fix(cli): trim overlong session names to fit unix socket path limit

packages/playwright-core/src/serverRegistry.ts

@@ -171,7 +171,7 @@ class ServerRegistry extends EventEmitter {
   }
 
   private _browsersDir() {
-    return process.env.PLAYWRIGHT_SERVER_REGISTRY || registryDirectory;
+    return process.env.PWTEST_SERVER_REGISTRY || registryDirectory;
   }
 
   private _startWatcher() {

packages/playwright-core/src/tools/cli-client/registry.ts

@@ -143,8 +143,8 @@ export class Registry {
 }
 
 export const baseDaemonDir = (() => {
-  if (process.env.PLAYWRIGHT_DAEMON_SESSION_DIR)
-    return process.env.PLAYWRIGHT_DAEMON_SESSION_DIR;
+  if (process.env.PWTEST_DAEMON_SESSION_DIR)
+    return process.env.PWTEST_DAEMON_SESSION_DIR;
 
   let localCacheDir: string | undefined;
   if (process.platform === 'linux')

packages/playwright/src/util.ts

@@ -186,16 +186,6 @@ export function expectTypes(receiver: any, types: ('APIResponse' | 'Page' | 'Loc
 
 export const windowsFilesystemFriendlyLength = 60;
 
-export function trimLongString(s: string, length = 100) {
-  if (s.length <= length)
-    return s;
-  const hash = calculateSha1(s);
-  const middle = `-${hash.substring(0, 5)}-`;
-  const start = Math.floor((length - middle.length) / 2);
-  const end = length - middle.length - start;
-  return s.substring(0, start) + middle + s.slice(-end);
-}
-
 export function addSuffixToFilePath(filePath: string, suffix: string): string {
   const ext = path.extname(filePath);
   const base = filePath.substring(0, filePath.length - ext.length);

packages/playwright/src/worker/testInfo.ts

@@ -22,11 +22,11 @@ import { captureRawStack, stringifyStackFrames } from '@isomorphic/stackTrace';
 import { escapeWithQuotes } from '@isomorphic/stringUtils';
 import { monotonicTime } from '@isomorphic/time';
 import { createGuid } from '@utils/crypto';
-import { sanitizeForFilePath } from '@utils/fileUtils';
+import { sanitizeForFilePath, trimLongString } from '@utils/fileUtils';
 import { currentZone } from '@utils/zones';
 
 import { TimeoutManager, TimeoutManagerError } from './timeoutManager';
-import { addSuffixToFilePath, filteredStackTrace, getContainedPath, normalizeAndSaveAttachment, sanitizeFilePathBeforeExtension, trimLongString, windowsFilesystemFriendlyLength } from '../util';
+import { addSuffixToFilePath, filteredStackTrace, getContainedPath, normalizeAndSaveAttachment, sanitizeFilePathBeforeExtension, windowsFilesystemFriendlyLength } from '../util';
 import { TestTracing } from './testTracing';
 import { testInfoError } from './util';
 import { ipc, transform } from '../common';

packages/utils/fileUtils.ts

@@ -78,6 +78,16 @@ export function sanitizeForFilePath(s: string) {
   return s.replace(/[\x00-\x2C\x2E-\x2F\x3A-\x40\x5B-\x60\x7B-\x7F]+/g, '-');
 }
 
+export function trimLongString(s: string, length = 100) {
+  if (s.length <= length)
+    return s;
+  const hash = calculateSha1(s);
+  const middle = `-${hash.substring(0, 5)}-`;
+  const start = Math.floor((length - middle.length) / 2);
+  const end = length - middle.length - start;
+  return s.substring(0, start) + middle + s.slice(-end);
+}
+
 export function isPathInside(root: string, candidate: string): boolean {
   const resolvedRoot = path.resolve(root);
   const resolvedCandidate = path.resolve(candidate);
@@ -104,16 +114,24 @@ export function toPosixPath(aPath: string): string {
   return aPath.split(path.sep).join(path.posix.sep);
 }
 
+// macOS sun_path is 104 bytes (Linux is 108) including the NUL terminator. Use the lower bound.
+const UNIX_SOCKET_PATH_MAX = 103;
+
 export function makeSocketPath(domain: string, name: string): string {
   const userNameHash = calculateSha1(process.env.USERNAME || process.env.USER || 'default').slice(0, 8);
   if (process.platform === 'win32') {
-    const socketsDir = process.env.PLAYWRIGHT_SOCKETS_DIR;
+    const socketsDir = process.env.PWTEST_SOCKETS_DIR;
     const suffix = socketsDir ? `-${calculateSha1(socketsDir).slice(0, 8)}` : '';
     return `\\\\.\\pipe\\pw-${userNameHash}-${domain}-${name}${suffix}`;
   }
-  const baseDir = process.env.PLAYWRIGHT_SOCKETS_DIR || path.join(os.tmpdir(), `pw-${userNameHash}`);
+  const baseDir = process.env.PWTEST_SOCKETS_DIR || path.join(os.tmpdir(), `pw-${userNameHash}`);
   const dir = path.join(baseDir, domain);
-  const result = path.join(dir, `${name}.sock`);
+  const suffix = '.sock';
+  const maxNameLength = UNIX_SOCKET_PATH_MAX - dir.length - path.sep.length - suffix.length;
+  if (maxNameLength < 1)
+    throw new Error(`Socket directory path is too long (${dir.length} chars); set PWTEST_SOCKETS_DIR to a shorter location.`);
+  const fsFriendlyName = trimLongString(sanitizeForFilePath(name), maxNameLength);
+  const result = path.join(dir, `${fsFriendlyName}${suffix}`);
   fs.mkdirSync(dir, { recursive: true });
   return result;
 }

