Add test coverage for permission behaviour in SymbolicLinkPreservingTar (#104398)

Author: breskeby

build-tools-internal/src/integTest/groovy/org/elasticsearch/gradle/internal/SymbolicLinkPreservingTarFuncTest.groovy

@@ -36,6 +36,11 @@ class SymbolicLinkPreservingTarFuncTest extends AbstractGradleFuncTest {
         final Path linkToRealFolder = archiveSourceRoot.resolve("link-to-real-folder");
         Files.createSymbolicLink(linkToRealFolder, Paths.get("./real-folder"));
 
+        final Path realFolder2 = testProjectDir.getRoot().toPath().resolve("real-folder2")
+        final Path realFolderSub = realFolder2.resolve("sub")
+        Files.createDirectory(realFolder2);
+        Files.createDirectory(realFolderSub);
+
         buildFile << """
 import org.elasticsearch.gradle.internal.SymbolicLinkPreservingTar
 
@@ -56,6 +61,12 @@ tasks.register("buildBZip2Tar", SymbolicLinkPreservingTar) { SymbolicLinkPreserv
   tar.compression = Compression.BZIP2
   tar.preserveFileTimestamps = ${preserverTimestamp}
   from fileTree("archiveRoot")
+
+  into('config') {
+    dirMode 0750
+    fileMode 0660
+    from "real-folder2"
+  }
 }
 """
         when:
@@ -117,15 +128,22 @@ tasks.register("buildTar", SymbolicLinkPreservingTar) { SymbolicLinkPreservingTa
             while (entry != null) {
                 if (entry.getName().equals("real-folder/")) {
                     assert entry.isDirectory()
+                    assert entry.getMode() == 16877
                     realFolderEntry = true
-                } else if (entry.getName().equals("real-folder/file")) {
+                }  else if (entry.getName().equals("real-folder/file")) {
                     assert entry.isFile()
                     fileEntry = true
                 } else if (entry.getName().equals("real-folder/link-to-file")) {
                     assert entry.isSymbolicLink()
                     assert normalized(entry.getLinkName()) == "./file"
                     linkToFileEntry = true
-                } else if (entry.getName().equals("link-in-folder/")) {
+                } else if (entry.getName().equals("config/")) {
+                    assert entry.isDirectory()
+                    assert entry.getMode() == 16877
+                } else if (entry.getName().equals("config/sub/")) {
+                    assert entry.isDirectory()
+                    assert entry.getMode() == 16872
+                }else if (entry.getName().equals("link-in-folder/")) {
                     assert entry.isDirectory()
                     linkInFolderEntry = true
                 } else if (entry.getName().equals("link-in-folder/link-to-file")) {