From a88801cbf035866d9cdb25929cc19e811aa1b5b9 Mon Sep 17 00:00:00 2001
From: Teddysun <i@teddysun.com>
Date: Sun, 5 Jun 2016 20:17:44 +0900
Subject: [PATCH] Add warning information when install based on OpenVZ

---
 l2tp.sh | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/l2tp.sh b/l2tp.sh
index 2d1ed29..a5e8afa 100644
--- a/l2tp.sh
+++ b/l2tp.sh
@@ -199,6 +199,19 @@ version_check(){
 
 preinstall_l2tp(){
 
+    echo
+    if [ -d "/proc/vz" ]; then
+        echo -e "\033[41;37m WARNING: \033[0m Your VPS is based OpenVZ, Maybe the kernel does not support IPSec."
+        echo "Continue to install it? (y/n)"
+        read -p "(Default: n)" agree
+        [ -z ${agree} ] && agree="n"
+        if [ "${agree}" == "n" ]; then
+            echo
+            echo "L2TP install cancelled, nothing to do..."
+            echo
+            exit 0
+        fi
+    fi
     echo
     echo "Please input IP-Range:"
     read -p "(Default Range: 192.168.18):" iprange