Simple sudo under net/ssh

gistfile1.rb

#!/usr/local/bin/ruby19
require 'rubygems'
require 'net/ssh'
PASSWORD = '.....'

def shell
    Net::SSH.start('127.0.0.1','user',:password => PASSWORD) do |ssh|
        yield(SudoWrapper.new(ssh, PASSWORD))
    end
end

class SudoWrapper
    def initialize ssh, password
        @ssh = ssh
        @password = password
    end
    def exec! command
        @ssh.exec! "sudo -p 'SUDO_PASSWORD' #{command}" do |ch, stream, data|
            if data =~ /SUDO_PASSWORD/
                ch.send_data "#{@password}\n"
            else
                return data
            end
        end
    end
end

shell do |sh|
    puts sh.exec! 'whoami'
end

in `block in exec!': unexpected return (LocalJumpError)