624 lines
25 KiB
Python
624 lines
25 KiB
Python
"""Runtime inventory + update plan for the fleet-update pipeline (#91277 Phase 2).
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One read-only pass that answers, BEFORE any mutation: what Hermes runtimes
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are running on this machine, how is each one deployed, which of them will
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this update touch, and how will each be restarted?
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This is the "plan" phase of the transactional deployment model (#88683):
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plan → snapshot → apply → restart-per-kind → verify → report
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The module is deliberately side-effect free — every collector is a probe
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over primitives that already exist (`find_profile_gateway_processes`,
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`_get_service_pids`, `gateway_state.json` code stamps from #91283,
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`detect_install_method`) — so `hermes update --plan` can run on a live
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fleet with zero risk, and the update receipt can embed the inventory
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without changing update behavior.
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Deployment kinds (the concept most fleet-update bugs were missing):
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git — source checkout; updatable in place via `hermes update`
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docker — published image; NOT updatable in place (pull + recreate)
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nix/apt — package-manager owned; updatable via the manager only
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unknown — no marker; treated as in-place updatable (legacy default)
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Supervisors (how a runtime is restarted after code changes):
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systemd / launchd — restart via the service manager (fleet-wide)
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desktop — Desktop app supervises `hermes serve`; it respawns
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manual — plain process; SIGTERM + watcher/manual relaunch
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"""
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from __future__ import annotations
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import logging
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import os
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from dataclasses import dataclass, field, asdict
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from pathlib import Path
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from typing import Any, Optional
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logger = logging.getLogger(__name__)
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@dataclass
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class RuntimeRecord:
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"""One running (or expected) Hermes runtime on this machine."""
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kind: str # gateway | dashboard | serve
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profile: str # profile name ("default", ...)
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pid: Optional[int] = None # live PID when known
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supervisor: str = "manual" # systemd | launchd | desktop | manual
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code_sha: Optional[str] = None # stamped running-code sha (#91283)
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code_version: Optional[str] = None
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restart_via: str = "" # human-readable restart mechanism
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detail: dict = field(default_factory=dict)
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def to_dict(self) -> dict[str, Any]:
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return asdict(self)
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@dataclass
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class UpdatePlan:
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"""The full pre-update picture: install shape + runtimes + actions."""
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install_method: str = "unknown" # git | docker | nix | apt | ...
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updatable_in_place: bool = True
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update_mechanism: str = "hermes update"
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expected_sha: Optional[str] = None # current checkout HEAD (pre-pull)
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expected_version: Optional[str] = None
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profiles: list = field(default_factory=list)
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runtimes: list = field(default_factory=list) # list[RuntimeRecord]
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def to_dict(self) -> dict[str, Any]:
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payload = asdict(self)
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payload["runtimes"] = [
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r.to_dict() if isinstance(r, RuntimeRecord) else r
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for r in self.runtimes
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]
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return payload
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def _detect_supervisor_for_pid(
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pid: int, service_pids: set, windows_service_pids: set | None = None
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) -> str:
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"""Classify how a live gateway PID is supervised."""
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if windows_service_pids and pid in windows_service_pids:
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# SCM-supervised Windows gateway (WinSW/NSSM/sc.exe create): the
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# update pause machinery stops the SERVICE via sc.exe instead of
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# killing the child, so #91277 Phase 2 reconciliation must plan it
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# under its own mechanism id, not "manual".
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return "windows-service"
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if pid in service_pids:
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try:
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from hermes_cli.gateway import is_macos, supports_systemd_services
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if supports_systemd_services():
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return "systemd"
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if is_macos():
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return "launchd"
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except Exception:
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pass
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return "service"
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return "manual"
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def _restart_mechanism(supervisor: str, profile: str) -> str:
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"""Machine-readable restart mechanism id for a runtime.
