mirror of
https://github.com/google-gemini/gemini-cli.git
synced 2026-03-11 22:51:00 -07:00
516 lines
17 KiB
TypeScript
516 lines
17 KiB
TypeScript
/**
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* @license
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* Copyright 2025 Google LLC
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* SPDX-License-Identifier: Apache-2.0
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*/
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import fs from 'node:fs';
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import path from 'node:path';
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import os, { EOL } from 'node:os';
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import crypto from 'node:crypto';
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import type { Config } from '../config/config.js';
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import { debugLogger, type AnyToolInvocation } from '../index.js';
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import { ToolErrorType } from './tool-error.js';
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import type {
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ToolInvocation,
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ToolResult,
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ToolCallConfirmationDetails,
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ToolExecuteConfirmationDetails,
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} from './tools.js';
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import {
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BaseDeclarativeTool,
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BaseToolInvocation,
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ToolConfirmationOutcome,
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Kind,
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} from './tools.js';
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import { ApprovalMode } from '../policy/types.js';
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import { getErrorMessage } from '../utils/errors.js';
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import { summarizeToolOutput } from '../utils/summarizer.js';
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import type {
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ShellExecutionConfig,
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ShellOutputEvent,
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} from '../services/shellExecutionService.js';
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import { ShellExecutionService } from '../services/shellExecutionService.js';
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import { formatMemoryUsage } from '../utils/formatters.js';
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import type { AnsiOutput } from '../utils/terminalSerializer.js';
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import {
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getCommandRoots,
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initializeShellParsers,
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isCommandAllowed,
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isShellInvocationAllowlisted,
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stripShellWrapper,
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} from '../utils/shell-utils.js';
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import { SHELL_TOOL_NAME } from './tool-names.js';
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import type { MessageBus } from '../confirmation-bus/message-bus.js';
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export const OUTPUT_UPDATE_INTERVAL_MS = 1000;
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export interface ShellToolParams {
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command: string;
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description?: string;
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dir_path?: string;
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}
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export class ShellToolInvocation extends BaseToolInvocation<
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ShellToolParams,
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ToolResult
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> {
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constructor(
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private readonly config: Config,
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params: ShellToolParams,
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private readonly allowlist: Set<string>,
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messageBus?: MessageBus,
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_toolName?: string,
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_toolDisplayName?: string,
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) {
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super(params, messageBus, _toolName, _toolDisplayName);
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}
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getDescription(): string {
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let description = `${this.params.command}`;
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// append optional [in directory]
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// note description is needed even if validation fails due to absolute path
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if (this.params.dir_path) {
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description += ` [in ${this.params.dir_path}]`;
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} else {
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description += ` [current working directory ${process.cwd()}]`;
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}
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// append optional (description), replacing any line breaks with spaces
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if (this.params.description) {
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description += ` (${this.params.description.replace(/\n/g, ' ')})`;
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}
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return description;
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}
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protected override async getConfirmationDetails(
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_abortSignal: AbortSignal,
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): Promise<ToolCallConfirmationDetails | false> {
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const command = stripShellWrapper(this.params.command);
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const rootCommands = [...new Set(getCommandRoots(command))];
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// In non-interactive mode, we need to prevent the tool from hanging while
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// waiting for user input. If a tool is not fully allowed (e.g. via
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// --allowed-tools="ShellTool(wc)"), we should throw an error instead of
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// prompting for confirmation. This check is skipped in YOLO mode.
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if (
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!this.config.isInteractive() &&
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this.config.getApprovalMode() !== ApprovalMode.YOLO
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) {
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if (this.isInvocationAllowlisted(command)) {
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// If it's an allowed shell command, we don't need to confirm execution.
