Small improvements

openvpn-install.sh

@@ -5,6 +5,9 @@
 # Copyright (c) 2013 Nyr. Released under the MIT License.
 
 
+# Discard stdin. Needed when running from an one-liner which includes a newline
+read -N 999999999 -t 0.001
+
 # Detect Debian users running the script with "sh" instead of bash
 if readlink /proc/$$/exe | grep -q "dash"; then
 	echo "This script needs to be run with bash, not sh"
@@ -16,6 +19,12 @@ if [[ "$EUID" -ne 0 ]]; then
 	exit
 fi
 
+# Detect OpenVZ 6
+if [[ $(uname -r | cut -d "." -f 1) -eq 2 ]]; then
+	echo "The system is running an old kernel, which is incompatible with this installer"
+	exit
+fi
+
 # Detect OS
 # $os_version variables aren't always in use, but are kept here for convenience
 if grep -qs "ubuntu" /etc/os-release; then
@@ -63,6 +72,13 @@ TUN needs to be enabled before running this installer"
 	exit
 fi
 
+# Detect environments where $PATH does not include the sbin directories
+if ! grep -q sbin <<< $PATH; then
+	echo '$PATH does not include sbin
+Try using "su -" instead of "su"'
+	exit
+fi
+
 new_client () {
 	# Generates the custom client.ovpn
 	{