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THE policy table (#91277 Phase 2): restart execution consumes these ids
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via :func:`match_runtime_outcomes` / the update's restart phase, and the
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receipt records per-runtime outcomes against them. Display strings are
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derived by :func:`describe_restart_mechanism` — never the other way
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around.
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"""
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if supervisor == "systemd":
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return "systemd"
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if supervisor == "launchd":
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return "launchd"
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if supervisor == "desktop":
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return "desktop"
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if supervisor == "windows-service":
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return "windows-service"
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if supervisor == "manual-serve":
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return "respawn-argv"
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return "manual"
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def describe_restart_mechanism(mechanism: str, profile: str) -> str:
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"""Human-readable description of a restart mechanism id."""
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if mechanism == "systemd":
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return "systemctl restart (drain-first SIGUSR1 when supported)"
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if mechanism == "launchd":
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return "launchctl kickstart -k (drain-first, per-label domain)"
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if mechanism == "desktop":
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return "Desktop app respawns its serve backend"
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if mechanism == "windows-service":
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return "sc.exe stop before venv mutation, sc.exe start after update"
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if mechanism == "respawn-argv":
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return "stop before code swap, relaunch with recorded launch args"
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if profile != "default":
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return f"hermes -p {profile} gateway restart"
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return "hermes gateway restart"
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def collect_runtime_inventory() -> UpdatePlan:
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"""Build the pre-update plan. Read-only; never raises.
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Every collector degrades independently — a probe failure yields fewer
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rows, not an exception. The result is embeddable in the update receipt
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and printable via :func:`print_update_plan`.
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"""
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plan = UpdatePlan()
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# --- install shape / deployment kind ---------------------------------
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try:
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from hermes_cli.config import (
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detect_install_method,
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get_managed_system,
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recommended_update_command_for_method,
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)
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method = detect_install_method()
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plan.install_method = method
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managed = get_managed_system()
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if managed:
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plan.install_method = managed
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plan.updatable_in_place = method in ("git", "unknown") and not managed
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# Baked image provenance (#91277 Phase 3): when the image marker is
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# present it is authoritative — a bind-mounted checkout inside a
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# container can look like `git` to the heuristics while the running
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# filesystem is actually an immutable image. Fail-closed: an invalid
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# marker still flips the plan to not-updatable.
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try:
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from hermes_cli.image_provenance import read_image_provenance
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provenance = read_image_provenance()
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if provenance is not None:
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plan.updatable_in_place = False
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if provenance.valid and provenance.manager:
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plan.install_method = provenance.manager
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except Exception as exc:
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logger.debug("Image provenance probe failed: %s", exc)
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plan.update_mechanism = recommended_update_command_for_method(method)
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except Exception as exc:
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logger.debug("Install-method probe failed: %s", exc)
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# --- expected code identity (pre-pull) --------------------------------
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try:
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from hermes_cli.build_info import get_code_identity
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identity = get_code_identity(refresh=True)
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plan.expected_sha = identity.get("sha")
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plan.expected_version = identity.get("version")
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except Exception as exc:
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logger.debug("Code-identity probe failed: %s", exc)
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# --- profiles ----------------------------------------------------------
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profile_homes: list[tuple[str, Path]] = []
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try:
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from hermes_cli.profiles import (
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_get_default_hermes_home,
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_get_profiles_root,
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_PROFILE_ID_RE,
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)
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default_home = _get_default_hermes_home()
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if default_home.is_dir():
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profile_homes.append(("default", default_home))
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root = _get_profiles_root()
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if root.is_dir():
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for entry in sorted(root.iterdir()):
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if (
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entry.is_dir()
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and entry.name != "default"
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and _PROFILE_ID_RE.match(entry.name)
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):
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profile_homes.append((entry.name, entry))
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plan.profiles = [name for name, _ in profile_homes]
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except Exception as exc:
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logger.debug("Profile enumeration failed: %s", exc)
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# --- service-managed PIDs (fleet-wide) ---------------------------------
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service_pids: set = set()
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try:
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from hermes_cli.gateway import _get_service_pids
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service_pids = _get_service_pids(all_profiles=True) or set()
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except Exception as exc:
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logger.debug("Service-PID probe failed: %s", exc)
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# --- SCM-supervised gateway PIDs (Windows) ------------------------------
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# find_windows_gateway_services() maps validated gateway PIDs through
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# process ancestry to running SCM service PIDs (no-op off Windows). The
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# update's pause phase stops these via `sc.exe stop` / restarts via
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# `sc.exe start`, so the plan must carry the matching mechanism id for
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# the #91277 Phase 2 reconciliation and the fleet check.
