[chef] Accessing Knife via Ruby

[Zuhaib Siddique < >]

Hey,

So I am writing a ruby script that will help with our deployments and as part 
of that I am leveraging the Chef REST API which is great but with some of 
that information I want to be able to pass that over to knife to do deletes.  
An example code is the following:

require 'chef/knife/ec2_server_delete'
  delete_ec2 = Chef::Knife::Ec2ServerDelete.new()
  delete_ec2.name_args = node.ec2.instance_id
  delete_ec2.run

This works but I get the following error: 

ERROR: You did not provided a valid 'AWS Access Key Id' value.
ERROR: You did not provided a valid 'AWS Secret Access Key' value.

But both are set and work correctly from the command line.  Also If I do this 
using the knife exec command it works.  I assume I am missing something in my 
ruby but I am just pulling a blank and can't seem to find any hints from 
looking at the chef/knife source code.  Any pointers would be great.

Thanks
Zuhaib