fix regression, auto readlink on symlinks again

packages/artifact/src/internal/upload/upload-zip-specification.ts

@@ -13,6 +13,12 @@ export interface UploadZipSpecification {
    * The destination path in a zip for a file
    */
   destinationPath: string
+
+  /**
+   * Information about the file
+   * https://nodejs.org/api/fs.html#class-fsstats
+   */
+  stats: fs.Stats
 }
 
 /**
@@ -75,10 +81,11 @@ export function getUploadZipSpecification(
           - file3.txt
   */
   for (let file of filesToZip) {
-    if (!fs.existsSync(file)) {
+    const stats = fs.lstatSync(file, {throwIfNoEntry: false})
+    if (!stats) {
       throw new Error(`File ${file} does not exist`)
     }
-    if (!fs.statSync(file).isDirectory()) {
+    if (!stats.isDirectory()) {
       // Normalize and resolve, this allows for either absolute or relative paths to be used
       file = normalize(file)
       file = resolve(file)
@@ -94,7 +101,8 @@ export function getUploadZipSpecification(
 
       specification.push({
         sourcePath: file,
-        destinationPath: uploadPath
+        destinationPath: uploadPath,
+        stats
       })
     } else {
       // Empty directory
@@ -103,7 +111,8 @@ export function getUploadZipSpecification(
 
       specification.push({
         sourcePath: null,
-        destinationPath: directoryPath
+        destinationPath: directoryPath,
+        stats
       })
     }
   }

packages/artifact/src/internal/upload/zip.ts

@@ -1,4 +1,5 @@
 import * as stream from 'stream'
+import {readlink} from 'fs/promises'
 import * as archiver from 'archiver'
 import * as core from '@actions/core'
 import {UploadZipSpecification} from './upload-zip-specification'
@@ -42,8 +43,14 @@ export async function createZipUploadStream(
 
   for (const file of uploadSpecification) {
     if (file.sourcePath !== null) {
-      // Add a normal file to the zip
-      zip.file(file.sourcePath, {
+      // Check if symlink and resolve the source path
+      let sourcePath = file.sourcePath
+      if (file.stats.isSymbolicLink()) {
+        sourcePath = await readlink(file.sourcePath)
+      }
+
+      // Add the file to the zip
+      zip.file(sourcePath, {
         name: file.destinationPath
       })
     } else {