681 lines
20 KiB
TypeScript
681 lines
20 KiB
TypeScript
import type { AgentToolResult } from "@mariozechner/pi-agent-core";
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import type { ChildProcessWithoutNullStreams } from "node:child_process";
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import { Type } from "@sinclair/typebox";
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import path from "node:path";
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import type { ExecAsk, ExecHost, ExecSecurity } from "../infra/exec-approvals.js";
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import type { ProcessSession, SessionStdin } from "./bash-process-registry.js";
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import type { ExecToolDetails } from "./bash-tools.exec.js";
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import type { BashSandboxConfig } from "./bash-tools.shared.js";
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import { requestHeartbeatNow } from "../infra/heartbeat-wake.js";
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import { mergePathPrepend } from "../infra/path-prepend.js";
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import { enqueueSystemEvent } from "../infra/system-events.js";
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export { applyPathPrepend, normalizePathPrepend } from "../infra/path-prepend.js";
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import { logWarn } from "../logger.js";
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import { formatSpawnError, spawnWithFallback } from "../process/spawn-utils.js";
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import {
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addSession,
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appendOutput,
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createSessionSlug,
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markExited,
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tail,
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} from "./bash-process-registry.js";
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import {
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buildDockerExecArgs,
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chunkString,
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clampWithDefault,
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killSession,
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readEnvInt,
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} from "./bash-tools.shared.js";
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import { buildCursorPositionResponse, stripDsrRequests } from "./pty-dsr.js";
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import { getShellConfig, sanitizeBinaryOutput } from "./shell-utils.js";
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// Security: Blocklist of environment variables that could alter execution flow
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// or inject code when running on non-sandboxed hosts (Gateway/Node).
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const DANGEROUS_HOST_ENV_VARS = new Set([
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"LD_PRELOAD",
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"LD_LIBRARY_PATH",
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"LD_AUDIT",
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"DYLD_INSERT_LIBRARIES",
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"DYLD_LIBRARY_PATH",
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"NODE_OPTIONS",
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"NODE_PATH",
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"PYTHONPATH",
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"PYTHONHOME",
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"RUBYLIB",
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"PERL5LIB",
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"BASH_ENV",
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"ENV",
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"GCONV_PATH",
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"IFS",
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"SSLKEYLOGFILE",
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]);
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const DANGEROUS_HOST_ENV_PREFIXES = ["DYLD_", "LD_"];
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// Centralized sanitization helper.
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// Throws an error if dangerous variables or PATH modifications are detected on the host.
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export function validateHostEnv(env: Record<string, string>): void {
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for (const key of Object.keys(env)) {
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const upperKey = key.toUpperCase();
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// 1. Block known dangerous variables (Fail Closed)
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if (DANGEROUS_HOST_ENV_PREFIXES.some((prefix) => upperKey.startsWith(prefix))) {
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throw new Error(
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`Security Violation: Environment variable '${key}' is forbidden during host execution.`,
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);
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}
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if (DANGEROUS_HOST_ENV_VARS.has(upperKey)) {
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throw new Error(
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`Security Violation: Environment variable '${key}' is forbidden during host execution.`,
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);
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}
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// 2. Strictly block PATH modification on host
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// Allowing custom PATH on the gateway/node can lead to binary hijacking.
