recovery: give the incident tooling a permanent home (scripts/recovery/)

The 2026-08-03 cc-ci outage was recovered with ad-hoc tooling living in /tmp (leftover from a PREVIOUS incident, half-evaporated). Promoted to the repo: - scripts/recovery/hetzner.py — Hetzner API helper (status/actions/reboot/reset/ power/rescue-on|off/console), knows cc-ci=134485294 + orchestrator=134487234 by name; token from HCLOUD_TOKEN or /srv/cc-ci/.hcloud-token (0600, never in git). - scripts/recovery/hetzner-console.sh — shell-only VGA console: fresh console session -> websocat bridge -> vncdotool (venv auto-bootstrapped in ~/.cache). screenshot / key / type subcommands; encodes the reset-invalidates-session and single-connection-bridge gotchas. - scripts/recovery/README.md — the condensed 10-minute unreachable-server drill, incl. the GRUB submenu 1>N ids + clear-grubenv-after-switch rule. - hetzner-server-recovery skill: console/API sections now point at the repo tools instead of describing /tmp rebuilds. Smoke-tested: hetzner.py cc-ci status OK.
2026-08-04 01:57:34 +00:00
parent be7f8bc850
commit cb20bea7cd
4 changed files with 239 additions and 48 deletions
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+# Recovery tooling — permanent home
+
+Promoted from `/tmp` ad-hocery after the 2026-08-03 cc-ci 26.05 outage (see
+`.cc-ci-logs/server-update-2026-08-03.md` and the `hetzner-server-recovery` skill, which is
+the *procedure*; these are the *tools* it uses).
+
+| Tool | What it does |
+|---|---|
+| `hetzner.py <server> <cmd>` | Hetzner Cloud API: status, actions, reboot/reset/poweroff/poweron, rescue-on/off, console credentials. Knows `cc-ci` (134485294) and `orchestrator` (134487234) by name. |
+| `hetzner-console.sh <server> screenshot\|key\|type` | Shell-only access to the VGA console: fresh console session → websocat bridge → vncdotool (venv auto-bootstrapped at `~/.cache/hetzner-console-venv`). |
+
+**Token:** `HCLOUD_TOKEN` env, or `/srv/cc-ci/.hcloud-token` (chmod 600). Not in git, not in
+`.testenv`. Prefer per-incident tokens and revoke after — and never paste tokens into chat
+transcripts (the 2026-08-03 incident token was pasted mid-incident and had to be flagged for
+rotation).
+
+## The 10-minute unreachable-server drill (condensed from 2026-08-03)
+
+1. `hetzner.py cc-ci status` — "running" + no SSH/ping means booted-but-broken, not crashed.
+2. `hetzner-console.sh cc-ci screenshot /tmp/console.png` — look at the actual screen: which
+   generation booted? login prompt or emergency shell?
+3. Plain `reboot` first. If the default boot is the broken generation, DON'T fight GRUB
+   timing over VNC — go to rescue:
+   `rescue-on` → `poweroff` → wait `status=off` → `poweron` → `ssh root@<public-ip>` (key
+   113082420 = `~/.ssh/cc-ci-root-ed25519`; fresh `UserKnownHostsFile`).
+4. In rescue: `mount /dev/sda1 /mnt` and fix the boot default:
+   - Generations live in a GRUB **submenu**: entry ids are `1>N` (top level: 0 = default
+     entry, 1 = the submenu). A bare index like `2` silently falls back to the broken default.
+   - Persistent: `grub-editenv /mnt/boot/grub/grubenv set 'default=1>N'` (survives reboots).
+   - **Clear it after the next successful `nixos-rebuild switch`** — the regenerated grub.cfg
+     shifts indices and a stale override points at the wrong generation.
+   - Journal of the failed boot: `journalctl -D /mnt/var/log/journal --list-boots` / `-b <id>`.
+5. `rescue-off` → `poweroff` → `poweron` → verify → write the incident up in
+   `cc-ci-plan/JOURNAL.md` and (if server) `.cc-ci-logs/`.
+
+**Prevention:** `nixos-rebuild test` before `switch`, always (see AGENTS.md / the update
+skills) — `test` leaves the bootloader alone, so a power-cycle recovers by itself.
@@ -0,0 +1,76 @@
+#!/usr/bin/env bash
+# hetzner-console.sh — drive a Hetzner web-console (raw VNC over websocket) from a shell.
+# The screenshot/keyboard half of hetzner-server-recovery; proven in the 2026-08-03
+# cc-ci 26.05 outage (console screenshots identified the wrong-generation boot).
