db66b21ae4
Gate findings on the #108614 salvage (2c + simplify-code): - CopilotACPProfile.fetch_models promised None on failure but raised (AuthError on a missing CLI, RuntimeError/TimeoutError from the probe) — only the caller in hermes_cli/models.py caught it; any other caller got exceptions. Wrap the body and return None so the docstring and the base ProviderProfile.fetch_models contract hold. - timeout_seconds was a PER-REQUEST budget (initialize + session/new each got the full timeout => ~30s worst-case foreground stall on a hung CLI). One shared session deadline. - /model --refresh (clear_provider_models_cache) wiped the disk cache but not the new session memo, so a fresh CLI login stayed stale for 5 min past an explicit refresh. - A failed probe is now memoized for 30s instead of the full 5 min, so signing in to the CLI is picked up on the next switch. - _fresh_acp_memo fixture restores the memo on teardown — no cross-test state leak.
473 lines
24 KiB
Python
473 lines
24 KiB
Python
"""OpenAI-compatible shim that forwards Hermes requests to `copilot --acp`.
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Each request starts a short-lived ACP session, sends the formatted conversation
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as one prompt, collects text chunks, and returns the minimal OpenAI-client shape.
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"""
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from __future__ import annotations
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import contextlib
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import json
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import logging
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import os
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import queue
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import re
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import shlex
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import subprocess
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import threading
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import time
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from collections import deque
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from collections.abc import Callable, Iterator
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from pathlib import Path
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from types import SimpleNamespace
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from typing import Any
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from agent.acp_openai_bridge import (
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completion_to_stream_chunks as _completion_to_stream_chunks,
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extract_tool_calls_from_text as _extract_tool_calls_from_text,
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render_tool_bridge_sections as _render_tool_bridge_sections,
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)
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from agent.file_safety import get_read_block_error, get_write_denied_error, is_write_approval_required
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from agent.redact import redact_sensitive_text
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from tools.environments.local import hermes_subprocess_env
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ACP_MARKER_BASE_URL = "acp://copilot"
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logger = logging.getLogger(__name__)
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_DEFAULT_TIMEOUT_SECONDS = 900.0
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# Stderr fingerprint of the deprecated `gh copilot` extension. Require BOTH the product name
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# AND a deprecation marker: the NEW `@github/copilot` CLI legitimately mentions "copilot-cli".
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_DEPRECATION_REQUIRED = ("gh-copilot",)
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_DEPRECATION_MARKERS = ("has been deprecated", "no commands will be executed")
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_ROLE_LABELS = {"system": "System", "user": "User", "assistant": "Assistant", "tool": "Tool", "context": "Context"}
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# Probe verdicts per binary path (~50ms --help paid once per process). Only definitive
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# True/False is cached, so a CLI installed mid-session is picked up.
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_ACP_PROBE_CACHE: dict[str, bool] = {}
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_PROMPT_PREAMBLE = (
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"You are being used as the active ACP agent backend for Hermes.",
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"Use ACP capabilities to complete tasks.",
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"IMPORTANT: If you take an action with a tool, you MUST output tool calls using <tool_call>{...}</tool_call> blocks with JSON exactly in OpenAI function-call shape.",
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"If no tool is needed, answer normally.",
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)
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_INITIALIZE_PARAMS = {
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"protocolVersion": 1,
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"clientCapabilities": {"fs": {"readTextFile": True, "writeTextFile": True}},
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"clientInfo": {"name": "hermes-agent", "title": "Hermes Agent", "version": "0.0.0"},
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}
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_DEPRECATED_CLI_ERROR = (
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"Hermes ACP mode requires the NEW GitHub Copilot CLI (github.com/github/copilot-cli), but the binary it just "
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"spawned is the deprecated `gh copilot` extension.\n\n"
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"Install the new CLI:\n npm install -g @github/copilot\n # then verify with: copilot --help\n\n"
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"If `copilot` already resolves to the new CLI but you still see this,\npoint Hermes at it explicitly:\n"
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" export HERMES_COPILOT_ACP_COMMAND=/path/to/new/copilot\n\n"
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"Alternative: use the `copilot` provider (no ACP, hits the Copilot API\ndirectly with a Copilot subscription "
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"token) via `hermes setup`.\n\nOriginal error:\n"
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)
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def _is_gh_copilot_deprecation_message(stderr_text: str) -> bool:
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"""True iff stderr looks like the deprecated gh-copilot extension's banner."""
