Upgrade chef

upgrade.rb

config(:chef, node_name: 'foo', client_key: '/path/to/client.pem', chef_server_url: 'https://foo.bar.com')
config(:ssh, user: 'foo', password: 'bar')
[
  'sudo apt-get remove chef --purge -y',
  'sudo rm -rf /opt/chef',
  'sudo rm -rf /etc/chef/client.d',
  'wget -c https://opscode-omnibus-packages.s3.amazonaws.com/ubuntu/13.04/x86_64/chef-xxx.deb',
  'sudo dpkg -i chef-xxx.deb',
  'sudo env -i /opt/chef/bin/chef-client',
  'rm chef-xxx.deb'
].each do |cmd|
  ssh_task cmd
end