Rebuild inside script and not output file

This moves the rebuild logic outside the generated `run.ts` to
make sure that itself is also generated from the latest version.
It also makes sure that the target is always up to date
when the script is involved.

Fixed: 458676656
Change-Id: I897b4d24add429148b7ccabb8e61041f2755981c
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/7572126
Commit-Queue: Nikolay Vitkov <nvitkov@chromium.org>
Reviewed-by: Philip Pfaffe <pfaffe@chromium.org>
Reviewed-by: Simon Zünd <szuend@chromium.org>

Author: Lightning00Blade

scripts/run_on_target.mjs

@@ -18,14 +18,24 @@ const argv = yargs(process.argv.slice(2))
   .option('target', {
     alias: 't',
     type: 'string',
-    default: getEnvString(ENV.TARGET, 'Default')
+    default: getEnvString(ENV.TARGET, 'Default'),
+  })
+  .option('skip-ninja', {
+    type: 'boolean',
+    default: false,
+  })
+  .option('debug', {
+    type: 'boolean',
+    default: false,
   })
   .help(false)
   .version(false)
   .parseSync();
 
 const target = argv.target;
 let script = argv.script;
+const skipNinja = argv.skipNinja;
+const debug = argv.debug;
 
 delete argv.target;
 delete argv.script;
@@ -69,22 +79,24 @@ if (
   );
   process.exit(1);
 }
-const scriptPath = path.resolve(cwd, script);
-if (!fs.existsSync(scriptPath)) {
-  console.error(`Script path ${scriptPath} does not exist, trying ninja...`);
-  const { error, status } = childProcess.spawnSync(
+
+if (!skipNinja) {
+  const { error, status, stdout, stderr } = childProcess.spawnSync(
     'autoninja',
     ['-C', cwd, script],
-    { stdio: 'inherit', cwd: sourceRoot },
+    { stdio: debug ? 'inherit' : 'pipe', cwd: sourceRoot },
   );
-  if (error) {
-    throw error;
-  }
-  if (status) {
-    process.exit(status);
+  if (status || error) {
+    console.log(stdout.toString());
+    console.log(stderr.toString());
+    if (error) {
+      console.error(error);
+    }
+    process.exit(status ?? 1);
   }
 }
 
+const scriptPath = path.resolve(cwd, script);
 const { argv0 } = process;
 const { status } = childProcess.spawnSync(
   argv0,