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lower = stderr_text.lower()
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return any(req in lower for req in _DEPRECATION_REQUIRED) and any(m in lower for m in _DEPRECATION_MARKERS)
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def _resolve_command() -> str:
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return os.getenv("HERMES_COPILOT_ACP_COMMAND", "").strip() or os.getenv("COPILOT_CLI_PATH", "").strip() or "copilot"
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def _resolve_args() -> list[str]:
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return shlex.split(os.getenv("HERMES_COPILOT_ACP_ARGS", "").strip()) or ["--acp", "--stdio"]
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def _acp_supported(command: str, args: list[str]) -> bool | None:
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"""Tri-state ``--acp`` probe (a CLI without the flag exits 1 and the parent would wait the
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full child timeout for stdout that never arrives). True = help advertises --acp; False =
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help ran cleanly without it (caller fast-fails); None = inconclusive (binary missing /
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--help failed → normal spawn error). Skipped when ``--acp`` is not in ``args`` (custom transport)."""
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if "--acp" not in args:
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return True
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if (cached := _ACP_PROBE_CACHE.get(command)) is not None:
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return cached
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try:
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probe = subprocess.run(
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[command, "--help"], capture_output=True, text=True, encoding="utf-8", errors="replace", timeout=5,
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stdin=subprocess.DEVNULL,
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)
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except (FileNotFoundError, subprocess.TimeoutExpired, OSError):
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return None
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if probe.returncode != 0:
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return None
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# ``--acp`` as a flag token; tolerate spacing and ``[--acp]`` variants.
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verdict = _ACP_PROBE_CACHE[command] = bool(re.search(r"(?:^|[\s\[])--acp(?:[\s=\],]|$)", probe.stdout, re.MULTILINE))
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return verdict
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def _resolve_home_dir() -> str:
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"""Stable HOME for child ACP processes; /tmp as a last resort so the child never starts HOME-less."""
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if home := os.environ.get("HOME", "").strip():
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return home
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if (expanded := os.path.expanduser("~")) and expanded != "~":
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return expanded
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try:
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import pwd
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return pwd.getpwuid(os.getuid()).pw_dir.strip() or "/tmp" # windows-footgun: ok — POSIX fallback inside try/except (pwd import fails on Windows)
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except Exception:
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return "/tmp"
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def _build_subprocess_env() -> dict[str, str]:
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from hermes_constants import apply_subprocess_home_env
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# Copilot ACP drives a model and needs LLM provider credentials; the central helper still
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# strips Tier-1 secrets (bot tokens, GitHub auth, infra).
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# See #29157.
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env = hermes_subprocess_env(inherit_credentials=True)
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env["HOME"] = _resolve_home_dir()
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apply_subprocess_home_env(env)
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return env
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def _jsonrpc_result(message_id: Any, result: Any) -> dict[str, Any]:
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return {"jsonrpc": "2.0", "id": message_id, "result": result}
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def _jsonrpc_error(message_id: Any, code: int, message: str) -> dict[str, Any]:
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return {"jsonrpc": "2.0", "id": message_id, "error": {"code": code, "message": message}}
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def _enabled_id_list(entries: Any, key: str) -> list[str]:
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"""Ordered ids whose ``_meta.copilotEnablement`` is not ``disabled``."""
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seen: set[str] = set()
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result: list[str] = []
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for entry in entries or []:
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if not isinstance(entry, dict):
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continue
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value = str(entry.get(key) or "").strip()
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if (not value or value in seen
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or str((entry.get("_meta") or {}).get("copilotEnablement") or "").strip().lower() == "disabled"):
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continue
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seen.add(value)
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result.append(value)
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return result
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def _model_config_option(session: dict[str, Any]) -> dict[str, Any] | None:
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return next((option for option in (session.get("configOptions") or []) if isinstance(option, dict)
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and "model" in (option.get("category"), option.get("id"))), None)
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def _session_model_ids(session: dict[str, Any]) -> list[str]:
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"""Account-authorized model ids advertised by ``session/new`` in ACP v1 or its legacy extension."""
