fix(hooks): prevent SessionEnd from firing twice in non-interactive mode (#22139)

Co-authored-by: Tommaso Sciortino <sciortino@gmail.com>

packages/cli/src/gemini.tsx

@@ -671,11 +671,6 @@ export async function main() {
       }
     }
 
-    // Register SessionEnd hook for graceful exit
-    registerCleanup(async () => {
-      await config.getHookSystem()?.fireSessionEndEvent(SessionEndReason.Exit);
-    });
-
     if (!input) {
       debugLogger.error(
         `No input provided via stdin. Input can be provided by piping data into gemini or using the --prompt option.`,

packages/cli/src/gemini_cleanup.test.tsx

@@ -6,7 +6,12 @@
 
 import { describe, it, expect, vi, beforeEach, afterEach } from 'vitest';
 import { main } from './gemini.js';
-import { debugLogger, type Config } from '@google/gemini-cli-core';
+import {
+  debugLogger,
+  SessionEndReason,
+  type Config,
+  type HookSystem,
+} from '@google/gemini-cli-core';
 
 vi.mock('@google/gemini-cli-core', async (importOriginal) => {
   const actual =
@@ -197,11 +202,11 @@ describe('gemini.tsx main function cleanup', () => {
       setValue: vi.fn(),
       forScope: () => ({ settings: {}, originalSettings: {}, path: '' }),
       errors: [],
-    } as any); // eslint-disable-line @typescript-eslint/no-explicit-any
+    } as unknown as ReturnType<typeof loadSettings>);
 
     vi.mocked(parseArguments).mockResolvedValue({
       promptInteractive: false,
-    } as any); // eslint-disable-line @typescript-eslint/no-explicit-any
+    } as unknown as Awaited<ReturnType<typeof parseArguments>>);
     vi.mocked(loadCliConfig).mockResolvedValue({
       isInteractive: vi.fn(() => false),
       getQuestion: vi.fn(() => 'test'),
@@ -238,7 +243,8 @@ describe('gemini.tsx main function cleanup', () => {
       setTerminalBackground: vi.fn(),
       refreshAuth: vi.fn(),
       getRemoteAdminSettings: vi.fn(() => undefined),
-    } as any); // eslint-disable-line @typescript-eslint/no-explicit-any
+      getUseAlternateBuffer: vi.fn(() => false),
+    } as unknown as Config);
 
     await main();
 
@@ -248,4 +254,80 @@ describe('gemini.tsx main function cleanup', () => {
       expect.objectContaining({ message: 'Cleanup failed' }),
     );
   });
+
+  it('should register SessionEnd hook exactly once in non-interactive mode', async () => {
+    const { loadCliConfig, parseArguments } = await import(
+      './config/config.js'
+    );
+    const { registerCleanup } = await import('./utils/cleanup.js');
+
+    const mockHookSystem = {
+      fireSessionEndEvent: vi.fn().mockResolvedValue(undefined),
+      fireSessionStartEvent: vi.fn().mockResolvedValue(undefined),
+    } as unknown as HookSystem;
+
+    vi.mocked(parseArguments).mockResolvedValue({
+      promptInteractive: false,
+    } as unknown as Awaited<ReturnType<typeof parseArguments>>);
+
+    vi.mocked(loadCliConfig).mockResolvedValue(
+      buildMockConfig({
+        getHookSystem: vi.fn(() => mockHookSystem),
+      }),
+    );
+
+    vi.spyOn(process, 'exit').mockImplementation(() => undefined as never);
+
+    await main();
+
+    const registeredCallbacks = vi
+      .mocked(registerCleanup)
+      .mock.calls.map(([fn]) => fn);
+    for (const fn of registeredCallbacks) await fn();
+    expect(mockHookSystem.fireSessionEndEvent).toHaveBeenCalledTimes(1);
+    expect(mockHookSystem.fireSessionEndEvent).toHaveBeenCalledWith(
+      SessionEndReason.Exit,
+    );
+  });
+
+  function buildMockConfig(overrides: Partial<Config> = {}): Config {
+    return {
+      isInteractive: vi.fn(() => false),
+      getQuestion: vi.fn(() => 'test'),
+      getSandbox: vi.fn(() => false),
+      getDebugMode: vi.fn(() => false),
+      getPolicyEngine: vi.fn(),
+      getMessageBus: () => ({ subscribe: vi.fn() }),
+      getEnableHooks: vi.fn(() => true),
+      getHookSystem: vi.fn(() => undefined),
+      initialize: vi.fn(),
+      storage: { initialize: vi.fn().mockResolvedValue(undefined) },
+      getContentGeneratorConfig: vi.fn(),
+      getMcpClientManager: vi.fn(),
+      getIdeMode: vi.fn(() => false),
+      getAcpMode: vi.fn(() => false),
+      getScreenReader: vi.fn(() => false),
+      getGeminiMdFileCount: vi.fn(() => 0),
+      getProjectRoot: vi.fn(() => '/'),
+      getListExtensions: vi.fn(() => false),
+      getListSessions: vi.fn(() => false),
+      getDeleteSession: vi.fn(() => undefined),
+      getToolRegistry: vi.fn(),
+      getExtensions: vi.fn(() => []),
+      getModel: vi.fn(() => 'gemini-pro'),
+      getEmbeddingModel: vi.fn(() => 'embedding-001'),
+      getApprovalMode: vi.fn(() => 'default'),
+      getCoreTools: vi.fn(() => []),
+      getTelemetryEnabled: vi.fn(() => false),
+      getTelemetryLogPromptsEnabled: vi.fn(() => false),
+      getFileFilteringRespectGitIgnore: vi.fn(() => true),
+      getOutputFormat: vi.fn(() => 'text'),
+      getUsageStatisticsEnabled: vi.fn(() => false),
+      setTerminalBackground: vi.fn(),
+      refreshAuth: vi.fn(),
+      getRemoteAdminSettings: vi.fn(() => undefined),
+      getUseAlternateBuffer: vi.fn(() => false),
+      ...overrides,
+    } as unknown as Config;
+  }
 });