My First Ruby Class

gistfile1.rb

require 'chef/shef/ext'
require 'net/ssh'
require 'net/ssh/multi'
require 'readline'

module IchangeKnifePlugins

    PROJECT_HOME = "/home/ubuntu/ichange.com"
    SYMFONY_BIN = "#{PROJECT_HOME}/skylight/symfony"

    DEFAULT_ROLES_LIST = [ "loadbalancer", "webserver", "taskserver" ]

    class Deploy < Chef::Knife

        banner "knife deploy ENVIRONMENT" 

        option :identity,
               :short => '-i IDENTITY_FILE',
               :long => '--identity IDENTITY_FILE',
               :description => 'Path to SSH identity file'
        
        option :hotfix,
               :short => '-H CHANGE_REF',
               :long => '--hotfix CHANGE_REF',
               :description => 'Push an individual changeset as a hotfix, rather than a full update'

        def run 
            unless name_args.size == 1
                ui.fatal "You must specify an environment to deploy"
                show_usage
                exit 1
            end
            Shef::Extensions.extend_context_object(self)

            environment = name_args.first
            
            if config[:identity]
                @identity = config[:identity]
            end

            if config[:hotfix]
                @hotfix = config[:hotfix]
            end

            if environment == "production"
                @version = increment_version
            end
            
            DEFAULT_ROLES_LIST.each do |role|
                update(environment, role)
            end
        end

        def send_ssh(node, command)
            knife_ssh = Chef::Knife::Ssh.new
            if @identity
                knife_ssh.config[:identity_file] = @identity # e.g. "~/ichangekey.pem"
            end
            knife_ssh.config[:attribute] = "ec2.public_hostname"
            knife_ssh.config[:ssh_user] = "ubuntu"
            query = "name:#{node.name}"
            knife_ssh.name_args = [query, command]
            knife_ssh.run
        end

        def increment_version
            version_db_item = data_bag_item('configuration', 'version')
            version = version_db_item['version'].to_i
            version = version += 1
            version_db_item['version'] = version.to_s
            version_db_item.save
            return version
        end

        def update(environment, role)
            nodes.find("roles:#{role} AND chef_environment:#{environment}") do |ws|
                puts "Updating #{ws.name}"
                send_ssh(ws, "#{SYMFONY_BIN} project:disable frontend prod")
                send_ssh(ws, "sudo chef-client")
                if environment == "production"
                    send_ssh(ws, "git --git-dir=#{PROJECT_HOME} tag #{@version}")
                end
                send_ssh(ws, "#{SYMFONY_BIN} project:enable frontend prod")
            end
        end

        def hotfix(environment, role)
        end

    end
end

Haha, I just clicked on this from a google search I did. Looked up and saw it was yours.