Rails, VLAD, RVM, SUDO

README.txt

For a working sudo in a non-interactive ssh session:
1. Copy askpass to $HOME/bin/askpass & make it executeable (chmod +x $HOME/bin/askpass)
2. Change your deploy.rb to setup the SUDO_ASKPASS environment variable (see man sudo)

Credits: http://serverfault.com/questions/307366/error-deploying-app-with-vlad-running-a-sudo-command-to-ubuntu-server

askpass

#!/usr/bin/env ruby
puts gets.chomp!

deploy.rb

# http://upstart.ubuntu.com/
# http://ddollar.github.com/foreman/

namespaace :myapp
  task :init do
    set :domain,    'user@domain'
    set :revision,  'master'
    set :deploy_to, '/var/www/myapp/rails'

    set :rvm_init,  'source /usr/local/rvm/scripts/rvm && rvm use ruby-1.9.3'

    set :sudo_flags,   sudo_flags << '-S'
    set :run_as_sudo,  [sudo_cmd, sudo_flags].flatten.compact.join(' ')
    set :askpass_init, 'export SUDO_ASKPASS=$HOME/bin/askpass'
  end

  remote_task :deploy => [:init, "vlad:update"] do
    run [
      "cd #{current_release} && #{rvm_init}",
      "bundle install --path vendor/bundle",
      "bundle exec rake assets:precompile",
      "#{askpass_init} && #{run_as_sudo} restart myapp"
    ].join(" && ")
  end
end