Add the logger and related configuration options.

lib/gitlab_config.rb

@@ -31,6 +31,14 @@ class GitlabConfig
     redis['namespace'] || 'resque:gitlab'
   end
 
+  def log_file
+    @config['log_file'] ||= File.join(ROOT_PATH, 'log', 'gitlab_shell.log')
+  end
+
+  def log_level
+    @config['log_level'] ||= 'INFO'
+  end
+
   # Build redis command to write update event in gitlab queue
   def redis_command
     if redis.empty?

lib/gitlab_logger.rb

+require 'logger'
+
+require_relative 'gitlab_config'
+
+def convert_log_level log_level
+  Logger.const_get(log_level.upcase)
+rescue NameError
+  $stderr.puts "WARNING: Unrecognized log level #{log_level.inspect}."
+  $stderr.puts "WARNING: Falling back to INFO."
+  Logger::INFO
+end
+
+config = GitlabConfig.new
+
+$logger = Logger.new(config.log_file)
+$logger.level = convert_log_level(config.log_level)