Rebasing

integration/dockerfiles/Dockerfile_test_cache_install

@@ -17,4 +17,7 @@
 # if the cache is implemented correctly
 
 FROM gcr.io/google-appengine/debian9@sha256:1d6a9a6d106bd795098f60f4abb7083626354fa6735e81743c7f8cfca11259f0
+WORKDIR /foo
 RUN apt-get update && apt-get install -y make
+COPY context/bar /context
+RUN echo "hey" > foo

integration/dockerfiles/Dockerfile_test_meta_arg

@@ -0,0 +1,17 @@
+ARG REGISTRY=gcr.io
+ARG REPO=google-appengine
+ARG WORD=hello
+ARG W0RD2=hey
+
+FROM ${REGISTRY}/${REPO}/debian9 as stage1
+
+# Should evaluate WORD and create /tmp/hello
+ARG WORD
+RUN touch /${WORD}
+
+FROM ${REGISTRY}/${REPO}/debian9
+
+COPY --from=stage1 /hello /tmp
+
+# /tmp/hey should not get created without the ARG statement
+RUN touch /tmp/${WORD2}