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if option := _model_config_option(session):
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return _enabled_id_list(option.get("options"), "value")
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return _legacy_session_model_ids(session)
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def _legacy_session_model_ids(session: dict[str, Any]) -> list[str]:
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return _enabled_id_list((session.get("models") or {}).get("availableModels"), "modelId")
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def _model_selection_request(session: dict[str, Any], requested_model: str) -> tuple[str, dict[str, str]] | None:
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"""ACP request selecting ``requested_model`` for ``session``: stable v1
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``session/set_config_option``, else Copilot's pre-stabilization ``session/set_model``
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when no model config option is advertised. A reported model list is authoritative:
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unknown and policy-disabled ids return None instead of being sent."""
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session_id = str(session.get("sessionId") or "").strip()
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requested_model = str(requested_model or "").strip()
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if not session_id or not requested_model or requested_model == "copilot-acp":
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return None
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option = _model_config_option(session)
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if option:
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if requested_model not in _enabled_id_list(option.get("options"), "value"):
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return None
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return "session/set_config_option", {"sessionId": session_id, "configId": str(option.get("id") or "model"), "value": requested_model}
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available = _legacy_session_model_ids(session)
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return None if available and requested_model not in available else ("session/set_model", {"sessionId": session_id, "modelId": requested_model})
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def _format_messages_as_prompt(
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messages: list[dict[str, Any]], model: str | None = None, tools: list[dict[str, Any]] | None = None, tool_choice: Any = None,
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) -> str:
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# Deliberately no "requested model" line: the model is applied for real via ACP session/set_model;
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# a prompt-text mention makes a substituted backend model FALSELY self-identify as the requested
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# one. Copilot has no tools of its own that collide with Hermes', so forward the whole toolset.
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sections: list[str] = [*_PROMPT_PREAMBLE, *_render_tool_bridge_sections(tools, tool_choice)]
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transcript: list[str] = []
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for message in (m for m in messages if isinstance(m, dict)):
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role = str(message.get("role") or "unknown").strip().lower()
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if rendered := _render_message_content(message.get("content")):
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transcript.append(f"{_ROLE_LABELS.get(role, 'Context')}:\n{rendered}")
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if transcript:
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sections.append("Conversation transcript:\n\n" + "\n\n".join(transcript))
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sections.append("Continue the conversation from the latest user request.")
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return "\n\n".join(section.strip() for section in sections if section and section.strip())
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def _render_message_content(content: Any) -> str:
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if content is None:
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return ""
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if isinstance(content, dict):
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if "text" in content:
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return str(content.get("text") or "").strip()
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return content["content"].strip() if isinstance(content.get("content"), str) else json.dumps(content, ensure_ascii=True)
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if isinstance(content, list):
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parts = [item if isinstance(item, str) else item["text"].strip() for item in content if isinstance(item, str)
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or (isinstance(item, dict) and isinstance(item.get("text"), str) and item["text"].strip())]
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return "\n".join(parts).strip()
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return str(content).strip()
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def _ensure_path_within_cwd(path_text: str, cwd: str) -> Path:
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if not Path(path_text).is_absolute():
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raise PermissionError("ACP file-system paths must be absolute.")
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resolved, root = Path(path_text).resolve(), Path(cwd).resolve()
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try:
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resolved.relative_to(root)
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except ValueError as exc:
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raise PermissionError(f"Path '{resolved}' is outside the session cwd '{root}'.") from exc
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return resolved
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def _effective_timeout(timeout: Any) -> float:
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"""Normalise a float or httpx.Timeout-like object to wall-clock seconds (largest component wins)."""
