name: Update flake
on:
  schedule:
    - cron: "35 4 * * *"
  workflow_dispatch: {}
jobs:
  update-flake:
    name: Update flake
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v3
        with:
          token: ${{ secrets.PUBLISH_TOKEN }}
      - uses: cachix/install-nix-action@v17
        with:
          extra_nix_config: |
            substituters = https://f000.backblazeb2.com/file/cache-chir-rs/ https://cache.nixos.org/
            trusted-public-keys = nixcache:8KKuGz95Pk4UJ5W/Ni+pN+v+LDTkMMFV4yrGmAYgkDg= hydra.nixos.org-1:CNHJZBh9K4tP3EKF6FkkgeVYsS3ohTl+oS0Qa8bezVs=
      # instantiate the current derivations
      - id: update-step
        run: |
          for job in nixos-8gb-fsn1-1 nutty-noon thinkrac installer nas; do
            nix show-derivation -r ".#hydraJobs.$job.x86_64-linux" > old-$job.json
          done

          nix flake update

          for job in nixos-8gb-fsn1-1 nutty-noon thinkrac installer nas; do
            nix show-derivation -r ".#hydraJobs.$job.x86_64-linux" > new-$job.json

            python scripts/diff-drvs.py old-$job.json new-$job.json > report-$job.txt
            cat report-$job.txt >> full-report.txt
          done

          if [ -s full-report.txt ]; then
            echo "Automatic flake.lock update" > pr-message.txt
            echo "" >> pr-message.txt
            for job in nixos-8gb-fsn1-1 nutty-noon thinkrac installer nas; do
              echo "## Changes for $job:" >> pr-message.txt
              echo '```' >> pr-message.txt
              cat report-$job.txt >> pr-message.txt
              echo '```' >> pr-message.txt
            done
          else
            touch pr-message.txt
          fi

          body=$(cat pr-message.txt)
          body="${body//'%'/'%25'}"
          body="${body//$'\n'/'%0A'}"
          body="${body//$'\r'/'%0D'}"
          echo ::set-output name=body::$body
      - uses: peter-evans/create-pull-request@v4
        if: steps.update-step.outputs.body != ''
        with:
          token: ${{ secrets.PUBLISH_TOKEN }}
          body: ${{ steps.update-step.outputs.body }}
          commit-message: Update flake.lock
          committer: GitHub <noreply@github.com>
          author: github-actions[bot] <github-actions[bot]@users.noreply.github.com>
          branch: update-flake
          delete-branch: true
          title: "Update flake.nix"
          labels: |
            update
            automated
          assignees: darkkirb
          reviewers: darkkirb
          add-paths: flake.lock