Pull config info for a script from a chef data bag (So your script runs via "knife exec" without embedding config info in it)

awscreds_from_databag.rb

#This is meant to be run via "knife exec scriptname.rb"
#
require 'fog'
#Make sure you have a data bag called admin/ec2creds containing values 'aws_access_key_id' and 'aws_secret_access_key'
#which point to your AWS access key and secret access key.
DBAG_NAME='admin'
DBAG_KEY='ec2creds'
#Pull AWS credentials from the databag 'admin' with key 'ec2creds'
aws=Chef::DataBagItem.load(DBAG_NAME,DBAG_KEY)

fogobj = Fog::Compute.new(
    :provider => 'AWS',
    :region => 'us-east-1',
    :aws_access_key_id => aws['aws_access_key_id'],
    :aws_secret_access_key => aws['aws_secret_access_key']
)

#This script is just to illustrate how to pull values from a chef data bag into a local script 
#All it does is to emulate the stock 'ec2-describe-regions' command.
fogobj.describe_regions.body['regionInfo'].each do |x|
  puts "REGION #{x['regionName']} => #{x['regionEndpoint']}"
end