From 98446561cf3c7126dd93b34c9be361fa4aa8da36 Mon Sep 17 00:00:00 2001
From: Giuseppe Bilotta <giuseppe.bilotta@gmail.com>
Date: Sat, 29 May 2021 18:47:29 +0200
Subject: [PATCH] fix: restart logger thread after fork

Logging was broken when daemonizing, due to the logger thread being dead
after the fork. This can be solved by restarting the thread, if necessary
when setting the log file (which we conveniently do right after the fork).
---
 bin/rbot           | 14 +++++++-------
 lib/rbot/ircbot.rb |  9 +++++++--
 lib/rbot/logger.rb | 14 ++++++++++++--
 3 files changed, 26 insertions(+), 11 deletions(-)

diff --git a/bin/rbot b/bin/rbot
index 82ee9c9a..8c65f42c 100755
--- a/bin/rbot
+++ b/bin/rbot
@@ -111,14 +111,14 @@ if ($opts["help"])
   exit 0
 end
 
-if(bot = Irc::Bot.new(ARGV.shift, :argv => orig_opts))
-  # setup logger based on command line arguments
-  loglevel = $opts['loglevel'] ? $opts['loglevel'].to_i : nil
-  loglevel = $opts['debug'] ? 0 : loglevel
-  if loglevel
-    Irc::Bot::LoggerManager.instance.set_level(loglevel)
-  end
+# setup logger based on command line arguments
+loglevel = $opts['loglevel'] ? $opts['loglevel'].to_i : nil
+loglevel = $opts['debug'] ? 0 : loglevel
+if loglevel
+  Irc::Bot::LoggerManager.instance.set_level(loglevel)
+end
 
+if(bot = Irc::Bot.new(ARGV.shift, :argv => orig_opts))
   # just run the bot
   bot.mainloop
 end
diff --git a/lib/rbot/ircbot.rb b/lib/rbot/ircbot.rb
index ecb48449..4eac68d6 100644
--- a/lib/rbot/ircbot.rb
+++ b/lib/rbot/ircbot.rb
@@ -403,6 +403,8 @@ class Bot
       debug "Using `#{@logfile}' as debug log"
     end
 
+    LoggerManager.instance.flush
+
     # See http://blog.humlab.umu.se/samuel/archives/000107.html
     # for the backgrounding code
     if $daemonize
@@ -421,8 +423,11 @@ class Bot
       # File.umask 0000                # Ensure sensible umask. Adjust as needed.
     end
 
-    # setup logger based on bot configuration
-    LoggerManager.instance.set_level(@config['log.level'])
+    # setup logger based on bot configuration, if not set from the command line
+    loglevel_set = $opts.has_key?('debug') or $opts.has_key?('loglevel')
+    LoggerManager.instance.set_level(@config['log.level']) unless loglevel_set
+
+    # Set the logfile
     LoggerManager.instance.set_logfile(@logfile, @config['log.keep'], @config['log.max_size'])
 
     if $daemonize
diff --git a/lib/rbot/logger.rb b/lib/rbot/logger.rb
index b5f615d7..fd6d485f 100644
--- a/lib/rbot/logger.rb
+++ b/lib/rbot/logger.rb
@@ -23,13 +23,16 @@ class Bot
       @file_logger = nil
 
       @queue = Queue.new
-      @thread = start_thread
+      start_thread
     end
 
     def set_logfile(filename, keep, max_size)
       @file_logger = Logger.new(filename, keep, max_size*1024*1024)
       @file_logger.datetime_format = @dateformat
       @file_logger.level = @logger.level
+      # make sure the thread is running, which might be false after a fork
+      # (conveniently, we call set_logfile right after the fork)
+      start_thread
     end
 
     def set_level(level)
@@ -90,10 +93,17 @@ class Bot
       end
     end
 
+    def flush
+      while @queue.size > 0
+        next
+      end
+    end
+
     private
 
     def start_thread
-      Thread.new do
+      return if @thread and @thread.alive?
+      @thread = Thread.new do
         lines = nil
         while lines = @queue.pop
           lines.each { |line|
-- 
2.39.2