NAME="$(echo $GITHUB_REPOSITORY-install-tests | tr "[A-Z]/" "[a-z]-")" >> $GITHUB_ENV
    - uses: cachix/install-nix-action@v30
      with:
        install_url: '${{needs.installer.outputs.installerURL}}'
        install_options: "--tarball-url-prefix https://${{ env.CACHIX_NAME }}.cachix.org/serve"
    - run: sudo apt install fish zsh
      if: matrix.os == 'ubuntu-latest'
    - run: brew install fish
      if: matrix.os == 'macos-latest'
    - run: exec bash -c "nix-instantiate -E 'builtins.currentTime' --eval"
    - run: exec sh -c "nix-instantiate -E 'builtins.currentTime' --eval"
    - run: exec zsh -c "nix-instantiate -E 'builtins.currentTime' --eval"
    - run: exec fish -c "nix-instantiate -E 'builtins.currentTime' --eval"
    - run: exec bash -c "nix-channel --add https://releases.nixos.org/nixos/unstable/nixos-23.05pre466020.60c1d71f2ba nixpkgs"
    - run: exec bash -c "nix-channel --update && nix-env -iA nixpkgs.hello && hello"

  docker_push_image:
    needs: [check_secrets, tests]
    permissions:
      contents: read
      packages: write
    if: >-
      github.event_name == 'push' &&
      github.ref_name == 'master' &&
      needs.check_secrets.outputs.cachix == 'true' &&
      needs.check_secrets.outputs.docker == 'true'
    runs-on: ubuntu-latest
    steps:
    - uses: actions/checkout@v4
      with:
        fetch-depth: 0
    - uses: cachix/install-nix-action@v30
      with:
        install_url: https://releases.nixos.org/nix/nix-2.20.3/install
    - run: echo CACHIX_NAME="$(echo $GITHUB_REPOSITORY-install-tests | tr "[A-Z]/" "[a-z]-")" >> $GITHUB_ENV
    - run: echo NIX_VERSION="$(nix --experimental-features 'nix-command flakes' eval .\#nix.version | tr -d \")" >> $GITHUB_ENV
    - uses: cachix/cachix-action@v15
      if: needs.check_secrets.outputs.cachix == 'true'
      with:
        name: '${{ env.CACHIX_NAME }}'
        signingKey: '${{ secrets.CACHIX_SIGNING_KEY }}'
        authToken: '${{ secrets.CACHIX_AUTH_TOKEN }}'
    - run: nix --experimental-features 'nix-command flakes' build .#dockerImage -L
    - run: docker load -i ./result/image.tar.gz
    - run: docker tag nix:$NIX_VERSION ${{ secrets.DOCKERHUB_USERNAME }}/nix:$NIX_VERSION
    - run: docker tag nix:$NIX_VERSION ${{ secrets.DOCKERHUB_USERNAME }}/nix:master
    # We'll deploy the newly built image to both Docker Hub and Github Container Registry.
    #
    # Push to Docker Hub first
    - name: Login to Docker Hub
      uses: docker/login-action@v3
      with:
        username: ${{ secrets.DOCKERHUB_USERNAME }}
        password: ${{ secrets.DOCKERHUB_TOKEN }}
    - run: docker push ${{ secrets.DOCKERHUB_USERNAME }}/nix:$NIX_VERSION
    - run: docker push ${{ secrets.DOCKERHUB_USERNAME }}/nix:master
    # Push to GitHub Container Registry as well
    - name: Login to GitHub Container Registry
      uses: docker/login-action@v3
      with:
        registry: ghcr.io
        username: ${{ github.actor }}
        password: ${{ secrets.GITHUB_TOKEN }}
    - name: Push image
      run: |
        IMAGE_ID=ghcr.io/${{ github.repository_owner }}/nix
        # Change all uppercase to lowercase
        IMAGE_ID=$(echo $IMAGE_ID | tr '[A-Z]' '[a-z]')

        docker tag nix:$NIX_VERSION $IMAGE_ID:$NIX_VERSION
        docker tag nix:$NIX_VERSION $IMAGE_ID:latest
        docker push $IMAGE_ID:$NIX_VERSION
        docker push $IMAGE_ID:latest
        # deprecated 2024-02-24
        docker tag nix:$NIX_VERSION $IMAGE_ID:master
        docker push $IMAGE_ID:master

  vm_tests:
    runs-on: ubuntu-22.04
    steps:
      - uses: actions/checkout@v4
      - uses: DeterminateSystems/nix-installer-action@main
      - uses: DeterminateSystems/magic-nix-cache-action@main
      - run: nix build -L .#hydraJobs.tests.githubFlakes .#hydraJobs.tests.tarballFlakes .#hydraJobs.tests.functional_user

  flake_regressions:
    needs: vm_tests
    runs-on: ubuntu-22.04
    steps:
      - name: Checkout nix
        uses: actions/checkout@v4
      - name: Checkout flake-regressions
        uses: actions/checkout@v4
        with:
          repository: NixOS/flake-regressions
          path: flake-regressions
      - name: Checkout flake-regressions-data
        uses: actions/checkout@v4
        with:
          repository: NixOS/flake-regressions-data
          path: flake-regressions/tests
      - uses: DeterminateSystems/nix-installer-action@main
      - uses: DeterminateSystems/magic-nix-cache-action@main
      - run: nix build --out-link ./new-nix && PATH=$(pwd)/new-nix/bin:$PATH scripts/flake-regressions.sh