git bigfile finder from http://stackoverflow.com/questions/298314/find-files-in-git-repo-over-x-megabytes-that-dont-exist-in-head

bigfile.rb

#!/usr/bin/env ruby -w
head, treshold = ARGV
head ||= 'HEAD'
Megabyte = 1000 ** 2
treshold = (treshold || 0.1).to_f * Megabyte

big_files = {}

IO.popen("git rev-list #{head}", 'r') do |rev_list|
  rev_list.each_line do |commit|
      commit.chomp!
          for object in `git ls-tree -zrl #{commit}`.split("\0")
              bits, type, sha, size, path = object.split(/\s+/, 5)
              size = size.to_i
              big_files[sha] = [path, size, commit] if size >= treshold
           end
       end
  end

big_files.each do |sha, (path, size, commit)|
  where = `git show -s #{commit} --format='%h: %cr'`.chomp
  puts "%4.1fM\t%s\t(%s)" % [size.to_f / Megabyte, path, where]
end