Dockerfile stored in image matedata

dockerfile_in_image_metadata_example.sh

#!/bin/bash
# Author: Ruslan Lutsenko 2016-02-03
# Build docker image with Dockerfile being stored as image metadata using labels

#check necessary utils
which jq|| { echo "Error: missing jq"; exit 1; }
which base64|| { echo "Error: missing base64"; exit 1; }

#example Dockerfile with LABEL being set 
cat << EOF > Dockerfile
FROM ubuntu:14.04
ARG base64_dockerfile=""
LABEL dockerfile=\$base64_dockerfile
EOF

#encode Dockerfile in Base64 so it safe to pass it as a label
base64_dockerfile=$(cat Dockerfile |base64 -w0)

# build image with dockerfile content being passed as an argument
docker build --rm -t my_image_with_dockerfile_in_metadata -f Dockerfile --build-arg base64_dockerfile=${base64_dockerfile} .

#remove temporary dockerfile
rm Dockerfile

echo "Dockerfile extracted from image metadata:"
docker inspect -f "{{json .Config.Labels }}" my_image_with_dockerfile_in_metadata| jq -r .dockerfile| base64 -d