fix(core): prevent post install failures when socket path too long (n…

…rwl#27366)

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## Current Behavior
We communicate with sockets during graph construction. Its possible for
the assigned path to be too long and this can cause issues. The issues
present as a strange error with no helpful information.

## Expected Behavior
There is a helpful error message, and post-install is not interrupted

## Related Issue(s)
<!-- Please link the issue being fixed so it gets closed when this is
merged. -->

Fixes nrwl#27040

docs/shared/reference/environment-variables.md

@@ -32,6 +32,7 @@ The following environment variables are ones that you can set to change the beha
 | NX_LOAD_DOT_ENV_FILES             | boolean | If set to 'false', Nx will not load any environment files (e.g. `.local.env`, `.env.local`)                                                                                                                                    |
 | NX_NATIVE_FILE_CACHE_DIRECTORY    | string  | The cache for native `.node` files is stored under a global temp directory by default. Set this variable to use a different directory. This is interpreted as an absolute path.                                                |
 | NX_PLUGIN_NO_TIMEOUTS             | boolean | If set to `true`, plugin operations will not timeout                                                                                                                                                                           |
+| NX_SOCKET_DIRECTORY               | string  | Sets the directory that Nx will use when creating sockets to communicate with child processes. May be needed if the derived socket path is too long.                                                                           |
 
 Nx will set the following environment variables so they can be accessible within the process even outside of executors and generators.
 

packages/nx/bin/post-install.ts

@@ -56,3 +56,13 @@ function isMainNxPackage() {
   const thisNxPath = require.resolve('nx');
   return mainNxPath === thisNxPath;
 }
+
+process.on('uncaughtException', (e) => {
+  logger.verbose(e);
+  process.exit(0);
+});
+
+process.on('unhandledRejection', (e) => {
+  logger.verbose(e);
+  process.exit(0);
+});

packages/nx/src/daemon/socket-utils.ts

@@ -1,5 +1,5 @@
 import { unlinkSync } from 'fs';
-import { platform } from 'os';
+import { platform, tmpdir } from 'os';
 import { join, resolve } from 'path';
 import { getDaemonSocketDir, getSocketDir } from './tmp-dir';
 import { createSerializableError } from '../utils/serializable-error';
@@ -12,21 +12,44 @@ export const isWindows = platform() === 'win32';
  * See https://nodejs.org/dist/latest-v14.x/docs/api/net.html#net_identifying_paths_for_ipc_connections for a full breakdown
  * of OS differences between Unix domain sockets and named pipes.
  */
-export const getFullOsSocketPath = () =>
-  isWindows
-    ? '\\\\.\\pipe\\nx\\' + resolve(getDaemonSocketDir())
-    : resolve(getDaemonSocketDir());
+export const getFullOsSocketPath = () => {
+  const path = resolve(getDaemonSocketDir());
+
+  assertValidSocketPath(path);
+
+  return isWindows ? '\\\\.\\pipe\\nx\\' + path : path;
+};
 
 export const getForkedProcessOsSocketPath = (id: string) => {
   let path = resolve(join(getSocketDir(), 'fp' + id + '.sock'));
-  return isWindows ? '\\\\.\\pipe\\nx\\' + resolve(path) : resolve(path);
+
+  assertValidSocketPath(path);
+
+  return isWindows ? '\\\\.\\pipe\\nx\\' + path : path;
 };
 
 export const getPluginOsSocketPath = (id: string) => {
   let path = resolve(join(getSocketDir(true), 'plugin' + id + '.sock'));
-  return isWindows ? '\\\\.\\pipe\\nx\\' + resolve(path) : resolve(path);
+
+  assertValidSocketPath(path);
+
+  return isWindows ? '\\\\.\\pipe\\nx\\' + path : path;
 };
 
+function assertValidSocketPath(path: string) {
+  if (path.length > 95) {
+    throw new Error(
+      [
+        'Attempted to open socket that exceeds the maximum socket length.',
+        '',
+        `Set NX_SOCKET_DIR to a shorter path (e.g. ${
+          isWindows ? '%TMP%/nx-tmp' : '/tmp/nx-tmp'
+        }) to avoid this issue.`,
+      ].join('\n')
+    );
+  }
+}
+
 export function killSocketOrPath(): void {
   try {
     unlinkSync(getFullOsSocketPath());

packages/nx/src/daemon/tmp-dir.ts

@@ -61,9 +61,11 @@ function socketDirName() {
 export function getSocketDir(alreadyUnique = false) {
   try {
     const dir =
+      process.env.NX_SOCKET_DIR ??
       process.env.NX_DAEMON_SOCKET_DIR ??
       (alreadyUnique ? tmpdir : socketDirName());
     ensureDirSync(dir);
+
     return dir;
   } catch (e) {
     return DAEMON_DIR_FOR_CURRENT_WORKSPACE;