775aedabce
Non-secret settings live in config.yaml: the extraction cap override becomes terminal.sync_back_max_bytes in DEFAULT_CONFIG (read via load_config() like the rest of the terminal section) and the HERMES_SYNC_BACK_MAX_BYTES env var goes away; docs and the cap tests follow. psutil is a pinned core dependency, so _temp_entry_owner_alive imports it unconditionally instead of guarding an ImportError that cannot happen.
486 lines
22 KiB
Python
486 lines
22 KiB
Python
"""Shared file sync manager for remote execution backends.
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Tracks local file changes via mtime+size, detects deletions, and syncs to
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remote environments transactionally. Used by SSH, Modal, and Daytona.
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Docker and Singularity use bind mounts (live host FS view) and don't need this.
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"""
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import hashlib
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import logging
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import os
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import posixpath
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import shlex
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import shutil
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import signal
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import tarfile
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import tempfile
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import threading
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import time
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try:
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import fcntl
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except ImportError:
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fcntl = None # Windows — file locking skipped
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from pathlib import Path
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from typing import Callable
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import psutil
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from hermes_constants import get_hermes_home
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from tools.environments.base import _file_mtime_key
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logger = logging.getLogger(__name__)
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# Tests patch these module-level aliases instead of ``time.sleep`` /
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# ``time.monotonic``: patching attributes on the shared ``time`` module object
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# leaks into unrelated threads under xdist and inflates retry call counts.
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_sleep = time.sleep
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_monotonic = time.monotonic
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_SYNC_INTERVAL_SECONDS = 5.0
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_FORCE_SYNC_ENV = "HERMES_FORCE_FILE_SYNC"
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# Transport callbacks provided by each backend
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UploadFn = Callable[[str, str], None] # (host_path, remote_path) -> raises on failure
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BulkUploadFn = Callable[[list[tuple[str, str]]], None] # [(host_path, remote_path), ...] -> raises on failure
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BulkDownloadFn = Callable[[Path], None] # (dest_tar_path) -> writes tar archive, raises on failure
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DeleteFn = Callable[[list[str]], None] # (remote_paths) -> raises on failure
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GetFilesFn = Callable[[], list[tuple[str, str]]] # () -> [(host_path, remote_path), ...]
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_SYNC_BACK_MAX_RETRIES = 3
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_SYNC_BACK_BACKOFF = (2, 4, 8) # seconds between retries
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_SYNC_BACK_MAX_BYTES = 2 * 1024 * 1024 * 1024 # 2 GiB — refuse to extract larger tars
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_SYNC_BACK_MAX_BYTES_KEY = "sync_back_max_bytes" # config.yaml terminal.<key>
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_SYNC_BACK_TEMP_PREFIX = "hermes-sync-back-"
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# A sync-back temp entry (the downloaded tar or the extraction staging dir) is only leaked by
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# a hard kill (SIGKILL/OOM/power loss — the ``finally`` never runs). Entry names embed the
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# owning PID, so a dead owner's entry is reclaimed at once; the age cutoff covers the rest
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# (live or recycled PIDs, pre-ownership names, Windows where a PID cannot be probed). The
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# download is bounded by a 120 s subprocess timeout, so a live transfer is minutes old at
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# most; the old 6 h window let a crash loop pile up tens of GB before anything was reclaimed.
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_SYNC_BACK_STALE_SECONDS = 30 * 60
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def _sync_back_max_bytes() -> int:
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"""Extraction cap; config.yaml ``terminal.sync_back_max_bytes`` overrides it for trees that
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legitimately exceed 2 GiB (a skipped extraction silently discards the whole download)."""
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from hermes_cli.config import load_config
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raw = ((load_config() or {}).get("terminal") or {}).get(_SYNC_BACK_MAX_BYTES_KEY)
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if raw is not None:
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try:
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return int(raw)
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except (TypeError, ValueError):
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logger.warning("sync_back: ignoring non-integer terminal.%s=%r", _SYNC_BACK_MAX_BYTES_KEY, raw)
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return _SYNC_BACK_MAX_BYTES
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def _sync_back_temp_prefix() -> str:
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"""Temp prefix embedding the owning PID so the stale sweep can tell a hard-killed
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process's leftovers from another live gateway's in-flight transfer without guessing
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from mtime (a staging dir's mtime does not move while content streams into it)."""
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return f"{_SYNC_BACK_TEMP_PREFIX}{os.getpid()}-"
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def _temp_entry_owner_alive(name: str) -> bool:
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"""Whether the process that created a sync-back temp entry may still be running.
