Add emergency Hetzner shutdown script

docs/infra.html

@@ -118,6 +118,16 @@ flowchart TB
           <li>Session auth: signed JWT cookie <code>session_token</code>; roles: USER, ADMIN, USER_MODERATOR, LISTING_MODERATOR.</li>
         </ul>
       </section>
+
+      <section class="card">
+        <h2>Emergency shutdown</h2>
+        <ul>
+          <li>Script: <code>scripts/emergency-shutdown.sh</code> issues Hetzner poweroff/shutdown commands for tracked nodes (currently <code>node1.lomavuokraus.fi</code> and <code>db1.lomavuokraus.fi</code>).</li>
+          <li>List tracked nodes: <code>./scripts/emergency-shutdown.sh --list</code>.</li>
+          <li>Hard stop everything: <code>./scripts/emergency-shutdown.sh --yes --confirm "SHUTDOWN ALL LOMAVUOKRAUS NODES NOW"</code> (default action is <code>poweroff</code>; use <code>--action shutdown</code> for ACPI).</li>
+          <li>Requires <code>hcloud</code> CLI with <code>HCLOUD_TOKEN</code> or configured at <code>~/.config/hcloud/cli.toml</code>; keep the node list updated when adding servers.</li>
+        </ul>
+      </section>
     </main>
     <script type="module">
       import mermaid from 'https://cdn.jsdelivr.net/npm/mermaid@10/dist/mermaid.esm.min.mjs';

scripts/emergency-shutdown.sh

@@ -0,0 +1,109 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+# Emergency hard power-off for all lomavuokraus Hetzner nodes.
+# Keep the NODES list up to date when adding/removing servers so this script
+# always covers every host.
+
+NODES=(
+  "node1.lomavuokraus.fi|k3s + ingress + app workloads"
+  "db1.lomavuokraus.fi|PostgreSQL"
+)
+
+CONFIRM_PHRASE="SHUTDOWN ALL LOMAVUOKRAUS NODES NOW"
+HCLOUD_BIN="${HCLOUD_BIN:-hcloud}"
+ACTION="poweroff" # poweroff = immediate; shutdown = ACPI (softer)
+
+usage() {
+  cat <<EOF
+Usage: $0 [--yes] [--confirm "${CONFIRM_PHRASE}"] [--action poweroff|shutdown] [--list]
+
+Options:
+  --list                List tracked nodes and exit.
+  --action <mode>       Either "poweroff" (default, immediate) or "shutdown" (soft ACPI).
+  --yes                 Actually issue the command (otherwise dry-run).
+  --confirm <phrase>    Required confirmation phrase: "${CONFIRM_PHRASE}"
+
+Env:
+  HCLOUD_BIN            Override hcloud binary path (default: hcloud)
+  HCLOUD_TOKEN          Hetzner API token (or ~/.config/hcloud/cli.toml)
+
+Examples:
+  $0 --list
+  $0 --yes --confirm "${CONFIRM_PHRASE}"
+EOF
+}
+
+log() {
+  echo "[$(date +"%H:%M:%S")] $*"
+}
+
+list_nodes() {
+  log "Tracked nodes:"
+  for entry in "${NODES[@]}"; do
+    IFS="|" read -r name desc <<<"$entry"
+    echo "- ${name}: ${desc}"
+  done
+}
+
+require_hcloud() {
+  if ! command -v "$HCLOUD_BIN" >/dev/null 2>&1; then
+    echo "hcloud CLI not found (HCLOUD_BIN=${HCLOUD_BIN}). Install it before running." >&2
+    exit 1
+  fi
+
+  if [[ -z "${HCLOUD_TOKEN:-}" && ! -f "${HOME}/.config/hcloud/cli.toml" ]]; then
+    echo "HCLOUD_TOKEN not set and no CLI config found at ~/.config/hcloud/cli.toml." >&2
+    exit 1
+  fi
+}
+
+CONFIRM_INPUT=""
+DO_IT=0
+LIST_ONLY=0
+
+while [[ $# -gt 0 ]]; do
+  case "$1" in
+    --yes) DO_IT=1 ;;
+    --confirm) shift; CONFIRM_INPUT="${1:-}";;
+    --action) shift; ACTION="${1:-poweroff}";;
+    --list) LIST_ONLY=1 ;;
+    -h|--help) usage; exit 0 ;;
+    *) echo "Unknown argument: $1" >&2; usage; exit 1 ;;
+  esac
+  shift
+done
+
+if [[ "$ACTION" != "poweroff" && "$ACTION" != "shutdown" ]]; then
+  echo "Invalid action: ${ACTION}. Use poweroff or shutdown." >&2
+  exit 1
+fi
+
+if [[ $LIST_ONLY -eq 1 ]]; then
+  list_nodes
+  exit 0
+fi
+
+log "Requested action: ${ACTION}"
+list_nodes
+
+if [[ $DO_IT -ne 1 ]]; then
+  log "Dry run only. Add --yes --confirm \"${CONFIRM_PHRASE}\" to execute."
+  exit 0
+fi
+
+if [[ "${CONFIRM_INPUT}" != "${CONFIRM_PHRASE}" ]]; then
+  echo "Confirmation phrase mismatch. Expected: \"${CONFIRM_PHRASE}\"." >&2
+  exit 1
+fi
+
+require_hcloud
+
+for entry in "${NODES[@]}"; do
+  IFS="|" read -r name desc <<<"$entry"
+  log "Issuing ${ACTION} to ${name} (${desc})..."
+  # poweroff is an immediate hard stop; shutdown attempts a graceful halt.
+  "$HCLOUD_BIN" server "${ACTION}" "$name"
+done
+
+log "All shutdown requests sent."