Merge pull request #1623 from PowerShell/jimtru/PSDriveFreeSpaceFix

Get-PSDrive should report proper free space on all platforms

src/System.Management.Automation/engine/Types_Ps1Xml.generated.cs

@@ -52,18 +52,15 @@ namespace System.Management.Automation.Runspaces
           if($this.Provider.ImplementingType -eq
           [Microsoft.PowerShell.Commands.FileSystemProvider])
           {
-          $driveRoot = ([System.IO.DirectoryInfo] $this.Root).Name.Replace('\','')
-          $drive = Get-CimInstance Win32_LogicalDisk -Filter ""DeviceId='$driveRoot'""
-          $drive.Size - $drive.FreeSpace
+          $driveInfo = [System.IO.DriveInfo]::New($this.Root)
+          if ( $driveInfo.IsReady ) { $driveInfo.TotalSize - $driveInfo.AvailableFreeSpace }
           }"), null));
             td4.Members.Add("Free",
                 new ScriptPropertyData(@"Free", GetScriptBlock(@"## Ensure that this is a FileSystem drive
           if($this.Provider.ImplementingType -eq
           [Microsoft.PowerShell.Commands.FileSystemProvider])
           {
-          $driveRoot = ([System.IO.DirectoryInfo] $this.Root).Root.Name.Replace('\','')
-          $drive = Get-CimInstance Win32_LogicalDisk -Filter ""DeviceId='$driveRoot'""
-          $drive.FreeSpace
+          [System.IO.DriveInfo]::New($this.Root).AvailableFreeSpace
           }"), null));
             yield return td4;
 

test/powershell/Modules/Microsoft.PowerShell.Management/Get-PSDrive.Tests.ps1

@@ -44,4 +44,12 @@ Describe "Get-PSDrive" -Tags "CI" {
 	!(Get-PSDrive fake -ErrorAction SilentlyContinue) | Should Be $True
 	Get-PSDrive fake -ErrorAction SilentlyContinue    | Should BeNullOrEmpty
     }
+    It "Should be able to determine the amount of free space of a drive" {
+        $dInfo = Get-PSDrive TESTDRIVE
+        $dInfo.Free -ge 0 | Should be $true
+    }
+    It "Should be able to determine the amount of Used space of a drive" {
+        $dInfo = Get-PSDrive TESTDRIVE
+        $dInfo.Used -ge 0 | Should be $true
+    }
 }