Git post-checkout hook changing database.yml

post-checkout

#!/usr/bin/env ruby

require 'fileutils'

# Change working directory to repository
Dir.chdir(File.join(File.dirname(__FILE__), '..', '..'))

branch = `git branch | grep '*' | cut -c 3-`.chomp

new_db_config_file = File.join('config', "database.#{branch}.yml")
if File.exists?(new_db_config_file)
  actual_db_config_file = File.join('config', 'database.yml')
  FileUtils.cp(actual_db_config_file, File.join('config', 'database.yml.backup'))
  FileUtils.cp(new_db_config_file, actual_db_config_file)
  puts "#{__FILE__}: config/database.yml modified"
end