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if (upperKey === "PATH") {
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throw new Error(
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"Security Violation: Custom 'PATH' variable is forbidden during host execution.",
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);
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}
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}
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}
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export const DEFAULT_MAX_OUTPUT = clampWithDefault(
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readEnvInt("PI_BASH_MAX_OUTPUT_CHARS"),
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200_000,
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1_000,
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200_000,
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);
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export const DEFAULT_PENDING_MAX_OUTPUT = clampWithDefault(
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readEnvInt("OPENCLAW_BASH_PENDING_MAX_OUTPUT_CHARS"),
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30_000,
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1_000,
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200_000,
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);
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export const DEFAULT_PATH =
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process.env.PATH ?? "/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin";
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export const DEFAULT_NOTIFY_TAIL_CHARS = 400;
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const DEFAULT_NOTIFY_SNIPPET_CHARS = 180;
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export const DEFAULT_APPROVAL_TIMEOUT_MS = 120_000;
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export const DEFAULT_APPROVAL_REQUEST_TIMEOUT_MS = 130_000;
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const DEFAULT_APPROVAL_RUNNING_NOTICE_MS = 10_000;
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const APPROVAL_SLUG_LENGTH = 8;
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export const execSchema = Type.Object({
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command: Type.String({ description: "Shell command to execute" }),
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workdir: Type.Optional(Type.String({ description: "Working directory (defaults to cwd)" })),
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env: Type.Optional(Type.Record(Type.String(), Type.String())),
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yieldMs: Type.Optional(
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Type.Number({
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description: "Milliseconds to wait before backgrounding (default 10000)",
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}),
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),
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background: Type.Optional(Type.Boolean({ description: "Run in background immediately" })),
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timeout: Type.Optional(
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Type.Number({
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description: "Timeout in seconds (optional, kills process on expiry)",
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}),
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),
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pty: Type.Optional(
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Type.Boolean({
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description:
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"Run in a pseudo-terminal (PTY) when available (TTY-required CLIs, coding agents)",
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}),
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),
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elevated: Type.Optional(
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Type.Boolean({
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description: "Run on the host with elevated permissions (if allowed)",
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}),
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),
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host: Type.Optional(
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Type.String({
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description: "Exec host (sandbox|gateway|node).",
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}),
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),
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security: Type.Optional(
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Type.String({
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description: "Exec security mode (deny|allowlist|full).",
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}),
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),
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ask: Type.Optional(
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Type.String({
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description: "Exec ask mode (off|on-miss|always).",
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}),
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),
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node: Type.Optional(
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Type.String({
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description: "Node id/name for host=node.",
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}),
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),
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});
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type PtyExitEvent = { exitCode: number; signal?: number };
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type PtyListener<T> = (event: T) => void;
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type PtyHandle = {
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pid: number;
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write: (data: string | Buffer) => void;
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onData: (listener: PtyListener<string>) => void;
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onExit: (listener: PtyListener<PtyExitEvent>) => void;
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};
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type PtySpawn = (
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file: string,
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args: string[] | string,
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options: {
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name?: string;
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cols?: number;
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rows?: number;
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cwd?: string;
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env?: Record<string, string>;
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},
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) => PtyHandle;
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export type ExecProcessOutcome = {
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status: "completed" | "failed";
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exitCode: number | null;
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exitSignal: NodeJS.Signals | number | null;
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durationMs: number;
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aggregated: string;
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timedOut: boolean;
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reason?: string;
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};
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export type ExecProcessHandle = {
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session: ProcessSession;
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startedAt: number;
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pid?: number;
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promise: Promise<ExecProcessOutcome>;
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kill: () => void;
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};
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export function normalizeExecHost(value?: string | null): ExecHost | null {
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const normalized = value?.trim().toLowerCase();
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if (normalized === "sandbox" || normalized === "gateway" || normalized === "node") {
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return normalized;
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}
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return null;
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}
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export function normalizeExecSecurity(value?: string | null): ExecSecurity | null {
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const normalized = value?.trim().toLowerCase();
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if (normalized === "deny" || normalized === "allowlist" || normalized === "full") {
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return normalized;
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}
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return null;
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}
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export function normalizeExecAsk(value?: string | null): ExecAsk | null {
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const normalized = value?.trim().toLowerCase();
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if (normalized === "off" || normalized === "on-miss" || normalized === "always") {
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return normalized as ExecAsk;
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}
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return null;
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}
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export function renderExecHostLabel(host: ExecHost) {
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return host === "sandbox" ? "sandbox" : host === "gateway" ? "gateway" : "node";
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}
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export function normalizeNotifyOutput(value: string) {
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return value.replace(/\s+/g, " ").trim();
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}
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function compactNotifyOutput(value: string, maxChars = DEFAULT_NOTIFY_SNIPPET_CHARS) {