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if isinstance(timeout, (int, float)):
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return float(timeout)
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candidates = [getattr(timeout, attr, None) for attr in ("read", "write", "connect", "pool", "timeout")]
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return max((float(v) for v in candidates if isinstance(v, (int, float))), default=_DEFAULT_TIMEOUT_SECONDS)
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def _fs_read_text_file(params: dict[str, Any], cwd: str) -> Any:
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path = _ensure_path_within_cwd(str(params.get("path") or ""), cwd)
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if block_error := get_read_block_error(str(path)):
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raise PermissionError(block_error)
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try:
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content = path.read_text(encoding="utf-8")
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except FileNotFoundError:
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content = ""
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line, limit = params.get("line"), params.get("limit")
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if isinstance(line, int) and line > 1:
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end = line - 1 + limit if isinstance(limit, int) and limit > 0 else None
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content = "".join(content.splitlines(keepends=True)[line - 1:end])
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return {"content": redact_sensitive_text(content, force=True) if content else content}
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def _fs_write_text_file(params: dict[str, Any], cwd: str) -> Any:
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path = _ensure_path_within_cwd(str(params.get("path") or ""), cwd)
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if denied := get_write_denied_error(str(path)):
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raise PermissionError(denied)
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if is_write_approval_required(str(path)): # soft-gated for interactive tools; the ACP shim has no human channel → fail closed
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raise PermissionError(f"Write denied: '{path}' requires interactive approval and cannot be written through the ACP file bridge.")
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path.parent.mkdir(parents=True, exist_ok=True)
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path.write_text(str(params.get("content") or ""), encoding="utf-8")
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return None
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_FS_HANDLERS = {"fs/read_text_file": _fs_read_text_file, "fs/write_text_file": _fs_write_text_file}
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class CopilotACPClient:
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"""Minimal OpenAI-client-compatible facade for Copilot ACP."""
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# Declared for agent/auxiliary_client.py: this shim drives an ACP subprocess over stdio, so it is
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# already a complete client (never re-dispatch through a wire adapter) and async-safe as-is.
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HERMES_SKIP_TRANSPORT_WRAP = True
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HERMES_SKIP_ASYNC_WRAP = True
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def __init__(
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self, *, api_key: str | None = None, base_url: str | None = None, default_headers: dict[str, str] | None = None,
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acp_command: str | None = None, acp_args: list[str] | None = None, acp_cwd: str | None = None, command: str | None = None,
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args: list[str] | None = None, **_: Any,
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):
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self.api_key, self.base_url = api_key or "copilot-acp", base_url or ACP_MARKER_BASE_URL
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self._default_headers = dict(default_headers or {})
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self._acp_command = acp_command or command or _resolve_command()
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self._acp_args = list(acp_args or args or _resolve_args())
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self._acp_cwd = str(Path(acp_cwd or os.getcwd()).resolve())
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self.chat = SimpleNamespace(completions=SimpleNamespace(create=self._create_chat_completion))
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self.is_closed, self._active_process = False, None
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self._active_process_lock = threading.Lock()
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def close(self) -> None:
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with self._active_process_lock:
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proc, self._active_process = self._active_process, None
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self.is_closed = True
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try:
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if proc is not None:
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proc.terminate()
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proc.wait(timeout=2)
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except Exception:
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with contextlib.suppress(Exception):
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proc.kill()
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def _create_chat_completion(
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self, *, model: str | None = None, messages: list[dict[str, Any]] | None = None, timeout: float | None = None,
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tools: list[dict[str, Any]] | None = None, tool_choice: Any = None, stream: bool = False, **_: Any,
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) -> Any:
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prompt_text = _format_messages_as_prompt(messages or [], model=model, tools=tools, tool_choice=tool_choice)
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response_text, reasoning = self._run_prompt(prompt_text, timeout_seconds=_effective_timeout(timeout), model=model)
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tool_calls, cleaned_text = _extract_tool_calls_from_text(response_text)
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message = SimpleNamespace(
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content=cleaned_text, tool_calls=tool_calls, reasoning=reasoning or None, reasoning_content=reasoning or None,
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reasoning_details=None,
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)
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completion = SimpleNamespace(
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choices=[SimpleNamespace(message=message, finish_reason="tool_calls" if tool_calls else "stop")],
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usage=SimpleNamespace(prompt_tokens=0, completion_tokens=0, total_tokens=0, prompt_tokens_details=SimpleNamespace(cached_tokens=0)),
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model=model or "copilot-acp",
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)
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return _completion_to_stream_chunks(completion) if stream else completion
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def _spawn(self) -> subprocess.Popen[str]:
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# Fast-fail when the CLI rejects --acp (else the parent waits the full child timeout for stdout that
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# never arrives). ``None`` falls through to the spawn's established start error.