tests/extension/extension-fixtures.ts

@@ -146,11 +146,11 @@ export const testWithOldExtensionVersion = test.extend({
 
 function cliEnv() {
   return {
-    PLAYWRIGHT_SERVER_REGISTRY: test.info().outputPath('registry'),
-    PLAYWRIGHT_DAEMON_SESSION_DIR: test.info().outputPath('daemon'),
+    PWTEST_SERVER_REGISTRY: test.info().outputPath('registry'),
+    PWTEST_DAEMON_SESSION_DIR: test.info().outputPath('daemon'),
     // Short path because macOS caps unix socket paths at 104 chars; the
     // long `project.outputDir` path overflows and causes EADDRINUSE.
-    PLAYWRIGHT_SOCKETS_DIR: path.join(os.tmpdir(), 'pwmcp-sock', String(test.info().parallelIndex)),
+    PWTEST_SOCKETS_DIR: path.join(os.tmpdir(), 'pwmcp-sock', String(test.info().parallelIndex)),
   };
 }
 

tests/library/browser-server.spec.ts

@@ -22,13 +22,13 @@ import { browserTest as it, expect } from '../config/browserTest';
 it.skip(({ mode }) => mode !== 'default');
 
 it.beforeEach(({}, testInfo) => {
-  process.env.PLAYWRIGHT_SERVER_REGISTRY = testInfo.outputPath('registry');
+  process.env.PWTEST_SERVER_REGISTRY = testInfo.outputPath('registry');
 });
 
 it('should start and stop pipe server', async ({ browserType, browser }) => {
   const serverInfo = await browser.bind('default', {});
   expect(serverInfo).toEqual(expect.objectContaining({
-    endpoint: expect.stringMatching(/browser@/),
+    endpoint: expect.stringMatching(/browser-/),
   }));
 
   const browser2 = await browserType.connect(serverInfo.endpoint);

tests/mcp/cli-fixtures.ts

@@ -119,10 +119,10 @@ export const test = baseTest.extend<{
 
 function cliEnv() {
   return {
-    PLAYWRIGHT_SERVER_REGISTRY: test.info().outputPath('registry'),
+    PWTEST_SERVER_REGISTRY: test.info().outputPath('registry'),
     PWTEST_DASHBOARD_SETTINGS_FILE: test.info().outputPath('dashboard.settings.json'),
-    PLAYWRIGHT_DAEMON_SESSION_DIR: test.info().outputPath('daemon'),
-    PLAYWRIGHT_SOCKETS_DIR: path.join(os.tmpdir(), 'ds-' + crypto.createHash('sha1').update(test.info().outputDir).digest('hex').slice(0, 16)),
+    PWTEST_DAEMON_SESSION_DIR: test.info().outputPath('daemon'),
+    PWTEST_SOCKETS_DIR: path.join(os.tmpdir(), 'ds-' + crypto.createHash('sha1').update(test.info().outputDir).digest('hex').slice(0, 16)),
     PWTEST_CLI_CHANNEL_SCAN_DISABLED_FOR_TEST: '1',
   };
 }

tests/mcp/cli-misc.spec.ts

@@ -67,3 +67,12 @@ test('install handles browser detection', async ({ cli }) => {
   if (foundMatch?.[1] !== 'chrome')
     expect(output).toContain(`Created default config for ${foundMatch?.[1] ?? 'chromium'}.`);
 });
+
+test('open with very long session name (issue 40878)', async ({ cli, server }) => {
+  // Long session names push the unix socket path past sun_path's 104-byte limit on macOS.
+  const longSessionName = 'awesome-coding-agent-orchestrators-with-an-overlong-suffix-for-testing';
+  const result = await cli(`-s=${longSessionName}`, 'open', server.PREFIX);
+  expect(result.error).toBe('');
+  expect(result.exitCode).toBe(0);
+  expect(result.output).toContain('Page URL');
+});

tests/mcp/cli-session.spec.ts

@@ -268,7 +268,7 @@ test('older client with newer daemon - list shows incompatible warning', async (
 test.describe('browser server', () => {
   test.beforeEach(async ({ mcpBrowser }, testInfo) => {
     test.skip(!['chrome', 'chromium', 'webkit', 'firefox'].includes(mcpBrowser));
-    process.env.PLAYWRIGHT_SERVER_REGISTRY = testInfo.outputPath('registry');
+    process.env.PWTEST_SERVER_REGISTRY = testInfo.outputPath('registry');
   });
 
   test('list browser servers', async ({ cli, mcpBrowser }) => {

tests/mcp/dashboard.spec.ts

@@ -30,7 +30,7 @@ function displayPath(p: string): string {
 }
 
 test.beforeEach(({}, testInfo) => {
-  process.env.PLAYWRIGHT_SERVER_REGISTRY = testInfo.outputPath('registry');
+  process.env.PWTEST_SERVER_REGISTRY = testInfo.outputPath('registry');
 });
 
 test('should show browser session chip', async ({ cli, server, startDashboardServer }) => {