deploy.rb

# config valid only for current version of Capistrano
lock '3.3.5'

set :application, 'desert'
set :repo_url, '[email protected]:agmcleod/dune.git'
set :assets_roles, [:web, :app]

# Default branch is :master
# ask :branch, proc { `git rev-parse --abbrev-ref HEAD`.chomp }.call

# Default deploy_to directory is /var/www/my_app_name
set :deploy_to, '/var/www/apps/desert'
set :linked_files, %w{config/database.yml config/secrets.yml config/application.yml}
set :linked_dirs, %w(tmp/pids tmp/sockets)
set :keep_releases, 5

namespace :deploy do

  def unicorn_start_cmd
    "cd #{release_path} && bundle exec unicorn -c unicorn/config.rb -E #{rails_env} -D"
  end

  task :restart do
    on roles(:app) do
      running = capture("[ -f /var/www/apps/desert/current/tmp/pids/unicorn.pid ] || printf '0'")
      restart_command = if running != "0"
        old_pid = capture("cat /var/www/apps/desert/current/tmp/pids/unicorn.pid")
        "kill -USR2 #{old_pid}; sleep 5;  kill -QUIT #{old_pid}"
      else
        unicorn_start_cmd
      end
      execute restart_command
    end
  end

  after :deploy, :restart

end