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return false;
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}
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throw new Error(
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`Command "${command}" is not in the list of allowed tools for non-interactive mode.`,
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);
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}
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const commandsToConfirm = rootCommands.filter(
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(command) => !this.allowlist.has(command),
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);
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if (commandsToConfirm.length === 0) {
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return false; // already approved and allowlisted
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}
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const confirmationDetails: ToolExecuteConfirmationDetails = {
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type: 'exec',
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title: 'Confirm Shell Command',
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command: this.params.command,
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rootCommand: commandsToConfirm.join(', '),
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onConfirm: async (outcome: ToolConfirmationOutcome) => {
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if (outcome === ToolConfirmationOutcome.ProceedAlways) {
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commandsToConfirm.forEach((command) => this.allowlist.add(command));
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}
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},
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};
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return confirmationDetails;
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}
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async execute(
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signal: AbortSignal,
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updateOutput?: (output: string | AnsiOutput) => void,
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shellExecutionConfig?: ShellExecutionConfig,
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setPidCallback?: (pid: number) => void,
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): Promise<ToolResult> {
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const strippedCommand = stripShellWrapper(this.params.command);
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if (signal.aborted) {
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return {
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llmContent: 'Command was cancelled by user before it could start.',
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returnDisplay: 'Command cancelled by user.',
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};
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}
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const isWindows = os.platform() === 'win32';
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const tempFileName = `shell_pgrep_${crypto
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.randomBytes(6)
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.toString('hex')}.tmp`;
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const tempFilePath = path.join(os.tmpdir(), tempFileName);
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const timeoutMs = this.config.getShellToolInactivityTimeout();
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const timeoutController = new AbortController();
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let timeoutTimer: NodeJS.Timeout | undefined;
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// Handle signal combination manually to avoid TS issues or runtime missing features
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const combinedController = new AbortController();
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const onAbort = () => combinedController.abort();
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try {
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// pgrep is not available on Windows, so we can't get background PIDs
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const commandToExecute = isWindows
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? strippedCommand
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: (() => {
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// wrap command to append subprocess pids (via pgrep) to temporary file
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let command = strippedCommand.trim();
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if (!command.endsWith('&')) command += ';';
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return `{ ${command} }; __code=$?; pgrep -g 0 >${tempFilePath} 2>&1; exit $__code;`;
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})();
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const cwd = this.params.dir_path
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? path.resolve(this.config.getTargetDir(), this.params.dir_path)
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: this.config.getTargetDir();
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let cumulativeOutput: string | AnsiOutput = '';
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let lastUpdateTime = Date.now();
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let isBinaryStream = false;
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const resetTimeout = () => {
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if (timeoutMs <= 0) {
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return;
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}
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if (timeoutTimer) clearTimeout(timeoutTimer);
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timeoutTimer = setTimeout(() => {
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timeoutController.abort();
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}, timeoutMs);
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};
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signal.addEventListener('abort', onAbort, { once: true });
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timeoutController.signal.addEventListener('abort', onAbort, {
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once: true,
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});
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// Start timeout
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resetTimeout();
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const { result: resultPromise, pid } =
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await ShellExecutionService.execute(
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commandToExecute,
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cwd,
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(event: ShellOutputEvent) => {
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resetTimeout(); // Reset timeout on any event
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if (!updateOutput) {
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return;
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}
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let shouldUpdate = false;
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switch (event.type) {
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case 'data':
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if (isBinaryStream) break;
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cumulativeOutput = event.chunk;
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shouldUpdate = true;
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break;
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case 'binary_detected':
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isBinaryStream = true;
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cumulativeOutput =
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'[Binary output detected. Halting stream...]';
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shouldUpdate = true;
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break;
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case 'binary_progress':
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isBinaryStream = true;
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cumulativeOutput = `[Receiving binary output... ${formatMemoryUsage(
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event.bytesReceived,
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)} received]`;
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if (Date.now() - lastUpdateTime > OUTPUT_UPDATE_INTERVAL_MS) {
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shouldUpdate = true;
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}
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break;
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default: {
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throw new Error('An unhandled ShellOutputEvent was found.');
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}
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}
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if (shouldUpdate) {
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updateOutput(cumulativeOutput);
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lastUpdateTime = Date.now();
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}
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},
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combinedController.signal,
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this.config.getEnableInteractiveShell(),
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{ ...shellExecutionConfig, pager: 'cat' },
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);
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if (pid && setPidCallback) {
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setPidCallback(pid);
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}
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const result = await resultPromise;
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const backgroundPIDs: number[] = [];
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if (os.platform() !== 'win32') {
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if (fs.existsSync(tempFilePath)) {
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const pgrepLines = fs
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.readFileSync(tempFilePath, 'utf8')
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.split(EOL)
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.filter(Boolean);
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for (const line of pgrepLines) {
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if (!/^\d+$/.test(line)) {
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debugLogger.error(`pgrep: ${line}`);
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}
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const pid = Number(line);
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if (pid !== result.pid) {
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backgroundPIDs.push(pid);
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}
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}
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} else {
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if (!signal.aborted) {
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debugLogger.error('missing pgrep output');
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}
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}
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}
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let llmContent = '';
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let timeoutMessage = '';
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if (result.aborted) {
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if (timeoutController.signal.aborted) {
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timeoutMessage = `Command was automatically cancelled because it exceeded the timeout of ${(
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timeoutMs / 60000
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).toFixed(1)} minutes without output.`;
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llmContent = timeoutMessage;
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} else {
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llmContent =
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'Command was cancelled by user before it could complete.';
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}
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if (result.output.trim()) {
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llmContent += ` Below is the output before it was cancelled:\n${result.output}`;
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} else {
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llmContent += ' There was no output before it was cancelled.';
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}
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} else {
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// Create a formatted error string for display, replacing the wrapper command
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// with the user-facing command.
