Woorank/chef-awscli — pull request #6 by ajohnstone (2014-07-04 15:18:20+00:00)
Title: Check if aws access_key is provided.

Check if access_key is provided otherwise don't write config file.
Keys not provided when using AWS IAM roles.

http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/iam-roles-for-amazon-ec2.html