Capistrano recipe to clear the cached repo copy. Handy if you change repos. You'll see a "fatal: Could not parse object" error if you do change git repos and don't clear the cache

deploy.rb

desc "Clear cached copy"
task :clear_cached_copy do
     cached_copy_path = "#{shared_path}/cached-copy"
     cached_copy_exists = capture("if [ -d '#{cached_copy_path}' ]; then echo '1'; fi")
     if cached_copy_exists.to_i == 1
        puts "Removing cached copy"
        run "rm -fR #{cached_copy_path}"
     end
end