I've cloned the repo and ran:
terraform plan
get the following error message:
There are warnings and/or errors related to your configuration. Please
fix these before continuing.
Errors:
* null_resource.chef_chef-server: Error parsing attributes_json: invalid character 'D' after top-level value
terraform --version
Terraform v0.8.2
on OSX 10.11.6
Saw your issue logged at terraform hashicorp/terraform#10788
Solve this by downloading and using 0.7.13