# Sync modules/docker-registry/* → /opt/registry/ on docker-registry VM
# (10.0.20.10) on change, and bounce containers + nginx when needed.
#
# Replaces the manual "ssh + scp + docker compose up -d" that was required
# after the 2026-04-19 `registry:2 → registry:2.8.3` pin landed. The deploy
# flow is now: edit a file in modules/docker-registry/ → git push → this
# pipeline runs → registry VM picks up the change.
#
# Trigger: push to master that touches any managed file (see `when.path`),
# or a manual run via Woodpecker UI / API.
#
# Credentials:
#   - registry_ssh_key: Woodpecker repo-secret (ed25519 keypair provisioned
#     2026-04-19 as `woodpecker-registry-config-sync`). Public key lives in
#     /root/.ssh/authorized_keys on 10.0.20.10. Private key mirrored in
#     Vault `secret/woodpecker/registry_ssh_key` (subkeys private_key /
#     public_key / known_hosts_entry) for recovery.
#
# Why bounce nginx every time: nginx caches upstream DNS at startup, so if
# any registry-* container gets recreated (new IP on the docker bridge),
# nginx keeps forwarding to a stale address. Always restart nginx as the
# last step — see docs/runbooks/registry-vm.md § "Bouncing registry
# containers — the nginx DNS trap".

when:
  - event: push
    branch: master
    path:
      include:
        - 'modules/docker-registry/docker-compose.yml'
        - 'modules/docker-registry/fix-broken-blobs.sh'
        - 'modules/docker-registry/cleanup-tags.sh'
        - 'modules/docker-registry/nginx_registry.conf'
        - 'modules/docker-registry/config-private.yml'
  - event: manual

clone:
  git:
    image: woodpeckerci/plugin-git
    settings:
      partial: false
      depth: 1
      attempts: 3

steps:
  - name: deploy
    image: alpine:3.20
    environment:
      REGISTRY_SSH_KEY:
        from_secret: registry_ssh_key
    commands:
      - apk add --no-cache openssh-client rsync
      - mkdir -p ~/.ssh && chmod 700 ~/.ssh
      - printf '%s\n' "$REGISTRY_SSH_KEY" > ~/.ssh/id_ed25519
      - chmod 600 ~/.ssh/id_ed25519
      # Pin host key — CI's ~/.ssh/known_hosts is ephemeral, so accept-new on first pull.
      - ssh-keyscan -t ed25519 10.0.20.10 >> ~/.ssh/known_hosts 2>/dev/null
      - echo '---detecting changed files---'
      - |
        # Mirror the remote state of each file so we can diff and decide what bounces.
        CHANGED=""
        for f in docker-compose.yml fix-broken-blobs.sh cleanup-tags.sh nginx_registry.conf config-private.yml; do
          LOCAL="modules/docker-registry/$f"
          REMOTE="/opt/registry/$f"
          if [ ! -f "$LOCAL" ]; then
            echo "skip $f (not in repo)"
            continue
          fi
          # Pull the remote copy into /tmp for a diff. ssh -n avoids stdin-hogging.
          REMOTE_CONTENT=$(ssh -n -o BatchMode=yes root@10.0.20.10 "cat $REMOTE 2>/dev/null || true")
          LOCAL_CONTENT=$(cat "$LOCAL")
          if [ "$LOCAL_CONTENT" = "$REMOTE_CONTENT" ]; then
            echo "unchanged: $f"
          else
            echo "---diff: $f ---"
            echo "$REMOTE_CONTENT" > /tmp/remote.txt
            diff -u /tmp/remote.txt "$LOCAL" | head -40 || true
            CHANGED="$CHANGED $f"
          fi
        done
        echo "CHANGED_FILES=$CHANGED"
        printf '%s' "$CHANGED" > /tmp/changed
      - echo '---applying---'
      - |
        CHANGED=$(cat /tmp/changed)
        if [ -z "$CHANGED" ]; then
          echo "No files changed — exiting cleanly (manual run with no drift)."
          exit 0
        fi
        # Ship every managed file unconditionally — scp is cheap, idempotency is safe.
        scp -o BatchMode=yes \
          modules/docker-registry/docker-compose.yml \
          modules/docker-registry/fix-broken-blobs.sh \
          modules/docker-registry/cleanup-tags.sh \
          modules/docker-registry/nginx_registry.conf \
          modules/docker-registry/config-private.yml \
          root@10.0.20.10:/opt/registry/
        ssh -n -o BatchMode=yes root@10.0.20.10 '
          chmod +x /opt/registry/fix-broken-blobs.sh /opt/registry/cleanup-tags.sh
        '
      - echo '---bouncing containers + nginx---'
      - |
        CHANGED=$(cat /tmp/changed)
        # Compose-visible files: docker-compose.yml (image tag, mounts) and
        # config-private.yml (registry config → needs registry-private reload).
        BOUNCE_COMPOSE=0
        BOUNCE_NGINX=0
        echo "$CHANGED" | grep -q "docker-compose.yml" && BOUNCE_COMPOSE=1
        echo "$CHANGED" | grep -q "config-private.yml" && BOUNCE_COMPOSE=1
        echo "$CHANGED" | grep -q "nginx_registry.conf" && BOUNCE_NGINX=1

        if [ "$BOUNCE_COMPOSE" = "1" ]; then
          echo "compose-visible change → pull + up -d"
          ssh -n -o BatchMode=yes root@10.0.20.10 '
            cd /opt/registry
            docker compose pull 2>&1 | tail -5
            docker compose up -d 2>&1 | tail -20
          '
          # Any compose recreate requires nginx DNS refresh too.
          BOUNCE_NGINX=1
        fi

        if [ "$BOUNCE_NGINX" = "1" ]; then
          echo "bouncing nginx to flush upstream DNS cache"
          ssh -n -o BatchMode=yes root@10.0.20.10 '
            docker restart registry-nginx
            sleep 3
            docker ps --format "{{.Names}}\t{{.Image}}\t{{.Status}}" | grep -E "registry-"
          '
        fi

        if [ "$BOUNCE_COMPOSE" = "0" ] && [ "$BOUNCE_NGINX" = "0" ]; then
          echo "only script files changed (cron-picks-up semantics) — no bounce needed"
        fi
      - echo '---verify---'
      - |
        ssh -n -o BatchMode=yes root@10.0.20.10 '
          echo "=== catalog ==="
          # Prove auth + routing survived.
          curl -sk -o /dev/null -w "catalog (unauth → 401 expected): HTTP %{http_code}\n" \
            https://127.0.0.1:5050/v2/
          echo "=== integrity scan (dry-run) ==="
          python3 /opt/registry/fix-broken-blobs.sh --dry-run 2>&1 | tail -5
        '

  - name: slack
    image: curlimages/curl:8.11.0
    environment:
      SLACK_WEBHOOK:
        from_secret: slack_webhook
    commands:
      - |
        curl -s -X POST -H 'Content-type: application/json' \
          --data "{\"channel\":\"general\",\"text\":\"Registry config sync on 10.0.20.10: ${CI_PIPELINE_STATUS}\"}" \
          "$SLACK_WEBHOOK" || true
    when:
      status: [success, failure]