Makes Capistrano respect dry_run in file transfers

If cap is called with -n capistrano now doesn't transfer any files to
and from the server, but logs the action instead.

lib/capistrano/configuration/actions/file_transfer.rb

@@ -37,7 +37,11 @@ module Capistrano
         def transfer(direction, from, to, options={}, &block)
           execute_on_servers(options) do |servers|
             targets = servers.map { |s| sessions[s] }
-            Transfer.process(direction, from, to, targets, options.merge(:logger => logger), &block)
+            if dry_run
+              logger.debug "transfering: #{[direction, from, to, targets, options.merge(:logger => logger).inspect ] * ', '}"
+            else
+              Transfer.process(direction, from, to, targets, options.merge(:logger => logger), &block)
+            end
           end
         end
 

test/configuration/actions/file_transfer_test.rb

@@ -4,7 +4,7 @@ require 'capistrano/configuration/actions/file_transfer'
 class ConfigurationActionsFileTransferTest < Test::Unit::TestCase
   class MockConfig
     include Capistrano::Configuration::Actions::FileTransfer
-    attr_accessor :sessions
+    attr_accessor :sessions, :dry_run
   end
 
   def setup

test/configuration/actions/invocation_test.rb

@@ -1,5 +1,6 @@
 require "utils"
 require 'capistrano/configuration/actions/invocation'
+require 'capistrano/configuration/actions/file_transfer'
 
 class ConfigurationActionsInvocationTest < Test::Unit::TestCase
   class MockConfig
@@ -7,9 +8,11 @@ class ConfigurationActionsInvocationTest < Test::Unit::TestCase
     attr_accessor :debug
     attr_accessor :dry_run
 		attr_accessor :preserve_roles
+    attr_accessor :servers
 
     def initialize
       @options = {}
+      @servers = []
     end
 
     def [](*args)
@@ -24,13 +27,17 @@ class ConfigurationActionsInvocationTest < Test::Unit::TestCase
       @options.fetch(*args)
     end
 
+    def execute_on_servers(options = {})
+      yield @servers
+    end
+
     include Capistrano::Configuration::Actions::Invocation
+    include Capistrano::Configuration::Actions::FileTransfer
   end
 
   def setup
-    @config = MockConfig.new
+    @config = make_config
     @original_io_proc = MockConfig.default_io_proc
-    @config.stubs(:logger).returns(stub_everything)
   end
 
   def teardown
@@ -48,6 +55,15 @@ class ConfigurationActionsInvocationTest < Test::Unit::TestCase
     @config.run "ls", :foo => "bar"
   end
 
+  def test_put_wont_transfer_if_dry_run
+    config = make_config
+    config.dry_run = true
+    config.servers = %w[ foo ]
+    config.expects(:sessions).returns({ 'foo-server' => 'bar' })
+    ::Capistrano::Transfer.expects(:process).never
+    config.put "foo", "bar", :mode => 0644
+  end
+
   def test_add_default_command_options_should_return_bare_options_if_there_is_no_env_or_shell_specified
     assert_equal({:foo => "bar"}, @config.add_default_command_options(:foo => "bar"))
   end
@@ -203,6 +219,12 @@ class ConfigurationActionsInvocationTest < Test::Unit::TestCase
 
   private
 
+    def make_config
+      config = MockConfig.new
+      config.stubs(:logger).returns(stub_everything)
+      config
+    end
+
     def inspectable_proc
       Proc.new do |ch, stream, data|
         ch.called