Using NewRelic command to notify of deployment

newrelic_deployment.rb

# config(:branch) returns the branch being deployed.
# The newrelic command can accept an appname or appid, its undocumented, but it works.
# The appid can be found in the URL after logging in to NewRelic.

  def notify_newrelic
    sha1 = (`git rev-parse #{config(:branch)}`).chomp
    description = (`git log #{config(:branch)} -1 --format="%s"`).chomp
    command = "bundle exec newrelic deployments --appname=#{config(:application_id)} --revision=#{sha1} '#{description}'"
    puts command
    system command
  end