rsync_remote_cache.rb

begin
  require 'capistrano/recipes/deploy/strategy/fast_remote_cache'
rescue LoadError
  require 'capistrano/recipes/deploy/strategy/remote_cache'
end

module Capistrano
  module Deploy
    module Strategy
      RsyncRemoteCache = Class.new(defined?(FastRemoteCache) ? FastRemoteCache : RemoteCache)
      
      class RsyncRemoteCache
        def deploy!
          logger.trace "deploying using #{'fast ' if FastRemoteCache === self}remote cache strategy"
          @only_primary = true
          super
          rsync_remote_cache
        end

        def check!
          super.check do |check|
            check.remote.command('rsync')
          end
        end

        protected :copy_repository_cache
        
          def copy_repository_cache
            rsync_remote_cache
            @only_primary = false
            super
          end
        
          def rsync_remote_cache
            logger.trace "rsyncing the cached version to #{repository_cache} on all servers"

            primary_host = rsync_host(find_servers(:only => { :primary => true }).first)
            run_options  = { :except => { :no_release => true, :primary => true } }
            cmd = []
            cmd << "ssh -o StrictHostKeyChecking=no #{primary_host} date"
            cmd << "rsync -a --delete #{primary_host}:#{repository_cache}/ #{repository_cache}/"
            run(cmd.join(' && '), run_options)
          end

          def run(cmd, options = {}, &block)
            options[:only] = { :primary => true } if @only_primary && !options[:except]
            super(cmd, options, &block)
          end
          
          def rsync_host(server)
            configuration[:user] ? "#{configuration[:user]}@#{server.host}" : server.host
          end
      end
    end
  end
end