Slim down the image

Don't package test deps, tests and a few other support files.

Author: pointlessone

.dockerignore

@@ -1 +1,6 @@
-.git
+.*
+Makefile
+Dockerfile
+README.md
+spec
+circle.yml

Dockerfile

@@ -1,19 +1,23 @@
 FROM ruby:2.4-alpine
 LABEL maintainer="Code Climate <[email protected]>"
 
-RUN apk --update add grep
-
 WORKDIR /usr/src/app
 
-COPY Gemfile* ./
-RUN gem install -g
-
 RUN adduser -u 9000 -D app
-RUN chown -R app:app /usr/src/app
-USER app
+
+RUN apk --no-cache add grep
+
+COPY Gemfile* ./
+RUN bundler install --no-cache --without=test --system && \
+  chown -R app:app /usr/local/bundle && \
+  rm -r ~/.bundle
 
 COPY . ./
 
+RUN chown -R app:app . && \
+  ln engine.json /
+
+USER app
 VOLUME /code
 WORKDIR /code
 

Dockerfile.test

@@ -0,0 +1,7 @@
+FROM codeclimate/codeclimate-grep
+
+WORKDIR /usr/src/app
+
+RUN bundler install --no-cache --with=test --system && \
+  chown -R app:app /usr/local/bundle && \
+  rm -r ~/.bundle

Makefile

@@ -3,7 +3,13 @@
 IMAGE_NAME ?= codeclimate/codeclimate-grep
 
 image:
-	docker build --rm -t $(IMAGE_NAME) .
+	docker build --tag $(IMAGE_NAME) .
 
-test: image
-	docker run --rm --workdir /usr/src/app $(IMAGE_NAME) sh -c "rspec"
+test-image: image
+	docker build --tag $(IMAGE_NAME)-test --file Dockerfile.test .
+
+test: test-image
+	docker run --rm \
+		--volume $(PWD)/spec:/usr/src/app/spec \
+		$(IMAGE_NAME)-test \
+		sh -c "bundle exec rspec"

circle.yml

@@ -12,7 +12,7 @@ dependencies:
       --env GCR_JSON_KEY
       --volume /var/run/docker.sock:/var/run/docker.sock
       codeclimate/patrick pull || true
-    - make image
+    - make test-image
 
 test:
   override:

engine.json

@@ -6,6 +6,6 @@
     "email": "[email protected]"
   },
   "languages" : ["*"],
-  "version": "0.1",
+  "version": "0.1.1",
   "spec_version": "0.3.1"
 }