Add a resource for managing the motd

[tas50]

Core Chef Resource Checklist

Before suggesting a resource for inclusion please make sure your suggestion meets these criteria for resources built into Chef:

• Automates an operating system component that ships by default on systems such as authentication, raid, disk partitions, firewalls, containers, or virtualization systems.
• Does not attempt automate 3rd party applications such as database, web, or application servers, which are best suited for cookbooks due to their fast moving nature.

Describe the resource:

A resource that would allow you to set the content of the system's MTOD

Why should this be included out of the box?:

A lot of organizations want to set a security warning here and we should make that super simple.

What operating systems would it run on?

Linux at least

[devopsdina]

@tas50 I think there are two potential used cases for motd.

1. Providing the content inline with the resource for the motd (give a simple motd)
2. Providing a path to a file or template with the content for the motd (complex motd)

Example of providing a simple motd

motd 'message name' do
  content "This is a secure system. blah blah blah"
  action :create # default action; other action :delete
end

Example of providing a source for a more complex motd

motd 'message name' do
  provide_source true # set to true to pass template/file (defaults to false)
  cookbook 'current_cookbook' # defaults to current cookbook
  source 'path/to/template.erb'
  action :create # default action; other action :delete
end

[devopsdina]

@tas50 simple motd resource functional for linux + windows: https://github.com/devopsdina/motd

Just need help moving this into core!

[tas50]

You should be able to skip the provide_source bit and just use the source if a source is set. Other than that the design in the docs here lookos good to me.

[devopsdina]

@tas50 Simple and Complex motd should be working now: https://github.com/devopsdina/motd

Tested with the latest chef client (16.2), with the new resource changes https://docs.chef.io/release_notes/#breaking-change-in-resources, and backwards down to chef 14