name: Flatpak

# One job, three outcomes:
#   pull request  -> build the Flatpak and run the suite inside it
#   push master   -> also publish the result as the `beta` branch of the
#                    Catcrafts repo and refresh the rolling `latest` release
#   tag X.Y.Z     -> publish as `stable` and create release X.Y.Z
#
# The `flatpak` runner label is the privileged runner on the Hetzner box
# (bubblewrap needs it) with four volumes allowed: the Sdk install, the
# flatpak-builder state (ccache and the LLVM module, so only crafter-build
# itself rebuilds on a normal run), the published repo's web root, and the
# repo signing key, which lives on the runner host and never in the forge.
on:
  pull_request:
    branches: [master]
  push:
    branches: [master]
    # Bare semver tags. Spelled with globs so it means the same whether the
    # forge reads it as a workflow pattern or as a plain glob; `latest`, the
    # rolling tag this workflow moves itself, does not start with a digit.
    tags: ['[0-9]*.[0-9]*.[0-9]*']
  workflow_dispatch:

env:
  APP_ID: net.catcrafts.CrafterBuild
  MANIFEST: packaging/flatpak/net.catcrafts.CrafterBuild.yaml
  CI_MANIFEST: packaging/flatpak/ci-manifest.yaml
  RUNTIME: org.freedesktop.Sdk//26.08
  REPO_DIR: /srv/flatpak/repo
  WEB_DIR: /srv/flatpak

jobs:
  flatpak:
    runs-on: flatpak
    container:
      image: archlinux:latest
      options: >-
        -v crafter-flatpak-system:/var/lib/flatpak
        -v crafter-flatpak-builder:/root/.cache/flatpak-builder
        -v /var/www/flatpak:/srv/flatpak
        -v /etc/crafter-flatpak:/run/crafter-flatpak:ro
    steps:
      - name: Install tools
        run: |
          pacman-key --init
          pacman-key --populate archlinux
          pacman -Sy --noconfirm --needed archlinux-keyring
          pacman -Syu --noconfirm --needed flatpak flatpak-builder ccache git nodejs jq gnupg go-yq ostree python
          git config --global --add safe.directory '*'

      - name: Sdk
        # A no-op once the volume is warm; `update` follows point releases.
        run: |
          flatpak remote-add --if-not-exists flathub https://dl.flathub.org/repo/flathub.flatpakrepo
          flatpak install -y --noninteractive flathub "$RUNTIME"
          flatpak update -y --noninteractive

      - name: Checkout
        uses: actions/checkout@v4
        with:
          fetch-depth: 0
          persist-credentials: true

      - name: Version and channel
        id: meta
        run: |
          set -eu
          if [ "${GITHUB_REF_TYPE}" = tag ]; then
            version="$GITHUB_REF_NAME"
            branch=stable
            # The metainfo's newest release is the release notes and must be
            # the version being tagged.
            top=$(grep -m1 -oP '<release version="\K[^"]+' packaging/flatpak/net.catcrafts.CrafterBuild.metainfo.xml)
            if [ "$top" != "$version" ]; then
              echo "metainfo lists $top as the newest release, but the tag is $version" >&2
              exit 1
            fi
          else
            # A master build names itself after the release it follows, the
            # way a local checkout does: 2.0.0-3-g21746b1 is three commits
            # past 2.0.0. Before the first tag there is nothing to describe
            # from and the bare hash gets a placeholder in front.
            described=$(git describe --tags --always --exclude=latest)
            case "$described" in
              [0-9]*.[0-9]*.[0-9]*) version="$described" ;;
              *) version="0.0.0-dev+$described" ;;
            esac
            branch=beta
          fi
          echo "version=$version" >> "$GITHUB_OUTPUT"
          echo "branch=$branch" >> "$GITHUB_OUTPUT"
          echo "version $version, flatpak branch $branch"

      - name: Build
        # The manifest is rewritten beside the original so its relative
        # source paths still resolve. The suite runs inside this build.
        env:
          VERSION: ${{ steps.meta.outputs.version }}
        run: |
          set -eu
          yq '."build-options".env.CRAFTER_BUILD_VERSION = strenv(VERSION)' "$MANIFEST" > "$CI_MANIFEST"
          grep -n 'CRAFTER_BUILD_VERSION' "$CI_MANIFEST"
          flatpak-builder --force-clean --ccache --disable-rofiles-fuse \
            --state-dir=/root/.cache/flatpak-builder \
            --repo=repo --default-branch="${{ steps.meta.outputs.branch }}" \
            build-dir "$CI_MANIFEST"

      - name: Smoke test
        run: |
          flatpak-builder --run build-dir "$CI_MANIFEST" crafter-build --version
          flatpak-builder --run build-dir "$CI_MANIFEST" sh -c 'cd examples/hello-world && crafter-build && ls bin/*/hello*'

