GetRelativePath should check if path is already relative before calli…

…ng [IO.Path]::GetRelativePath

eng/common/scripts/Save-Package-Properties.ps1

@@ -28,9 +28,9 @@ Verison property in that file.
 
 [CmdletBinding()]
 Param (
-  [Parameter(Mandatory=$True)]
+  [Parameter(Mandatory = $True)]
   [string] $serviceDirectory,
-  [Parameter(Mandatory=$True)]
+  [Parameter(Mandatory = $True)]
   [string] $outDirectory,
   [switch] $addDevVersion
 )
@@ -40,19 +40,16 @@ Param (
 function SetOutput($outputPath, $incomingPackageSpec) {
 
   # If there is an exsiting package info json file read that and set that as output object which gets properties updated here.
-  if (Test-Path $outputPath)
-  {
+  if (Test-Path $outputPath) {
     Write-Host "Found existing package info json."
     $outputObject = ConvertFrom-Json (Get-Content $outputPath -Raw)
   }
-  else
-  {
+  else {
     $outputObject = $incomingPackageSpec
   }
 
 
-  if ($addDevVersion)
-  {
+  if ($addDevVersion) {
     # Use the "Version" property which was provided by the incoming package spec
     # as the DevVersion. This may be overridden later.
     $outputObject.DevVersion = $incomingPackageSpec.Version
@@ -73,42 +70,44 @@ function GetRelativePath($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 "\\", '/'
   return $relativePath
 }
 
 $allPackageProperties = Get-AllPkgProperties $serviceDirectory
-if ($allPackageProperties)
-{
-    if (-not (Test-Path -Path $outDirectory))
-    {
-      New-Item -ItemType Directory -Force -Path $outDirectory
-    }
-    foreach($pkg in $allPackageProperties)
-    {
-        if ($pkg.IsNewSdk)
-        {
-            Write-Host "Package Name: $($pkg.Name)"
-            Write-Host "Package Version: $($pkg.Version)"
-            Write-Host "Package SDK Type: $($pkg.SdkType)"
-            Write-Host "Artifact Name: $($pkg.ArtifactName)"
-            Write-Host "Release date: $($pkg.ReleaseStatus)"
-            $configFilePrefix = $pkg.Name
-            if ($pkg.ArtifactName)
-            {
-              $configFilePrefix = $pkg.ArtifactName
-            }
-            $outputPath = Join-Path -Path $outDirectory "$configFilePrefix.json"
-            SetOutput $outputPath $pkg
-        }
+if ($allPackageProperties) {
+  if (-not (Test-Path -Path $outDirectory)) {
+    New-Item -ItemType Directory -Force -Path $outDirectory
+  }
+  foreach ($pkg in $allPackageProperties) {
+    if ($pkg.IsNewSdk) {
+      Write-Host "Package Name: $($pkg.Name)"
+      Write-Host "Package Version: $($pkg.Version)"
+      Write-Host "Package SDK Type: $($pkg.SdkType)"
+      Write-Host "Artifact Name: $($pkg.ArtifactName)"
+      Write-Host "Release date: $($pkg.ReleaseStatus)"
+      $configFilePrefix = $pkg.Name
+      if ($pkg.ArtifactName) {
+        $configFilePrefix = $pkg.ArtifactName
+      }
+      $outputPath = Join-Path -Path $outDirectory "$configFilePrefix.json"
+      SetOutput $outputPath $pkg
     }
+  }
 
-    Get-ChildItem -Path $outDirectory
+  Get-ChildItem -Path $outDirectory
 }
-else
-{
-    Write-Error "Package properties are not available for service directory $($serviceDirectory)"
-    exit 1
+else {
+  Write-Error "Package properties are not available for service directory $($serviceDirectory)"
+  exit 1
 }