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const finalError = result.error
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? result.error.message.replace(commandToExecute, this.params.command)
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: '(none)';
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llmContent = [
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`Command: ${this.params.command}`,
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`Directory: ${this.params.dir_path || '(root)'}`,
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`Output: ${result.output || '(empty)'}`,
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`Error: ${finalError}`, // Use the cleaned error string.
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`Exit Code: ${result.exitCode ?? '(none)'}`,
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`Signal: ${result.signal ?? '(none)'}`,
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`Background PIDs: ${
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backgroundPIDs.length ? backgroundPIDs.join(', ') : '(none)'
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}`,
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`Process Group PGID: ${result.pid ?? '(none)'}`,
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].join('\n');
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}
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let returnDisplayMessage = '';
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if (this.config.getDebugMode()) {
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returnDisplayMessage = llmContent;
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} else {
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if (result.output.trim()) {
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returnDisplayMessage = result.output;
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} else {
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if (result.aborted) {
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if (timeoutMessage) {
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returnDisplayMessage = timeoutMessage;
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} else {
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returnDisplayMessage = 'Command cancelled by user.';
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}
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} else if (result.signal) {
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returnDisplayMessage = `Command terminated by signal: ${result.signal}`;
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} else if (result.error) {
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returnDisplayMessage = `Command failed: ${getErrorMessage(
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result.error,
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)}`;
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} else if (result.exitCode !== null && result.exitCode !== 0) {
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returnDisplayMessage = `Command exited with code: ${result.exitCode}`;
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}
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// If output is empty and command succeeded (code 0, no error/signal/abort),
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// returnDisplayMessage will remain empty, which is fine.
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}
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}
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const summarizeConfig = this.config.getSummarizeToolOutputConfig();
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const executionError = result.error
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? {
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error: {
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message: result.error.message,
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type: ToolErrorType.SHELL_EXECUTE_ERROR,
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},
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}
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: {};
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if (summarizeConfig && summarizeConfig[SHELL_TOOL_NAME]) {
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const summary = await summarizeToolOutput(
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this.config,
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{ model: 'summarizer-shell' },
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llmContent,
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this.config.getGeminiClient(),
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signal,
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);
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return {
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llmContent: summary,
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returnDisplay: returnDisplayMessage,
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...executionError,
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};
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}
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return {
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llmContent,
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returnDisplay: returnDisplayMessage,
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...executionError,
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};
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} finally {
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if (timeoutTimer) clearTimeout(timeoutTimer);
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signal.removeEventListener('abort', onAbort);
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timeoutController.signal.removeEventListener('abort', onAbort);
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if (fs.existsSync(tempFilePath)) {
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fs.unlinkSync(tempFilePath);
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}
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}
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}
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private isInvocationAllowlisted(command: string): boolean {
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const allowedTools = this.config.getAllowedTools() || [];
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if (allowedTools.length === 0) {
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return false;
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}
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const invocation = { params: { command } } as unknown as AnyToolInvocation;
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return isShellInvocationAllowlisted(invocation, allowedTools);
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}
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}
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function getShellToolDescription(): string {
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const returnedInfo = `
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The following information is returned:
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Command: Executed command.
