Capistrano task to remove the cached-copy folder when the SVN URL of the cached-copy is different to the SVN URL of the deployed code

deploy_cached_copy_check.rb

# When you switch SVN branches for deployment, Capistrano doesn't detect the change and 
# simply does an 'svn up' on whatever branch you had previously deployed.
# This task checks if the cached copy's SVN URL matches the SVN URL you're deploying, 
# and removes the cached copy if it doesn't match 
namespace :cached_copy do
  task :check do
    cached_copy_path = "#{shared_path}/cached-copy"
    
    # Does the cached copy exist?
    cached_copy_exists = capture("if [ -d '#{cached_copy_path}' ]; then echo '1'; fi")

    if cached_copy_exists.to_i == 1
      # Get the SVN URL of the cached copy
      cached_copy_svn_url = capture("svn info #{cached_copy_path} | grep URL | cut -c6-")

      # Are the cached copy and deployment SVN URLs different?
      if cached_copy_svn_url.chomp! != repository
        puts "Cached copy SVN URL is " + cached_copy_svn_url
        puts "Repository URL is " + repository
        puts "Removing cached copy"
        run "rm -fR #{cached_copy_path}"
      end
    end
  end
end