Accessing knife.rb configuration from a Ruby script (eg. a Rakefile)

accessing_knife_rb_config_from_script.rb

require 'fog'
require 'chef/config'

Chef::Config.from_file('./.chef/knife.rb')
EC2 = Fog::Compute.new provider:              'AWS',
                       region:                Chef::Config[:knife][:region],
                       aws_access_key_id:     Chef::Config[:knife][:aws_access_key_id],
                       aws_secret_access_key: Chef::Config[:knife][:aws_secret_access_key]

servers = EC2.servers.select { |s| s.tags["Name"] =~ /ec2\-test\-/ && s.state == "running" }

# ...