+#
+# Usage:
+#   hetzner-console.sh <server> screenshot <out.png>
+#   hetzner-console.sh <server> key <key> [key ...]     # e.g. key Down Down Return
+#   hetzner-console.sh <server> type "<text>"
+#
+# <server> = name/id understood by hetzner.py. Each invocation requests a FRESH console
+# session (they are cheap, and hard resets invalidate old ones), bridges it to a local
+# TCP port with websocat, and runs vncdo against it. The bridge is single-connection —
+# that is why every command re-requests + re-bridges.
+#
+# Gotchas encoded here so nobody rediscovers them at 2am:
+# - The wss_url from the API contains literal '&' — when it arrives via JSON it may be
+#   &-escaped; parse the JSON properly (as below), never paste from raw output.
+# - A hard `reset` drops the console websocket mid-session: re-request and reconnect.
+# - GRUB menus: generations live in a SUBMENU — one-shot boot ids are "1>N", and any
+#   persistent grubenv `default` must be cleared after the next switch regenerates
+#   grub.cfg (indices shift). See the hetzner-server-recovery skill.
+set -o errexit -o nounset -o pipefail
+
+HERE="$(dirname "$(readlink -f "${BASH_SOURCE[0]}")")"
+SERVER="${1:?usage: hetzner-console.sh <server> screenshot|key|type ...}"
+CMD="${2:?need a command: screenshot|key|type}"
+shift 2
+
+PORT="${CONSOLE_PORT:-5905}"
+VENV="${HOME}/.cache/hetzner-console-venv"
+
+# 1. vncdotool venv (bootstrap once; durable across incidents, unlike /tmp)
+if [ ! -x "${VENV}/bin/vncdo" ]; then
+  echo "bootstrapping vncdotool venv at ${VENV}..." >&2
+  python3 -m venv "${VENV}"
+  "${VENV}/bin/pip" -q install vncdotool
+fi
+
+# 2. fresh console session
+CREDS="$(python3 "${HERE}/hetzner.py" "${SERVER}" console)"
+WSS="$(printf '%s' "${CREDS}" | python3 -c 'import json,sys; print(json.load(sys.stdin)["wss_url"])')"
+PW="$(printf '%s' "${CREDS}" | python3 -c 'import json,sys; print(json.load(sys.stdin)["password"])')"
+
+# 3. bridge (single-connection; killed on exit)
+pkill -f "websocat.*${PORT}" 2>/dev/null || true
+sleep 0.5
+nix shell nixpkgs#websocat -c websocat --binary "tcp-listen:127.0.0.1:${PORT}" "${WSS}" \
+  > /tmp/hetzner-console-websocat.log 2>&1 &
+BRIDGE=$!
+trap 'kill ${BRIDGE} 2>/dev/null || true; pkill -f "websocat.*${PORT}" 2>/dev/null || true' EXIT
+sleep 2
+
+# 4. run the vncdo command
+case "${CMD}" in
+  screenshot)
+    OUT="${1:?screenshot needs an output path}"
+    timeout 40 "${VENV}/bin/vncdo" -s "127.0.0.1::${PORT}" -p "${PW}" capture "${OUT}"
+    echo "captured ${OUT}"
+    ;;
+  key)
+    [ $# -ge 1 ] || { echo "key needs at least one key name" >&2; exit 1; }
+    ARGS=()
+    for k in "$@"; do ARGS+=(key "$k" pause 0.3); done
+    timeout 60 "${VENV}/bin/vncdo" -s "127.0.0.1::${PORT}" -p "${PW}" "${ARGS[@]}"
+    echo "sent: $*"
+    ;;
+  type)
+    TEXT="${1:?type needs text}"
+    timeout 60 "${VENV}/bin/vncdo" -s "127.0.0.1::${PORT}" -p "${PW}" type "${TEXT}"
+    echo "typed"
+    ;;
+  *)
+    echo "unknown command ${CMD} (screenshot|key|type)" >&2; exit 1
+    ;;
+esac
@@ -0,0 +1,105 @@
+#!/usr/bin/env python3
+"""Hetzner Cloud recovery helper — the API half of hetzner-server-recovery.
+
+Promoted to the repo 2026-08-04 after the cc-ci 26.05 outage recovery was done with
+ad-hoc tooling living in /tmp (which had evaporated from the previous incident).
+
+Token: $HCLOUD_TOKEN, else the file $HCLOUD_TOKEN_FILE, else /srv/cc-ci/.hcloud-token
+(chmod 600; ask the operator for a token if absent — and prefer a per-incident token
+that gets revoked afterwards).
