Create a parameters.ini file interactively when deploying with capifony

deploy.rb

# This custom task for deploying a Symfony 2 application is set to run after deploy:setup 
# is executed. It interactively ask a user for database details to create a parameters.ini  
# thus avoiding having to manually on to the server and create it
#
# Helper function from http://stackoverflow.com/a/1662001/1041885
#
# Interactive parameter.ini generation adapted from http://adurieux.blogspot.co.uk/2011/10/using-capistrano.html

# ...
# ... Your deployment settings/tasks 
# ...

# This is required for the below task to work
set :shared_files,      ["app/config/parameters.ini"]

# Helper function for testing if a file exists
def remote_file_exists?(full_path)
  'true' ==  capture("if [ -e #{full_path} ]; then echo 'true'; fi").strip
end

namespace :custom_setup do

    task :create_parameters_file do
        
        unless remote_file_exists?("#{shared_path}/app/config/parameters.ini")

            # You can ask for more parameters here and set them in below 
            # ...but this is a starting point
            set :mysql_db_name, Capistrano::CLI.ui.ask("Enter MySQL database name: ")
            set :mysql_user, Capistrano::CLI.ui.ask("Enter MySQL database user: ")
            set :mysql_password, Capistrano::CLI.ui.ask("Enter MySQL database password: ")
            set :secret_token, Capistrano::CLI.ui.ask("Set a secret token for this app: ")

            # File parameters.ini
            template = <<-EOF
[parameters]
    database_driver    = pdo_mysql
    database_host      = localhost
    database_port      =
    database_name      = #{mysql_db_name}
    database_user      = #{mysql_user}
    database_password  = #{mysql_password}
    mailer_transport   = smtp
    mailer_host        = localhost
    mailer_user        =
    mailer_password    =
    locale             = en
    secret             = #{secret_token}
EOF
            # This may already be handled...
            run  "mkdir -p #{shared_path}/app/config"
            # Put the new parameters.ini file in...change this if you have a different path for 
            # your shared parameters file
            put ERB.new(template).result(binding), "#{shared_path}/app/config/parameters.ini"
        end

    end

end

after 'deploy:setup', 'custom_setup:create_parameters_file'