Custom task for capistrano

deploy.rb

set :application, "set your application name here"
set :repository,  "set your repository location here"
set :deploy_to, "set path where to deploy application"

set :scm, :subversion
# Or: `accurev`, `bzr`, `cvs`, `darcs`, `git`, `mercurial`, `perforce`, `subversion` or `none`

role :web, "your web-server here"                          # Your HTTP server, Apache/etc


namespace :deploy
  desc "Update wurfl data"
  task :update_wurfl, :except => { :no_release => true } do
    # this will run commands on remote server 
    logger.info "Copying new wurfl data into shared path"
    run "cp -a #{release_path}/data/wurfl #{shared_path}/data/"
  end
end

# normal workflow is (indentation outlines subtasks)
# - update_code
#   - strategy.deploy
#   - finalize_update
#     # these aren't subtasks, but parts of finalize_update
#     - here data will be symlinked
#     - here zf is symlinked
# - symlink # update the current symoblic link

# your task insertion point
before 'deploy:finalize_update', 'deploy:update_wurfl'