Teknium
679 lines
23 KiB
Python
679 lines
23 KiB
Python
"""Detect Git operations that can rewrite the checkout backing this process."""
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from __future__ import annotations
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import os
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import re
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import shlex
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import subprocess
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from dataclasses import dataclass, field
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from pathlib import Path
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from typing import Callable
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from tools.approval import (
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_bash_exec_payload,
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_deobfuscate_shell_word_for_detection,
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_iter_shell_command_starts,
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_read_shell_word,
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)
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# bisect is included: it drives repeated checkouts of the running root — the
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# exact module-version-skew hazard this guard exists for.
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_WORKTREE_MUTATIONS = frozenset({
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"checkout", "switch", "rebase", "merge", "pull", "restore", "clean",
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"cherry-pick", "revert", "bisect",
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})
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_WORKTREE_TARGET_ACTIONS = frozenset({"move", "remove"})
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_STASH_SAFE_ACTIONS = frozenset({"list", "show", "create", "store", "drop", "clear"})
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_RESET_WORKTREE_MODES = frozenset({"--hard", "--merge", "--keep"})
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# `reset`/`stash`/`clean`/`restore` reach this set only in their SAFE forms
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# (_mutates_worktree classifies the dangerous forms first in _inspect_git);
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# listing them only avoids a pointless `git config --get alias.<sub>`
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# subprocess for `stash list`, `reset --soft`, `clean -n`, `restore --staged`.
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_KNOWN_GIT_BUILTINS = frozenset({
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"add", "am", "apply", "blame", "branch", "bundle", "cat-file", "clean",
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"clone", "commit", "config", "describe", "diff", "fetch", "format-patch",
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"grep", "help", "init", "log", "ls-files", "ls-remote", "ls-tree",
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"maintenance", "merge-base", "mv", "notes", "push", "range-diff", "reflog",
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"remote", "repack", "replace", "reset", "restore", "rev-list", "rev-parse",
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"rm", "shortlog", "show", "show-ref", "stash", "status", "submodule", "tag",
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"worktree",
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})
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_SHELL_EXECUTABLES = frozenset({"bash", "dash", "ksh", "sh", "zsh"})
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_ASSIGNMENT_RE = re.compile(r"[A-Za-z_][A-Za-z0-9_]*=(.*)", re.DOTALL)
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_RESET_HARD_RE = re.compile(r"--h(?:a(?:r(?:d)?)?)?\Z")
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_NO_OPTIONS: frozenset[str] = frozenset()
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# Wrapper executables that are skipped to reach the real command, mapped to
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# the options that consume a following argument.
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_WRAPPER_OPTIONS_WITH_ARG: dict[str, frozenset[str]] = {
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"sudo": frozenset({
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"-C", "--chdir", "-c", "--close-from", "-g", "--group", "-h", "--host",
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"-p", "--prompt", "-R", "--chroot", "-T", "--command-timeout", "-u", "--user",
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}),
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"env": frozenset({
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"-a", "--argv0", "-C", "--chdir", "-S", "--split-string", "-u", "--unset",
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}),
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"command": _NO_OPTIONS,
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"builtin": _NO_OPTIONS,
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"exec": frozenset({"-a"}),
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"nohup": _NO_OPTIONS,
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"setsid": _NO_OPTIONS,
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"time": frozenset({"-f", "--format", "-o", "--output"}),
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}
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_MAX_RECURSION = 4
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# git global options that consume the next argument (-C/--work-tree/-c are acted on).
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_GIT_GLOBAL_OPTIONS_WITH_ARG = frozenset({
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"-C", "-c", "--work-tree", "--git-dir", "--namespace", "--exec-path",
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})
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@dataclass
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class _Heredoc:
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delimiter: str
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strip_tabs: bool
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execute_as_shell: bool
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body: list[str] = field(default_factory=list)
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@dataclass
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class _ShellContext:
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kind: str
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opener: int
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quote: str | None = None
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def get_running_source_root() -> Path | None:
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"""Return the source checkout backing this process, if there is one."""
