mirror of
https://github.com/NousResearch/hermes-agent.git
synced 2026-05-03 01:07:31 +08:00
49d1390b40
Previously, _wrap_command() wrote pwd to a file on the remote (container, sandbox, SSH host), then _update_cwd_from_file() read it back via another _run_bash() call. On Modal/Daytona this was a full API round-trip just to read 20 bytes. Now the wrapping template echoes the cwd to stdout with markers: printf '\n__HERMES_CWD__%s__HERMES_CWD__\n' "$(pwd -P)" _extract_cwd_from_output() parses it from the output already in memory. Zero extra round-trips on any backend. The cwdfile, _read_file_in_env(), and per-backend overrides are all deleted. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
207 lines
8.6 KiB
Python
207 lines
8.6 KiB
Python
"""SSH remote execution environment with ControlMaster connection persistence."""
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import logging
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import shlex
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import shutil
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import subprocess
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import tempfile
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from pathlib import Path
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from tools.environments.base import BaseEnvironment
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logger = logging.getLogger(__name__)
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def _ensure_ssh_available() -> None:
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"""Fail fast with a clear error when the SSH client is unavailable."""
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if not shutil.which("ssh"):
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raise RuntimeError(
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"SSH is not installed or not in PATH. Install OpenSSH client: apt install openssh-client"
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)
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class SSHEnvironment(BaseEnvironment):
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"""Run commands on a remote machine over SSH.
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Uses SSH ControlMaster for connection persistence so subsequent
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commands are fast. Security benefit: the agent cannot modify its
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own code since execution happens on a separate machine.
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Foreground commands are interruptible: the local ssh process is killed
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and a remote kill is attempted over the ControlMaster socket.
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Uses the unified spawn-per-call model:
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- bash -l once at session start to capture env snapshot on the remote
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- bash -c for every subsequent command (fast, no shell init overhead)
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- CWD tracked via cwdfile written after each command on the remote host
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"""
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def __init__(self, host: str, user: str, cwd: str = "~",
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timeout: int = 60, port: int = 22, key_path: str = "",
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**kwargs):
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super().__init__(cwd=cwd, timeout=timeout)
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self.host = host
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self.user = user
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self.port = port
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self.key_path = key_path
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self.control_dir = Path(tempfile.gettempdir()) / "hermes-ssh"
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self.control_dir.mkdir(parents=True, exist_ok=True)
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self.control_socket = self.control_dir / f"{user}@{host}:{port}.sock"
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_ensure_ssh_available()
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self._establish_connection()
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self._remote_home = self._detect_remote_home()
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self._sync_skills_and_credentials()
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self.init_session()
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def _build_ssh_command(self, extra_args: list | None = None) -> list:
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cmd = ["ssh"]
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cmd.extend(["-o", f"ControlPath={self.control_socket}"])
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cmd.extend(["-o", "ControlMaster=auto"])
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cmd.extend(["-o", "ControlPersist=300"])
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cmd.extend(["-o", "BatchMode=yes"])
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cmd.extend(["-o", "StrictHostKeyChecking=accept-new"])
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cmd.extend(["-o", "ConnectTimeout=10"])
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if self.port != 22:
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cmd.extend(["-p", str(self.port)])
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if self.key_path:
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cmd.extend(["-i", self.key_path])
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if extra_args:
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cmd.extend(extra_args)
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cmd.append(f"{self.user}@{self.host}")
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return cmd
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def _establish_connection(self):
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cmd = self._build_ssh_command()
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cmd.append("echo 'SSH connection established'")
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try:
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result = subprocess.run(cmd, capture_output=True, text=True, timeout=15)
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if result.returncode != 0:
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error_msg = result.stderr.strip() or result.stdout.strip()
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raise RuntimeError(f"SSH connection failed: {error_msg}")
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except subprocess.TimeoutExpired:
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raise RuntimeError(f"SSH connection to {self.user}@{self.host} timed out")
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def _detect_remote_home(self) -> str:
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"""Detect the remote user's home directory."""
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try:
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cmd = self._build_ssh_command()
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cmd.append("echo $HOME")
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result = subprocess.run(cmd, capture_output=True, text=True, timeout=10)
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home = result.stdout.strip()
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if home and result.returncode == 0:
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logger.debug("SSH: remote home = %s", home)
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return home
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except Exception:
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pass
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# Fallback: guess from username
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if self.user == "root":
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return "/root"
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return f"/home/{self.user}"
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def _sync_skills_and_credentials(self) -> None:
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"""Rsync skills directory and credential files to the remote host."""
