fix: don't fail when the pnpm CLI executed through piping

.changeset/soft-chairs-sort.md

@@ -0,0 +1,6 @@
+---
+"@pnpm/cli-meta": patch
+"@pnpm/store-connection-manager": patch
+---
+
+Don't fail when the code is executed through piping to Node's stdin.

packages/cli-meta/src/index.ts

@@ -7,15 +7,19 @@ const defaultManifest = {
   version: '0.0.0',
 }
 let pkgJson
-try {
-  pkgJson = {
-    ...defaultManifest,
-    ...loadJsonFile.sync<DependencyManifest>(
-      path.join(path.dirname(require.main!.filename), '../package.json')
-    ),
-  }
-} catch (err) {
+if (!require.main) {
   pkgJson = defaultManifest
+} else {
+  try {
+    pkgJson = {
+      ...defaultManifest,
+      ...loadJsonFile.sync<DependencyManifest>(
+        path.join(path.dirname(require.main.filename), '../package.json')
+      ),
+    }
+  } catch (err) {
+    pkgJson = defaultManifest
+  }
 }
 
 const packageManager = {

packages/pnpm/test/cli.ts

@@ -135,12 +135,26 @@ test('exit code from plugin is used to end the process', () => {
   expect(result.stdout.toString()).toMatch(/is-positive/)
 })
 
+const PNPM_CLI = path.join(__dirname, '../dist/pnpm.js')
+
 test('the bundled CLI is independent', async () => {
   const project = prepare()
 
-  await fs.copyFile(path.join(__dirname, '../dist/pnpm.js'), 'pnpm.js')
+  await fs.copyFile(PNPM_CLI, 'pnpm.js')
 
   await execa('node', ['./pnpm.js', 'add', 'is-positive'])
 
   await project.has('is-positive')
 })
+
+test('the bundled CLI can be executed from stdin', async () => {
+  const project = prepare()
+
+  const nodeProcess = execa('node', ['-', 'add', 'is-positive'])
+
+  fs.createReadStream(PNPM_CLI).pipe(nodeProcess.stdin!)
+
+  await nodeProcess
+
+  await project.has('is-positive')
+})

packages/store-connection-manager/src/runServerInBackground.ts

@@ -1,7 +1,9 @@
+import PnpmError from '@pnpm/error'
 import diable = require('@zkochan/diable')
 
-const pnpm = require.main!.filename
-
 export default (storePath: string) => {
-  return diable.daemonize(pnpm, ['server', 'start', '--store-dir', storePath], { stdio: 'inherit' })
+  if (!require.main) {
+    throw new PnpmError('CANNOT_START_SERVER', 'pnpm server cannot be started when pnpm is streamed to Node.js')
+  }
+  return diable.daemonize(require.main.filename, ['server', 'start', '--store-dir', storePath], { stdio: 'inherit' })
 }