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const normalized = normalizeNotifyOutput(value);
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if (!normalized) {
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return "";
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}
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if (normalized.length <= maxChars) {
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return normalized;
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}
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const safe = Math.max(1, maxChars - 1);
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return `${normalized.slice(0, safe)}…`;
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}
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export function applyShellPath(env: Record<string, string>, shellPath?: string | null) {
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if (!shellPath) {
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return;
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}
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const entries = shellPath
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.split(path.delimiter)
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.map((part) => part.trim())
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.filter(Boolean);
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if (entries.length === 0) {
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return;
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}
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const merged = mergePathPrepend(env.PATH, entries);
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if (merged) {
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env.PATH = merged;
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}
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}
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function maybeNotifyOnExit(session: ProcessSession, status: "completed" | "failed") {
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if (!session.backgrounded || !session.notifyOnExit || session.exitNotified) {
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return;
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}
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const sessionKey = session.sessionKey?.trim();
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if (!sessionKey) {
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return;
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}
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session.exitNotified = true;
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const exitLabel = session.exitSignal
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? `signal ${session.exitSignal}`
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: `code ${session.exitCode ?? 0}`;
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const output = compactNotifyOutput(
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tail(session.tail || session.aggregated || "", DEFAULT_NOTIFY_TAIL_CHARS),
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);
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if (status === "completed" && !output && session.notifyOnExitEmptySuccess !== true) {
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return;
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}
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const summary = output
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? `Exec ${status} (${session.id.slice(0, 8)}, ${exitLabel}) :: ${output}`
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: `Exec ${status} (${session.id.slice(0, 8)}, ${exitLabel})`;
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enqueueSystemEvent(summary, { sessionKey });
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requestHeartbeatNow({ reason: `exec:${session.id}:exit` });
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}
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export function createApprovalSlug(id: string) {
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return id.slice(0, APPROVAL_SLUG_LENGTH);
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}
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export function resolveApprovalRunningNoticeMs(value?: number) {
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if (typeof value !== "number" || !Number.isFinite(value)) {
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return DEFAULT_APPROVAL_RUNNING_NOTICE_MS;
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}
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if (value <= 0) {
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return 0;
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}
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return Math.floor(value);
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}
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export function emitExecSystemEvent(
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text: string,
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opts: { sessionKey?: string; contextKey?: string },
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) {
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const sessionKey = opts.sessionKey?.trim();
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if (!sessionKey) {
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return;
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}
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enqueueSystemEvent(text, { sessionKey, contextKey: opts.contextKey });
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requestHeartbeatNow({ reason: "exec-event" });
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}
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export async function runExecProcess(opts: {
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command: string;
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// Execute this instead of `command` (which is kept for display/session/logging).
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// Used to sanitize safeBins execution while preserving the original user input.
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execCommand?: string;
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workdir: string;
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env: Record<string, string>;
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sandbox?: BashSandboxConfig;
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containerWorkdir?: string | null;
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usePty: boolean;
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warnings: string[];
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maxOutput: number;
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pendingMaxOutput: number;
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notifyOnExit: boolean;
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notifyOnExitEmptySuccess?: boolean;
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scopeKey?: string;
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sessionKey?: string;
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timeoutSec: number;
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onUpdate?: (partialResult: AgentToolResult<ExecToolDetails>) => void;
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}): Promise<ExecProcessHandle> {
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const startedAt = Date.now();
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const sessionId = createSessionSlug();
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let child: ChildProcessWithoutNullStreams | null = null;
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let pty: PtyHandle | null = null;
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let stdin: SessionStdin | undefined;
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const execCommand = opts.execCommand ?? opts.command;
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const spawnFallbacks = [
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{
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label: "no-detach",
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options: { detached: false },
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},
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];
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const handleSpawnFallback = (err: unknown, fallback: { label: string }) => {
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const errText = formatSpawnError(err);
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const warning = `Warning: spawn failed (${errText}); retrying with ${fallback.label}.`;
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logWarn(`exec: spawn failed (${errText}); retrying with ${fallback.label}.`);
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opts.warnings.push(warning);
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};
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const spawnShellChild = async (
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shell: string,
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shellArgs: string[],
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): Promise<ChildProcessWithoutNullStreams> => {
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const { child: spawned } = await spawnWithFallback({
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argv: [shell, ...shellArgs, execCommand],
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options: {
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cwd: opts.workdir,
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env: opts.env,
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detached: process.platform !== "win32",
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stdio: ["pipe", "pipe", "pipe"],
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windowsHide: true,
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},
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fallbacks: spawnFallbacks,
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onFallback: handleSpawnFallback,
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});
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return spawned as ChildProcessWithoutNullStreams;
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};
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// `exec` does not currently accept tool-provided stdin content. For non-PTY runs,
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// keeping stdin open can cause commands like `wc -l` (or safeBins-hardened segments)
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// to block forever waiting for input, leading to accidental backgrounding.
