feat: VirtualBox.ExtensionPack 4.2.16

- uses VBoxManage to control VirtualBox

VirtualBox.ExtensionPack/tools/chocolateyUninstall.ps1

@@ -0,0 +1,50 @@
+$package = 'VirtualBox.ExtensionPack'
+$vboxName = 'Oracle VM VirtualBox Extension Pack'
+
+try {
+  # simulate the unix command for finding things in path
+  # http://stackoverflow.com/questions/63805/equivalent-of-nix-which-command-in-powershell
+  function Which([string]$cmd)
+  {
+    Get-Command -ErrorAction "SilentlyContinue" $cmd |
+      Select -ExpandProperty Definition
+  }
+
+  function Uninstall-ExtensionPack([string] $name)
+  {
+    $vboxManageDefault = Join-Path $Env:ProgramFiles 'Oracle\VirtualBox\VBoxManage.exe'
+
+    $vboxManage = (Which VBoxManage),
+      $vboxManageDefault |
+      ? { Test-Path $_ } |
+      Select -First 1
+
+    if (!$vboxManage)
+    {
+      throw 'Could not find VirtualBox VBoxManage.exe necessary to install extension pack'
+    }
+
+    &$vBoxManage extpack uninstall `"$name`"
+  }
+
+  Uninstall-ExtensionPack $vboxName
+
+  if ($LASTEXITCODE -ne 0)
+  {
+    Write-ChocolateyFailure $package @"
+Due to a VirtualBox bug, VBoxManage appears unresponsive.
+
+Please reboot the machine, and attempt to uninstall the VirtualBox extension pack
+using the command line:
+
+VBoxManage extpack uninstall `"$vboxName`"
+"@
+  }
+  else
+  {
+    Write-ChocolateySuccess $package
+  }
+} catch {
+  Write-ChocolateyFailure $package "$($_.Exception.Message)"
+  throw
+}