Merge branch 'mitchellh/process_stderr'

Conflicts:
	lib/net/ssh/shell/process.rb

Author: jamis

lib/net/ssh/shell/process.rb

@@ -14,6 +14,7 @@ def initialize(manager, command, callback)
       @callback = callback
       @properties = {}
       @on_output = Proc.new { |p, data| print(data) }
+      @on_error_output = Proc.new { |p, data| print(data) }
       @on_finish = nil
       @state = :new
     end
@@ -36,6 +37,7 @@ def run
         manager.open do
           state = :running
           manager.channel.on_data(&method(:on_stdout))
+          manager.channel.on_extended_data(&method(:on_stderr))
           manager.channel.on_close(&method(:on_close))
 
           cmd = command.dup
@@ -75,6 +77,10 @@ def on_output(&callback)
       @on_output = callback
     end
 
+    def on_error_output(&callback)
+      @on_error_output = callback
+    end
+
     def on_finish(&callback)
       @on_finish = callback
     end
@@ -96,6 +102,11 @@ def on_stdout(ch, data)
         end
       end
 
+      def on_stderr(ch, type, data)
+        return unless @on_error_output
+        @on_error_output.call(self, data)
+      end
+
       def on_close(ch)
         manager.on_channel_close(ch)
         finished!(-1)