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try:
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root = Path(__file__).resolve().parent.parent
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except (OSError, RuntimeError):
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return None
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return root if (root / ".git").exists() else None
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def _resolve(path_str: str, base: Path) -> Path:
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path = Path(os.path.expanduser(path_str))
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if not path.is_absolute():
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path = base / path
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try:
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return path.resolve()
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except (OSError, RuntimeError, ValueError):
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return path
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def _is_within(path: Path, root: Path) -> bool:
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try:
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return path == root or path.is_relative_to(root)
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except (OSError, RuntimeError, ValueError):
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return False
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def _executable_name(value: str) -> str:
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return Path(value.replace("\\", "/")).name.removesuffix(".exe").lower()
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def _shell_words_at(command: str, start: int) -> list[str]:
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words: list[str] = []
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cursor = start
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for _ in range(64):
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word_start, word_end, raw_word = _read_shell_word(command, cursor)
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if word_start == word_end:
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break
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if words and "\n" in command[cursor:word_start]:
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break
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words.append(_deobfuscate_shell_word_for_detection(raw_word))
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cursor = word_end
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return words
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def _consume_options(
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words: list[str],
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start: int,
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options_with_arg: frozenset[str] = _NO_OPTIONS,
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) -> int:
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"""Index of the first positional at/after ``start`` (``--`` ends options)."""
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index = start
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while index < len(words):
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option = words[index]
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if option == "--":
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return index + 1
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if not option.startswith("-") or option == "-":
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break
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option_name = option.split("=", 1)[0]
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if "=" not in option and option_name in options_with_arg:
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index += 2
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else:
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index += 1
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return index
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def _command_parts(words: list[str]) -> tuple[dict[str, str], str | None, list[str]]:
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"""Split leading VAR=value assignments and wrappers off -> (env, executable, args)."""
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env: dict[str, str] = {}
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index = 0
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while index < len(words):
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if _ASSIGNMENT_RE.fullmatch(words[index]):
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name, value = words[index].split("=", 1)
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env[name] = value
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index += 1
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continue
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executable = _executable_name(words[index])
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wrapper_options = _WRAPPER_OPTIONS_WITH_ARG.get(executable)
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if wrapper_options is None:
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return env, words[index], words[index + 1 :]
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# `command -v/-V` only reports; nothing runs.
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if executable == "command" and words[index + 1 : index + 2] in (["-v"], ["-V"]):
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return env, None, []
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index = _consume_options(words, index + 1, wrapper_options)
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return env, None, []
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def _scope_keys(command: str, starts: list[int]) -> dict[int, tuple[int, ...]]:
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"""Map each command start to the tuple of enclosing ``(``/``$(``/backtick openers."""
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contexts = [_ShellContext("root", -1)]
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scopes: dict[int, tuple[int, ...]] = {}
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cursor = 0
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for start in sorted(set(starts)):
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while cursor < start:
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context = contexts[-1]
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quote = context.quote
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char = command[cursor]
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if quote == "'":
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if char == "'":
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context.quote = None
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cursor += 1
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continue
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# Unquoted or inside double quotes: substitutions still open scopes.
