= checksummer
checksummer replaces all files in a given directory with symlinks to files named and hashed by MD5 checksum of each file.

= Usage

  checksummer <directory_to_checksum> <directory_to_write_data> [OPTIONS]
  
  Options:
    --sleep TIME     Sleep for TIME milliseconds after each symlink operation (for fair IO)

= Example

  checksummer /music /data

== Jay-Z - The Blueprint 3
 source                                                                                                destination
 /music/jay-z/the_blueprint_3/01-what_we_talkin_about.mp3                                        =>    /data/3/6/a/5/36a5642b1613bf5589cb479332bddca6
 /music/jay-z/the_blueprint_3/02-thank_you.mp3                                                   =>    /data/5/1/e/8/51e896f5544b9372edbdf7ec853892a1
 /music/jay-z/the_blueprint_3/03-doa.mp3                                                         =>    /data/1/e/7/a/1e7aa593020b60e6b45d0178e49d0413 (duplicate)
 /music/jay-z/the_blueprint_3/04-run_this_town.mp3                                               =>    /data/1/f/4/5/1f454817ee460e28ede71b5e5ee902bd (duplicate)
 /music/jay-z/the_blueprint_3/05-empire_state_of_mind.mp3                                        =>    /data/4/9/d/3/49d39143e0c42e4c2b852f604938c0d0 (duplicate)
 /music/jay-z/the_blueprint_3/06-real_as_it_gets.mp3                                             =>    /data/9/8/8/d/988d10054f0eceb5def18bbb2c453557
 /music/jay-z/the_blueprint_3/07-on_to_the_next_one.mp3                                          =>    /data/e/f/8/0/ef80c8b3560b5e1c15c919f354d226f8
 /music/jay-z/the_blueprint_3/08-off_that.mp3                                                    =>    /data/3/6/a/8/36a8152e0d98ccd6a375a8ab489cd4a1
 /music/jay-z/the_blueprint_3/09-a_star_is_born.mp3                                              =>    /data/4/f/0/f/4f0f8253196a98fb54bed89a3768fb8b
 /music/jay-z/the_blueprint_3/10-venus_vs_mars.mp3                                               =>    /data/3/6/1/c/361cba2aaa0d42bc376187a49448fa45
 /music/jay-z/the_blueprint_3/11-already_home.mp3                                                =>    /data/d/4/a/7/d4a7756791dbd6df6514c84262b9bb18
 /music/jay-z/the_blueprint_3/12-hate.mp3                                                        =>    /data/4/a/6/d/4a6d2a9d04778ead9b04d7f45be1e6bd
 /music/jay-z/the_blueprint_3/13-reminder.mp3                                                    =>    /data/c/e/7/4/ce74f6184af8acc3af232df9b9335a76
 /music/jay-z/the_blueprint_3/14-so_ambitious.mp3                                                =>    /data/0/d/6/1/0d6140d1a1c681b1f9f5eba7dee523e9
 /music/jay-z/the_blueprint_3/15-young_forever.mp3                                               =>    /data/f/0/2/1/f0212f638eea55b9d5815515d40e9787
                                                                                                       
== Jay-Z - The Hits Collection Volume One                                                              
  source                                                                                                destination
 /music/jay-z/the_hits_collection_volume_one/01-public_service_announcement_(interlude).mp3      =>    /data/a/c/1/a/ac1a8c0df8971e732f034a2c6efa6fc1
 /music/jay-z/the_hits_collection_volume_one/02-run_this_town.mp3                                =>    /data/1/f/4/5/1f454817ee460e28ede71b5e5ee902bd (duplicate)
 /music/jay-z/the_hits_collection_volume_one/03-03_bonnie_&_clyde.mp3                            =>    /data/d/9/6/5/d9659ed413e0be456c35521639953724
 /music/jay-z/the_hits_collection_volume_one/04-encore.mp3                                       =>    /data/c/7/c/e/c7ce40508cb1cacf56cbd671bd1adfb8
 /music/jay-z/the_hits_collection_volume_one/05-i_just_wanna_love_u_(give_it_2_me).mp3           =>    /data/e/1/9/f/e19fa1483b208e75792b30d8562aaed0
 /music/jay-z/the_hits_collection_volume_one/06-izzo_(hova).mp3                                  =>    /data/1/a/a/a/1aaabf78c9d8e30745b3fc8b2e87e285
 /music/jay-z/the_hits_collection_volume_one/07-doa_(death_of_auto-tune).mp3                     =>    /data/1/e/7/a/1e7aa593020b60e6b45d0178e49d0413 (duplicate)
 /music/jay-z/the_hits_collection_volume_one/08-99_problems.mp3                                  =>    /data/7/6/b/6/76b689ae2f65bc44340a4bc2831cd559
 /music/jay-z/the_hits_collection_volume_one/09-empire_state_of_mind.mp3                         =>    /data/4/9/d/3/49d39143e0c42e4c2b852f604938c0d0 (duplicate)
 /music/jay-z/the_hits_collection_volume_one/10-dirt_off_your_shoulder.mp3                       =>    /data/3/2/c/5/32c5218d1a460a6257ab6b7aad23add9
 /music/jay-z/the_hits_collection_volume_one/11-hard_knock_life_(ghetto_anthem).mp3              =>    /data/3/5/9/9/3599648c6dfba16787a0f27b2593c624
 /music/jay-z/the_hits_collection_volume_one/12-show_me_what_you_got.mp3                         =>    /data/1/a/3/8/1a38f265b1e40d5fc7e1c1814eecc887
 /music/jay-z/the_hits_collection_volume_one/13-roc_boys_(and_the_winner_is).mp3                 =>    /data/f/8/7/5/f875b6de8e2f7fd5366a209a1ec225c2
 /music/jay-z/the_hits_collection_volume_one/14-big_pimpin.mp3                                   =>    /data/e/9/e/b/e9ebaa49726d7ac990c4eb57fc8eee59

= Advantages

* Save space: dulicate files are replaced with symlinks to one file
* Partition data uniformly on multiple disks:
  /data/[0-8] could be symlinked to e.g. /dev/disk1
  /data/[9-f] could be symlinked to e.g. /dev/disk2

== Contributing to checksummer
 
* Check out the latest master to make sure the feature hasn't been implemented or the bug hasn't been fixed yet
* Check out the issue tracker to make sure someone already hasn't requested it and/or contributed it
* Fork the project
* Start a feature/bugfix branch
* Commit and push until you are happy with your contribution
* Make sure to add tests for it. This is important so I don't break it in a future version unintentionally.
* Please try not to mess with the Rakefile, version, or history. If you want to have your own version, or is otherwise necessary, that is fine, but please isolate to its own commit so I can cherry-pick around it.

== Copyright

Copyright (c) 2011 Tobias Schwab. See LICENSE.txt for
further details.