Rewrite .git files to use a relative path in them

gistfile1.rb

#!/usr/bin/env ruby

require 'fileutils'
require 'pathname'

def ensure_relative_gitdir()
  %x{git ls-files --error-unmatch --stage}.split("\n").each do |line|
    value  = line.split(" ")
    if value[0] == "160000"
      FileUtils.cd(value[3]) do
        gitfile = ".git"
        if File.file?(gitfile) && open(gitfile).read.match(/^gitdir: (.*)$/) && Pathname.new($1).absolute?
          %x{git config --local core.worktree #{Pathname.new(FileUtils.pwd).relative_path_from(Pathname.new($1))}}
          open(gitfile, "w") do |file|
            file.puts("gitdir: #{Pathname.new($1).relative_path_from(Pathname.new(FileUtils.pwd))}")
          end
          ensure_relative_gitdir()
        end
      end
    end
  end
end

ensure_relative_gitdir()