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// For interactive flows, callers should use `pty: true` (stdin kept open).
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const maybeCloseNonPtyStdin = () => {
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if (opts.usePty) {
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return;
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}
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try {
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// Signal EOF immediately so stdin-only commands can terminate.
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child?.stdin?.end();
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} catch {
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// ignore stdin close errors
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}
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};
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if (opts.sandbox) {
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const { child: spawned } = await spawnWithFallback({
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argv: [
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"docker",
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...buildDockerExecArgs({
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containerName: opts.sandbox.containerName,
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command: execCommand,
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workdir: opts.containerWorkdir ?? opts.sandbox.containerWorkdir,
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env: opts.env,
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tty: opts.usePty,
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}),
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],
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options: {
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cwd: opts.workdir,
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env: process.env,
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detached: process.platform !== "win32",
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stdio: ["pipe", "pipe", "pipe"],
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windowsHide: true,
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},
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fallbacks: spawnFallbacks,
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onFallback: handleSpawnFallback,
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});
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child = spawned as ChildProcessWithoutNullStreams;
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stdin = child.stdin;
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maybeCloseNonPtyStdin();
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} else if (opts.usePty) {
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const { shell, args: shellArgs } = getShellConfig();
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try {
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const ptyModule = (await import("@lydell/node-pty")) as unknown as {
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spawn?: PtySpawn;
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default?: { spawn?: PtySpawn };
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};
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const spawnPty = ptyModule.spawn ?? ptyModule.default?.spawn;
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if (!spawnPty) {
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throw new Error("PTY support is unavailable (node-pty spawn not found).");
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}
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pty = spawnPty(shell, [...shellArgs, execCommand], {
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cwd: opts.workdir,
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env: opts.env,
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name: process.env.TERM ?? "xterm-256color",
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cols: 120,
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rows: 30,
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});
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stdin = {
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destroyed: false,
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write: (data, cb) => {
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try {
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pty?.write(data);
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cb?.(null);
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} catch (err) {
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cb?.(err as Error);
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}
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},
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end: () => {
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try {
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const eof = process.platform === "win32" ? "\x1a" : "\x04";
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pty?.write(eof);
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} catch {