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if _acp_supported(self._acp_command, self._acp_args) is False:
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preview = " ".join(self._acp_args[:3]) if self._acp_args else "(none)"
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raise RuntimeError(
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f"ACP transport not supported by '{self._acp_command}': `{preview}` is rejected as an unknown option. This "
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"usually means the CLI is an older release (e.g. Claude Code v2.x) or a different tool than expected. Either "
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"install a CLI that ships with --acp support (e.g. `@github/copilot` late 2025+), or set "
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"HERMES_COPILOT_ACP_COMMAND / HERMES_COPILOT_ACP_ARGS to a working pair."
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)
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try:
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from hermes_cli._subprocess_compat import windows_hide_flags # hide the Windows console flash (#56747); pipes intact for the ACP wire
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# Hide the console the CLI child would otherwise flash on Windows (#56747). Hide-only — stdio
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# pipes stay intact for the ACP wire.
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proc = subprocess.Popen(
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[self._acp_command] + self._acp_args, stdin=subprocess.PIPE, stdout=subprocess.PIPE, stderr=subprocess.PIPE,
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text=True, encoding='utf-8', errors='replace', bufsize=1, cwd=self._acp_cwd, env=_build_subprocess_env(),
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creationflags=windows_hide_flags(),
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)
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except FileNotFoundError as exc:
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raise RuntimeError(f"Could not start Copilot ACP command '{self._acp_command}'. Install GitHub Copilot CLI or set "
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"HERMES_COPILOT_ACP_COMMAND/COPILOT_CLI_PATH.") from exc
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if proc.stdin is None or proc.stdout is None:
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proc.kill()
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raise RuntimeError("Copilot ACP process did not expose stdin/stdout pipes.")
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self.is_closed = False
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with self._active_process_lock:
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self._active_process = proc
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return proc
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@contextlib.contextmanager
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def _session(
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self, timeout_seconds: float, *, allow_file_requests: bool = True
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) -> Iterator[tuple[dict[str, Any], Callable[..., Any]]]:
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"""Start one ACP process and yield its ``session/new`` result plus request callable."""
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proc = self._spawn()
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inbox: queue.Queue[dict[str, Any]] = queue.Queue()
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stderr_tail: deque[str] = deque(maxlen=40)
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def _decode(line: str) -> dict[str, Any]:
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try:
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return json.loads(line)
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except Exception:
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return {"raw": line.rstrip("\n")}
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def _pump(stream, sink) -> None:
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for line in stream or ():
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sink(line)
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threading.Thread(target=_pump, args=(proc.stdout, lambda line: inbox.put(_decode(line))), daemon=True).start()
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threading.Thread(target=_pump, args=(proc.stderr, lambda line: stderr_tail.append(line.rstrip("\n"))), daemon=True).start()
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request_ids = iter(range(1, 1 << 62))
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# One budget for the WHOLE session (initialize + session/new + any prompt), not per
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# request: a hung CLI must not get 2x the caller's timeout on the foreground /model path.
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session_deadline = time.monotonic() + timeout_seconds
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def _request(method: str, params: dict[str, Any], *, text_parts: list[str] | None = None,
|
|
reasoning_parts: list[str] | None = None) -> Any:
|
|
request_id = next(request_ids)
|
|
proc.stdin.write(json.dumps({"jsonrpc": "2.0", "id": request_id, "method": method, "params": params}) + "\n")
|
|
proc.stdin.flush()
|
|
deadline = session_deadline
|
|
while time.monotonic() < deadline and proc.poll() is None:
|
|
try:
|
|
msg = inbox.get(timeout=0.1)
|
|
except queue.Empty:
|
|
continue
|
|
if self._handle_server_message(
|
|
msg, process=proc, cwd=self._acp_cwd, text_parts=text_parts,
|
|
reasoning_parts=reasoning_parts, allow_file_requests=allow_file_requests,
|
|
) or msg.get("id") != request_id:
|
|
continue
|
|
if "error" in msg:
|
|
err = msg.get("error") or {}
|
|
raise RuntimeError(f"Copilot ACP {method} failed: {err.get('message') or err}")
|
|
return msg.get("result")
|
|
stderr_text = "\n".join(stderr_tail).strip()
|
|
if proc.poll() is not None and stderr_text:
|
|
if _is_gh_copilot_deprecation_message(stderr_text):
|
|
raise RuntimeError(_DEPRECATED_CLI_ERROR + stderr_text)
|
|
raise RuntimeError(f"Copilot ACP process exited early: {stderr_text}")
|
|
raise TimeoutError(f"Timed out waiting for Copilot ACP response to {method}.")
