/usr/lib/ruby/1.9.1/diakonos/hooks.rb is in diakonos 0.9.0-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 | module Diakonos
  class Diakonos
    def register_proc( the_proc, hook_name, priority = 0 )
      @hooks[ hook_name ] << { :proc => the_proc, :priority => priority }
    end
    def run_hook_procs( hook_id, *args )
      @hooks[ hook_id ].each do |hook_proc|
        hook_proc[ :proc ].call( *args )
      end
    end
  end
end
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