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// ignore EOF errors
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}
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},
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};
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} catch (err) {
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const errText = String(err);
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const warning = `Warning: PTY spawn failed (${errText}); retrying without PTY for \`${opts.command}\`.`;
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logWarn(`exec: PTY spawn failed (${errText}); retrying without PTY for "${opts.command}".`);
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opts.warnings.push(warning);
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child = await spawnShellChild(shell, shellArgs);
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stdin = child.stdin;
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}
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} else {
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const { shell, args: shellArgs } = getShellConfig();
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child = await spawnShellChild(shell, shellArgs);
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stdin = child.stdin;
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maybeCloseNonPtyStdin();
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}
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const session = {
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id: sessionId,
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command: opts.command,
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scopeKey: opts.scopeKey,
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sessionKey: opts.sessionKey,
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notifyOnExit: opts.notifyOnExit,
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notifyOnExitEmptySuccess: opts.notifyOnExitEmptySuccess === true,
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exitNotified: false,
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child: child ?? undefined,
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stdin,
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pid: child?.pid ?? pty?.pid,
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startedAt,
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cwd: opts.workdir,
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maxOutputChars: opts.maxOutput,
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pendingMaxOutputChars: opts.pendingMaxOutput,
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totalOutputChars: 0,
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pendingStdout: [],
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pendingStderr: [],
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pendingStdoutChars: 0,
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pendingStderrChars: 0,
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aggregated: "",
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tail: "",
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exited: false,
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exitCode: undefined as number | null | undefined,
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exitSignal: undefined as NodeJS.Signals | number | null | undefined,
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truncated: false,
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backgrounded: false,
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} satisfies ProcessSession;
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addSession(session);
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let settled = false;
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let timeoutTimer: NodeJS.Timeout | null = null;
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let timeoutFinalizeTimer: NodeJS.Timeout | null = null;
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let timedOut = false;
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const timeoutFinalizeMs = 1000;
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let resolveFn: ((outcome: ExecProcessOutcome) => void) | null = null;
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const settle = (outcome: ExecProcessOutcome) => {
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if (settled) {
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return;
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}
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settled = true;
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resolveFn?.(outcome);
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};
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const finalizeTimeout = () => {
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if (session.exited) {
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return;
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}
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markExited(session, null, "SIGKILL", "failed");
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maybeNotifyOnExit(session, "failed");
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const aggregated = session.aggregated.trim();