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Names without a PID count as alive: the age cutoff applies."""
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pid_part = name[len(_SYNC_BACK_TEMP_PREFIX):].split("-", 1)[0]
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if not pid_part.isdigit():
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return True
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return psutil.pid_exists(int(pid_part))
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def _cleanup_stale_sync_back_temp(temp_dir: Path | None = None) -> int:
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"""Remove sync-back tars and staging dirs left behind by a hard-killed process.
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Only entries carrying this module's prefix are touched: at once when their owner PID
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is dead, otherwise only past ``_SYNC_BACK_STALE_SECONDS``. Returns the number of
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entries removed; a permission error or a race with another sync-back must not prevent
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the current one.
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"""
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directory = temp_dir or Path(tempfile.gettempdir())
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cutoff = time.time() - _SYNC_BACK_STALE_SECONDS
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removed = 0
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try:
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candidates = list(directory.glob(f"{_SYNC_BACK_TEMP_PREFIX}*"))
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except OSError:
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logger.debug("sync_back: could not scan temporary directory %s", directory)
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return 0
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for candidate in candidates:
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try:
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if candidate.is_symlink():
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continue
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if _temp_entry_owner_alive(candidate.name) and candidate.lstat().st_mtime >= cutoff:
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continue
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if candidate.is_dir():
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shutil.rmtree(candidate)
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else:
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candidate.unlink()
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removed += 1
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logger.debug("sync_back: removed stale temporary entry %s", candidate)
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except OSError:
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logger.debug("sync_back: could not remove stale temporary entry %s", candidate)
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return removed
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def iter_sync_files(container_base: str = "/root/.hermes") -> list[tuple[str, str]]:
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"""Enumerate all (host_path, remote_path) pairs to sync to a remote. Credential paths are
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remapped from the hardcoded /root/.hermes to *container_base* (remote home may differ)."""
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# Late import: credential_files pulls in agent modules (circular at module level).
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from tools.credential_files import get_credential_file_mounts, iter_cache_files, iter_skills_files
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files = [
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(entry["host_path"], entry["container_path"].replace("/root/.hermes", container_base, 1))
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for entry in get_credential_file_mounts()]
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files += [
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(entry["host_path"], entry["container_path"])
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for entry in (*iter_skills_files(container_base=container_base),
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*iter_cache_files(container_base=container_base))]
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return files
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def _resolve_host_path_str(host_path: str) -> str:
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"""Canonical string form of a host path (``resolve()`` falling back to ``expanduser()``)."""
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try:
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return str(Path(host_path).expanduser().resolve())
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except OSError:
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return str(Path(host_path).expanduser())
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def _credential_host_paths() -> set[str]:
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"""Return credential files that are upload-only for remote sandboxes."""
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try:
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from tools.credential_files import get_credential_file_mounts
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mounts = get_credential_file_mounts()
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except Exception:
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return set()
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return {
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_resolve_host_path_str(entry["host_path"])
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for entry in mounts if isinstance(entry, dict) and entry.get("host_path")}
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def quoted_rm_command(remote_paths: list[str]) -> str:
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"""Build a shell ``rm -f`` command for a batch of remote paths."""
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return "rm -f " + " ".join(shlex.quote(p) for p in remote_paths)
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def quoted_mkdir_command(dirs: list[str]) -> str:
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"""Build a shell ``mkdir -p`` command for a batch of directories."""
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return "mkdir -p " + " ".join(shlex.quote(d) for d in dirs)
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def unique_parent_dirs(files: list[tuple[str, str]]) -> list[str]:
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"""Extract sorted unique parent directories from (host, remote) pairs."""
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return sorted({posixpath.dirname(remote) for _, remote in files})
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def _sha256_file(path: str) -> str:
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"""Return hex SHA-256 digest of a file."""
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h = hashlib.sha256()
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with open(path, "rb") as f:
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for chunk in iter(lambda: f.read(65536), b""):
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h.update(chunk)
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return h.hexdigest()
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class FileSyncManager:
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"""Tracks local file changes and syncs to a remote environment. Backends supply transport
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callbacks (upload, delete) and a file-source callable; the manager handles mtime-based
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change detection, deletion tracking, rate limiting, and transactional state."""
