deploy.rb

require "bundler/capistrano"

# --------------------------------------------------
# nginx
namespace :nginx do
  %w[start stop restart].each do |command|
    desc "#{command} nginx"
    task "#{command}", roles: :web do
      sudo "service nginx #{command}"
    end
  end
  after "unicorn:start", "nginx:restart"
end
# --------------------------------------------------
# unicorn
namespace :unicorn do
  %w[start stop restart].each do |command|
    desc "#{command} unicorn server"
    task "#{command}", roles: :app, except: {no_release: true} do
      run "/etc/init.d/unicorn_#{application} #{command}"
    end
  end

  desc "tail unicorn log file"
  task :tail_log, roles: :app do
    trap("INT") { puts 'Interupted'; exit 0; }
    run "tail -f #{shared_path}/log/unicorn.log" do |channel, stream, data|
      puts  # for an extra line break before the host name
      puts "#{channel[:host]}: #{data}"
      break if stream == :err
    end
  end

  desc "Setup unicorn configuration for this application"
  task :setup, roles: :app do
    run "mkdir -p /home/#{user}/.unicorn/#{application}"
    run "cd /home/#{user}/.unicorn/#{application} && wget -O config.rb https://raw.github.com/gist/5131682/unicorn_conf.rb"
    run "cd /home/#{user}/.unicorn/#{application} && ruby -pi -e \"gsub(/appname/, '#{application}')\" config.rb"
    run "cd /home/#{user}/.unicorn/#{application} && wget -O init.sh https://raw.github.com/gist/5130853/unicorn_init.sh"
    run "cd /home/#{user}/.unicorn/#{application} && ruby -pi -e \"gsub(/appname/, '#{application}')\" init.sh && chmod +x init.sh"
    sudo "ln -nfs /home/#{user}/.unicorn/#{application}/init.sh /etc/init.d/unicorn_#{application}"
  end

  desc "Autostart unicorn"
  task :autostart, roles: :app do
    sudo "update-rc.d unicorn_#{application} defaults"
  end

  after "deploy:cold", "unicorn:setup"
  after "unicorn:setup", "unicorn:autostart"
  after "unicorn:autostart", "unicorn:start"

  after "deploy", "unicorn:restart"
  after "deploy:rollback", "unicorn:restart"
end
# --------------------------------------------------
# mysql
def set_default(name, *args, &block)
  set(name, *args, &block) unless exists?(name)
end

set_default(:db_name) { Capistrano::CLI.ui.ask "Database name: " }
set_default(:mysql_password) { Capistrano::CLI.password_prompt "MySQL Password: " }

namespace :mysql do
  desc "Create mysql db - cap deploy:mysql:create_db"
  task :create_db, roles: :db do
    run "mysqladmin -u root -p#{mysql_password} create #{db_name}"
  end
end
# --------------------------------------------------
# check
namespace :check do
  desc "Make sure local git is in sync with remote."
  task :revision, roles: :web do
    unless `git rev-parse HEAD` == `git rev-parse origin/#{branch}`
      puts "WARNING: HEAD is not the same as origin/#{branch}"
      puts "Run `git push` to sync changes."
      exit
    end
  end
  before "deploy", "check:revision"
  before "deploy:migrations", "check:revision"
  before "deploy:cold", "check:revision"
end
# --------------------------------------------------
# log
desc "tail production log file"
task :tail_production_log, roles: :app do
  trap("INT") { puts 'Interupted'; exit 0; }
  run "tail -f #{shared_path}/log/production.log" do |channel, stream, data|
    puts  # for an extra line break before the host name
    puts "#{channel[:host]}: #{data}"
    break if stream == :err
  end
end
# --------------------------------------------------
# sake
# $ bundle exec cap sake task="cache:update_cached_tags"
# http://jessewolgamott.com/blog/2012/09/10/the-one-where-you-run-rake-commands-with-capistrano/
desc "Run a task on a remote server"
task :sake, roles: :app do
  run("cd #{deploy_to}/current && bundle exec rake #{ENV['task']} RAILS_ENV=#{rails_env}")
end
# --------------------------------------------------
# namespace :deploy do
#   desc "Setup config"
#   task :setup_config, roles: :app do
#     run "mkdir -p #{shared_path}/config"
#     put File.read("config/database.example.yml"), "#{shared_path}/config/database.yml"
#     put File.read("config/config.example.yml"), "#{shared_path}/config/config.yml"
#     puts "Now edit the config files in #{shared_path}."
#   end
#   after "deploy:setup", "deploy:setup_config"

#   desc "Symlink config"
#   task :symlink_config, roles: :app do
#     run "ln -nfs #{shared_path}/config/database.yml #{release_path}/config/database.yml"
#     run "ln -nfs #{shared_path}/config/config.yml #{release_path}/config/config.yml"
#   end
#   after "deploy:finalize_update", "deploy:symlink_config"
# end
# --------------------------------------------------

set :application, 'APPNAME'
#set :repository,  "git@bitbucket.org:USERNAME/#{application}.git"
set :repository,  "git@github.com:USERNAME/#{application}.git"
set :branch, "master"
set :user, "deployer"
set :deploy_to, "/home/#{user}/apps/#{application}"
set :use_sudo, false

default_environment["PATH"] = "/home/#{user}/.rbenv/shims:/home/#{user}/.rbenv/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games"

server "DOMAIN", :web, :app, :db, primary: true
# ssh_options[:port] = 888

after "deploy", "deploy:cleanup" # keep only the last 5 releases