如何创建capistrano任务以下载最新的database_backup.tgz并在本地导入？

Question

我正在尝试使用类似于heroku db:pull功能的Capistrano任务做一些事情,如果你熟悉它.

我有一台远程服务器.在那台服务器上,我在/path/db_backups/文件夹中有一堆备份.在该文件夹中,每天都有数据库的备份.

我想做的就是

1. 在客户端计算机上下载最新的备份.
2. 解开它.
3. 将其导入本地mysql数据库.

有人知道处理这个问题的好方法吗？有没有我不知道的宝石？你有一个方便的脚本吗？

Answer 1

我不确定是否有宝石.我通常在capistrano(config/deploy.rb)上复制/调整此任务,从服务器中提取压缩数据库并将其存储在我的开发环境中

namespace :utils do
  desc 'pull the DB from the server'
  task :pull_db, :roles => :db, :only => { :primary => true } do

    website = "http://www.my_website.com"
    filename = "#{application}.dump.#{Time.now.to_f}.sql"
    filename_bz2 = "#{filename}.bz2"
    remote_file = "#{current_path}/public/#{filename_bz2}"


    text = capture "cat #{deploy_to}/current/config/database.yml"
    yaml = YAML::load(text)

    on_rollback { run "rm #{remote_file}" }
    run "mysqldump -h#{yaml[rails_env]['host']} -u #{yaml[rails_env]['username']} -p #{yaml[rails_env]['database']} | bzip2 -c > #{remote_file}" do |ch, stream, out|
      ch.send_data "#{yaml[rails_env]['password']}\n" if out =~ /^Enter password:/
    end

    local_text = run_locally("cat config/database.yml")
    local_yaml = YAML::load(local_text)

    run_locally("wget #{website}/#{filename_bz2}")
    run_locally("bzip2 -d #{filename_bz2}")

    run_locally("bundle exec rake db:drop")
    run_locally("bundle exec rake db:create")

    if local_yaml['development']['password'] && !local_yaml['development']['password'].blank?
      run_locally("mysql -h#{local_yaml['development']['host']} -u#{local_yaml['development']['username']} -p#{local_yaml['development']['password']} #{local_yaml['development']['database']} < #{filename}")
    else
      run_locally("mysql -h#{local_yaml['development']['host']} -u#{local_yaml['development']['username']} #{local_yaml['development']['database']} < #{filename}")
    end

    run_locally("rm #{filename}")
    run "rm #{remote_file}"
  end
end