jenkins-wargemmer/wargemmer

#!/usr/bin/env ruby

require 'bundler/setup'

require 'restclient'
require 'json'

print "latest jenkins version..."
jenkins_metadata = JSON.parse RestClient.get("http://updates.jenkins-ci.org/update-center.json").split("\n")[1..-2].join("\n")

puts current_jenkins_version = jenkins_metadata['core']['version']

print "latest gem version..."

gem_metadata = JSON.parse RestClient.get("http://rubygems.org/api/v1/gems/jenkins-war.json")

puts current_gem_version = gem_metadata['version']

if current_jenkins_version > current_gem_version
  puts "upgrading..."
  $stdout.flush
  exec "rake push[#{current_jenkins_version}]"
else
  puts "no need to upgrade. current gem is the latest"
end