name: Build all NixOS Configurations

on:
  push:
    branches:
      - '**'
  schedule:
    - cron: "20 12 * * *" # not to frequent, GitHub only allows a few pulls per hour

jobs:

  nix build:
    runs-on: native
    steps:

      - name: checkout repository
        if: github.event_name != 'schedule'
        uses: actions/checkout@v2
        with:
          depth: 0

      - name: checkout repository (branch update)
        if: github.event_name == 'schedule'
        uses: actions/checkout@v2
        with:
          ref: "update"
          depth: 0

      - name: update nix flakes (branch update)
        if: github.event_name == 'schedule'
        run: |
          cat <<EOF > .ssh_key
          ${{ secrets.SSH_KEY }}
          EOF
          chmod 600 .ssh_key

          eval $(ssh-agent)
          ssh-add .ssh_key

          nix flake update
          
          echo $SSH_AGENT_PID
          kill $SSH_AGENT_PID
          rm .ssh_key

      - name: fetch and check
        run: |
          cat <<EOF > .ssh_key
          ${{ secrets.SSH_KEY }}
          EOF
          chmod 600 .ssh_key

          eval $(ssh-agent)
          ssh-add .ssh_key

          nix flake archive
          nix flake check --verbose --log-format raw
          
          echo $SSH_AGENT_PID
          kill $SSH_AGENT_PID
          rm .ssh_key

      - name: nix build orbi
        run: nix build .#nixosConfigurations.orbi.config.system.build.toplevel

      - name: nix build cream
        run: nix build .#nixosConfigurations.cream.config.system.build.toplevel

      - name: nix build cherry
        run: nix build .#nixosConfigurations.cherry.config.system.build.toplevel

      - name: nix build chungus
        run: nix build .#nixosConfigurations.chungus.config.system.build.toplevel

      - name: push if all fine (branch update)
        if: github.event_name == 'schedule'
        run: |
          
          git config --local user.email "action@git.ingolf-wagner.de"
          git config --local user.name "Forgejo Action"
          
          git diff --quiet && \
          git diff --staged --quiet || \
          (git commit -am "Update Nix flakes" && git push)