[Capistrano] [ann]how to use many step gateways.

[[EMAIL PROTECTED]]

In my networks, I need to login to a gateway server through two other
servers.

[my pc] -- [hostA] -- [hostB] -- [gateway] -- [target servers]

so, I extend gateway.rb and make gateways.rb
the way to use,

gateway = Capistrano::Gateways.new(["hostA", "hostB", "gateway"],
config).gateway

you can reffer to the article below, too.
http://weblog.jamisbuck.org/2006/9/26/inside-capistrano-the-gateway-implementation.

## gateways.rb
require 'capistrano/gateway'

module Capistrano
  class Gateways
    MAX_PORT = 65535
    MIN_PORT = 1024
    def initialize(servers, options={})
      @gateways = []
      @next_port = MAX_PORT
      @port_guard = Mutex.new
      servers.to_a.flatten!
      first, others = servers.first, servers[1..-1]
      @gateways << Capistrano::Gateway.new(first, options)
      others.to_a.flatten.each do |server|
        local_port = next_port
        @gateways.last.session.forward.local(local_port, server, 22)
        addr = "127.0.0.1:#{local_port}"
        @gateways << Capistrano::Gateway.new(addr, options)
      end
    end

    def gateway
      @gateways.last
    end

    private

      def next_port
        @port_guard.synchronize do
          port = @next_port
          @next_port -= 1
          @next_port = MAX_PORT if @next_port < MIN_PORT
          port
        end
      end
  end
end


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