添加注释

config/initializers/logger.rb

@@ -195,6 +195,7 @@ require 'fileutils'
 #   # e.g. "Thu Sep 22 08:51:08 GMT+9:00 2005: hello world"
 #
 class Logger
+  #具体内容请看https://bugs.ruby-lang.org/issues/7303
   # Device used for logging messages.
   class LogDevice
     def shift_log_period(period_end)
@@ -213,11 +214,12 @@ class Logger
       # @dev.close rescue nil
       # File.rename("#{@filename}", age_file)
       # @dev = create_logfile(@filename)
+      #覆盖原来lib库的方法，将上边三行删除，增加下边两行
       FileUtils.cp(@filename, age_file)
       reset_logfile(@dev) # see below for this new method return true
       return true
     end
-
+    #打开原来lib库，新增一个方法
     def reset_logfile(logdev)
       logdev.truncate( 0 )
       logdev.sync = true