From 948a07074fc9edb5d0cc822a141b9f29381c1a4b Mon Sep 17 00:00:00 2001
From: Thijs Schreijer <thijs@thijsschreijer.nl>
Date: Sun, 1 Dec 2013 10:21:53 +0100
Subject: If PowerShell is not available, a proper message is now displayed
 when installing on Windows without admin priviledges

---
 install.bat | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/install.bat b/install.bat
index 22f72e13..11558f7f 100644
--- a/install.bat
+++ b/install.bat
@@ -491,6 +491,10 @@ check_flags()
 if not permission() then
 	if not NOADMIN then
 		-- must elevate the process with admin priviledges
+        if not exec("PowerShell /? >NUL 2>&1") then
+          -- powershell is not available, so error out
+          die("No administrative priviledges detected and cannot auto-elevate. Please run with admin priviledges or use the /NOADMIN switch")
+        end
 		print("Need admin priviledges, now elevating a new process to continue installing...")
 		local runner = os.getenv("TEMP").."\\".."LuaRocks_Installer.bat"
 		local f = io.open(runner, "w")
-- 
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