gistfile1.rb

require 'fileutils'
require 'openstack'
set :application, "projects_assets"
set :assets_root, '/path/to/project'
set :repository,  "#{assets_root}/public/assets"


set :scm, :none # You can set :scm explicitly or Capistrano will make an intelligent guess based on known version control directory names
# Or: `accurev`, `bzr`, `cvs`, `darcs`, `git`, `mercurial`, `perforce`, `subversion` or `none`
set :deploy_via, :copy

set :copy_compression,    :gzip

before 'deploy:update', 'deploy:assets_precompile', 'deploy:openstack'
after 'deploy:create_symlink', 'deploy:assets_clean'

#role :web, "your web-server here"                          # Your HTTP server, Apache/etc
role :app, "123.456.789.101"                          # This may be the same as your `Web` server
#role :db,  "your primary db-server here", :primary => true # This is where Rails migrations will run
#role :db,  "your slave db-server here"

set :deploy_to, "/path/to/#{application}"
set :use_sudo, false
default_run_options[:pty] = true


namespace :deploy do

  task :assets_precompile do
    system "cd #{ assets_root }&&rake assets:precompile"
  end

  task :assets_clean do
    system "cd #{ assets_root }&&rake assets:clean"
  end

  task :openstack do

    os = OpenStack::Connection.create username: 'username',
                                      api_key: 'api_key', 
                                      :auth_url => 'https://auth_url/',
                                      :service_type => 'object-store'

    c = os.get_container( 'assets' )

    local_files_list = Dir.entries( repository ).select{|file_name| file_name != '.' && file_name != '..' }
    remote_files_list = c.objects
    remote_files_detail = c.objects_detail

    ( remote_files_list - local_files_list ).each{|file_name|
      c.delete_object file_name
      remote_files_detail.delete file_name
    }

    local_files_list.each{|file_name|
      full_file_name = "#{ repository }/#{ file_name }"

      o = if remote_files_detail[file_name].nil?
            c.create_object file_name
          else
            next if remote_files_detail[file_name][:hash] == `md5sum #{full_file_name}`.split(' ')[0]
            c.get_object file_name
          end

      mime_type = if file_name =~ /\.css$/
                    'text/css; charset=utf-8'
                  elsif file_name =~ /\.js$/
                    'application/javascript; charset=utf-8'
                  else
                    `file --mime -b #{ full_file_name }`.strip
                  end

      p [ o.write( File.new(full_file_name), 'content-type' => mime_type ), file_name ]
    }

  end

end