[A2A] Disable checkpointing if git is not installed (#16896)

packages/a2a-server/src/agent/task.ts

@@ -575,7 +575,10 @@ export class Task {
       EDIT_TOOL_NAMES.has(request.name),
     );
 
-    if (restorableToolCalls.length > 0) {
+    if (
+      restorableToolCalls.length > 0 &&
+      this.config.getCheckpointingEnabled()
+    ) {
       const gitService = await this.config.getGitService();
       if (gitService) {
         const { checkpointsToWrite, toolCallToCheckpointMap, errors } =

packages/a2a-server/src/config/config.test.ts

@@ -0,0 +1,110 @@
+/**
+ * @license
+ * Copyright 2025 Google LLC
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+import { describe, it, expect, vi, beforeEach, afterEach } from 'vitest';
+import { loadConfig } from './config.js';
+import type { ExtensionLoader } from '@google/gemini-cli-core';
+import type { Settings } from './settings.js';
+
+const {
+  mockLoadServerHierarchicalMemory,
+  mockConfigConstructor,
+  mockVerifyGitAvailability,
+} = vi.hoisted(() => ({
+  mockLoadServerHierarchicalMemory: vi.fn().mockResolvedValue({
+    memoryContent: '',
+    fileCount: 0,
+    filePaths: [],
+  }),
+  mockConfigConstructor: vi.fn(),
+  mockVerifyGitAvailability: vi.fn(),
+}));
+
+vi.mock('@google/gemini-cli-core', async () => ({
+  Config: class MockConfig {
+    constructor(params: unknown) {
+      mockConfigConstructor(params);
+    }
+    initialize = vi.fn();
+    refreshAuth = vi.fn();
+  },
+  loadServerHierarchicalMemory: mockLoadServerHierarchicalMemory,
+  startupProfiler: {
+    flush: vi.fn(),
+  },
+  FileDiscoveryService: vi.fn(),
+  ApprovalMode: { DEFAULT: 'default', YOLO: 'yolo' },
+  AuthType: {
+    LOGIN_WITH_GOOGLE: 'login_with_google',
+    USE_GEMINI: 'use_gemini',
+  },
+  GEMINI_DIR: '.gemini',
+  DEFAULT_GEMINI_EMBEDDING_MODEL: 'models/embedding-001',
+  DEFAULT_GEMINI_MODEL: 'models/gemini-1.5-flash',
+  PREVIEW_GEMINI_MODEL: 'models/gemini-1.5-pro-latest',
+  homedir: () => '/tmp',
+  GitService: {
+    verifyGitAvailability: mockVerifyGitAvailability,
+  },
+}));
+
+describe('loadConfig', () => {
+  const mockSettings = {
+    checkpointing: { enabled: true },
+  };
+  const mockExtensionLoader = {
+    start: vi.fn(),
+    getExtensions: vi.fn().mockReturnValue([]),
+  } as unknown as ExtensionLoader;
+
+  beforeEach(() => {
+    vi.resetAllMocks();
+    process.env['GEMINI_API_KEY'] = 'test-key';
+    // Reset the mock return value just in case
+    mockLoadServerHierarchicalMemory.mockResolvedValue({
+      memoryContent: '',
+      fileCount: 0,
+      filePaths: [],
+    });
+  });
+
+  afterEach(() => {
+    delete process.env['GEMINI_API_KEY'];
+    delete process.env['CHECKPOINTING'];
+  });
+
+  it('should disable checkpointing if git is not installed', async () => {
+    mockVerifyGitAvailability.mockResolvedValue(false);
+
+    await loadConfig(
+      mockSettings as unknown as Settings,
+      mockExtensionLoader,
+      'test-task',
+    );
+
+    expect(mockConfigConstructor).toHaveBeenCalledWith(
+      expect.objectContaining({
+        checkpointing: false,
+      }),
+    );
+  });
+
+  it('should enable checkpointing if git is installed', async () => {
+    mockVerifyGitAvailability.mockResolvedValue(true);
+
+    await loadConfig(
+      mockSettings as unknown as Settings,
+      mockExtensionLoader,
+      'test-task',
+    );
+
+    expect(mockConfigConstructor).toHaveBeenCalledWith(
+      expect.objectContaining({
+        checkpointing: true,
+      }),
+    );
+  });
+});

packages/a2a-server/src/config/config.ts

@@ -23,6 +23,7 @@ import {
   startupProfiler,
   PREVIEW_GEMINI_MODEL,
   homedir,
+  GitService,
 } from '@google/gemini-cli-core';
 
 import { logger } from '../utils/logger.js';
@@ -41,6 +42,19 @@ export async function loadConfig(
     settings.folderTrust === true ||
     process.env['GEMINI_FOLDER_TRUST'] === 'true';
 
+  let checkpointing = process.env['CHECKPOINTING']
+    ? process.env['CHECKPOINTING'] === 'true'
+    : settings.checkpointing?.enabled;
+
+  if (checkpointing) {
+    if (!(await GitService.verifyGitAvailability())) {
+      logger.warn(
+        '[Config] Checkpointing is enabled but git is not installed. Disabling checkpointing.',
+      );
+      checkpointing = false;
+    }
+  }
+
   const configParams: ConfigParameters = {
     sessionId: taskId,
     model: settings.general?.previewFeatures
@@ -79,9 +93,7 @@ export async function loadConfig(
     folderTrust,
     trustedFolder: true,
     extensionLoader,
-    checkpointing: process.env['CHECKPOINTING']
-      ? process.env['CHECKPOINTING'] === 'true'
-      : settings.checkpointing?.enabled,
+    checkpointing,
     previewFeatures: settings.general?.previewFeatures,
     interactive: true,
     enableInteractiveShell: true,

packages/core/src/services/gitService.test.ts

@@ -147,15 +147,13 @@ describe('GitService', () => {
 
   describe('verifyGitAvailability', () => {
     it('should resolve true if git --version command succeeds', async () => {
-      const service = new GitService(projectRoot, storage);
-      await expect(service.verifyGitAvailability()).resolves.toBe(true);
+      await expect(GitService.verifyGitAvailability()).resolves.toBe(true);
       expect(spawnAsync).toHaveBeenCalledWith('git', ['--version']);
     });
 
     it('should resolve false if git --version command fails', async () => {
       (spawnAsync as Mock).mockRejectedValue(new Error('git not found'));
-      const service = new GitService(projectRoot, storage);
-      await expect(service.verifyGitAvailability()).resolves.toBe(false);
+      await expect(GitService.verifyGitAvailability()).resolves.toBe(false);
     });
   });
 

packages/core/src/services/gitService.ts

@@ -27,7 +27,7 @@ export class GitService {
   }
 
   async initialize(): Promise<void> {
-    const gitAvailable = await this.verifyGitAvailability();
+    const gitAvailable = await GitService.verifyGitAvailability();
     if (!gitAvailable) {
       throw new Error(
         'Checkpointing is enabled, but Git is not installed. Please install Git or disable checkpointing to continue.',
@@ -42,7 +42,7 @@ export class GitService {
     }
   }
 
-  async verifyGitAvailability(): Promise<boolean> {
+  static async verifyGitAvailability(): Promise<boolean> {
     try {
       await spawnAsync('git', ['--version']);
       return true;