Mina task that saves Unicorn and Sidekiq startup scripts to a file and adds its invocation to crontab on @reboot

mina_crontab.rb

namespace :maintenance do
  task :save_startup_script do
    script = "#!/bin/bash\n"
    crontab_task = "@reboot #{deploy_to}/shared/startup.sh > #{deploy_to}/shared/log/startup.log #minareboot"

    isolate do
      invoke 'unicorn:start'
      invoke 'sidekiq:start'
      script << commands.join(" && \\\n")
    end

    queue  %| echo "-----> Updating startup script" |
    queue! %| echo '#{script}' > #{deploy_to}/shared/startup.sh |
    queue! %| chmod +x #{deploy_to}/shared/startup.sh |

    queue  %| echo "-----> Ensuring @reboot cron task present" |
    queue! %| [[ $(crontab -l) != *minareboot* ]] && cat <(crontab -l) <(echo "#{crontab_task}") \| crontab - \|\| true |
  end
end