rubberdeploy.rb

# This is a sample Capistrano config file for rubber

set :rails_env, Rubber.env

on :load do
  set :application, rubber_env.app_name
  set :runner,      rubber_env.app_user
  set :deploy_to,   "/mnt/#{application}-#{Rubber.env}"
  set :copy_exclude, [".git/*", ".bundle/*", "log/*", ".rvmrc", ".rbenv-version"]
  set :assets_role, [:app]
end

# Use a simple directory tree copy here to make demo easier.
# You probably want to use your own repository for a real app
set :scm, :none
set :repository, "."
set :deploy_via, :copy

# Easier to do system level config as root - probably should do it through
# sudo in the future.  We use ssh keys for access, so no passwd needed
set :user, 'root'
set :password, nil

# Use sudo with user rails for cap deploy:[stop|start|restart]
# This way exposed services (mongrel) aren't running as a privileged user
set :use_sudo, true

# How many old releases should be kept around when running "cleanup" task
set :keep_releases, 3

# Lets us work with staging instances without having to checkin config files
# (instance*.yml + rubber*.yml) for a deploy.  This gives us the
# convenience of not having to checkin files for staging, as well as 
# the safety of forcing it to be checked in for production.
set :push_instance_config, Rubber.env != 'production'

# don't waste time bundling gems that don't need to be there 
set :bundle_without, [:development, :test, :staging] if Rubber.env == 'production'

# Allow us to do N hosts at a time for all tasks - useful when trying
# to figure out which host in a large set is down:
# RUBBER_ENV=production MAX_HOSTS=1 cap invoke COMMAND=hostname
max_hosts = ENV['MAX_HOSTS'].to_i
default_run_options[:max_hosts] = max_hosts if max_hosts > 0

# Allows the tasks defined to fail gracefully if there are no hosts for them.
# Comment out or use "required_task" for default cap behavior of a hard failure
rubber.allow_optional_tasks(self)

# Wrap tasks in the deploy namespace that have roles so that we can use FILTER
# with something like a deploy:cold which tries to run deploy:migrate but can't
# because we filtered out the :db role

namespace :deploy do
  rubber.allow_optional_tasks(self)
  tasks.values.each do |t|
    if t.options[:roles]
      task t.name, t.options, &t.body
    end
  end
end


namespace :deploy do
  namespace :assets do
    rubber.allow_optional_tasks(self)
    tasks.values.each do |t|
      if t.options[:roles]
        task t.name, t.options, &t.body
      end
    end
  end
end

# load in the deploy scripts installed by vulcanize for each rubber module
Dir["#{File.dirname(__FILE__)}/rubber/deploy-*.rb"].each do |deploy_file|
  load deploy_file
end

# capistrano's deploy:cleanup doesn't play well with FILTER
after "deploy", "cleanup"
after "deploy:migrations", "cleanup"
task :cleanup, :except => { :no_release => true } do
  count = fetch(:keep_releases, 5).to_i
  
  rsudo <<-CMD
    all=$(ls -x1 #{releases_path} | sort -n);
    keep=$(ls -x1 #{releases_path} | sort -n | tail -n #{count});
    remove=$(comm -23 <(echo -e "$all") <(echo -e "$keep"));
    for r in $remove; do rm -rf #{releases_path}/$r; done;
  CMD
end

namespace :deploy do 
  namespace :assets do
    desc "Precompile assets on local machine and upload them to the server."
    task :precompile, roles: :web, except: {no_release: true} do
      logger.info "Precompile assets locally....."
      from = source.next_revision(current_revision)
      if releases.length <= 1 || capture("cd #{latest_release} && #{source.local.log(from)} vendor/assets/ app/assets/ | wc -l").to_i > 0
        run_locally "bundle exec rake assets:precompile"
        find_servers_for_task(current_task).each do |server|
          run_locally "rsync -vr --exclude='.DS_Store' public/assets #{user}@#{server.host}:#{shared_path}/"
          run_locally "rm -rf public/assets"
        end
      else
        logger.info "Skipping asset pre-compilation because there were no asset changes"
      end
    end
  end
end

# We need to ensure that rubber:config runs before asset precompilation in Rails, as Rails tries to boot the environment,
# which means needing to have DB access.  However, if rubber:config hasn't run yet, then the DB config will not have
# been generated yet.  Rails will fail to boot, asset precompilation will fail to complete, and the deploy will abort.
if Rubber::Util.has_asset_pipeline?
  load 'deploy/assets'

  callbacks[:after].delete_if {|c| c.source == "deploy:assets:precompile"}
  callbacks[:before].delete_if {|c| c.source == "deploy:assets:symlink"}
  before "deploy:assets:precompile", "deploy:assets:symlink"
  after "rubber:config", "deploy:assets:precompile"
end