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Directory: Directory where command was executed, or \`(root)\`.
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Stdout: Output on stdout stream. Can be \`(empty)\` or partial on error and for any unwaited background processes.
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Stderr: Output on stderr stream. Can be \`(empty)\` or partial on error and for any unwaited background processes.
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Error: Error or \`(none)\` if no error was reported for the subprocess.
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Exit Code: Exit code or \`(none)\` if terminated by signal.
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Signal: Signal number or \`(none)\` if no signal was received.
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Background PIDs: List of background processes started or \`(none)\`.
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Process Group PGID: Process group started or \`(none)\``;
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if (os.platform() === 'win32') {
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return `This tool executes a given shell command as \`powershell.exe -NoProfile -Command <command>\`. Command can start background processes using PowerShell constructs such as \`Start-Process -NoNewWindow\` or \`Start-Job\`.${returnedInfo}`;
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} else {
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return `This tool executes a given shell command as \`bash -c <command>\`. Command can start background processes using \`&\`. Command is executed as a subprocess that leads its own process group. Command process group can be terminated as \`kill -- -PGID\` or signaled as \`kill -s SIGNAL -- -PGID\`.${returnedInfo}`;
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}
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}
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function getCommandDescription(): string {
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if (os.platform() === 'win32') {
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return 'Exact command to execute as `powershell.exe -NoProfile -Command <command>`';
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} else {
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return 'Exact bash command to execute as `bash -c <command>`';
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}
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}
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export class ShellTool extends BaseDeclarativeTool<
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ShellToolParams,
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ToolResult
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> {
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static readonly Name = SHELL_TOOL_NAME;
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private allowlist: Set<string> = new Set();
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constructor(
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private readonly config: Config,
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messageBus?: MessageBus,
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) {
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void initializeShellParsers().catch(() => {
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// Errors are surfaced when parsing commands.
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});
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super(
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ShellTool.Name,
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'Shell',
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getShellToolDescription(),
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Kind.Execute,
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{
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type: 'object',
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properties: {
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command: {
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type: 'string',
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description: getCommandDescription(),
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},
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description: {
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type: 'string',
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description:
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'Brief description of the command for the user. Be specific and concise. Ideally a single sentence. Can be up to 3 sentences for clarity. No line breaks.',
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},
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dir_path: {
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type: 'string',
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description:
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'(OPTIONAL) The path of the directory to run the command in. If not provided, the project root directory is used. Must be a directory within the workspace and must already exist.',
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},
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},
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required: ['command'],
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},
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false, // output is not markdown
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true, // output can be updated
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messageBus,
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);
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}
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protected override validateToolParamValues(
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params: ShellToolParams,
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): string | null {
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if (!params.command.trim()) {
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return 'Command cannot be empty.';
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}
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const commandCheck = isCommandAllowed(params.command, this.config);
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if (!commandCheck.allowed) {
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if (!commandCheck.reason) {
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debugLogger.error(
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'Unexpected: isCommandAllowed returned false without a reason',
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);
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return `Command is not allowed: ${params.command}`;
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}
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return commandCheck.reason;
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}
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if (getCommandRoots(params.command).length === 0) {
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return 'Could not identify command root to obtain permission from user.';
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}
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if (params.dir_path) {
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const resolvedPath = path.resolve(
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this.config.getTargetDir(),
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params.dir_path,
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);
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const workspaceContext = this.config.getWorkspaceContext();
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if (!workspaceContext.isPathWithinWorkspace(resolvedPath)) {
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return `Directory '${resolvedPath}' is not within any of the registered workspace directories.`;
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}
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}
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return null;
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}
|
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|
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protected createInvocation(
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params: ShellToolParams,
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messageBus?: MessageBus,
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_toolName?: string,
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_toolDisplayName?: string,
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): ToolInvocation<ShellToolParams, ToolResult> {
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return new ShellToolInvocation(
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this.config,
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params,
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this.allowlist,
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messageBus,
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_toolName,
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_toolDisplayName,
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);
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}
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}
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