Mina Deploy RollBack

gistfile1.rb

desc "Rolls back the latest release"
task :rollback => :environment do
  queue! %[echo "-----> Rolling back to previous release for instance: #{domain}"]

  # Delete existing sym link and create a new symlink pointing to the previous release
  queue %[echo -n "-----> Creating new symlink from the previous release: "]
  queue %[ls "#{deploy_to}/releases" -Art | sort | tail -n 2 | head -n 1]
  queue! %[ls -Art "#{deploy_to}/releases" | sort | tail -n 2 | head -n 1 | xargs -I active ln -nfs "#{deploy_to}/releases/active" "#{deploy_to}/current"]

  # Remove latest release folder (active release)
  queue %[echo -n "-----> Deleting active release: "]
  queue %[ls "#{deploy_to}/releases" -Art | sort | tail -n 1]
  queue! %[ls "#{deploy_to}/releases" -Art | sort | tail -n 1 | xargs -I active rm -rf "#{deploy_to}/releases/active"]
end

When you reach more then 9 releases you may run into trouble with sort, it may sort your numbers like strings. I changed sort to sort -n.