      # Everything below publishes and only runs on master and on tags.
      - name: Bundle
        if: github.event_name != 'pull_request'
        run: |
          mkdir -p dist
          flatpak build-bundle repo "dist/crafter-build-${{ steps.meta.outputs.version }}.flatpak" "$APP_ID" "${{ steps.meta.outputs.branch }}"
          cp packaging/flatpak/net.catcrafts.CrafterBuild.flatpakref dist/
          (cd dist && sha256sum * > SHA256SUMS)
          ls -la dist

      - name: Upload bundle
        if: github.event_name != 'pull_request'
        uses: actions/upload-artifact@v3
        with:
          name: crafter-build-${{ steps.meta.outputs.version }}
          path: dist/*.flatpak
          if-no-files-found: error

      - name: Publish to the Catcrafts repo
        if: github.event_name != 'pull_request'
        run: |
          set -eu
          # The signing key is generated once on the runner host
          # (/etc/crafter-flatpak: signing-key.asc and key-id) and mounted
          # read-only; it is imported into a throwaway keyring per run.
          if [ ! -s /run/crafter-flatpak/signing-key.asc ] || [ ! -s /run/crafter-flatpak/key-id ]; then
            echo "no signing key under /etc/crafter-flatpak on the runner host; generate it as described in AGENTS.md (CI and publishing)" >&2
            exit 1
          fi
          export GNUPGHOME=$(mktemp -d)
          gpg --batch --quiet --import /run/crafter-flatpak/signing-key.asc
          FLATPAK_GPG_KEY_ID=$(cat /run/crafter-flatpak/key-id)
          # The live repo is the canonical copy; builds are promoted into it,
          # never built into it.
          # Keyed on the repo's config file, not the directory: the web root
          # may exist as an empty directory before the first publish.
          [ -f "$REPO_DIR/config" ] || ostree init --repo="$REPO_DIR" --mode=archive
          flatpak build-commit-from --src-repo=repo \
            --gpg-sign="$FLATPAK_GPG_KEY_ID" --gpg-homedir="$GNUPGHOME" \
            "$REPO_DIR" "app/$APP_ID/x86_64/${{ steps.meta.outputs.branch }}"
          flatpak build-update-repo --gpg-sign="$FLATPAK_GPG_KEY_ID" --gpg-homedir="$GNUPGHOME" \
            --generate-static-deltas --prune "$REPO_DIR"
          # The repo description and the app ref carry the public key.
          key=$(gpg --export "$FLATPAK_GPG_KEY_ID" | base64 --wrap=0)
          sed "s|GPGKey=.*|GPGKey=$key|" packaging/flatpak/catcrafts.flatpakrepo > "$WEB_DIR/catcrafts.flatpakrepo"
          sed "s|GPGKey=.*|GPGKey=$key|" packaging/flatpak/net.catcrafts.CrafterBuild.flatpakref > "$WEB_DIR/net.catcrafts.CrafterBuild.flatpakref"

      - name: Rolling 'latest' release
        if: github.event_name != 'pull_request' && github.ref_type != 'tag'
        run: |
          git config user.email "ci@catcrafts.net"
          git config user.name "Crafter Build CI"
          git tag -f latest
          git push origin latest --force
      - name: Publish rolling 'latest' release
        if: github.event_name != 'pull_request' && github.ref_type != 'tag'
        uses: https://code.forgejo.org/actions/forgejo-release@v2
        with:
          direction: upload
          url: ${{ github.server_url }}
          repo: ${{ github.repository }}
          tag: latest
          title: Latest master build
          prerelease: true
          override: true
          release-dir: dist
          token: ${{ secrets.GITHUB_TOKEN }}

      - name: Release notes
        if: github.ref_type == 'tag'
        run: |
          # The newest <release> block's description, as plain text.
          python3 - > release-notes.md <<'EOF'
          import re, html
          text = open("packaging/flatpak/net.catcrafts.CrafterBuild.metainfo.xml").read()
          block = re.search(r"<release [^>]*>(.*?)</release>", text, re.S).group(1)
          paras = re.findall(r"<p>(.*?)</p>", block, re.S)
          print("\n\n".join(html.unescape(" ".join(p.split())) for p in paras))
          print("\nInstall:\n\n    flatpak remote-add --if-not-exists catcrafts https://flatpak.catcrafts.net/catcrafts.flatpakrepo\n    flatpak install catcrafts net.catcrafts.CrafterBuild\n")
          EOF
      - name: Publish release
        if: github.ref_type == 'tag'
        uses: https://code.forgejo.org/actions/forgejo-release@v2
        with:
          direction: upload
          url: ${{ github.server_url }}
          repo: ${{ github.repository }}
          tag: ${{ github.ref_name }}
          title: crafter-build ${{ github.ref_name }}
          release-notes-file: release-notes.md
          release-dir: dist
          token: ${{ secrets.GITHUB_TOKEN }}