Resolve temp dir symlink on macOS

Author: jjonescz

src/Cli/Microsoft.DotNet.Cli.Utils/PathUtility.cs

@@ -416,4 +416,17 @@ public static string GetDirectorySeparatorChar()
 
         return null;
     }
+
+#if NET
+    public static string ResolveDirectoryLinkTarget(string path)
+    {
+        var info = new DirectoryInfo(path);
+        if (info.ResolveLinkTarget(returnFinalTarget: true) is { } linkTarget)
+        {
+            return linkTarget.FullName;
+        }
+
+        return info.FullName;
+    }
+#endif
 }

test/dotnet.Tests/CommandTests/Run/RunFileTests.cs

@@ -78,7 +78,7 @@ public static string GetMessage()
     /// Used when we need an out-of-tree base test directory to avoid having implicit build files
     /// like Directory.Build.props in scope and negating the optimizations we want to test.
     /// </summary>
-    private static readonly string s_outOfTreeBaseDirectory = Path.Join(Path.GetTempPath(), "dotnetSdkTests");
+    private static readonly string s_outOfTreeBaseDirectory = PathUtility.ResolveDirectoryLinkTarget(Path.Join(Path.GetTempPath(), "dotnetSdkTests"));
 
     private static bool HasCaseInsensitiveFileSystem
     {
@@ -1611,7 +1611,6 @@ Hello from {programName}
                 """);
 
         // Backup the artifacts directory.
-        Directory.CreateDirectory(Path.GetDirectoryName(artifactsBackupDir)!);
         Directory.Move(artifactsDir, artifactsBackupDir);
 
         // Build using MSBuild.