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def __init__(
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self,
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get_files_fn: GetFilesFn,
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upload_fn: UploadFn,
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delete_fn: DeleteFn,
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sync_interval: float = _SYNC_INTERVAL_SECONDS,
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bulk_upload_fn: BulkUploadFn | None = None,
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bulk_download_fn: BulkDownloadFn | None = None):
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self._get_files_fn = get_files_fn
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self._upload_fn = upload_fn
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self._bulk_upload_fn = bulk_upload_fn
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self._bulk_download_fn = bulk_download_fn
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self._delete_fn = delete_fn
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self._transaction_lock = threading.Lock()
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self._synced_files: dict[str, tuple[float, int]] = {} # remote_path -> (mtime, size)
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self._pushed_hashes: dict[str, str] = {} # remote_path -> sha256 hex digest
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self._upload_only_host_paths: set[str] = set()
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self._last_sync_time: float = 0.0 # monotonic; 0 ensures first sync runs
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self._sync_interval = sync_interval
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def sync(self, *, force: bool = False) -> None:
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"""Run a sync cycle: upload changed files, delete removed files. Rate-limited to once
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per ``sync_interval`` unless *force* or ``HERMES_FORCE_FILE_SYNC=1``. Transactional:
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state is committed only if ALL operations succeed; on failure it rolls back so the
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next cycle retries everything."""
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with self._transaction_lock:
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self._sync_transaction(force=force)
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def _sync_transaction(self, *, force: bool = False) -> None:
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"""Execute one sync cycle while holding the per-manager lock."""
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if (
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not force
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and not os.environ.get(_FORCE_SYNC_ENV)
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and _monotonic() - self._last_sync_time < self._sync_interval):
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return
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current_files = self._get_files_fn()
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self._upload_only_host_paths.update(_credential_host_paths())
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to_upload, new_files, to_delete = self._plan_sync(current_files)
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if not to_upload and not to_delete:
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self._last_sync_time = _monotonic()
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return
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prev_files = dict(self._synced_files)
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prev_hashes = dict(self._pushed_hashes)
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try:
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# Hash and upload the same bytes: the original may be saved while
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# the transport is reading it or waiting for remote acknowledgement.
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with tempfile.TemporaryDirectory(prefix="hermes-sync-push-") as staging:
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staged_files = []
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pushed_hashes = {}
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for index, (host_path, remote_path) in enumerate(to_upload):
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staged_path = os.path.join(staging, str(index))
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shutil.copy2(host_path, staged_path)
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pushed_hashes[remote_path] = _sha256_file(staged_path)
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staged_files.append((staged_path, remote_path))
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self._push(staged_files, to_delete)
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# Commit (all succeeded).
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self._pushed_hashes.update(pushed_hashes)
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for p in to_delete:
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new_files.pop(p, None)
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self._pushed_hashes.pop(p, None)
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self._synced_files = new_files
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self._last_sync_time = _monotonic()
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except Exception as exc:
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self._synced_files = prev_files
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self._pushed_hashes = prev_hashes
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# Do NOT advance _last_sync_time: bumping the rate-limit clock on failure would
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# suppress the retry for up to _sync_interval, contradicting the retry contract.
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logger.warning("file_sync: sync failed, rolled back state: %s", exc)
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def _plan_sync(
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self, current_files: list[tuple[str, str]]
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) -> tuple[list[tuple[str, str]], dict[str, tuple[float, int]], list[str]]:
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"""Diff *current_files* against synced state -> ``(to_upload, new_synced_state, to_delete)``."""
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to_upload: list[tuple[str, str]] = []
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new_files = dict(self._synced_files)
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for host_path, remote_path in current_files:
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file_key = _file_mtime_key(host_path)
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if file_key is None or self._synced_files.get(remote_path) == file_key:
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continue
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to_upload.append((host_path, remote_path))
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new_files[remote_path] = file_key
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current_remote_paths = {remote for _, remote in current_files}
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to_delete = [p for p in self._synced_files if p not in current_remote_paths]
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return to_upload, new_files, to_delete
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def _push(self, to_upload: list[tuple[str, str]], to_delete: list[str]) -> None:
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"""Run the transport calls for one cycle (bulk upload when available)."""
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if to_upload:
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logger.debug("file_sync: uploading %d file(s)", len(to_upload))
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if to_delete:
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logger.debug("file_sync: deleting %d stale remote file(s)", len(to_delete))
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if to_upload and self._bulk_upload_fn is not None:
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self._bulk_upload_fn(to_upload)
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logger.debug("file_sync: bulk-uploaded %d file(s)", len(to_upload))
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else:
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for host_path, remote_path in to_upload:
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self._upload_fn(host_path, remote_path)
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logger.debug("file_sync: uploaded %s -> %s", host_path, remote_path)
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if to_delete:
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self._delete_fn(to_delete)
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logger.debug("file_sync: deleted %s", to_delete)
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# --- Sync-back: pull remote changes to host on teardown ---
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def sync_back(self, hermes_home: Path | None = None) -> None:
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"""Pull remote changes back to the host: download the remote ``.hermes/`` as a tar and
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apply only files whose SHA-256 differs from what was pushed. SIGINT is deferred until
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complete; concurrent gateway sandboxes are serialized via a file lock."""
