CODEWITHSUNDEEP
rubychef-infracookbook
asdoylejr
asdoylejr

Reputation: 694

How would I include and configure a ruby library in a Chef recipe?

I want to include the Diplomat gem in my Chef cookbook so that I can perform Consul variable lookups in .erb templates.

I need to configure the Consul URL:

irb(main):015:0> require 'diplomat'
irb(main):016:0> Diplomat.configure do |config|
irb(main):017:1*   config.url = "consulurl:80"
irb(main):018:1> end

Set a variable as the URL path:

irb(main):020:0> kv_path = "path/to/variable"
=> "path/to/variable"

And finally, perform the lookup within the templates.

irb(main):022:0> foo = Diplomat::Kv.get(kv_path + '/test_foo_123')
=> "bar"

Where in the cookbook would I need to write the configuration code above such that I can perform variable lookups within .erb templates?

Upvotes: 3

Views: 1135

Answers (2)

coderanger
coderanger

Reputation: 54249

You want to use the chef_gem resource, but make sure to run it during the compile phase:

chef_gem 'diplomat' do
  action :nothing
  compile_time false
end.run_action(:install)
require 'diplomat'

Upvotes: 2

iGallina
iGallina

Reputation: 610

Installing gems with Chef is relatively painless. Most of the time, you can use the gem_package resource, which behaves very similarly to the native package resource:

gem_package 'httparty'

You can even specify the gem version to install:

gem_package 'httparty' do version '0.12.0' end

You may have also seen the chef_gem resource. What's the difference?

The chef_gem and gem_package resources are both used to install Ruby gems. For any machine on which the chef-client is installed, there are two instances of Ruby. One is the standard, system-wide instance of Ruby and the other is a dedicated instance that is available only to the chef-client. Use the chef_gem resource to install gems into the instance of Ruby that is dedicated to the chef-client. Use the gem_package resource to install all other gems (i.e. install gems system-wide).

source: https://sethvargo.com/using-gems-with-chef/

Upvotes: 0

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