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windows_service_pids: set = set()
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try:
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from hermes_cli.gateway import find_windows_gateway_services
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windows_service_pids = {
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int(service.gateway_pid)
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for service in find_windows_gateway_services()
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}
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except Exception as exc:
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logger.debug("Windows SCM service-ownership probe failed: %s", exc)
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# --- per-profile gateways (PID files + runtime status stamps) ----------
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seen_pids: set[int] = set()
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try:
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from gateway.status import _pid_exists, read_runtime_status
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for profile, home in profile_homes:
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# Prefer the gateway-owned control socket (#92091): identity
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# declared by the process itself, including its own supervisor
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# provenance — no argv/PID inference. Scan fallback below.
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identity = None
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try:
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from gateway.control_socket import identify_gateway
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identity = identify_gateway(home)
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except Exception:
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identity = None
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if identity:
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try:
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sock_pid = int(identity.get("pid"))
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except (TypeError, ValueError):
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sock_pid = None
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if sock_pid is not None:
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if sock_pid in seen_pids:
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# One multiplex gateway can answer identify for
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# several profile homes — one runtime record per
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# process, not per home.
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continue
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seen_pids.add(sock_pid)
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declared = identity.get("supervisor")
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supervisor = (
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str(declared)
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if declared
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else _detect_supervisor_for_pid(
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sock_pid, service_pids, windows_service_pids
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)
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)
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sock_sha = identity.get("code_sha")
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plan.runtimes.append(
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RuntimeRecord(
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kind="gateway",
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profile=profile,
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pid=sock_pid,
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supervisor=supervisor,
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code_sha=str(sock_sha) if sock_sha else None,
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code_version=identity.get("code_version"),
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restart_via=_restart_mechanism(supervisor, profile),
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)
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)
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continue
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record = read_runtime_status(home / "gateway_state.json")
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pid: Optional[int] = None
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code_sha = code_version = None
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if record:
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try:
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pid = int(record.get("pid"))
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except (TypeError, ValueError):
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pid = None
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code_sha = record.get("code_sha")
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code_version = record.get("code_version")
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if pid is None or not _pid_exists(pid):
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continue
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seen_pids.add(pid)
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supervisor = _detect_supervisor_for_pid(
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pid, service_pids, windows_service_pids
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)
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plan.runtimes.append(
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RuntimeRecord(
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kind="gateway",
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profile=profile,
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pid=pid,
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supervisor=supervisor,
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code_sha=str(code_sha) if code_sha else None,
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code_version=code_version,
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restart_via=_restart_mechanism(supervisor, profile),
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)
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)
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except Exception as exc:
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logger.debug("Gateway-state inventory failed: %s", exc)
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# PID-file mapped gateways not covered by a runtime-status record
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try:
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from hermes_cli.gateway import find_profile_gateway_processes
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for proc in find_profile_gateway_processes():
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if proc.pid in seen_pids:
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continue
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seen_pids.add(proc.pid)
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supervisor = _detect_supervisor_for_pid(
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proc.pid, service_pids, windows_service_pids
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)
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plan.runtimes.append(
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RuntimeRecord(
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kind="gateway",
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profile=proc.profile,
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pid=proc.pid,
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supervisor=supervisor,
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restart_via=_restart_mechanism(supervisor, proc.profile),
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)
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)
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except Exception as exc:
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logger.debug("PID-file gateway inventory failed: %s", exc)
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# Serve/dashboard backends from the spawn ledger (#63206). These are the
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# runtimes the gateway collectors above can never see: a manually
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# launched `hermes serve --host <ip>` for a remote Desktop, or a
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# long-lived `hermes dashboard`. Every serve/dashboard registers itself
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# (with structured host/port/profile since #63206) at startup, and
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# ledger_entries() live-verifies (pid, create_time) so PID reuse never
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# fabricates a row. Desktop-supervised backends are classified by their
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# recorded spawner still being alive — those restart via the Desktop's
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# own respawn, not ours.
