fix postinstall

Author: greggman

build/postinstall.js

@@ -1,18 +1,32 @@
 import child_process from 'node:child_process';
 
+import DEBUG from 'debug';
+
 import {execute} from './execute.js';
 import {isMac} from './constants.js';
+import {exists} from './utils.js';
+
+const debug = DEBUG('postinstall');
 
 async function main() {
   if (isMac) {
-    const result = child_process.execFileSync('xattr', ['-l', 'dist/darwin-universal.dawn.node']);
-    if (!result.toString().includes('com.apple.quarantine')) {
+    const dawnNode = 'dist/darwin-universal.dawn.node';
+    const attribute = 'com.apple.quarantine'
+    if (!exists(dawnNode)) {
+      debug(`${dawnNode} does not exist`);
+      return;
+    }
+
+    const result = child_process.execFileSync('xattr', ['-l', dawnNode], {encoding: 'utf8'});
+    if (!result.includes(attribute)) {
+      debug(`${dawnNode} does not have attribute: ${attribute}`);
       return;
     }
 
     // The user has already indicated they trust this by installing it,
     // This executable can not do anything a JavaScript node script couldn't also do.
-    await execute('xattr', ['-d', 'com.apple.quarantine', 'dist/darwin-universal.dawn.node']);
+    await execute('xattr', ['-d', attribute, dawnNode]);
+    console.log(`removed attribute: ${attribute}`);
   }
 }