name: Docker smoke

# Runtime smoke gate for Docker init logic.
#
# Background: v0.51.84 (PR #2470) shipped a startup-killing :ro mount + chown
# interaction (EROFS under `set -e`) that 9 source-level pytest invariants +
# 5800+ existing tests all passed. The independent reviewer caught it by eye.
# This workflow closes that class of gap by actually `docker compose up`-ing
# each variant against a real Docker daemon on the GHA runner.
#
# Scope (intentionally small for v1):
#   - 3 compose variants (single, two-container, three-container)
#   - For multi-container variants, rebuild the local Dockerfile and re-tag
#     it as ghcr.io/nesquena/hermes-webui:latest BEFORE `up` so the PR's
#     changes to docker_init.bash / Dockerfile actually execute. Without this
#     the multi-container variants would pull the previous release from GHCR
#     and silently miss every PR-level regression.
#   - Pre-flight `docker compose config` job to catch schema/interpolation drift.
#   - Reaper before each smoke run + trap on EXIT for orphan defence.
#
# Out of scope for v1 (per design review):
#   - HERMES_WEBUI_SMOKE_TEST env flag in docker_init.bash (production-code footgun)
#   - --user 60000:60000 (skips the chown branch we're protecting against)
#   - Hadolint / yamllint (separate lint workflow, follow-up PR)
#   - Local-runnable scripts/docker-smoke-test.sh (ship CI first, then iterate)
#   - Podman runtime smoke (defer until a podman-specific bug ships)

on:
  pull_request:
    branches: [master]
    paths:
      - 'Dockerfile'
      - 'docker_init.bash'
      - 'docker-compose*.yml'
      - '.dockerignore'
      - '.env.docker.example'
      - '.github/workflows/docker-smoke.yml'
  push:
    branches: [master]
    paths:
      - 'Dockerfile'
      - 'docker_init.bash'
      - 'docker-compose*.yml'
      - '.dockerignore'
      - '.env.docker.example'
      - '.github/workflows/docker-smoke.yml'
  workflow_dispatch:

# Fork PRs run with no secrets — that's the right model. Pin to least privilege.
permissions:
  contents: read

jobs:
  compose-config:
    name: Compose config validation
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4

      - name: Validate every compose file parses
        run: |
          set -euo pipefail
          for f in docker-compose.yml docker-compose.two-container.yml docker-compose.three-container.yml; do
            echo "::group::compose config: $f"
            docker compose -f "$f" config > /dev/null
            echo "::endgroup::"
          done

  # Build the Docker image once and cache layers via GHA cache.
  # The smoke matrix jobs then pull from this cache instead of rebuilding
  # from scratch, saving ~1-3 minutes per variant.
  build-image:
    name: Build Docker image (cache layers)
    runs-on: ubuntu-latest
    needs: compose-config
    steps:
      - uses: actions/checkout@v4

      - uses: docker/setup-buildx-action@v3

      - name: Build and cache Docker image
        uses: docker/build-push-action@v6
        with:
          context: .
          load: true
          tags: ghcr.io/nesquena/hermes-webui:latest
          cache-from: type=gha
          cache-to: type=gha,mode=max

  smoke:
    name: Smoke ${{ matrix.variant }}
    runs-on: ubuntu-latest
    needs: [compose-config, build-image]
    timeout-minutes: 15
    strategy:
      fail-fast: false
      matrix:
        variant:
          - single
          - two-container
          - three-container
    steps:
      - uses: actions/checkout@v4

      - uses: docker/setup-buildx-action@v3

      # Restore the cached Docker image from the build-image job.
      # Read-only: the build-image job already populated the GHA cache, so the
      # smoke variants only need cache-from (no redundant cache-to re-export).
      - name: Restore Docker image from cache
        uses: docker/build-push-action@v6
        with:
          context: .
          load: true
          tags: ghcr.io/nesquena/hermes-webui:latest
          cache-from: type=gha

      - name: Resolve compose file + project name
        id: vars
        run: |
          set -euo pipefail
          case "${{ matrix.variant }}" in
            single)
              echo "compose_file=docker-compose.yml" >> "$GITHUB_OUTPUT"
              ;;
            two-container)
              echo "compose_file=docker-compose.two-container.yml" >> "$GITHUB_OUTPUT"
              ;;
            three-container)
              echo "compose_file=docker-compose.three-container.yml" >> "$GITHUB_OUTPUT"
              ;;
          esac
          # Per-run project name so concurrent jobs / reruns can't clobber each other.
          echo "project=hermes-smoke-${{ matrix.variant }}-${{ github.run_id }}-${{ github.run_attempt }}" >> "$GITHUB_OUTPUT"

