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[:xserver]] = data.split("\n").map(&:split)
    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}/#{file_name}", :via => :scp
      end
    end
  end
end