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with self._transaction_lock:
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self._sync_back_transaction(hermes_home=hermes_home)
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def _sync_back_transaction(self, hermes_home: Path | None = None) -> None:
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"""Execute sync-back (with retries) against a stable snapshot of manager state."""
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if self._bulk_download_fn is None:
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return
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# Nothing was ever committed (initial push failed or never ran): skip
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# to avoid retry storms against an uninitialized remote .hermes/.
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if not self._pushed_hashes and not self._synced_files:
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logger.debug("sync_back: no prior push state — skipping")
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return
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lock_path = (hermes_home or get_hermes_home()) / ".sync.lock"
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lock_path.parent.mkdir(parents=True, exist_ok=True)
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last_exc: Exception | None = None
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for attempt in range(_SYNC_BACK_MAX_RETRIES):
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try:
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self._sync_back_once(lock_path)
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return
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except Exception as exc:
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last_exc = exc
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if attempt < _SYNC_BACK_MAX_RETRIES - 1:
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delay = _SYNC_BACK_BACKOFF[attempt]
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logger.warning("sync_back: attempt %d failed (%s), retrying in %ds", attempt + 1, exc, delay)
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_sleep(delay)
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logger.warning("sync_back: all %d attempts failed: %s", _SYNC_BACK_MAX_RETRIES, last_exc)
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def _sync_back_once(self, lock_path: Path) -> None:
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"""Single sync-back attempt with SIGINT protection and file lock."""
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# signal.signal() only works from the main thread; gateway cleanup()
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# may run from a worker thread — skip SIGINT deferral there.
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on_main_thread = threading.current_thread() is threading.main_thread()
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deferred_sigint: list[object] = []
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original_handler = None
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if on_main_thread:
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original_handler = signal.getsignal(signal.SIGINT)
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def _defer_sigint(signum, frame):
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deferred_sigint.append((signum, frame))
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logger.debug("sync_back: SIGINT deferred until sync completes")
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signal.signal(signal.SIGINT, _defer_sigint)
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try:
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self._sync_back_locked(lock_path)
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finally:
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if on_main_thread and original_handler is not None:
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signal.signal(signal.SIGINT, original_handler)
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if deferred_sigint:
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# Re-deliver the deferred Ctrl+C to the restored handler. ``os.kill(os.getpid(),
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# SIGINT)`` is NOT graceful on Windows (routes to TerminateProcess, hard-killing
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# the CLI); ``raise_signal`` invokes the handler everywhere.
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signal.raise_signal(signal.SIGINT)
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def _sync_back_locked(self, lock_path: Path) -> None:
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"""Sync-back under file lock (serializes concurrent gateways)."""
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if fcntl is None:
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# Windows: no flock — run without serialization
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self._sync_back_impl()
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return
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lock_fd = open(lock_path, "w", encoding="utf-8")
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try:
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fcntl.flock(lock_fd, fcntl.LOCK_EX)
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self._sync_back_impl()
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finally:
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try:
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fcntl.flock(lock_fd, fcntl.LOCK_UN)
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except (OSError, IOError):
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pass
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lock_fd.close()
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def _sync_back_impl(self) -> None:
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"""Download, diff, and apply remote changes to host."""
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if self._bulk_download_fn is None:
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raise RuntimeError("_sync_back_impl called without bulk_download_fn")
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# Cache file mapping once to avoid O(n*m) from repeated iteration
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try:
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file_mapping = list(self._get_files_fn())
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except Exception:
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file_mapping = []
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# A hard kill bypasses the finally below. Reclaim only old entries carrying our
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# prefix before allocating another full-tree download.
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_cleanup_stale_sync_back_temp()
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# mkstemp + close: NamedTemporaryFile keeps an exclusive handle on Windows, so the
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# backend's open(dest, "wb") / write_bytes on the same path raised PermissionError.
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fd, tar_path = tempfile.mkstemp(prefix=_sync_back_temp_prefix(), suffix=".tar")
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os.close(fd)
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try:
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self._bulk_download_fn(Path(tar_path))
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# A misbehaving sandbox could produce an arbitrarily large tar.