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try:
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from hermes_cli.process_identity import ledger_entries, spawner_is_dead
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for entry in ledger_entries():
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purpose = entry.get("purpose")
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if purpose not in ("serve", "dashboard"):
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continue
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pid = entry.get("pid")
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if not isinstance(pid, int) or pid in seen_pids:
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continue
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seen_pids.add(pid)
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has_live_spawner = spawner_is_dead(entry) is False
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supervisor = "desktop" if has_live_spawner else "manual-serve"
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profile = str(entry.get("profile") or "default")
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plan.runtimes.append(
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RuntimeRecord(
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kind=str(purpose),
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profile=profile,
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pid=pid,
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supervisor=supervisor,
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restart_via=_restart_mechanism(supervisor, profile),
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detail={
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"argv": entry.get("argv") or "",
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"host": entry.get("host") or "",
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"port": entry.get("port"),
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# Process incarnation, not just the numeric PID: a
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# post-update survivor probe that compares PIDs alone
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# calls a NEW serve that reused the number a survivor
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# (#92145 review).
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"create_time": entry.get("create_time"),
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},
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)
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)
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except Exception as exc:
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logger.debug("Serve/dashboard ledger inventory failed: %s", exc)
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return plan
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def print_update_plan(plan: UpdatePlan) -> None:
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"""Human-readable plan — what the update will touch and how."""
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print("Update plan:")
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print(f" Install: {plan.install_method}", end="")
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if plan.expected_version:
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print(f" (v{plan.expected_version}", end="")
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if plan.expected_sha:
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print(f" @ {plan.expected_sha[:8]}", end="")
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print(")", end="")
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print()
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if not plan.updatable_in_place:
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print(" ⚠ This install is NOT updatable in place.")
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print(f" Update via: {plan.update_mechanism}")
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profiles = ", ".join(plan.profiles) if plan.profiles else "(none found)"
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print(f" Profiles: {profiles}")
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if not plan.runtimes:
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print(" Running Hermes services: none detected — code swap only.")
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return
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print(f" Running services to restart ({len(plan.runtimes)}):")
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for runtime in plan.runtimes:
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sha = f" @ {runtime.code_sha[:8]}" if runtime.code_sha else ""
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print(
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f" • {runtime.kind} [{runtime.profile}] pid {runtime.pid}"
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f" — {runtime.supervisor}{sha}"
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)
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print(
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" restart: "
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f"{describe_restart_mechanism(runtime.restart_via, runtime.profile)}"
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)
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_SERVE_KINDS = ("serve", "dashboard")
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def _serve_unit_matches_profile(profile: str, unit: object) -> bool:
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"""Does *unit* name a ``hermes-serve*``/``hermes-dashboard*`` unit for *profile*?
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Serve/dashboard runtimes have their OWN unit vocabulary; the gateway's
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``hermes-gateway*`` names never cover them (#100479). Exact names only —
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``work`` must not claim ``hermes-serve-workbench`` — and a scope prefix
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(``user/hermes-serve``) is tolerated because the restart phase records
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scope-qualified identities in some lists.