      - name: Reap any prior hermes-smoke resources on this runner
        run: |
          set -euo pipefail
          # Hosted GHA runners are fresh, so this is mostly defence-in-depth for
          # self-hosted runner re-use. We rely primarily on the unique per-run
          # project name + `compose down -v --remove-orphans` in the EXIT trap
          # to clean up the resources THIS run creates; this step only sweeps
          # leftovers from prior runs that crashed before their trap fired.
          # Match by project-name prefix instead of labels (the compose files
          # don't carry hermes-smoke labels on their resources).
          for c in $(docker ps -aq --filter "name=hermes-smoke-"); do
            docker rm -f "$c" || true
          done
          for v in $(docker volume ls -q | grep "^hermes-smoke-" || true); do
            docker volume rm -f "$v" || true
          done
          for n in $(docker network ls --format '{{.Name}}' | grep "^hermes-smoke-" || true); do
            docker network rm "$n" || true
          done

      - name: Prepare ephemeral host paths
        id: paths
        run: |
          set -euo pipefail
          STATE_DIR="$(mktemp -d -t hermes-smoke-state-XXXXXX)"
          WORK_DIR="$(mktemp -d -t hermes-smoke-work-XXXXXX)"
          echo "state_dir=$STATE_DIR" >> "$GITHUB_OUTPUT"
          echo "work_dir=$WORK_DIR" >> "$GITHUB_OUTPUT"
          echo "Allocated:"
          echo "  HERMES_HOME      = $STATE_DIR"
          echo "  HERMES_WORKSPACE = $WORK_DIR"

      - name: Smoke (up + health + log scan + down)
        env:
          COMPOSE_FILE: ${{ steps.vars.outputs.compose_file }}
          PROJECT: ${{ steps.vars.outputs.project }}
          HERMES_HOME: ${{ steps.paths.outputs.state_dir }}
          HERMES_WORKSPACE: ${{ steps.paths.outputs.work_dir }}
        run: |
          set -euo pipefail

          # ----- Trap-guaranteed cleanup, regardless of exit reason -----
          cleanup() {
            local rc=$?
            echo "::group::Cleanup (rc=$rc)"
            docker compose -p "$PROJECT" -f "$COMPOSE_FILE" logs --no-color --tail=200 || true
            docker compose -p "$PROJECT" -f "$COMPOSE_FILE" down -v --remove-orphans || true
            rm -rf "$HERMES_HOME" "$HERMES_WORKSPACE" || true
            echo "::endgroup::"
            return $rc
          }
          trap cleanup EXIT

          echo "::group::docker compose up"
          # --wait blocks until all services report healthy OR --wait-timeout fires.
          # Compose v2 returns nonzero on either failure mode.
          docker compose -p "$PROJECT" -f "$COMPOSE_FILE" up -d --wait --wait-timeout 120
          echo "::endgroup::"

          echo "::group::container roster"
          docker compose -p "$PROJECT" -f "$COMPOSE_FILE" ps
          echo "::endgroup::"

          # ----- WebUI /health probe -----
          # Single-container: WebUI is on the host on 127.0.0.1:8787.
          # Two/three-container: same — both compose files publish 127.0.0.1:8787.
          echo "::group::Probe /health"
          attempts=0
          max_attempts=30
          until curl --fail --silent --max-time 5 http://127.0.0.1:8787/health > /dev/null; do
            attempts=$((attempts + 1))
            if [ "$attempts" -ge "$max_attempts" ]; then
              echo "❌ WebUI /health never returned 200 after $max_attempts attempts (~60s)"
              exit 1
            fi
            sleep 2
          done
          echo "✅ /health = 200 after $attempts attempts"
          echo "::endgroup::"

          # ----- Startup log scan: must not contain any known-bad signatures -----
          # These are the exact patterns that would have flagged #2470 in real time.
          # The grep -i is anchored to actual error tokens; benign log lines that
          # contain the substring 'error' in a stack-friendly context (e.g.
          # "errorless", URL paths) are improbable for these specific tokens.
          echo "::group::Startup log scan"
          LOGS="$(docker compose -p "$PROJECT" -f "$COMPOSE_FILE" logs --no-color)"
          # `!! ERROR` + `!! Exiting script` are the actual strings emitted by
          # docker_init.bash's error_exit() helper — the function name itself
          # never appears in output. The literal token `error_exit` is kept as
          # a belt-and-suspenders catch for any stray debug/echo of the name.
          BAD_PATTERNS='EROFS|Read-only file system|Traceback|PermissionError|!! ERROR|!! Exiting script|error_exit|groupmod: cannot|usermod: cannot|Failed to set (UID|GID|owner|permissions|ownership)'
          if echo "$LOGS" | grep -E -i "$BAD_PATTERNS"; then
            echo "❌ Startup logs contain known-bad pattern (see above)"
            exit 1
          fi
          echo "✅ No known-bad patterns in startup logs"
          echo "::endgroup::"