My post-receive hook.

github webhook receiver.rb

#!/usr/bin/env ruby1.8

require 'rubygems'
require 'sinatra'
require 'json'

base_repo_path = "/home/buildbot/repos"

post '/' do
  push = JSON.parse(params[:payload])
  branch = push['ref']
  old = push['before']
  new = push['after']
  repo = push['repository']['name']

  repo_path = "#{base_repo_path}/#{repo}.git"

  system("git --git-dir #{repo_path} remote update")
  cmd = "/home/buildbot/bin/git_buildbot.py -c #{repo} -l /tmp/bb.log"
  IO.popen("env GIT_DIR=#{repo_path} #{cmd}", "w") do |p|
    p.write "#{old} #{new} #{branch}\n"
  end
  "I got a push to: #{branch} from #{old} to #{new}"
end