From 276bf07dacf87b22a95f96d25670c3560141905f Mon Sep 17 00:00:00 2001
From: Daniel Jurek <djurek@microsoft.com>
Date: Tue, 12 Oct 2021 20:57:49 -0700
Subject: [PATCH] GetRelativePath should check if path is already relative
 before calling [IO.Path]::GetRelativePath

---
 eng/common/scripts/Save-Package-Properties.ps1 | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/eng/common/scripts/Save-Package-Properties.ps1 b/eng/common/scripts/Save-Package-Properties.ps1
index 10cb4158c01f..1b543ba37c5d 100644
--- a/eng/common/scripts/Save-Package-Properties.ps1
+++ b/eng/common/scripts/Save-Package-Properties.ps1
@@ -73,6 +73,14 @@ function GetRelativePath($path) {
   if (!$path) {
     return ''
   }
+
+  # If the path is already relative return the path. Calling `GetRelativePath`
+  # on a relative path converts the relative path to an absolute path based on
+  # the current working directory which can result in unexpected outputs.
+  if (![IO.Path]::IsPathRooted($path)) {
+    return $path
+  }
+
   $relativeTo = Resolve-Path $PSScriptRoot/../../../
   # Replace "\" with "/" so the path is valid across other platforms and tools
   $relativePath = [IO.Path]::GetRelativePath($relativeTo, $path) -replace "\\", '/'