Fixed root check and targeted POSIX shell instead of Bash.

README.md

@@ -16,5 +16,5 @@ anonymous.
     service.
 
 ## Usage
-Just run `openvpn-rotate` and it will link a random configuration to the path that
+Just run `openvpn-rotate` and it will link a random different configuration to the path that
 `openvpn.service` reads. It does not currently accept any arguments.

openvpn-rotate

@@ -1,13 +1,11 @@
-#!/usr/bin/env bash
+#!/bin/sh
 
 ovpn_directory="/etc/openvpn/client/ovpn-enabled"
 current_ovpn_path="/etc/openvpn/client/current.ovpn"
 
-# TODO: Investigate better ways to check for rootness. This is just a courtesy message, though.
-#   Non-root users will not be able to do anything with this anyway.
-if [ "$(whoami)" != "root" ]; then
+if [ "$(id -u)" -ne 0 ]; then
     echo "This script needs root privileges to interact with the openvpn service."
-    exit
+    exit 1
 fi
 
 prior_ovpn_path="$(readlink "${current_ovpn_path}")"