Merge pull request #129 from cherrycl/issue-128

Reduce the compose image size

Dockerfile

@@ -2,6 +2,7 @@ ARG DOCKER_VERSION=19.03.5
 ARG PYTHON_VERSION=3.7.5
 ARG BUILD_ALPINE_VERSION=3.10
 ARG RUNTIME_ALPINE_VERSION=3.10.3
+ARG COMPOSE_TAG=1.25.4
 
 FROM docker:${DOCKER_VERSION} AS docker-cli
 
@@ -26,31 +27,28 @@ RUN apk add --no-cache \
     zlib-dev
 ENV BUILD_BOOTLOADER=1
 
-WORKDIR /usr/local/src
-
-ARG COMPOSE_TAG=1.25.4
-
-RUN git clone --branch ${COMPOSE_TAG} --quiet --recurse-submodules https://github.com/docker/compose.git
-
 COPY --from=docker-cli /usr/local/bin/docker /usr/local/bin/docker
 
 WORKDIR /code/
+
+ARG COMPOSE_TAG
+RUN git clone --branch ${COMPOSE_TAG} --quiet --recurse-submodules https://github.com/docker/compose.git .
+
 # FIXME(chris-crone): virtualenv 16.3.0 breaks build, force 16.2.0 until fixed
 RUN pip install virtualenv==16.2.0
 RUN pip install tox==2.9.1
 
-RUN cp /usr/local/src/compose/requirements.txt .
-RUN cp /usr/local/src/compose/requirements-dev.txt .
-RUN cp /usr/local/src/compose/.pre-commit-config.yaml .
-RUN cp /usr/local/src/compose/tox.ini .
-RUN cp /usr/local/src/compose/setup.py .
-RUN cp /usr/local/src/compose/README.md .
-RUN cp -r /usr/local/src/compose/compose compose/
 RUN tox --notest
-RUN cp -r /usr/local/src/compose/* .
 ARG GIT_COMMIT=unknown
 ENV DOCKER_COMPOSE_GITSHA=$GIT_COMMIT
 RUN script/build/linux-entrypoint
+RUN cp docker-compose-entrypoint.sh /usr/local/bin/
+ENTRYPOINT ["sh", "/usr/local/bin/docker-compose-entrypoint.sh"]
 
-RUN cp /usr/local/src/compose/docker-compose-entrypoint.sh /usr/local/bin/
+FROM alpine:${RUNTIME_ALPINE_VERSION} AS runtime
+ARG COMPOSE_TAG
+RUN wget https://raw.githubusercontent.com/docker/compose/${COMPOSE_TAG}/docker-compose-entrypoint.sh
+RUN cp docker-compose-entrypoint.sh /usr/local/bin/
 ENTRYPOINT ["sh", "/usr/local/bin/docker-compose-entrypoint.sh"]
+COPY --from=docker-cli  /usr/local/bin/docker           /usr/local/bin/docker
+COPY --from=build       /usr/local/bin/docker-compose   /usr/local/bin/docker-compose