Make send_file aware of user option

lib/itamae/backend.rb

@@ -98,15 +98,20 @@ def receive_file(src, dst = nil)
         @backend.receive_file(src, dst)
       end
 
-      def send_file(src, dst)
+      def send_file(src, dst, user: nil)
         Itamae.logger.debug "Sending a file from '#{src}' to '#{dst}'..."
         unless ::File.exist?(src)
           raise SourceNotExistError, "The file '#{src}' doesn't exist."
         end
         unless ::File.file?(src)
           raise SourceNotExistError, "'#{src}' is not a file."
         end
-        @backend.send_file(src, dst)
+
+        if self.instance_of?(Backend::Local)
+          run_command(get_command(:copy_file, src, dst), user: user)
+        else
+          @backend.send_file(src, dst)
+        end
       end
 
       def send_directory(src, dst)

lib/itamae/resource/file.rb

@@ -183,12 +183,12 @@ def send_tempfile
 
           if backend.is_a?(Itamae::Backend::Docker)
             run_command(["mkdir", @temppath])
-            backend.send_file(src, @temppath)
+            backend.send_file(src, @temppath, user: attributes.user)
             @temppath = ::File.join(@temppath, ::File.basename(src))
           else
             run_command(["touch", @temppath])
             run_specinfra(:change_file_mode, @temppath, '0600')
-            backend.send_file(src, @temppath)
+            backend.send_file(src, @temppath, user: attributes.user)
           end
 
           run_specinfra(:change_file_mode, @temppath, '0600')