# Kvitt image build on Gitea Actions (SPEC §10.3, D-104). NOT YET RUN (written 2026-10-18 from the owner's working
# example workflow and the Gitea Actions documentation; the first run is an owner step, infra/README.md).
#
# Runner: act_runner with the label `host` on the owner's Raspberry Pi (Alpine-based host, docker builds on the
# Pi itself). Pushes three linux/arm64 images to the Gitea container registry of the same instance (gitea.lan,
# plain HTTP), each tagged with the version vMAJOR.MINOR.PATCH and `latest`, then pushes the git tag of that version.
# On the Kvitt Pi: /opt/kvitt/deploy.sh <version>.
#
# Secret: `kvitt_cicd`, a repository secret holding a Gitea access token with scope write:package of the user that
# pushes (owner step, infra/README.md). It is used only for `docker login`; the git tag push at the end goes through
# the credentials actions/checkout stored (the job's own token), not this secret, so it needs no write:repository.
#
# RISK: the runner is a Raspberry Pi 3 with 1 GB RAM and the server image compiles about 232 Rust crates
# (aws-lc-sys's C code included). The build passes CARGO_BUILD_JOBS=1 to keep memory down; server/Dockerfile
# honours it (`ARG CARGO_BUILD_JOBS`, SPEC §10.3). The Dockerfile keeps the cargo registry and the target directory
# in BuildKit cache mounts, which persist in the reused builder `local-http-builder`, so later builds are
# incremental. First-build duration on the Pi: unknown.
# The builder's buildkitd.toml is read only when the builder is created; after changing it, remove the builder on
# the runner once (docker buildx rm local-http-builder), which also drops its cache.
# Fallback: infra/build-images.sh on the Mac.
name: Build Kvitt images
env:
  MAJOR: 1
  MINOR: 0
  REGISTRY_HOST: gitea.lan
  # ${KVITT_REGISTRY} of SPEC §10.3 (D-104).
  REGISTRY: gitea.lan/jacobh2

defaults:
  run:
    shell: sh

on:
  push:
    paths:
      - "server/**"
      - "infra/cert-sync/**"
      - "infra/backup/**"
      - ".gitea/workflows/**"
  workflow_dispatch: {}

jobs:
  build:
    runs-on: host
    steps:
      - name: Install Git and Docker CLI
        run: apk add --no-cache git docker-cli docker-cli-buildx
      - name: Log in to Gitea Container Registry
        # The token reaches the shell as an environment variable, never as text inside the script.
        env:
          REGISTRY_TOKEN: ${{ secrets.kvitt_cicd }}
          REGISTRY_USER: ${{ github.actor }}
        run: printf '%s' "$REGISTRY_TOKEN" | docker login "$REGISTRY_HOST" -u "$REGISTRY_USER" --password-stdin
      - name: Create Custom Buildx Builder for HTTP
        run: |
          # Create the builder once and reuse it, so its BuildKit cache (cargo registry, target) survives runs.
          if docker buildx inspect local-http-builder >/dev/null 2>&1; then
            docker buildx use local-http-builder
          else
            # A configuration rule forcing plain HTTP for the local registry.
            cfg=$(mktemp)
            printf '[registry."%s"]\n  http = true\n' "$REGISTRY_HOST" > "$cfg"
            docker buildx create --use --name local-http-builder --config "$cfg"
            rm -f "$cfg"
          fi
      - name: Checkout
        uses: actions/checkout@v4
        with:
          # Tells the action to use the local 'git' binary installed above
          set-safe-directory: 'true'
          fetch-depth: 0
      - name: Determine Version
        run: |
          # git's own version sort: busybox sort on the Alpine runner may lack -V.
          LATEST_TAG=$(git tag -l "v$MAJOR.$MINOR.*" --sort=-v:refname | head -n 1)
          if [ -z "$LATEST_TAG" ]; then
            VERSION="v$MAJOR.$MINOR.0"
          else
            # The patch number is the part after the last dot.
            VERSION="v$MAJOR.$MINOR.$((${LATEST_TAG##*.} + 1))"
          fi
          echo "Version: $VERSION"
          echo "VERSION=$VERSION" >> "$GITHUB_ENV"
      # --provenance=false on every build: one plain linux/arm64 manifest per tag, as Podman and infra/build-images.sh
      # push. Without it buildx pushes an index with an attestation entry (platform unknown/unknown), which the Gitea
      # package page lists as an extra platform; nothing here reads attestations.
      - name: Build cert-sync image
        run: |
          docker buildx build \
            --platform linux/arm64 \
            --provenance=false \
            -t "$REGISTRY/kvitt-cert-sync:$VERSION" \
            -t "$REGISTRY/kvitt-cert-sync:latest" \
            --metadata-file /tmp/kvitt-cert-sync.metadata.json \
            ./infra/cert-sync \
            --push
      - name: Build backup image
        run: |
          docker buildx build \
            --platform linux/arm64 \
            --provenance=false \
            -t "$REGISTRY/kvitt-backup:$VERSION" \
            -t "$REGISTRY/kvitt-backup:latest" \
            --metadata-file /tmp/kvitt-backup.metadata.json \
            ./infra/backup \
            --push
      - name: Build server image
        run: |
          # Context server/: server/Dockerfile copies the Cargo workspace from its own directory.
          docker buildx build \
            --platform linux/arm64 \
            --provenance=false \
            --build-arg CARGO_BUILD_JOBS=1 \
            -f ./server/Dockerfile \
            -t "$REGISTRY/kvitt-server:$VERSION" \
            -t "$REGISTRY/kvitt-server:latest" \
            --metadata-file /tmp/kvitt-server.metadata.json \
            ./server \
            --push
      - name: Print image digests
        # The digests deploy.sh prints and records on the Kvitt Pi (/opt/kvitt/deployed-digests, D-117) must match.
        run: |
          for name in cert-sync backup server; do
            digest=$(sed -n 's/.*"containerimage.digest": *"\([^"]*\)".*/\1/p' "/tmp/kvitt-$name.metadata.json")
            echo "$REGISTRY/kvitt-$name:$VERSION ${digest:-unknown}"
            rm -f "/tmp/kvitt-$name.metadata.json"
          done
      - name: Tag and Push Version
        run: |
          git tag "$VERSION"
          git push origin "$VERSION"