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if char == "\\" and cursor + 1 < start:
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cursor += 2
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continue
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if quote == '"':
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if char == '"':
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context.quote = None
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cursor += 1
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continue
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elif char in {"'", '"'}:
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context.quote = char
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cursor += 1
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continue
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if command.startswith("$(", cursor):
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contexts.append(_ShellContext("$(", cursor))
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cursor += 2
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continue
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if quote is None:
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if char == "(":
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contexts.append(_ShellContext("(", cursor))
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cursor += 1
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continue
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if char == ")" and len(contexts) > 1 and contexts[-1].kind in {"(", "$("}:
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contexts.pop()
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cursor += 1
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continue
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if char == "`":
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if quote is None and len(contexts) > 1 and contexts[-1].kind == "`":
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contexts.pop()
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else:
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contexts.append(_ShellContext("`", cursor))
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cursor += 1
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scopes[start] = tuple(item.opener for item in contexts[1:])
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return scopes
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def _operator_before(command: str, start: int) -> str | None:
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index = start - 1
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saw_newline = False
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while index >= 0 and command[index].isspace():
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saw_newline = saw_newline or command[index] == "\n"
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index -= 1
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if index < 0:
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return "\n" if saw_newline else None
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if index > 0 and command[index - 1 : index + 1] in {"&&", "||"}:
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return command[index - 1 : index + 1]
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if command[index] in {";", "|", "&", "(", "{"}:
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return command[index]
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return "\n" if saw_newline else None
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def _cd_target(executable: str, args: list[str], cwd: Path) -> Path | None:
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if _executable_name(executable) not in {"cd", "pushd"}:
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return None
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index = _consume_options(args, 0)
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if index >= len(args) or args[index] == "-":
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return None
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target = _resolve(args[index], cwd)
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return target if target.is_dir() else None
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def _shell_script_arg(args: list[str]) -> str | None:
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"""Return the script string owned by a shell's ``-c``, if present.
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approval.py's ``_bash_exec_payload`` parses bash's real option grammar
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(``-o pipefail -c '<script>'`` hides ``-c`` behind an operand). When it
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finds no ``-c``, fall back to a permissive positional scan because
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zsh/dash/ksh option letters (``zsh -yc``) fall outside bash's alphabet and
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would otherwise make this block-guard fail open.
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"""
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has_c, payload = _bash_exec_payload(args)
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if has_c:
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return payload
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for index, arg in enumerate(args):
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if arg == "--":
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break
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if arg.startswith("-") and "c" in arg[1:]:
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return args[index + 1] if index + 1 < len(args) else None
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if not arg.startswith("-"):
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break
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return None
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def _heredoc_specs(line: str) -> list[_Heredoc]:
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"""Heredoc openers on one line; ``execute_as_shell`` when a bare shell consumes the body."""
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specs: list[_Heredoc] = []
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quote: str | None = None
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index = 0
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while index < len(line):
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char = line[index]
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if quote:
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if char == "\\" and quote == '"' and index + 1 < len(line):
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index += 2
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continue
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if char == quote:
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quote = None
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index += 1
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continue
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if char in {"'", '"'}:
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quote = char
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index += 1
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continue
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if not line.startswith("<<", index) or line.startswith("<<<", index):
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index += 1
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continue
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operator_at = index
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index += 2
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strip_tabs = index < len(line) and line[index] == "-"
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if strip_tabs:
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index += 1
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while index < len(line) and line[index] in {" ", "\t"}:
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index += 1
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if index >= len(line):
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break
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delimiter_quote = line[index] if line[index] in {"'", '"'} else None
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if delimiter_quote:
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index += 1
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end = line.find(delimiter_quote, index)
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if end == -1:
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break
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delimiter = line[index:end]
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index = end + 1
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else:
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end = index
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while (
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end < len(line) and not line[end].isspace() and line[end] not in ";|&<>"
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):
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end += 1
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delimiter = line[index:end]
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index = end
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if not delimiter:
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continue
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header = line[:operator_at]
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starts = list(_iter_shell_command_starts(header))
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words = _shell_words_at(header, starts[-1]) if starts else []
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_, executable, args = _command_parts(words)
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execute_as_shell = bool(
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executable
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and _executable_name(executable) in _SHELL_EXECUTABLES
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and _shell_script_arg(args) is None
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and not any(arg and not arg.startswith("-") for arg in args)
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)
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specs.append(_Heredoc(delimiter, strip_tabs, execute_as_shell))
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return specs
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def _masked_line(line: str) -> str:
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return "".join(char if char in {"\r", "\n"} else " " for char in line)
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def _mask_heredocs(command: str) -> tuple[str, list[str]]:
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"""Blank heredoc bodies; return (masked command, bodies a bare shell would execute).
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Unterminated heredocs run to end of input and are still reported.
