attrbagger Cookbook

Gets your attributes from your bags.

Somewhat fancy.

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Inclusion of recipe[attrbagger::default] will result in the
keyspec_string => bag_cascade_string_array pairs specified in the
node['attrbagger']['configs'] hash being walked and merged into the
node's attribute precedence level specified via each hash's
precedence_level attribute. An example role using attrbagger to load
application-specific configuration from a base, custom, and dynamic
environment-specific data bag, as well as loading mail service
configuration might look like this:

name 'attrbagger_example'
description 'Attrbagger example role'

default_attributes(
  'deployment_env' => 'demo',
  'attrbagger' => {
    'configs' => {
      'example_app' => {
        'precedence_level' => 'override',
        'bag_cascade' => [
          'data_bag_item[applications::base::example_app]',
          'data_bag_item[applications::example_app]',
          "data_bag_item[applications::config_<%= node['deployment_env'] %>::example_app]"
        ]
      },
      'services::mail' => {
        'precedence_level' => 'default',
        'bag_cascade' => [
          'data_bag_item[services::mail]'
        ]
      }
    }
  },
  'example_app' => {
    'awesome' => true
  },
  'mail' => {
    'host' => 'localhost',
    'port' => 25
  }
)

run_list(
  'recipe[attrbagger]',
  # ... other stuff
)

This would result in the following actions:

• Load data_bag_item('applications', 'base') and merge its example_app hash with node.default['example_app'], then assign the result to node.override['example_app']
• Load data_bag_item('applications', 'example_app') and merge the entire data bag contents (except for builtin attributes like id and chef_type) with node.default['example_app'], then assign the result to node.override['example_app'].
• Load data_bag_item('applications', 'config_demo') and merge its example_app hash with node.default['example_app'], then assign the result to node.override['example_app']
• Load data_bag_item('services', 'mail') and merge the entire data bag contents (except for builtin attributes like id and chef_type) with node.default['services']['mail'], then assign the result to node.default['services']['mail'].