a dockerfile makefile experiemtn

Makefile

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DOCKER_IDENTITY_FILE = .docker-identity

# this makes a list of all the "docker directories" eg: image1 image2
docker_images := $(shell find . -maxdepth 2 -mindepth 2 -type f -name Dockerfile | xargs -L1 dirname | xargs -L1 basename )

# this makes a list of image1/Dockerfile image2/Docerfile
docker_files := $(docker_images:%=%/Dockerfile)

# this makes a list of image1/.docker-identity image2/.docker-identity
docker_identities := $(docker_files:%Dockerfile=%$(DOCKER_IDENTITY_FILE))

$(docker_images): $(docker_identities)

%/$(DOCKER_IDENTITY_FILE): %/Dockerfile
        $(info :: Creating docker $<)
        @imagename=$(shell dirname $<) ; \
        (cd $$imagename && docker build -t $$imagename .) && \
        docker inspect -f '{{.Id}}' $$imagename > $$imagename/$(DOCKER_IDENTITY_FILE)

.PHONY: $(docker_images) clean all

all     : build

build   : $(docker_images)

clean:
        find . -type f -name $(DOCKER_IDENTITY_FILE) -exec rm {} \;