mina-deployment-example.rb

#settings
set :user, 'deployer'
set :domain, ENV['on'] == 'prod' ? '<prod ip>' : '<qa ip>'
set :deploy_to, '/var/www/example.com'
set :repository, 'git@github.com:your_company/sample.git'
set :branch, 'master'


task :provision do
  # add nginx repo  
  invoke :'nginx:add_repo'
  
  queue  "sudo yum install -y git gcc gcc-c++* make openssl-devel mysql-devel curl-devel nginx sendmail-cf ImageMagick"

  #install rbenv
  queue  "source ~/.bash_profile"
  queue  "#{exists('rbenv')} || git clone https://github.com/sstephenson/rbenv.git ~/.rbenv"
  queue  "#{exists('rbenv')} || git clone https://github.com/sstephenson/ruby-build.git ~/.rbenv/plugins/ruby-build"
  queue  "#{exists('rbenv')} || echo 'export PATH=\"$HOME/.rbenv/bin:$PATH\"' >> ~/.bash_profile && source ~/.bash_profile"

  #install ruby
  queue  "#{ruby_exists} || RUBY_CONFIGURE_OPTS=--with-openssl-dir=/usr/bin rbenv install #{ruby_version}"

  #install bundle
  queue  "#{ruby_exists} || rbenv local 2.0.0-p247"
  queue  "#{exists('gem')} || gem install bundle --no-ri --no-rdoc"

  #set up deploy to
  queue "sudo mkdir -p #{deploy_to}"
  queue "sudo chown -R #{user} #{deploy_to}"

end

#helper method
def ruby_exists
"rbenv versions | grep #{ruby_version} >/dev/null 2>&1"
end

def exists cmd
  "command -v #{cmd}>/dev/null 2>&1"
end


task :deploy do
  deploy do
    invoke :'git:clone'   #clone code from github
    invoke :'deploy:link_shared_paths' #linking shared file with latest file we just cloned
    invoke :'bundle:install' #install bundle
    invoke :'rails:db_migrate' #run database migration
    invoke :'rails:assets_precompile' #compile assets
    invoke :'unicorn_and_nginx' #setup nginx and unicorn config
    to :launch do
      queue '/etc/init.d/unicorn_myapp.sh reload' #reload unicorn after deployment succeed
    end
  end
end


task :unicorn_and_nginx do
  queue! "#{file_exists('/etc/nginx/nginx.conf.save')} || sudo mv /etc/nginx/nginx.conf /etc/nginx/nginx.conf.save"

  queue! "#{file_exists('/etc/nginx/nginx.conf')} || sudo ln -nfs #{deploy_to}/current/config/nginx.conf /etc/nginx/nginx.conf"

  queue! "#{file_exists('/etc/init.d/unicorn_avalon.sh')} || sudo ln -nfs #{deploy_to}/current/scripts/unicorn.sh /etc/init.d/unicorn_myapp.sh"
end