|
|
|
|
try:
|
|
_request("initialize", _INITIALIZE_PARAMS)
|
|
session = _request("session/new", {"cwd": self._acp_cwd, "mcpServers": []}) or {}
|
|
if not str(session.get("sessionId") or "").strip():
|
|
raise RuntimeError("Copilot ACP did not return a sessionId.")
|
|
yield session, _request
|
|
finally:
|
|
self.close()
|
|
|
|
def list_models(self, *, timeout_seconds: float = 15.0) -> list[str]:
|
|
"""Return the enabled models advertised by a short-lived authenticated ACP session."""
|
|
with self._session(timeout_seconds, allow_file_requests=False) as (session, _):
|
|
return _session_model_ids(session)
|
|
|
|
def _run_prompt(self, prompt_text: str, *, timeout_seconds: float, model: str | None = None) -> tuple[str, str]:
|
|
# The CLI's `--model` spawn flag is deliberately NOT used: `copilot --acp` validates it (unknown id
|
|
# aborts the spawn) but ignores it for the session; the model is applied after session/new instead.
|
|
requested_model = str(model or "").strip()
|
|
with self._session(timeout_seconds) as (session, _request):
|
|
session_id = str(session.get("sessionId") or "").strip()
|
|
if requested_model and requested_model != "copilot-acp":
|
|
try:
|
|
if (selection := _model_selection_request(session, requested_model)) is not None:
|
|
_request(*selection)
|
|
else:
|
|
logger.warning("Copilot ACP does not offer model %r; using the session default.", requested_model)
|
|
except Exception as exc:
|
|
logger.warning("Copilot ACP model selection for %r failed; continuing with the session default: %s", requested_model, exc)
|
|
text_parts: list[str] = []
|
|
reasoning_parts: list[str] = []
|
|
prompt = {"sessionId": session_id, "prompt": [{"type": "text", "text": prompt_text}]}
|
|
_request("session/prompt", prompt, text_parts=text_parts, reasoning_parts=reasoning_parts)
|
|
return "".join(text_parts), "".join(reasoning_parts)
|
|
|
|
def _handle_server_message(
|
|
self, msg: dict[str, Any], *, process: subprocess.Popen[str], cwd: str, text_parts: list[str] | None, reasoning_parts: list[str] | None,
|
|
allow_file_requests: bool = True,
|
|
) -> bool:
|
|
"""Consume a server->client message; True when handled (notification or request answered)."""
|
|
method = msg.get("method")
|
|
if not isinstance(method, str):
|
|
return False
|
|
if method == "session/update":
|
|
update = (msg.get("params") or {}).get("update") or {}
|
|
content = update.get("content") or {}
|
|
chunk_text = str(content.get("text") or "") if isinstance(content, dict) else ""
|
|
sinks = {"agent_message_chunk": text_parts, "agent_thought_chunk": reasoning_parts}
|
|
if chunk_text and (sink := sinks.get(str(update.get("sessionUpdate") or "").strip())) is not None:
|
|
sink.append(chunk_text)
|
|
return True
|
|
if process.stdin is None:
|
|
return True
|
|
message_id = msg.get("id")
|
|
if method == "session/request_permission":
|
|
response = _jsonrpc_result(message_id, {"outcome": {"outcome": "cancelled"}})
|
|
elif method in _FS_HANDLERS:
|
|
if not allow_file_requests:
|
|
response = _jsonrpc_error(message_id, -32601, "File access is unavailable during model discovery.")
|
|
else:
|
|
try:
|
|
response = _jsonrpc_result(message_id, _FS_HANDLERS[method](msg.get("params") or {}, cwd))
|
|
except Exception as exc:
|
|
response = _jsonrpc_error(message_id, -32602, str(exc))
|
|
else:
|
|
response = _jsonrpc_error(message_id, -32601, f"ACP client method '{method}' is not supported by Hermes yet.")
|
|
process.stdin.write(json.dumps(response) + "\n")
|
|
process.stdin.flush()
|
|
return True
|