Capistrano Deploy Script

deploy.rb

default_run_options[:pty] = true  # Must be set for the password prompt from git to work

set :application, "my-awesome-app"
set :repository, "[email protected]:username/projectname.git"
set :scm, "git"

ssh_options[:forward_agent] = true

set :branch, "master"
set :deploy_via, :remote_cache
set :git_enable_submodules, 1

task :production do
  role :web, "192.168.0.1"
  role :web, "192.168.0.2"
  role :web, "192.168.0.3"
  
  set :stage, 'production'
  set :deploy_to, "/#{application}"
  set :deploy_via, :remote_cache
  
  after("deploy:symlink", "deploy:restart")
end

task :staging do
  role :web, "192.168.1.1"
  set :stage, 'staging'
  set :deploy_to, "/#{application}-staging"
  set :deploy_via, :copy
end

before :deploy do
  unless exists?(:deploy_to)
    raise "Please invoke me like `cap stage deploy` where stage is production/staging"
  end
end

namespace :deploy do
  desc "Restart apache."
  task :restart do
    sudo "/usr/sbin/apachectl graceful"
  end
  
  desc "Send a deployment notification"
  task :notify do
    to = ['[email protected]', '[email protected]']
    changes = `git log --no-merges --pretty=format:"* %s %b (%cn)" #{previous_revision}.. | replace '<unknown>' ''`
    
    if not changes.empty?
      puts "Sending email to: #{to}"
      send_email to, {:body => "Deployed changes:\n#{changes}", :subject => "Deploying to #{stage}"}
    end
  end
  
  desc "Creates the necessary data directories."
  task :createdirs do
    run "mkdir -p #{deploy_to}/data/cache #{deploy_to}/data/storage"
    run "mkdir -p #{deploy_to}/public_cache/css #{deploy_to}/public_cache/js"
  end
  
  desc "Creates symlinks and ensures the necessary directories are writable"
  task :dirfix do
    run "rm -rf #{current_release}/data #{current_release}/public/cache"
    run "ln -s #{deploy_to}/data #{current_release}/data"
    run "ln -s #{deploy_to}/public_cache #{current_release}/public/cache"
    sudo "chown apache:apache #{deploy_to}/data -R"
    sudo "chown apache:apache #{deploy_to}/public_cache -R"
    sudo "chown apache:apache #{current_release} -R"
  end
  
  desc "Migrates the database changes."
  task :doctrine do
    changes = capture("#{current_release}/bin/doctrine -e #{stage} -- orm:schema-tool:update --dump-sql")
    if !(changes.include? "Nothing to update")
      puts "Pending database updates:\n#{changes}"
      
      migrate = Capistrano::CLI.ui.ask "Would you like to update the database (Y/n)? "
      if migrate.empty? || migrate != 'n'
        run "#{current_release}/bin/doctrine -e #{stage} -- orm:schema-tool:update --force"
      end
    end
  end
end

namespace :logs do
  desc "Tails the remote error logs."
  task :watch, :on_error => :continue do
    run "tail -f /var/log/php_errors.log" do |channel, stream, data|
      trap("INT") { puts 'Interupted'; exit 0; }
      puts  # for an extra line break before the host name
      puts "#{channel[:host]}: #{data}"
      break if stream == :err
    end
  end
end

before("deploy:symlink", "deploy:notify")
before("deploy:symlink", "deploy:createdirs")
before("deploy:symlink", "deploy:dirfix")
before("deploy:symlink", "deploy:doctrine")

# Email function for deployment notifications.
require 'net/smtp'

def send_email(to, opts={})
  opts[:server]      ||= 'localhost'
  opts[:from]        ||= '[email protected]'
  opts[:from_alias]  ||= 'Capistrano'
  opts[:subject]     ||= "Deployment Summary"
  opts[:body]        ||= "Code has been deployed..."
  
  msg = <<END_OF_MESSAGE
From: #{opts[:from_alias]} <#{opts[:from]}>
To: #{to.join(', ')}
MIME-Version: 1.0
Content-type: text/plain
Subject: #{opts[:subject]}

#{opts[:body]}
END_OF_MESSAGE
  
  Net::SMTP.start(opts[:server]) do |smtp|
    smtp.send_message msg, opts[:from], to
  end
end