fix: propagate execArgv (#5510)

* Use fork instead of spawn

We no longer do in-place updating so no need for the spawn.  The
advantage of a fork is that it preserves flags like --prof which you can
use to profile code-server.

Also I am not sure the comment about not being able to reload in place
with fork was even true to begin with.

* Refresh heartbeat patch

Seems to have gotten out of date a little.

* Propagate execArgv to extension host

This will let us profile the extension host.

patches/exec-argv.diff

@@ -0,0 +1,17 @@
+Preserve process.execArgv
+
+This ensures flags like --prof are passed down so we can profile everything.
+
+Index: code-server/lib/vscode/src/vs/server/node/extensionHostConnection.ts
+===================================================================
+--- code-server.orig/lib/vscode/src/vs/server/node/extensionHostConnection.ts
++++ code-server/lib/vscode/src/vs/server/node/extensionHostConnection.ts
+@@ -228,7 +228,7 @@ export class ExtensionHostConnection {
+ 
+ 	public async start(startParams: IRemoteExtensionHostStartParams): Promise<void> {
+ 		try {
+-			let execArgv: string[] = [];
++			let execArgv: string[] = process.execArgv ? process.execArgv.filter(a => !/^--inspect(-brk)?=/.test(a)) : [];
+ 			if (startParams.port && !(<any>process).pkg) {
+ 				execArgv = [`--inspect${startParams.break ? '-brk' : ''}=${startParams.port}`];
+ 			}

patches/heartbeat.diff

@@ -15,7 +15,7 @@ Index: code-server/lib/vscode/src/vs/base/parts/ipc/common/ipc.net.ts
  
  export const enum SocketDiagnosticsEventType {
  	Created = 'created',
-@@ -828,6 +829,19 @@ export class PersistentProtocol implemen
+@@ -829,6 +830,19 @@ export class PersistentProtocol implemen
  		this._socketDisposables.push(this._socketWriter);
  		this._socketReader = new ProtocolReader(this._socket);
  		this._socketDisposables.push(this._socketReader);

patches/series

@@ -21,3 +21,4 @@ telemetry.diff
 display-language.diff
 cli-window-open.diff
 heartbeat.diff
+exec-argv.diff

src/node/wrapper.ts

@@ -317,8 +317,7 @@ export class ParentProcess extends Process {
   }
 
   private spawn(): cp.ChildProcess {
-    // Use spawn (instead of fork) to use the new binary in case it was updated.
-    return cp.spawn(process.argv[0], process.argv.slice(1), {
+    return cp.fork(path.join(__dirname, "entry"), {
       env: {
         ...process.env,
         CODE_SERVER_PARENT_PID: process.pid.toString(),