#!/usr/bin/env ruby
require 'socket'

if ARGV.length < 2
  puts 'is_master execute a command when it determine that server is master'
  puts "Usage: #{$PROGRAM_NAME} VIP COMMAND"
  puts '  VIP - IP address expected to be master'
  puts '  COMMAND - Command to execute if host is master'
  exit 2
end

vip = ARGV[0]
command = ARGV[1..-1].join(' ')

if Socket.ip_address_list.map(&:ip_address).include?(vip)
  Kernel.exec(command)
else
  puts 'OK - I am slave, i going to sleep'
end