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"""
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name = str(unit).removesuffix(".service")
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if "/" in name:
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name = name.rsplit("/", 1)[-1]
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if profile == "default":
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return name in {"hermes-serve", "hermes-dashboard"}
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return name in {f"hermes-serve-{profile}", f"hermes-dashboard-{profile}"}
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def _serve_runtime_outcome(
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r: RuntimeRecord,
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*,
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killed: set,
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failed_set: set,
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restarted_set: set,
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stale_serves: "set | None",
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) -> str:
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"""Outcome for one serve/dashboard runtime — never the gateway's."""
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if r.pid is not None and r.pid in killed:
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return "stopped"
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if any(_serve_unit_matches_profile(r.profile, u) for u in failed_set):
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return "failed"
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if stale_serves is not None:
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# Incarnation-verified: the pre-update process is gone (replaced by
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# its unit / the dashboard cleanup respawn / the Desktop app) or it
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# is still alive on pre-update code.
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return "unaccounted" if r.pid in stale_serves else "restarted"
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if any(_serve_unit_matches_profile(r.profile, s) for s in restarted_set):
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return "restarted"
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return "unaccounted"
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def match_runtime_outcomes(
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plan: "UpdatePlan",
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*,
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restarted_services: list,
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relaunched_profiles: list,
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externally_supervised_profiles: list,
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killed_pids: set,
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failed_units: list,
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stale_serve_pids: "set | None" = None,
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) -> list[dict[str, Any]]:
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"""Reconcile the plan's runtimes against what the restart phase DID.
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#91277 Phase 2 (restart via declared mechanism): the platform restart
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branches each re-discover their own targets, so a runtime the plan saw
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can be missed entirely with no signal. This cross-checks every planned
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runtime against the phase's bookkeeping and returns one outcome row per
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runtime::
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{"kind", "profile", "pid", "mechanism", "outcome"}
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outcome: ``restarted`` (service restarted / profile relaunched /
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handed to external supervisor), ``stopped`` (pid killed, watcher or
|
|
operator relaunches), ``failed`` (in the phase's failed/stale list) or
|
|
``unaccounted`` — the plan saw it and NO bookkeeping mentions it: the
|
|
blind-spot tripwire (same philosophy as the fleet matrix's DOWN row).
|
|
Never raises; on any probe error returns what it has.
|
|
|
|
Serve/dashboard runtimes are reconciled in their OWN vocabulary
|
|
(#100479): a ``hermes-serve*``/``hermes-dashboard*`` unit, a killed
|
|
PID, or — when the caller passes ``stale_serve_pids`` (the
|
|
``(pid, create_time)``-verified survivor probe,
|
|
:func:`hermes_cli.update_abort_recovery._surviving_pre_update_serve_runtimes`)
|
|
— liveness: a pre-update serve whose incarnation is gone was replaced
|
|
(unit restart, dashboard cleanup respawn, Desktop respawn) and counts as
|
|
``restarted``; one still alive is ``unaccounted``. They never borrow the
|
|
gateway's outcome: ``relaunched_profiles`` and ``hermes-gateway*`` name a
|
|
different process that shares the profile, nothing more. Without the
|
|
probe result, an untouched serve stays ``unaccounted`` (fail closed).
|
|
"""
|
|
outcomes: list[dict[str, Any]] = []
|
|
try:
|
|
failed_set = {str(u) for u in (failed_units or [])}
|
|
restarted_set = {str(s) for s in (restarted_services or [])}
|
|
relaunched = set(relaunched_profiles or [])
|
|
external = set(externally_supervised_profiles or [])
|
|
killed = {int(p) for p in (killed_pids or set())}
|
|
stale_serves = (
|
|
{int(p) for p in stale_serve_pids} if stale_serve_pids is not None else None
|
|
)
|
|
|
|
for runtime in plan.runtimes:
|
|
r = runtime if isinstance(runtime, RuntimeRecord) else None
|
|
if r is None:
|
|
continue
|
|
if r.kind in _SERVE_KINDS:
|
|
outcomes.append(
|
|
{
|
|
"kind": r.kind,
|
|
"profile": r.profile,
|
|
"pid": r.pid,
|
|
"mechanism": r.restart_via,
|
|
"outcome": _serve_runtime_outcome(
|
|
r,
|
|
killed=killed,
|
|
failed_set=failed_set,
|
|
restarted_set=restarted_set,
|
|
stale_serves=stale_serves,
|
|
),
|
|
}
|
|
)
|
|
continue
|
|
outcome = "unaccounted"
