Simple 'start-stop-daemon'-based script to start/stop/restart kemal after deployment with capistrano

kemalcr_task.rake

namespace :deploy do

  desc 'show kemal status'
  task :kemal_status do
    on roles(:app) do
      within "#{release_path}" do
        execute "start-stop-daemon",
          "-v",
          "--status",
          "--pid",
          "`cat #{shared_path}/tmp/pids/kemal.pid`"
      end
    end
  end

  desc 'stop kemal'
  task :kemal_stop do
    on roles(:app) do
      within "#{release_path}" do
        execute "start-stop-daemon",
          "-v",
          "--stop",
          "--pid",
          "`cat #{shared_path}/tmp/pids/kemal.pid`"
      end
    end
  end

  desc 'start_kemal'
  task :kemal_start do
    on roles(:app) do
      within "#{release_path}" do
        execute "start-stop-daemon",
          "-v",
          "--start",
          "--make-pidfile",
          "--background",
          "--pidfile",
          "#{shared_path}/tmp/pids/kemal.pid",
          "--exec",
          "#{current_path}/app",
          "--",
          "-p3030"
      end
    end
  end

  desc 'restart_kemal'
  task :kemal_restart do
    invoke 'deploy:kemal_stop'
    invoke 'deploy:kemal_start'
  end
end