From d32ef47e4adf9192cd52d0762002072c9df9070c Mon Sep 17 00:00:00 2001
From: James King <james.king@facepunchstudios.com>
Date: Fri, 21 Jun 2024 11:12:03 +0100
Subject: [PATCH] Avoid calling Path.GetFullPath for already-rooted paths

Fixes TestSubFileSystem.TestWatcherCaseSensitive
---
 src/Zio/FileSystems/PhysicalFileSystem.cs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/Zio/FileSystems/PhysicalFileSystem.cs b/src/Zio/FileSystems/PhysicalFileSystem.cs
index 1b1164b..ffc659f 100644
--- a/src/Zio/FileSystems/PhysicalFileSystem.cs
+++ b/src/Zio/FileSystems/PhysicalFileSystem.cs
@@ -977,7 +977,7 @@ protected override UPath ConvertPathFromInternalImpl(string innerPath)
             if (innerPath.StartsWith(@"\\", StringComparison.Ordinal) || innerPath.StartsWith(@"\?", StringComparison.Ordinal))
                 throw new NotSupportedException($"Path starting with `\\\\` or `\\?` are not supported -> `{innerPath}` ");
 
-            var absolutePath = Path.GetFullPath(innerPath);
+            var absolutePath = Path.IsPathRooted(innerPath) ? innerPath : Path.GetFullPath(innerPath);
             var driveIndex = absolutePath.IndexOf(":\\", StringComparison.Ordinal);
             if (driveIndex != 1)
                 throw new ArgumentException($"Expecting a drive for the path `{absolutePath}`");