252 lines
9.0 KiB
Python
252 lines
9.0 KiB
Python
"""Local execution environment with interrupt support and non-blocking I/O."""
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import os
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import platform
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import shutil
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import signal
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import subprocess
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import threading
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import time
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_IS_WINDOWS = platform.system() == "Windows"
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from tools.environments.base import BaseEnvironment
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# Unique marker to isolate real command output from shell init/exit noise.
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# printf (no trailing newline) keeps the boundaries clean for splitting.
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_OUTPUT_FENCE = "__HERMES_FENCE_a9f7b3__"
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def _find_shell() -> str:
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"""Find the best shell for command execution.
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On Unix: uses $SHELL, falls back to bash.
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On Windows: uses Git Bash (bundled with Git for Windows).
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Raises RuntimeError if no suitable shell is found on Windows.
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"""
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if not _IS_WINDOWS:
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return os.environ.get("SHELL") or shutil.which("bash") or "/bin/bash"
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# Windows: look for Git Bash (installed with Git for Windows).
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# Allow override via env var (same pattern as Claude Code).
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custom = os.environ.get("HERMES_GIT_BASH_PATH")
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if custom and os.path.isfile(custom):
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return custom
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# shutil.which finds bash.exe if Git\bin is on PATH
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found = shutil.which("bash")
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if found:
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return found
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# Check common Git for Windows install locations
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for candidate in (
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os.path.join(os.environ.get("ProgramFiles", r"C:\Program Files"), "Git", "bin", "bash.exe"),
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os.path.join(os.environ.get("ProgramFiles(x86)", r"C:\Program Files (x86)"), "Git", "bin", "bash.exe"),
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os.path.join(os.environ.get("LOCALAPPDATA", ""), "Programs", "Git", "bin", "bash.exe"),
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):
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if candidate and os.path.isfile(candidate):
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return candidate
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raise RuntimeError(
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"Git Bash not found. Hermes Agent requires Git for Windows on Windows.\n"
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"Install it from: https://git-scm.com/download/win\n"
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"Or set HERMES_GIT_BASH_PATH to your bash.exe location."
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)
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# Noise lines emitted by interactive shells when stdin is not a terminal.
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# Used as a fallback when output fence markers are missing.
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_SHELL_NOISE_SUBSTRINGS = (
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# bash
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"bash: cannot set terminal process group",
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"bash: no job control in this shell",
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"no job control in this shell",
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"cannot set terminal process group",
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"tcsetattr: Inappropriate ioctl for device",
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# zsh / oh-my-zsh / macOS terminal session
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"Restored session:",
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"Saving session...",
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"Last login:",
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"command not found:",
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"Oh My Zsh",
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"compinit:",
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)
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def _clean_shell_noise(output: str) -> str:
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"""Strip shell startup/exit warnings that leak when using -i without a TTY.
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Removes lines matching known noise patterns from both the beginning
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and end of the output. Lines in the middle are left untouched.
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"""
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def _is_noise(line: str) -> bool:
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return any(noise in line for noise in _SHELL_NOISE_SUBSTRINGS)
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lines = output.split("\n")
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# Strip leading noise
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while lines and _is_noise(lines[0]):
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lines.pop(0)
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# Strip trailing noise (walk backwards, skip empty lines from split)
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end = len(lines) - 1
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while end >= 0 and (not lines[end] or _is_noise(lines[end])):
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end -= 1
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if end < 0:
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return ""
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cleaned = lines[: end + 1]
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result = "\n".join(cleaned)
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# Preserve trailing newline if original had one
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if output.endswith("\n") and result and not result.endswith("\n"):
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result += "\n"
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return result
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def _extract_fenced_output(raw: str) -> str:
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"""Extract real command output from between fence markers.
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The execute() method wraps each command with printf(FENCE) markers.
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This function finds the first and last fence and returns only the
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content between them, which is the actual command output free of
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any shell init/exit noise.
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Falls back to pattern-based _clean_shell_noise if fences are missing.