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try:
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container_base = f"{self._remote_home}/.hermes"
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from tools.credential_files import get_credential_file_mounts, get_skills_directory_mount
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rsync_base = ["rsync", "-az", "--timeout=30", "--safe-links"]
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ssh_opts = f"ssh -o ControlPath={self.control_socket} -o ControlMaster=auto"
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if self.port != 22:
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ssh_opts += f" -p {self.port}"
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if self.key_path:
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ssh_opts += f" -i {self.key_path}"
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rsync_base.extend(["-e", ssh_opts])
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dest_prefix = f"{self.user}@{self.host}"
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# Sync individual credential files (remap /root/.hermes to detected home)
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for mount_entry in get_credential_file_mounts():
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remote_path = mount_entry["container_path"].replace("/root/.hermes", container_base, 1)
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parent_dir = str(Path(remote_path).parent)
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mkdir_cmd = self._build_ssh_command()
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mkdir_cmd.append(f"mkdir -p {parent_dir}")
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subprocess.run(mkdir_cmd, capture_output=True, text=True, timeout=10)
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cmd = rsync_base + [mount_entry["host_path"], f"{dest_prefix}:{remote_path}"]
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result = subprocess.run(cmd, capture_output=True, text=True, timeout=30)
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if result.returncode == 0:
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logger.info("SSH: synced credential %s -> %s", mount_entry["host_path"], remote_path)
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else:
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logger.debug("SSH: rsync credential failed: %s", result.stderr.strip())
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# Sync skills directory (remap to detected home)
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skills_mount = get_skills_directory_mount(container_base=container_base)
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if skills_mount:
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remote_path = skills_mount["container_path"]
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mkdir_cmd = self._build_ssh_command()
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mkdir_cmd.append(f"mkdir -p {remote_path}")
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subprocess.run(mkdir_cmd, capture_output=True, text=True, timeout=10)
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cmd = rsync_base + [
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skills_mount["host_path"].rstrip("/") + "/",
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f"{dest_prefix}:{remote_path}/",
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]
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result = subprocess.run(cmd, capture_output=True, text=True, timeout=60)
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if result.returncode == 0:
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logger.info("SSH: synced skills dir %s -> %s", skills_mount["host_path"], remote_path)
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else:
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logger.debug("SSH: rsync skills dir failed: %s", result.stderr.strip())
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except Exception as e:
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logger.debug("SSH: could not sync skills/credentials: %s", e)
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# ------------------------------------------------------------------
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# Unified execution hooks
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# ------------------------------------------------------------------
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def _before_execute(self):
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"""Incremental sync before each command so mid-session credential
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refreshes and skill updates are picked up."""
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self._sync_skills_and_credentials()
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def _run_bash(self, cmd_string, *, stdin_data=None):
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cmd = self._build_ssh_command()
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cmd.extend(["bash", "-c", shlex.quote(cmd_string)])
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proc = subprocess.Popen(
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cmd,
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stdout=subprocess.PIPE, stderr=subprocess.STDOUT,
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stdin=subprocess.PIPE if stdin_data is not None else subprocess.DEVNULL,
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text=True,
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)
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if stdin_data:
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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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return proc
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def _run_bash_login(self, cmd_string):
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cmd = self._build_ssh_command()
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cmd.extend(["bash", "-l", "-c", shlex.quote(cmd_string)])
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return subprocess.Popen(
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cmd, stdout=subprocess.PIPE, stderr=subprocess.STDOUT,
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stdin=subprocess.DEVNULL, text=True,
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)
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def cleanup(self):
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# Clean up remote snapshot before closing ControlMaster
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if self._snapshot_path:
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paths = self._snapshot_path
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try:
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cmd = self._build_ssh_command()
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cmd.append(f"rm -f {paths}")
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subprocess.run(cmd, capture_output=True, timeout=5)
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except Exception:
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pass
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super().cleanup()
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if self.control_socket.exists():
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try:
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cmd = ["ssh", "-o", f"ControlPath={self.control_socket}",
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"-O", "exit", f"{self.user}@{self.host}"]
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subprocess.run(cmd, capture_output=True, timeout=5)
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except (OSError, subprocess.SubprocessError):
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pass
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try:
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self.control_socket.unlink()
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except OSError:
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pass
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