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"""
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output: list[str] = []
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pending: list[_Heredoc] = []
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finished: list[_Heredoc] = []
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for line in command.splitlines(keepends=True):
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if pending:
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current = pending[0]
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candidate = line.rstrip("\r\n")
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if current.strip_tabs:
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candidate = candidate.lstrip("\t")
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if candidate == current.delimiter:
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finished.append(pending.pop(0))
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else:
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current.body.append(line)
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output.append(_masked_line(line))
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continue
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output.append(line)
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pending.extend(_heredoc_specs(line))
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shell_scripts = ["".join(spec.body) for spec in finished + pending if spec.execute_as_shell]
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return "".join(output), shell_scripts
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def _record_alias(config: str, aliases: dict[str, str]) -> None:
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"""Record an inline ``-c alias.<name>=<value>`` git config override."""
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if config.lower().startswith("alias.") and "=" in config:
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key, value = config.split("=", 1)
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aliases[key[6:].lower()] = value
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def _git_target_and_subcommand(
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args: list[str],
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current_dir: Path,
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env: dict[str, str],
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) -> tuple[Path, str | None, list[str], dict[str, str]]:
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"""Parse git's global options -> (target dir, subcommand, sub args, inline aliases)."""
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target = current_dir
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work_tree: str | None = None
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aliases: dict[str, str] = {}
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index = 0
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while index < len(args):
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arg = args[index]
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if arg == "--":
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index += 1
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break
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if not arg.startswith("-"):
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break
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if arg in _GIT_GLOBAL_OPTIONS_WITH_ARG:
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if index + 1 < len(args):
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value = args[index + 1]
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if arg == "-C":
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target = _resolve(value, target)
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elif arg == "--work-tree":
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work_tree = value
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elif arg == "-c":
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_record_alias(value, aliases)
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index += 2
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continue
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if arg.startswith("-C") and len(arg) > 2:
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target = _resolve(arg[2:], target)
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elif arg.startswith("--work-tree="):
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work_tree = arg.split("=", 1)[1]
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elif arg.startswith("-calias."):
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_record_alias(arg[2:], aliases)
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index += 1
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explicit_work_tree = work_tree or env.get("GIT_WORK_TREE")
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if explicit_work_tree:
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target = _resolve(explicit_work_tree, target)
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subcommand = args[index].lower() if index < len(args) else None
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return target, subcommand, args[index + 1 :], aliases
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def _has_short_flag(arg: str, letter: str) -> bool:
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return arg.startswith("-") and letter in arg[1:]
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def _reset_mutates(args: list[str]) -> bool:
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return any(arg in _RESET_WORKTREE_MODES or _RESET_HARD_RE.fullmatch(arg) for arg in args)
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def _stash_mutates(args: list[str]) -> bool:
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action = next((arg for arg in args if not arg.startswith("-")), "push")
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return action not in _STASH_SAFE_ACTIONS
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def _clean_mutates(args: list[str]) -> bool:
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return not any(
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arg == "--dry-run" or (not arg.startswith("--") and _has_short_flag(arg, "n"))
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for arg in args
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)
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def _restore_mutates(args: list[str]) -> bool:
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staged = any(arg == "--staged" or _has_short_flag(arg, "S") for arg in args)
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worktree = any(arg == "--worktree" or _has_short_flag(arg, "W") for arg in args)
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return worktree or not staged
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# Subcommands whose worktree impact depends on their arguments.
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_CONDITIONAL_MUTATIONS: dict[str, Callable[[list[str]], bool]] = {
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"reset": _reset_mutates,
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"stash": _stash_mutates,
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"clean": _clean_mutates,
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"restore": _restore_mutates,
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}
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def _mutates_worktree(subcommand: str, args: list[str]) -> bool:
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check = _CONDITIONAL_MUTATIONS.get(subcommand)
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if check is not None:
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return check(args)
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return subcommand in _WORKTREE_MUTATIONS
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def _inspect_git_worktree(args: list[str], cwd: Path, root: Path) -> str | None:
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"""Block `worktree remove|move` aimed at the running root, from any directory."""
