Github backup script

backup_git_repos.sh

#!/usr/bin/env ruby

require 'rubygems'
require 'json'
require 'fileutils'
require 'net/smtp'
require 'net/https'
require 'uri'

BACKUP_DIR='/srv/git/repositories'
USERNAME='threez'
URL_REPOS="https://api.github.com/users/#{USERNAME}/repos"
URL_CLONE="[email protected]:#{USERNAME}"

def update(repo_path)
  puts "## update repo #{repo_path}"
  Dir.chdir repo_path
  `git remote update`
end

def clone(repo_url)
  Dir.chdir BACKUP_DIR
  puts "## fetch repo #{repo_url}"
  `git clone --bare #{repo_url}`
end

def send_email(to,opts={})
  opts[:server]      ||= 'localhost'
  opts[:from]        ||= '[email protected]'
  opts[:from_alias]  ||= 'Github Backup Script'
  opts[:subject]     ||= "Github Backup failed"
  opts[:body]        ||= "Important stuff!"

  msg = <<END_OF_MESSAGE
From: #{opts[:from_alias]} <#{opts[:from]}>
To: <#{to}>
Subject: #{opts[:subject]}

#{opts[:body]}
END_OF_MESSAGE

  Net::SMTP.start(opts[:server]) do |smtp|
    smtp.send_message msg, opts[:from], to
  end
end

puts "## BEGIN github backup: #{Time.now.to_s}"

begin
  uri = URI.parse(URL_REPOS)
 
  http = Net::HTTP.new(uri.host, uri.port)
  http.use_ssl = true
  http.verify_mode = OpenSSL::SSL::VERIFY_PEER
  # it's from curl from http://curl.haxx.se/ca/cacert.pem
  http.ca_file = "/etc/cacert.pem"

  headers = { "Accept" => "application/vnd.github.v3+json" }
  repo_json = http.get(uri.path, headers).body
  
  JSON.load(repo_json).each do |repo|
    repo_name = "#{repo["name"]}.git"
    repo_url = repo["git_url"]
    repo_path = "#{BACKUP_DIR}/#{repo_name}"

    if not File.directory? BACKUP_DIR
      FileUtils.mkdir_p BACKUP_DIR
    end

    if File.directory? repo_path
      update repo_path
    else
      clone repo_url
    end
  end
rescue Exception => e
  puts e
  send_email("[email protected]", :body => e.message)
end

puts "## END github backup: #{Time.now.to_s}"

crontab

0 */1 * * * git /home/git/helper-scripts/backup_git_repos.rb >>/home/git/github-backup/backup.log 2>&1