small sinatra app to listen for a post-receive hook and deploy my blog 5minutenpause.com

publisher.rb

require 'sinatra'
require 'json'

post '/' do
   if params && params[:payload]
     push = JSON.parse(params[:payload])
     commits = push['commits']
     num_of_commits = push['commits'].length
     last_commit_message = commits[num_of_commits-1]['message']
     if last_commit_message =~ /publish/
       output = `cd local_octopress_directory && git pull ; cd local_octopress_directory && bundle install ; cd local_octopress_directory && bundle exec rake -f local_octopress_directory/Rakefile gen_deploy RAILS_ENV=development 2>&1`
       "deployed to site: #{output}"
     else
       'nothing to publish. doing nothing'
     end
   end
end

get '/' do
  'nothing to see here.'
end