anchor.diff:    /bin/terraform version
   
   # Install kubectl
  -ARG KUBECTL_VERSION='1.3.4'
  +ARG KUBECTL_VERSION='1.5.6'
   ADD https://storage.googleapis.com/kubernetes-release/release/v${KUBECTL_VERSION}/bin/linux/amd64/kubectl /bin/kubectl
   RUN chmod +x /bin/kubectl
   
   # Install stern
  -ARG STERN_VERSION='1.2.0'
  +ARG STERN_VERSION='1.4.0'
   ADD https://github.com/wercker/stern/releases/download/${STERN_VERSION}/stern_linux_amd64 /bin/stern
   RUN chmod +x /bin/stern
   
  
positive.code:   rm -f packer_${PACKER_VERSION}_linux_amd64.zip
  
  # Install terraform
  ARG TERRAFORM_VERSION='0.8.4'
  ADD https://releases.hashicorp.com/terraform/${TERRAFORM_VERSION}/terraform_${TERRAFORM_VERSION}_linux_amd64.zip ./
  ADD https://releases.hashicorp.com/terraform/${TERRAFORM_VERSION}/terraform_${TERRAFORM_VERSION}_SHA256SUMS ./
  
  
negative.code: FROM alpine:3.5
  
  # Install Packer
  ARG PACKER_VERSION='1.0.0'
  ADD https://releases.hashicorp.com/packer/${PACKER_VERSION}/packer_${PACKER_VERSION}_linux_amd64.zip ./
  ADD https://releases.hashicorp.com/packer/${PACKER_VERSION}/packer_${PACKER_VERSION}_SHA256SUMS ./
  
  