Optimize and Shrink your GIT Repository (Ruby Script). From Jeff Smith @ rallydev.com.

shrink-git-repo.rb

#!/usr/bin/env ruby
# Original Scripting by Jeff Smith at http://rallydev.com/, https://www.rallydev.com/community/engineering/shrinking-git-repository-move-githubcom.
 
module ShrinkIt
  BUCKETS = 4
 
  def self.remove(files)
    files.each_slice(files.size / BUCKETS) do |portion|
      paths = portion.join(" ")
      ShrinkIt.stream_command("git filter-branch --index-filter 'git rm --cached --ignore-unmatch #{paths}'")
      ShrinkIt.stream_command("rm -rf .git/refs/original/")
      ShrinkIt.stream_command("git reflog expire --expire=now --all")
      ShrinkIt.stream_command("git fsck --full --unreachable")
      ShrinkIt.stream_command("git repack -A -d")
      ShrinkIt.stream_command("git gc --aggressive --prune=now")
    end
  end
 
  def self.stream_command(cmd)
    puts "#{Time.new} Starting #{cmd}"
    IO.popen(cmd) do |data|
      while line = data.gets
        puts line
      end
    end
  end
end
 
large_files = []
large_files << "largefile1.jar"
large_files << "HugeDirectory/*"
large_files << "ThirdParty/*"
large_files << "Stuff/*"
large_files << "sub-project/*"
large_files << "zipNotNeededAnymore.zip"
 
ShrinkIt.remove(large_files)