Chef::Sugar

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Chef Sugar is a Gem & Chef Recipe that includes series of helpful sugar of the Chef core and other resources to make a cleaner, more lean recipd DSL, enforce DRY principles, and make writing Chef recipes an awesome experience!

Installation

If you want to development/hack on chef-sugar, please see the Contributing.md.

If you are using Berkshelf, add chef-sugar to your Berksfile:

cookbook 'chef-sugar'

Otherwise, you can use knife or download the tarball directly from the community site:

knife cookbook site install chef-sugar

Usage

In order to use Chef Sugar in your Chef Recipes, you'll first need to include it:

include_recipe 'chef-sugar::default'

Alternatively you can put it in a base role or recipe and it will be included subsequently.

Requiring the Chef Sugar Gem will automatically extend the Recipe DSL, Chef::Resource, and Chef::Provider with helpful convienence methods.

Module Method

If you are working outside of the Recipe DSL, you can use the module methods instead of the Recipe DSL. In general, the module methods have the same name as their Recipe-DSL counterparts, but require the node object as a parameter. For example:

In a Recipe:

# cookbook/recipes/default.rb
do_something if windows?

In a Library as a singleton:

# cookbook/libraries/default.rb
def only_on_windows(&block)
  yield if Chef::Sugar::PlatformFamily.windows?(@node)
end

In a Library as a Mixin:

# cookbook/libraries/default.rb
include Chef::Sugar::PlatformFamily

def only_on_windows(&block)
  yield if windows?(@node)
end

API

Note: For the most extensive API documentation, please see the YARD documentation.

Architecture

Note: Some of the architecture commands begin with an underscore (_) because Ruby does not permit methods to start with a numeric.

  • _64_bit?
  • _32_bit?

Examples

execute 'build[my binary]' do
  command '...'
  not_if  { _64_bit? }
end

Cloud

  • azure?
  • cloud?
  • ec2?
  • eucalyptus?
  • gce?
  • linode?
  • openstack?
  • cloudstack?
  • rackspace?

Examples

template '/tmp/config' do
  variables(
    # See also: best_ip_for
    ipaddress: cloud? ? node['local_ipv4'] : node['public_ipv4']
  )
end

Data Bag

  • encrypted_data_bag_item - a handy DSL method for loading encrypted data bag items the same way you load a regular data bag item; this requires Chef::Config[:encrypted_data_bag_secret] is set!
  • encrypted_data_bag_item_for_environment - find the data bag entry for the current node's Chef environment.

Examples

encrypted_data_bag_item('accounts', 'hipchat')

encrypted_data_bag_item_for_environment('accounts', 'github')

IP

  • best_ip_for - determine the best IP address for the given "other" node, preferring local IP addresses over public ones.

Examples

redis = search('node', 'role:redis').first

template '/tmp/config' do
  variables(
    ipaddress: best_ip_for(redis)
  )
end

Node

  • in? - determine if the node is in the given Chef environment.
  • includes_recipe?

Examples

credentials = if in?('production')
                Chef::EncryptedDataBag.new('...')
              else
                data_bag('...')
              end

if includes_recipe?('apache2::default')
  apache_module 'my_module' do
    # ...
  end
end

Platform

  • amazon_linux?
  • centos?
  • linux_mint?
  • oracle_linux?
  • redhat_enterprise_linux?
  • scientific_linux?
  • ubuntu?

There are also a series of dynamically defined matchers that map named operating system release versions and comparison operators in the form "#platform_#operator_#name?". For example:

  • debian_after_squeeze?
  • linuxmint_after_or_at_olivia?
  • mac_os_x_lion?
  • ubuntu_before_lucid?
  • ubuntu_before_or_at_maverick?

To get a full list, run the following in IRB:

require 'chef/sugar'
puts Chef::Sugar::Platform.instance_methods

Examples

if ubuntu?
  execute 'apt-get update'
end

Platform Family

  • arch_linux?
  • debian?
  • fedora?
  • freebsd?
  • gentoo?
  • linux?
  • mac_os_x?
  • openbsd?
  • rhel?
  • slackware?
  • suse?
  • windows?

Examples

node['attribute'] = if windows?
                      'C:\Foo\BarDrive'
                    else
                      '/foo/bar_drive'
                    end

Ruby

Note: The applies to the the Ruby found at node['languages']['ruby'].

  • ruby_20?
  • ruby_19?

Examples

log 'This has been known to fail on Ruby 2.0' if ruby_20?

Shell

  • which
  • dev_null
  • installed?
  • installed_at_version?
  • version_for

Examples

log "Using `mongo` at `#{which('mongo')}`"

if installed?('apt')
  execute 'apt-get update'
end

execute 'install[thing]' do
  command "... 2>&1 #{dev_null}"
  not_if  { installed_at_version?('thing', node['thing']['version']) }
end

log "Skipping git install, version is at #{version_for('mongo', '-v')}"

Vagrant

  • vagrant?

Examples

http_request 'http://...' do
  not_if { vagrant? }
end

Filters

  • compile_time - accepts a block of resources to run at compile time
  • before - insert resource in the collection before the given resource
  • after - insert resource in the collection after the given resource

Examples

compile_time do
  package 'apache2'
end

# This is equivalent to
package 'apache2' do
  action :nothing
end.run_action(:install)

before 'service[apache2]' do
  log 'I am before the apache 2 service fires!'
end

after 'service[apache2]' do
  log 'I am after the apache 2 service fires!'
end

License & Authors

Copyright 2013 Seth Vargo

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.