+
+Usage:
+  hetzner.py <server> status
+  hetzner.py <server> actions [n]          # recent actions, newest first
+  hetzner.py <server> reboot|reset|poweroff|poweron
+  hetzner.py <server> rescue-on [ssh_key_id ...]   # then poweroff+poweron to enter it
+  hetzner.py <server> rescue-off
+  hetzner.py <server> console             # prints wss_url + password (JSON)
+
+<server> is a name from SERVERS below or a numeric Hetzner server id.
+"""
+
+from __future__ import annotations
+
+import json
+import os
+import sys
+import urllib.error
+import urllib.request
+
+SERVERS = {
+    "cc-ci": 134485294,  # the CI server (nixos, `ssh cc-ci`, tailnet 100.95.31.88)
+    "orchestrator": 134487234,  # this host (cc-ci-orchestrator-1, tailnet 100.84.190.30)
+}
+# SSH keys registered in the Hetzner project (for rescue-mode injection):
+#   113082219 cc-ci-deploy · 113082420 cc-ci-orchestrator-deploy (= ~/.ssh/cc-ci-root-ed25519)
+DEFAULT_RESCUE_KEYS = [113082219, 113082420]
+
+
+def token() -> str:
+    tok = os.environ.get("HCLOUD_TOKEN")
+    if not tok:
+        path = os.environ.get("HCLOUD_TOKEN_FILE", "/srv/cc-ci/.hcloud-token")
+        try:
+            tok = open(path).read().strip()
+        except OSError:
+            sys.exit(
+                "ERROR: no Hetzner token. Set HCLOUD_TOKEN, or put one in "
+                f"{path} (chmod 600). Ask the operator; prefer a revocable per-incident token."
+            )
+    return tok
+
+
+def api(path: str, method: str = "GET", body: dict | None = None) -> dict:
+    req = urllib.request.Request(
+        "https://api.hetzner.cloud/v1" + path,
+        method=method,
+        headers={"Authorization": "Bearer " + token(), "Content-Type": "application/json"},
+        data=json.dumps(body).encode() if body is not None else None,
+    )
+    try:
+        with urllib.request.urlopen(req, timeout=30) as r:
+            raw = r.read()
+            return json.loads(raw) if raw.strip() else {}
+    except urllib.error.HTTPError as e:
+        sys.exit(f"ERROR: HTTP {e.code} on {method} {path}: {e.read()[:300]!r}")
+
+
+def main() -> None:
+    if len(sys.argv) < 3:
+        sys.exit(__doc__)
+    server, cmd, args = sys.argv[1], sys.argv[2], sys.argv[3:]
+    sid = SERVERS.get(server) or (int(server) if server.isdigit() else None)
+    if sid is None:
+        sys.exit(f"ERROR: unknown server {server!r} (known: {', '.join(SERVERS)} or numeric id)")
+
+    if cmd == "status":
+        d = api(f"/servers/{sid}")["server"]
+        print(
+            f"status={d['status']} rescue_enabled={d.get('rescue_enabled')} "
+            f"locked={d['locked']} public_ip={d['public_net']['ipv4']['ip']}"
+        )
+    elif cmd == "actions":
+        n = int(args[0]) if args else 10
+        for a in api(f"/servers/{sid}/actions?sort=started:desc&per_page={n}")["actions"]:
+            print(a["started"], a["command"], a["status"], a["progress"])
+    elif cmd in ("reboot", "reset", "poweroff", "poweron"):
+        r = api(f"/servers/{sid}/actions/{cmd}", "POST")
+        print(cmd, r["action"]["status"], r["action"]["started"])
+    elif cmd == "rescue-on":
+        keys = [int(k) for k in args] or DEFAULT_RESCUE_KEYS
+        r = api(f"/servers/{sid}/actions/enable_rescue", "POST", {"type": "linux64", "ssh_keys": keys})
+        print("enable_rescue", r["action"]["status"], "| root password:", r.get("root_password"))
+        print("NOTE: rescue boots on the next power cycle — run poweroff, wait for status=off, poweron.")
+    elif cmd == "rescue-off":
+        r = api(f"/servers/{sid}/actions/disable_rescue", "POST")
+        print("disable_rescue", r["action"]["status"])
+    elif cmd == "console":
+        r = api(f"/servers/{sid}/actions/request_console", "POST")
+        print(json.dumps({"wss_url": r["wss_url"], "password": r["password"]}))
+    else:
+        sys.exit(f"ERROR: unknown command {cmd!r}\n{__doc__}")
+
+
+if __name__ == "__main__":
+    main()