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action_index = _consume_options(args, 0)
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if action_index >= len(args):
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return None
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action = args[action_index].lower()
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if action not in _WORKTREE_TARGET_ACTIONS:
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return None
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target_index = _consume_options(args, action_index + 1)
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if target_index >= len(args):
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return None
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if _resolve(args[target_index], cwd) == root:
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return f"git worktree {action}"
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return None
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def _read_git_alias(executable: str, target: Path, alias: str) -> str | None:
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try:
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result = subprocess.run(
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[executable, "-C", str(target), "config", "--get", f"alias.{alias}"],
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capture_output=True,
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text=True,
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timeout=1,
|
|
check=False,
|
|
)
|
|
except (OSError, subprocess.SubprocessError):
|
|
return None
|
|
value = result.stdout.strip()
|
|
return value if result.returncode == 0 and value else None
|
|
|
|
|
|
def _inspect_git(
|
|
executable: str,
|
|
args: list[str],
|
|
current_dir: Path,
|
|
env: dict[str, str],
|
|
root: Path,
|
|
depth: int,
|
|
) -> str | None:
|
|
target, subcommand, sub_args, inline_aliases = _git_target_and_subcommand(
|
|
args, current_dir, env
|
|
)
|
|
if subcommand is None:
|
|
return None
|
|
# `worktree` names its victim as an argument, so the cwd check does not apply.
|
|
if subcommand == "worktree":
|
|
return _inspect_git_worktree(sub_args, target, root)
|
|
if not _is_within(target, root):
|
|
return None
|
|
if _mutates_worktree(subcommand, sub_args):
|
|
return f"git {subcommand}"
|
|
if subcommand in _KNOWN_GIT_BUILTINS or depth >= _MAX_RECURSION:
|
|
return None
|
|
|
|
alias = inline_aliases.get(subcommand)
|
|
if alias is None:
|
|
alias = _read_git_alias(executable, target, subcommand)
|
|
if not alias:
|
|
return None
|
|
if alias.startswith("!"):
|
|
return _find_mutation(alias[1:], target, root, depth + 1)
|
|
try:
|
|
alias_args = shlex.split(alias, posix=True)
|
|
except ValueError:
|
|
return None
|
|
return _inspect_git(
|
|
executable,
|
|
[*alias_args, *sub_args],
|
|
target,
|
|
{},
|
|
root,
|
|
depth + 1,
|
|
)
|
|
|
|
|
|
def _inspect_github_cli(
|
|
executable: str,
|
|
args: list[str],
|
|
current_dir: Path,
|
|
env: dict[str, str],
|
|
root: Path,
|
|
depth: int,
|
|
) -> str | None:
|
|
if not _is_within(current_dir, root):
|
|
return None
|
|
name = _executable_name(executable)
|
|
index = _consume_options(args, 0, frozenset({"-R", "--repo", "--hostname"}))
|
|
if args[index : index + 2] == ["pr", "checkout"]:
|
|
return f"{name} pr checkout"
|
|
return None
|
|
|
|
|
|
def _inspect_shell(
|
|
executable: str,
|
|
args: list[str],
|
|
current_dir: Path,
|
|
env: dict[str, str],
|
|
root: Path,
|
|
depth: int,
|
|
) -> str | None:
|
|
script = _shell_script_arg(args)
|
|
if script:
|
|
return _find_mutation(script, current_dir, root, depth + 1)
|
|
return None
|
|
|
|
|
|
# executable name -> inspector(executable, args, current_dir, env, root, depth)
|
|
_INSPECTORS: dict[str, Callable[..., str | None]] = {
|
|
"git": _inspect_git,
|
|
"gh": _inspect_github_cli,
|
|
"hub": _inspect_github_cli,
|
|
**{shell: _inspect_shell for shell in _SHELL_EXECUTABLES},
|
|
}
|
|
|
|
|
|
def _find_mutation(command: str, cwd: Path, root: Path, depth: int = 0) -> str | None:
|
|
"""Name of the first command in ``command`` that would rewrite ``root``, else None."""
