convert.rb

#!/usr/bin/env ruby
# -*- ruby -*-

`git checkout opscode/master`
Dir.glob("*").select {|x| FileTest.directory?(x) }.each do |path|
  `git br -D #{path}`
  `git checkout -b #{path} opscode/master`
  `git filter-branch --tree-filter \
    'rm -rf #{Dir.glob("*").reject {|x| x == path }.join(" ")}' --prune-empty HEAD`
  `rm -rf .git/refs/original`
  `git reset --hard HEAD`
  `git checkout opscode/master`
end
`git checkout master`
`git gc --aggressive`
`git prune`