From 07c5678bd1934af716711dbb7879fd378fe40ce5 Mon Sep 17 00:00:00 2001
From: cyberavyss <139671966+cyberavyss@users.noreply.github.com>
Date: Tue, 8 Jul 2025 19:40:55 +0300
Subject: [PATCH] Syncronously create the symlink to the requirements layer zip

Currently, the symlink is created asynchronously. On a 14-CPUs MacBook Pro the current code leads to a raise condition - the symlink not yet existing during subsequent attempy to use it, but existing afterward. This happens in ~90% of the invocations:

Serverless: Packaging Python Requirements Lambda Layer...
Serverless: Found cached Python Requirements Lambda Layer file

 Exception -----------------------------------------------

  OperationalError: ENOENT: no such file or directory, open '/Users/XXXX/git/YYYY/.serverless/pythonRequirements.zip'

Patching the code locally as proposed, fixes the problem.

Also, making the symlinkSync() call will be consistent with making the copySync() call in the adjacent if(...) statement branch.
---
 lib/layer.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/layer.js b/lib/layer.js
index 6fe9ca4c..b7d7decb 100644
--- a/lib/layer.js
+++ b/lib/layer.js
@@ -51,7 +51,7 @@ function zipRequirements() {
       if (process.platform === 'win32') {
         fse.copySync(zipCachePath, targetZipPath);
       } else {
-        fse.symlink(zipCachePath, targetZipPath, 'file');
+        fse.symlinkSync(zipCachePath, targetZipPath, 'file');
       }
     }
   });