Update your hosts

update_hosts

#!/usr/bin/ruby


# Usage
# sudo ruby update_hosts.rb


require 'rubygems'
require 'fileutils'
require 'net/http'

LOCAL_HOSTS = "/etc/hosts"
HOSTS_URL = "https://smarthosts.googlecode.com/svn/trunk/hosts"
BEGINNING_IDENTIFIER = "# --- BEGIN HOSTS ---"

def backup
  now = Time.now.strftime "%y-%m-%d_%H:%M:%S"
  FileUtils.cp LOCAL_HOSTS, "#{LOCAL_HOSTS}.backup.#{now}"
end

def append_hosts
  File.open(LOCAL_HOSTS, 'a') do |f|
    content = %{#{BEGINNING_IDENTIFIER}\n#{get_hosts}\n}
    f.write content
  end
end

def remove_old_hosts_if_exists
  content = ""
  File.open LOCAL_HOSTS, 'r+' do |f|
    f.each_line do |line|
      break if line.match(/#{BEGINNING_IDENTIFIER}/)
      content += line
    end
  end

  File.open LOCAL_HOSTS, 'w' do |f|
    f.write content
  end
end

def get_hosts
  return Net::HTTP.get(URI.parse HOSTS_URL)
end

def main
  backup
  remove_old_hosts_if_exists
  append_hosts
end

main