git-add-github-forks

#!/usr/bin/env ruby
require 'rubygems'
require 'open-uri'
require 'json'

# Clone a github repo, add all forks as remotes:
# $ git clone https://github.com/rails/rails.git
# $ cd rails
# $ git add-github-forks

origin_url = `git config remote.origin.url`.chomp
source = origin_url.scan(%r{github\.com/([^/]+/[^/]+).git\z}).to_s
raise "Unsupported url #{origin_url}" unless source.length>0

network = JSON.parse(open("http://github.com/api/v2/json/repos/show/#{source}/network").read)

network['network'].each do |fork|
  url = fork['url'] + '.git'
  owner = fork['owner']
  `git remote add #{owner} #{url}; git fetch #{owner}`
end