Git post-receive hook that broadcasts commit messages via jabber

post-receive.rb

# post-receive
# 
# Broadcast commit messages when pushed to the repositories master branch.
#
#== Git Configuration Example
# [notify]
#     jabber = foo bar
#
require 'rubygems'
require 'jabber4r/jabber4r'

user_suffix = "jabber.example.com"
host = "jabber.example.com"
jid  = "git"
password = "g!t"

old_rev, new_rev, refname = STDIN.read.split(/\s/)
branch     = refname.split('/').last
recipients = `git config notify.jabber`.split(" ") 
subject    = `cat #{File.join(File.dirname(__FILE__), "..", "description")}`
body       = `git log #{old_rev}..#{new_rev} --no-merges --name-only`

if branch == 'master'
  begin
    session = Jabber::Session.bind("#{jid}@#{host}/resource", password)
    recipients.each do |to|
      message = session.new_message("#{to}@#{user_suffix}")
      message.set_subject(subject)
      message.set_body(body)
      message.send
    end
  rescue Object => boom
    $stderr.puts "#{boom.class}: #{boom.message}"
  ensure
    session.release rescue nil
  end
end