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"""
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first = raw.find(_OUTPUT_FENCE)
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if first == -1:
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return _clean_shell_noise(raw)
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start = first + len(_OUTPUT_FENCE)
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last = raw.rfind(_OUTPUT_FENCE)
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if last <= first:
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# Only start fence found (e.g. user command called `exit`)
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return _clean_shell_noise(raw[start:])
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return raw[start:last]
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class LocalEnvironment(BaseEnvironment):
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"""Run commands directly on the host machine.
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Features:
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- Popen + polling for interrupt support (user can cancel mid-command)
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- Background stdout drain thread to prevent pipe buffer deadlocks
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- stdin_data support for piping content (bypasses ARG_MAX limits)
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- sudo -S transform via SUDO_PASSWORD env var
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- Uses interactive login shell so full user env is available
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"""
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def __init__(self, cwd: str = "", timeout: int = 60, env: dict = None):
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super().__init__(cwd=cwd or os.getcwd(), timeout=timeout, env=env)
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def execute(self, command: str, cwd: str = "", *,
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timeout: int | None = None,
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stdin_data: str | None = None) -> dict:
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from tools.terminal_tool import _interrupt_event
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work_dir = cwd or self.cwd or os.getcwd()
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effective_timeout = timeout or self.timeout
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exec_command = self._prepare_command(command)
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try:
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# Use the user's shell as an interactive login shell (-lic) so
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# that ALL rc files are sourced — including content after the
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# interactive guard in .bashrc (case $- in *i*)..esac) where
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# tools like nvm, pyenv, and cargo install their init scripts.
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# -l alone isn't enough: .profile sources .bashrc, but the guard
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# returns early because the shell isn't interactive.
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user_shell = _find_shell()
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# Wrap with output fences so we can later extract the real
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# command output and discard shell init/exit noise.
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fenced_cmd = (
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f"printf '{_OUTPUT_FENCE}';"
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f" {exec_command};"
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f" __hermes_rc=$?;"
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f" printf '{_OUTPUT_FENCE}';"
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f" exit $__hermes_rc"
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)
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proc = subprocess.Popen(
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[user_shell, "-lic", fenced_cmd],
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text=True,
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cwd=work_dir,
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env=os.environ | self.env,
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encoding="utf-8",
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errors="replace",
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stdout=subprocess.PIPE,
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stderr=subprocess.STDOUT,
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stdin=subprocess.PIPE if stdin_data is not None else subprocess.DEVNULL,
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preexec_fn=None if _IS_WINDOWS else os.setsid,
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)
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if stdin_data is not None:
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def _write_stdin():
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try:
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proc.stdin.write(stdin_data)
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proc.stdin.close()
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except (BrokenPipeError, OSError):
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pass
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threading.Thread(target=_write_stdin, daemon=True).start()
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_output_chunks: list[str] = []
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def _drain_stdout():
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try:
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for line in proc.stdout:
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_output_chunks.append(line)
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except ValueError:
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pass
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finally:
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try:
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proc.stdout.close()
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except Exception:
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pass
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reader = threading.Thread(target=_drain_stdout, daemon=True)
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reader.start()
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deadline = time.monotonic() + effective_timeout
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while proc.poll() is None:
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if _interrupt_event.is_set():
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try:
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if _IS_WINDOWS:
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proc.terminate()
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else:
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pgid = os.getpgid(proc.pid)
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os.killpg(pgid, signal.SIGTERM)
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try:
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proc.wait(timeout=1.0)
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except subprocess.TimeoutExpired:
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os.killpg(pgid, signal.SIGKILL)
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except (ProcessLookupError, PermissionError):
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proc.kill()
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reader.join(timeout=2)
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return {
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"output": "".join(_output_chunks) + "\n[Command interrupted — user sent a new message]",
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"returncode": 130,
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}
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if time.monotonic() > deadline:
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try:
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if _IS_WINDOWS:
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proc.terminate()
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else:
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os.killpg(os.getpgid(proc.pid), signal.SIGTERM)
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except (ProcessLookupError, PermissionError):
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proc.kill()
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reader.join(timeout=2)
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return self._timeout_result(effective_timeout)
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time.sleep(0.2)
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reader.join(timeout=5)
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output = _extract_fenced_output("".join(_output_chunks))
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return {"output": output, "returncode": proc.returncode}
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except Exception as e:
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return {"output": f"Execution error: {str(e)}", "returncode": 1}
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def cleanup(self):
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pass
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