lib/backup.rb


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require 'yaml'

class Backup
  attr_reader :config, :db_dir

  def initialize
    @config = YAML.load_file(File.join(Rails.root,'config','database.yml'))[Rails.env]
    @db_dir = File.join(Gitlab.config.backup.path, 'db')
    FileUtils.mkdir_p(@db_dir) unless Dir.exists?(@db_dir)
  end

  def backup_db
    case config["adapter"]
    when /^mysql/ then
      system("mysqldump #{mysql_args} #{config['database']} > #{db_file_name}")
    when "postgresql" then
      pg_env
      system("pg_dump #{config['database']} > #{db_file_name}")
    end
  end

  def restore_db
    case config["adapter"]
    when /^mysql/ then
      system("mysql #{mysql_args} #{config['database']} < #{db_file_name}")
    when "postgresql" then
      pg_env
      system("pg_restore #{config['database']} #{db_file_name}")
    end
  end

  protected

  def db_file_name
    File.join(db_dir, 'database.sql')
  end

  def mysql_args
    args = {
      'host'      => '--host',
      'port'      => '--port',
      'socket'    => '--socket',
      'username'  => '--user',
      'encoding'  => '--default-character-set',
      'password'  => '--password'
    }
    args.map { |opt, arg| "#{arg}=#{config[opt]}" if config[opt] }.compact.join(' ')
  end

  def pg_env
    ENV['PGUSER']     = config["username"] if config["username"]
    ENV['PGHOST']     = config["host"] if config["host"]
    ENV['PGPORT']     = config["port"].to_s if config["port"]
    ENV['PGPASSWORD'] = config["password"].to_s if config["password"]
  end
end