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capistrano_database.rb
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capistrano_database.rb
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#
# = Capistrano database.yml task
#
# Provides a couple of tasks for creating the database.yml
# configuration file dynamically when deploy:setup is run.
#
# Category:: Capistrano
# Package:: Database
# Author:: Simone Carletti <weppos@weppos.net>
# Copyright:: 2007-2009 The Authors
# License:: MIT License
# Link:: http://www.simonecarletti.com/
# Source:: http://gist.github.com/2769
#
#
# == Requirements
#
# This extension requires the original <tt>config/database.yml</tt> to be excluded
# from source code checkout. You can easily accomplish this by renaming
# the file (for example to database.example.yml) and appending <tt>database.yml</tt>
# value to your SCM ignore list.
#
# # Example for Subversion
#
# $ svn mv config/database.yml config/database.example.yml
# $ svn propset svn:ignore 'database.yml' config
#
# # Example for Git
#
# $ git mv config/database.yml config/database.example.yml
# $ echo 'config/database.yml' >> .gitignore
#
#
# == Usage
#
# Include this file in your <tt>deploy.rb</tt> configuration file.
# Assuming you saved this recipe as capistrano_database.rb:
#
# require "capistrano_database"
#
# Now, when <tt>deploy:setup</tt> is called, this script will automatically
# create the <tt>database.yml</tt> file in the shared folder.
# Each time you run a deploy, this script will also create a symlink
# from your application <tt>config/database.yml</tt> pointing to the shared configuration file.
#
# == Custom template
#
# By default, this script creates an exact copy of the default
# <tt>database.yml</tt> file shipped with a new Rails 2.x application.
# If you want to overwrite the default template, simply create a custom Erb template
# called <tt>database.yml.erb</tt> and save it into <tt>config/deploy</tt> folder.
#
# Although the name of the file can't be changed, you can customize the directory
# where it is stored defining a variable called <tt>:template_dir</tt>.
#
# # store your custom template at foo/bar/database.yml.erb
# set :template_dir, "foo/bar"
#
# # example of database template
#
# base: &base
# adapter: sqlite3
# timeout: 5000
# development:
# database: #{shared_path}/db/development.sqlite3
# <<: *base
# test:
# database: #{shared_path}/db/test.sqlite3
# <<: *base
# production:
# adapter: mysql
# database: #{application}_production
# username: #{user}
# password: #{Capistrano::CLI.ui.ask("Enter MySQL database password: ")}
# encoding: utf8
# timeout: 5000
#
# Because this is an Erb template, you can place variables and Ruby scripts
# within the file.
# For instance, the template above takes advantage of Capistrano CLI
# to ask for a MySQL database password instead of hard coding it into the template.
#
# === Password prompt
#
# For security reasons, in the example below the password is not
# hard coded (or stored in a variable) but asked on setup.
# I don't like to store passwords in files under version control
# because they will live forever in your history.
# This is why I use the Capistrano::CLI utility.
#
unless Capistrano::Configuration.respond_to?(:instance)
abort "This extension requires Capistrano 2"
end
Capistrano::Configuration.instance.load do
namespace :db do
desc <<-DESC
Creates the database.yml configuration file in shared path.
By default, this task uses a template unless a template \
called database.yml.erb is found either is :template_dir \
or /config/deploy folders. The default template matches \
the template for config/database.yml file shipped with Rails.
When this recipe is loaded, db:setup is automatically configured \
to be invoked after deploy:setup. You can skip this task setting \
the variable :skip_db_setup to true. This is especially useful \
if you are using this recipe in combination with \
capistrano-ext/multistaging to avoid multiple db:setup calls \
when running deploy:setup for all stages one by one.
DESC
task :setup, :except => { :no_release => true } do
default_template = <<-EOF
base: &base
adapter: mysql
encoding: utf8
username: #{db_user}
password: #{db_pass}
development:
database: #{db_prefix}_development
<<: *base
test:
database: #{db_prefix}_test
<<: *base
production:
database: #{db_prefix}_production
<<: *base
EOF
location = fetch(:template_dir, "config/deploy") + '/database.yml.erb'
template = File.file?(location) ? File.read(location) : default_template
config = ERB.new(template)
run "mkdir -p #{shared_path}/db"
run "mkdir -p #{shared_path}/config"
put config.result(binding), "#{shared_path}/config/database.yml"
end
desc <<-DESC
[internal] Updates the symlink for database.yml file to the just deployed release.
DESC
task :symlink, :except => { :no_release => true } do
run "ln -nfs #{shared_path}/config/database.yml #{release_path}/config/database.yml"
end
end
after "deploy:setup", "db:setup" unless fetch(:skip_db_setup, false)
after "deploy:finalize_update", "db:symlink"
end