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try:
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tar_size = os.path.getsize(tar_path)
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except OSError:
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tar_size = 0
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max_bytes = _sync_back_max_bytes()
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if tar_size > max_bytes:
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logger.warning(
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"sync_back: remote tar is %d bytes (cap %d, override with terminal.%s) — skipping extraction",
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tar_size, max_bytes, _SYNC_BACK_MAX_BYTES_KEY)
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return
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with tempfile.TemporaryDirectory(prefix=_sync_back_temp_prefix()) as staging:
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with tarfile.open(tar_path) as tar:
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tar.extractall(staging, filter="data")
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upload_only = self._upload_only_host_paths | _credential_host_paths()
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applied = 0
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for dirpath, _dirnames, filenames in os.walk(staging):
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for fname in filenames:
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staged_file = os.path.join(dirpath, fname)
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# Remote keys are POSIX; relpath uses host separators (backslashes on Windows).
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remote_path = "/" + Path(os.path.relpath(staged_file, staging)).as_posix()
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|
applied += self._apply_staged_file(staged_file, remote_path, file_mapping, upload_only)
|
|
|
|
if applied:
|
|
logger.info("sync_back: applied %d changed file(s)", applied)
|
|
else:
|
|
logger.debug("sync_back: no remote changes detected")
|
|
finally:
|
|
try:
|
|
os.unlink(tar_path)
|
|
except OSError:
|
|
pass
|
|
|
|
def _apply_staged_file(
|
|
self, staged_file: str, remote_path: str, file_mapping: list[tuple[str, str]], upload_only_host_paths: set[str],
|
|
) -> int:
|
|
"""Copy one extracted remote file onto the host if it changed since push. Returns 1 if
|
|
applied, 0 if skipped (unchanged, unmapped, or an upload-only credential). A host file
|
|
modified since push is overwritten with the remote version (last-write-wins) with a warning."""
|
|
pushed_hash = self._pushed_hashes.get(remote_path)
|
|
if pushed_hash is not None and _sha256_file(staged_file) == pushed_hash:
|
|
return 0 # unchanged from push
|
|
|
|
host_path = self._resolve_host_path(remote_path, file_mapping)
|
|
if host_path is None:
|
|
host_path = self._infer_host_path(remote_path, file_mapping, upload_only_host_paths=upload_only_host_paths)
|
|
if host_path is None:
|
|
logger.debug("sync_back: skipping %s (no host mapping)", remote_path)
|
|
return 0
|
|
|
|
if self._is_upload_only_host_path(host_path, upload_only_host_paths):
|
|
logger.debug("sync_back: skipping upload-only credential file %s", remote_path)
|
|
return 0
|
|
|
|
if pushed_hash is not None and os.path.exists(host_path) and _sha256_file(host_path) != pushed_hash:
|
|
logger.warning(
|
|
"sync_back: conflict on %s — host modified "
|
|
"since push, remote also changed. Applying remote version (last-write-wins).",
|
|
remote_path)
|
|
|
|
os.makedirs(os.path.dirname(host_path), exist_ok=True)
|
|
shutil.copy2(staged_file, host_path)
|
|
return 1
|
|
|
|
def _resolve_host_path(self, remote_path: str, file_mapping: list[tuple[str, str]] | None = None) -> str | None:
|
|
"""Find the host path for a known remote path from the file mapping."""
|
|
return next((host for host, remote in file_mapping or [] if remote == remote_path), None)
|
|
|
|
def _infer_host_path(self, remote_path: str, file_mapping: list[tuple[str, str]] | None = None, *,
|
|
upload_only_host_paths: set[str] | None = None) -> str | None:
|
|
"""Infer a host path for a new remote file by matching path prefixes: an existing
|
|
remote->host pair whose parent directory prefixes *remote_path* gets the same
|
|
substitution (``/root/.hermes/skills/b.md`` -> ``~/.hermes/skills/b.md``)."""
|
|
upload_only_host_paths = upload_only_host_paths or set()
|
|
for host, remote in file_mapping or []:
|
|
if self._is_upload_only_host_path(host, upload_only_host_paths):
|
|
continue
|
|
remote_dir = posixpath.dirname(remote) # remote paths are POSIX even on a Windows host
|
|
if remote_path.startswith(remote_dir + "/"):
|
|
return str(Path(host).parent / remote_path[len(remote_dir) + 1:])
|
|
return None
|
|
|
|
@staticmethod
|
|
def _is_upload_only_host_path(host_path: str, upload_only_host_paths: set[str]) -> bool:
|
|
return _resolve_host_path_str(host_path) in upload_only_host_paths
|