Capistrano recipe for Wordpress

deploy.rb

default_run_options[:pty] = true
load 'deploy' if respond_to?(:namespace) # cap2 differentiator
require 'capistrano'
require 'rubygems'
require 'railsless-deploy'

set :application, "vault42.org"
set :deploy_to, "/usr/local/www/#{application}"
set :backup_dir, "/home/tomislav/backup"
set :use_sudo, false
set :site_root, "#{deploy_to}/#{current_dir}"
set :keep_releases, 2

server 'vault42.org', :web, :app
role :db, 'vault42.org', :primary => true

# MySQL logins for backup
set :db_user, 'xxxxxx'
set :db_password, 'xxxxxxx'
set :db_database, 'vault42'

# Namespace of nginx's FastCGI cache
set :cache_namespace, 'vault'

# Git settings
set :scm, :git
set :local_repository, "ssh://overseer.vault42.org/home/tomislav/git/#{application}.git"
set :repository, "file:///home/tomislav/git/#{application}.git"
set :branch, 'master'
set :git_shallow_clone, 1

before 'deploy', 'db:backup'
before 'deploy:update_code', 'wordpress:symlinks:setup'

after 'deploy:symlink', 'wordpress:symlinks:update'
after "wordpress:symlinks:update", "deploy:cleanup"
after "deploy:cleanup", "cache:clear"

namespace :deploy do
    desc "A macro-task that updates the code and fixes the symlink."
    task :default do
        transaction do
            #make sure the release and htdocs directories exists
            run "mkdir -p #{deploy_to}/releases/", :once => true 
            run "rm -rf #{deploy_to}/public/", :once => true
            update_code #update the code from the latest version in the repository
            symlink  #see symlink task below
        end
    end

    task :update_code, :except => { :no_release => true } do
        on_rollback { run "rm -rf #{release_path}; true" }
        strategy.deploy!
    end

    after "symlink" do
        puts "Symlinking #{current_path} to #{site_root}."
        run "ln -nfs #{release_path} #{site_root}"
    end
end

namespace :wordpress do
    namespace :symlinks do
        desc "Setup application symlinks in the public directory"
        task :setup, :roles => [:web] do
                run "mkdir -p #{shared_path}/assets/"
        end

        desc "Link public directories to shared location."
        task :update, :roles => [:web] do
            #after we have copied the release to the server and symlinked it, we also symlink the assets directory
            run "rm -rf #{current_path}/public/assets/"

            #symlink assets in the current release to the one in shared
            run "ln -nfs #{shared_path}/assets #{current_path}/public/assets"

            # replace the db-config.php file with a link to the one in shared
            run "if [ ! -f #{shared_path}/wp-config-production.php ] ;then cp #{current_path}/config/wp-config-production.php #{shared_path}/; fi"
            run "ln -nfs #{shared_path}/wp-config-production.php #{release_path}/public/wp-config.php"
        end
    end    
end

namespace :db do 
  desc "Backup MySQL database"
  task :backup, :roles => :db, :only => { :primary => true } do
    filename = "#{backup_dir}/#{application}.dump.#{Time.now.to_f}.sql.bz2"

    on_rollback { run "rm #{filename}" }
    run "mysqldump -u #{db_user} -p #{db_database} | bzip2 -c > #{filename}" do |ch, stream, out|
      ch.send_data "#{db_password}\n" if out =~ /^Enter password:/
    end
    
    #Keep 14 days of backups
    run "find #{backup_dir} -type f -mtime +14 -exec rm {} \\;"
  end
end

namespace :cache do 
  desc "Clear nginx cache"
  task :clear, :roles => :app do
    sudo "/usr/local/bin/clearnginxcache #{cache_namespace}"
  end
end