|
|
# The bare "hermes-gateway" unit name is gateway-specific: a
|
|
# serve/dashboard runtime that merely shares the default
|
|
# profile is a different process the gateway restart never
|
|
# touched, and must not borrow its outcome (#100479).
|
|
if r.profile in relaunched or r.profile in external:
|
|
outcome = "restarted"
|
|
elif r.pid is not None and r.pid in killed:
|
|
outcome = "stopped"
|
|
elif any(
|
|
r.profile in unit
|
|
or (
|
|
r.kind == "gateway"
|
|
and r.profile == "default"
|
|
and "hermes-gateway" in unit
|
|
)
|
|
for unit in failed_set
|
|
):
|
|
outcome = "failed"
|
|
elif any(
|
|
r.profile in svc
|
|
or (
|
|
r.kind == "gateway"
|
|
and r.profile == "default"
|
|
and "hermes-gateway" in svc
|
|
)
|
|
for svc in restarted_set
|
|
):
|
|
outcome = "restarted"
|
|
outcomes.append(
|
|
{
|
|
"kind": r.kind,
|
|
"profile": r.profile,
|
|
"pid": r.pid,
|
|
"mechanism": r.restart_via,
|
|
"outcome": outcome,
|
|
}
|
|
)
|
|
except Exception as exc:
|
|
logger.debug("Runtime-outcome reconciliation failed: %s", exc)
|
|
return outcomes
|
|
|
|
|
|
def report_unaccounted_runtimes(outcomes: list[dict[str, Any]]) -> bool:
|
|
"""Print a loud warning for runtimes the restart phase never touched.
|
|
|
|
Returns True when at least one planned runtime is unaccounted — the
|
|
caller escalates exactly like a STALE/DOWN fleet row (exit 1): a runtime
|
|
the plan promised to restart, silently missed, is the class this phase
|
|
exists to kill.
|
|
"""
|
|
missed = [o for o in outcomes if o.get("outcome") == "unaccounted"]
|
|
if not missed:
|
|
return False
|
|
print()
|
|
print(" ⚠ Planned runtimes the restart phase never touched:")
|
|
for o in missed:
|
|
print(
|
|
f" ✗ {o['kind']} [{o['profile']}] pid {o['pid']}"
|
|
f" — planned mechanism: {o['mechanism']}"
|
|
)
|
|
print(" Restart them manually, then verify:")
|
|
if any(o.get("kind") not in _SERVE_KINDS for o in missed):
|
|
print(" hermes gateway restart # active profile")
|
|
print(" hermes -p <profile> gateway restart # named profile")
|
|
if any(o.get("kind") in _SERVE_KINDS for o in missed):
|
|
# A serve/dashboard is not reachable by any `gateway restart`
|
|
# command (#100479): name the process, not the wrong verb.
|
|
print(" systemctl --user restart hermes-serve.service # unit-managed serve")
|
|
print(" relaunch `hermes serve` / `hermes dashboard` / the Desktop app")
|
|
return True
|
|
|
|
|
|
def record_plan_in_receipt(plan: UpdatePlan) -> None:
|
|
"""Attach the inventory to the active update receipt. Never raises."""
|
|
try:
|
|
import hermes_cli.update_receipt as ur
|
|
|
|
if ur._current is not None:
|
|
ur._current.data["plan"] = plan.to_dict()
|
|
except Exception as exc:
|
|
logger.debug("Could not record plan in receipt: %s", exc)
|