Capistrano task to tag git revision on deployment

git-tag.rake

namespace :deploy do
  after :finishing, :git_tag do
    run_locally do
      if fetch(:skip_git_tag, false)
        info "[git-tag] Tagging of deployment skipped"
      else
        user = capture(:git, "config --get user.name")
        email = capture(:git, "config --get user.email")

        tag_msg = "Deployed by #{user} <#{email}>"
        tag_time = Time.new.utc.strftime("%Y%m%d-%H%M%S")
        tag_name = "#{fetch :stage}-#{tag_time}"

        strategy.git "tag -a #{tag_name} -m \"#{tag_msg}\" #{fetch :current_revision}"
        strategy.git "push origin #{tag_name}"

        info "[git-tag] Tagged #{fetch :current_revision} with #{tag_name}"
      end
    end
  end
end