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const reason = `Command timed out after ${opts.timeoutSec} seconds`;
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settle({
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status: "failed",
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exitCode: null,
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exitSignal: "SIGKILL",
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durationMs: Date.now() - startedAt,
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aggregated,
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timedOut: true,
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reason: aggregated ? `${aggregated}\n\n${reason}` : reason,
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});
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};
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const onTimeout = () => {
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timedOut = true;
|
|
killSession(session);
|
|
if (!timeoutFinalizeTimer) {
|
|
timeoutFinalizeTimer = setTimeout(() => {
|
|
finalizeTimeout();
|
|
}, timeoutFinalizeMs);
|
|
}
|
|
};
|
|
|
|
if (opts.timeoutSec > 0) {
|
|
timeoutTimer = setTimeout(() => {
|
|
onTimeout();
|
|
}, opts.timeoutSec * 1000);
|
|
}
|
|
|
|
const emitUpdate = () => {
|
|
if (!opts.onUpdate) {
|
|
return;
|
|
}
|
|
const tailText = session.tail || session.aggregated;
|
|
const warningText = opts.warnings.length ? `${opts.warnings.join("\n")}\n\n` : "";
|
|
opts.onUpdate({
|
|
content: [{ type: "text", text: warningText + (tailText || "") }],
|
|
details: {
|
|
status: "running",
|
|
sessionId,
|
|
pid: session.pid ?? undefined,
|
|
startedAt,
|
|
cwd: session.cwd,
|
|
tail: session.tail,
|
|
},
|
|
});
|
|
};
|
|
|
|
const handleStdout = (data: string) => {
|
|
const str = sanitizeBinaryOutput(data.toString());
|
|
for (const chunk of chunkString(str)) {
|
|
appendOutput(session, "stdout", chunk);
|
|
emitUpdate();
|
|
}
|
|
};
|
|
|
|
const handleStderr = (data: string) => {
|
|
const str = sanitizeBinaryOutput(data.toString());
|
|
for (const chunk of chunkString(str)) {
|
|
appendOutput(session, "stderr", chunk);
|
|
emitUpdate();
|
|
}
|
|
};
|
|
|
|
if (pty) {
|
|
const cursorResponse = buildCursorPositionResponse();
|
|
pty.onData((data) => {
|
|
const raw = data.toString();
|
|
const { cleaned, requests } = stripDsrRequests(raw);
|
|
if (requests > 0) {
|
|
for (let i = 0; i < requests; i += 1) {
|
|
pty.write(cursorResponse);
|
|
}
|
|
}
|
|
handleStdout(cleaned);
|
|
});
|
|
} else if (child) {
|
|
child.stdout.on("data", handleStdout);
|
|
child.stderr.on("data", handleStderr);
|
|
}
|
|
|
|
const promise = new Promise<ExecProcessOutcome>((resolve) => {
|
|
resolveFn = resolve;
|
|
const handleExit = (code: number | null, exitSignal: NodeJS.Signals | number | null) => {
|
|
if (timeoutTimer) {
|
|
clearTimeout(timeoutTimer);
|
|
}
|
|
if (timeoutFinalizeTimer) {
|
|
clearTimeout(timeoutFinalizeTimer);
|
|
}
|
|
const durationMs = Date.now() - startedAt;
|
|
const wasSignal = exitSignal != null;
|
|
const isSuccess = code === 0 && !wasSignal && !timedOut;
|
|
const status: "completed" | "failed" = isSuccess ? "completed" : "failed";
|
|
markExited(session, code, exitSignal, status);
|
|
maybeNotifyOnExit(session, status);
|
|
if (!session.child && session.stdin) {
|
|
session.stdin.destroyed = true;
|
|
}
|
|
|
|
if (settled) {
|
|
return;
|
|
}
|
|
const aggregated = session.aggregated.trim();
|
|
if (!isSuccess) {
|
|
const reason = timedOut
|
|
? `Command timed out after ${opts.timeoutSec} seconds`
|
|
: wasSignal && exitSignal
|
|
? `Command aborted by signal ${exitSignal}`
|
|
: code === null
|
|
? "Command aborted before exit code was captured"
|
|
: `Command exited with code ${code}`;
|
|
const message = aggregated ? `${aggregated}\n\n${reason}` : reason;
|
|
settle({
|
|
status: "failed",
|
|
exitCode: code ?? null,
|
|
exitSignal: exitSignal ?? null,
|
|
durationMs,
|
|
aggregated,
|
|
timedOut,
|
|
reason: message,
|
|
});
|
|
return;
|
|
}
|
|
settle({
|
|
status: "completed",
|
|
exitCode: code ?? 0,
|
|
exitSignal: exitSignal ?? null,
|
|
durationMs,
|
|
aggregated,
|
|
timedOut: false,
|
|
});
|
|
};
|
|
|
|
if (pty) {
|
|
pty.onExit((event) => {
|
|
const rawSignal = event.signal ?? null;
|
|
const normalizedSignal = rawSignal === 0 ? null : rawSignal;
|
|
handleExit(event.exitCode ?? null, normalizedSignal);
|
|
});
|
|
} else if (child) {
|
|
child.once("close", (code, exitSignal) => {
|
|
handleExit(code, exitSignal);
|
|
});
|
|
|
|
child.once("error", (err) => {
|
|
if (timeoutTimer) {
|
|
clearTimeout(timeoutTimer);
|
|
}
|
|
if (timeoutFinalizeTimer) {
|
|
clearTimeout(timeoutFinalizeTimer);
|
|
}
|
|
markExited(session, null, null, "failed");
|
|
maybeNotifyOnExit(session, "failed");
|
|
const aggregated = session.aggregated.trim();
|
|
const message = aggregated ? `${aggregated}\n\n${String(err)}` : String(err);
|
|
settle({
|
|
status: "failed",
|
|
exitCode: null,
|
|
exitSignal: null,
|
|
durationMs: Date.now() - startedAt,
|
|
aggregated,
|
|
timedOut,
|
|
reason: message,
|
|
});
|
|
});
|
|
}
|
|
});
|
|
|
|
return {
|
|
session,
|
|
startedAt,
|
|
pid: session.pid ?? undefined,
|
|
promise,
|
|
kill: () => killSession(session),
|
|
};
|
|
}
|