prepare_production.rb

#!/usr/bin/env ruby

projectroot = File.expand_path("../../", __FILE__)

Dir.chdir(projectroot)

puts <<-INFO
  This script pushes all changes in master to the production
  branch in addition to cleaning and precompiling assets.
  Press ENTER to continue, CTRL-C to exit:
INFO

begin
  gets
rescue Interrupt
  puts '>> Cancelled'
  exit
end

puts '>> Running...'

success = system <<-CMD
  git checkout production &&
  git pull origin master &&
  bundle exec rake assets:clean &&
  bundle exec rake assets:precompile &&
  git add . &&
  git commit -am "Precompiled Assets" &&
  git push origin production &&
  git checkout master
CMD

if success
  puts '>> Complete'
else
  puts '>> Error'
end

What happens if theres a conflict in lets say "git pull origin master". Process returns a code that's false so the rest does not execute?

Yup, the && prevents anything else from being executed