deploy.rb

namespace :log do
  desc "Downloads application logs to ./log/deploy/<RAILS_ENV>/<TIMESTAMP>/"
  task :fetch, :roles => :app do
      source = "#{shared_path}/log/#{rails_env}.log*"
      files_per_host = {}
      run "ls #{source}" do |channel, stream, data|
        files_per_host[channel[:host]] = data.split("\n")
      end

      destination = File.join('log', 'deploy')
      target_dir = File.join(destination, rails_env, Time.now.strftime("%Y%m%d_%H%M"))
      FileUtils.mkdir_p(target_dir)
      files_per_host.each do |host, files|
        files.each do |file|
          file_name = file.split("/").last
          download file, "#{target_dir}/$CAPISTRANO:HOST$-#{file_name}", :via => :scp, :hosts => host
        end
      end
  end
end