github-classroom-clona.rb

#!/usr/bin/env ruby

require 'github_api'

def die(msg)
  STDERR.puts msg
  STDERR.puts
  exit 1
end

organization = ENV['ORG'] || die("Please specify the GitHub organization using the environment variable 'ORG'.")
github_token = ENV['GITHUB_TOKEN'] || die("Please specify your GitHub token using the environment variable 'GITHUB_TOKEN'. See https://github.com/settings/tokens")
repo_prefix = ENV['REPO_PREFIX'] || ""

exists = Dir.glob('*')

github = Github.new basic_auth: github_token

pagenum = 1
list = []
while page = github.repos.list(org: organization, page: pagenum, per_page: 100)
  break if page.size < 1
  list += page.to_a
  pagenum += 1
end

list.select! { |repo| repo["clone_url"].split("/")[-1].start_with?(repo_prefix) }

dup = list.select{|repo| exists.include?(repo["name"]) }
puts "skipping #{dup.size} repositories which already exists.\n"

list = list.select{|repo| !exists.include?(repo["name"]) }
puts "cloning #{list.size} repositories.\n"

list.each do |repo|
  system "git clone #{repo["clone_url"]}"
  sleep 2
end