Simple log printing/tailing/download for Capistrano V3.

gistfile1.rb

namespace :logs do

  desc "Download all log files from all hosts"
  task :fetch do
    on roles(:all) do
      capture(:ls, "#{shared_path}/log/").split(' ').each do |logfile|
        download! File.join(shared_path, 'log', logfile), File.join('.', 'tmp', "#{host}.#{logfile}")
      end 
    end 
  end 
  
  desc "Print full log files across all hosts"
  task :print do
    on roles(:all) do
      output = "==> #{host.to_s} <==\n"
      capture(:ls, "#{shared_path}/log/").split(' ').each do |logfile|
        output << "\n==> #{shared_path}/log/#{logfile} <==\n"
        output << capture(:cat, "#{shared_path}/log/*")
        output << "\n"
      end 
      puts output
    end 
  end 
  
  desc "Tail log files across all hosts (use NUM_LINES=100 to override number of printed lines)"
  task :tail do
    on roles(:all) do
      # could/should make this a task argument instead of an env var, I was just lazy.
      set :tail_num_lines, (ENV['NUM_LINES'] || 100)
      output = "==> #{host.to_s} <==\n\n"
      output << capture(:tail, "-n #{fetch :tail_num_lines}", "#{shared_path}/log/*")
      output << "\n"
      puts output
    end 
  end 

end