A couple of rake tasks to handle Go projects deployment

go.rake

namespace :go do
  task :upload do
    on release_roles :all do
      upload! "#{repo_path}/#{fetch(:application)}", release_path
    end
  end

  task :build do
    run_locally do
      within repo_path do
        with fetch(:go_build_env) do
          execute :go, :build, :'-v'
        end
      end
    end
  end

  task :run do
    on release_roles :all do
      with fetch(:go_run_env) do
        within release_path do
          if test "[ -f pid/#{fetch(:application)}.pid ]"
            execute :kill, "`cat pid/#{fetch(:application)}.pid`"
          end
          execute :nohup, "./#{fetch(:application)}", "#{fetch(:go_run_args, '')} 2>&1 > #{shared_path}/log/#{fetch(:application)}.log & (echo $! > #{shared_path}/pid/#{fetch(:application)}.pid)"
        end
      end
    end
  end
end

after 'deploy:updating', 'go:build'
after 'go:build', 'go:upload'
after 'deploy:finished', 'go:run'