|
|
if depth > _MAX_RECURSION:
|
|
return None
|
|
|
|
masked_command, heredoc_scripts = _mask_heredocs(command)
|
|
for script in heredoc_scripts:
|
|
operation = _find_mutation(script, cwd, root, depth + 1)
|
|
if operation:
|
|
return operation
|
|
|
|
starts = sorted(set(_iter_shell_command_starts(masked_command)))
|
|
scopes = _scope_keys(masked_command, starts)
|
|
# cwd is tracked per subshell scope: `cd` only takes effect for the NEXT
|
|
# command when joined by `&&`, `;` or a newline (not `||` / `|`).
|
|
cwd_by_scope: dict[tuple[int, ...], Path] = {(): cwd}
|
|
pending_cd: dict[tuple[int, ...], Path] = {}
|
|
|
|
for start in starts:
|
|
scope = scopes[start]
|
|
if scope not in cwd_by_scope:
|
|
cwd_by_scope[scope] = cwd_by_scope.get(scope[:-1], cwd)
|
|
|
|
operator = _operator_before(masked_command, start)
|
|
pending = pending_cd.pop(scope, None)
|
|
if pending is not None and operator in {"&&", ";", "\n"}:
|
|
cwd_by_scope[scope] = pending
|
|
|
|
words = _shell_words_at(masked_command, start)
|
|
env, executable, args = _command_parts(words)
|
|
if executable is None:
|
|
continue
|
|
|
|
current_dir = cwd_by_scope[scope]
|
|
cd_target = _cd_target(executable, args, current_dir)
|
|
if cd_target is not None:
|
|
pending_cd[scope] = cd_target
|
|
continue
|
|
|
|
inspect = _INSPECTORS.get(_executable_name(executable))
|
|
if inspect is not None:
|
|
operation = inspect(executable, args, current_dir, env, root, depth)
|
|
if operation:
|
|
return operation
|
|
|
|
return None
|
|
|
|
|
|
def guard_active() -> bool:
|
|
"""Whether the self-repo git guard applies on this platform.
|
|
|
|
Windows-only: NTFS locks loaded .py/.pyd files, so an in-place overwrite of
|
|
the live checkout can corrupt the running process. On POSIX, open handles
|
|
keep the old inode alive, so already-imported modules keep running; the
|
|
mixed-module hazard is limited to later lazy imports — not worth blocking
|
|
every git workflow for.
|
|
"""
|
|
return os.name == "nt"
|
|
|
|
|
|
def detect_self_repo_git_mutation(
|
|
command: str,
|
|
cwd: str | None,
|
|
source_root: Path | None = None,
|
|
) -> tuple[bool, str | None]:
|
|
"""Return whether a command would rewrite the live source checkout."""
|
|
root = source_root if source_root is not None else get_running_source_root()
|
|
if root is None or not command:
|
|
return False, None
|
|
|
|
root = _resolve(str(root), Path("/"))
|
|
base = _resolve(cwd, Path("/")) if cwd else Path("/")
|
|
operation = _find_mutation(command, base, root)
|
|
if operation is None:
|
|
return False, None
|
|
return True, _block_message(operation, root)
|
|
|
|
|
|
def _block_message(operation: str, root: Path) -> str:
|
|
# Suggest a disk-backed scratch dir: /tmp is usually tmpfs (see message).
|
|
hermes_home = os.environ.get("HERMES_HOME", "").strip()
|
|
scratch = (Path(hermes_home).expanduser() if hermes_home else Path.home() / ".hermes") / "scratch"
|
|
return (
|
|
f"Blocked: `{operation}` would rewrite Hermes's live source checkout "
|
|
f"({root}) and can mix module versions in this running process. "
|
|
f"Use a separate worktree or a shared clone on real disk, e.g. "
|
|
f"`git clone --shared {root} {scratch}/<task>` — avoid /tmp for "
|
|
"clones that install node/python deps: /tmp is usually RAM-backed "
|
|
"tmpfs and a few dependency installs can fill it and ENOSPC other "
|
|
"work. Delete the clone when the branch is pushed. To change this "
|
|
"checkout, stop Hermes, run the command externally, then restart "
|
|
"Hermes."
|
|
)
|