Really simple script for installing rails apps when you can't deploy with Capistrano. Just zip up the app and run ./install.rb zipfile

install.rb

#!/bin/env ruby
ENV['RAILS_ENV'] = 'production'

require 'fileutils'

def sudo(cmd, as = 'root')
  puts "sudo: #{cmd}"
  system("sudo -u #{as} #{cmd}")
end

def sys(cmd)
  puts "exec: #{cmd}"
  system(cmd)
end

begin
  if ARGV.length != 1
    puts "Usage: #{File.basename(__FILE__)} ziparchive"
    exit 1
  end

  file = ARGV[0]
  app_id   = file.gsub(/.zip$/i, '')
  raise "Missing file: #{file}" if file.nil? or !File.exist?(file)
  raise "Expecting zip file: #{filename}" unless file =~ /.zip$/i

  app_root = File.expand_path(File.dirname(__FILE__))
  app_name = File.basename(app_root)

  release  = File.join(app_root, 'releases')
  app_path = File.join(release, app_id, app_name)
  shared   = File.join(app_root, 'shared')
  current  = File.join(app_root, 'current')

  sys("mkdir -p #{shared} >/dev/null 2>&1")
  sys("mkdir -p #{shared}/vendor/bundle >/dev/null 2>&1")
  sys("mkdir -p #{shared}/log >/dev/null 2>&1")
  sys("mkdir -p #{shared}/uploads >/dev/null 2>&1")
  sys("mkdir -p #{shared}/tmp/pids >/dev/null 2>&1")
  sys("mkdir -p #{release} >/dev/null 2>&1")
  sys("mkdir -p #{release}/#{app_id} >/dev/null 2>&1")

  sys("unzip #{file} -d #{release}/#{app_id}")
  raise "Failed to unzip to the right location. Expected: #{app_path}" unless File.exist?(app_path)

  sys("rm -f #{current}")
  sys("ln -s #{app_path} #{current}")
  sys("rm -rf #{current}/log")
  sys("ln -s #{shared}/log #{current}/log")
  sys("ln -s #{shared}/uploads #{current}/public/uploads")
  sys("ln -s #{shared}/tmp #{current}/tmp")
  sys("ln -s #{shared}/vendor/bundle #{current}/vendor/bundle")

  FileUtils.chdir(current) do
    sys("rm -f .env")
    File.open(".env", "w") do |f|
      f.puts "RAILS_ENV=production"
    end

    sys("bundle install --deployment --without test development")
    sys("rake db:migrate")
    sys("rake assets:precompile")
    sudo("stop erapp")
    while (`/usr/sbin/lsof -t -itcp:3000`.length > 0)
      puts "Waiting ..."
      sleep 1
    end
    sudo("bundle exec foreman export upstart /etc/init --app=erapp --user=appadm --procfile=Procfile")
    sudo("start erapp")
  end
end