namespace :deploy do

desc "checks whether the currently checkout out revision matches the
      remote one we're trying to deploy from"
task :check_revision do
  branch = fetch(:branch)
  unless `git rev-parse HEAD` == `git rev-parse origin/#{branch}`
    puts "WARNING: HEAD is not the same as origin/#{branch}"
    puts "Run `git push` to sync changes or make sure you've"
    puts "checked out the branch: #{branch} as you can only deploy"
    puts "if you've got the target branch checked out"
    exit
  end
end

end