Improve docker image size with a 2 stages image (paritytech#463)

* Improve docker image size with a 2 stages image

* Minor doc updates

* Fix and reduce size of the docker image

* Fix paths in scripts

.dockerignore

@@ -0,0 +1,2 @@
+doc
+target

Dockerfile

@@ -0,0 +1,38 @@
+FROM phusion/baseimage:0.10.1 as builder
+LABEL maintainer "chevdor@gmail.com"
+LABEL description="This is the build stage for Polkadot. Here we create the binary."
+
+ARG PROFILE=release
+WORKDIR /polkadot
+
+COPY . /polkadot
+
+RUN apt-get update && \
+	apt-get upgrade -y && \
+	apt-get install -y cmake pkg-config libssl-dev git
+
+RUN curl https://sh.rustup.rs -sSf | sh -s -- -y && \
+	export PATH=$PATH:$HOME/.cargo/bin && \
+	cargo build --$PROFILE
+
+# ===== SECOND STAGE ======
+
+FROM phusion/baseimage:0.10.0
+LABEL maintainer "chevdor@gmail.com"
+LABEL description="This is the 2nd stage: a very small image where we copy the Polkadot binary."
+ARG PROFILE=release
+COPY --from=builder /polkadot/target/$PROFILE/polkadot /usr/local/bin
+
+RUN mv /usr/share/ca* /tmp && \
+	rm -rf /usr/share/*  && \
+	mv /tmp/ca-certificates /usr/share/ && \
+	rm -rf /usr/lib/python* && \
+	mkdir -p /root/.local/share/Polkadot && \
+	ln -s /root/.local/share/Polkadot /data
+
+RUN	rm -rf /usr/bin /usr/sbin
+
+EXPOSE 30333 9933 9944
+VOLUME ["/data"]
+
+CMD ["/usr/local/bin/polkadot"]

README.adoc

@@ -92,7 +92,7 @@ Then build the code:
 
 [source, shell]
 ----
-./build.sh  # Builds the WebAssembly binaries
+./scripts/build.sh  # Builds the WebAssembly binaries
 cargo build # Builds all native code
 ----
 
@@ -118,7 +118,7 @@ The easiest/faster option is to use the latest image.
 Let´s first check the version we have. The first time you run this command, the polkadot docker image will be downloaded. This takes a bit of time and bandwidth, be patient:
 
 [source, shell]
-docker run --rm -it chevdor/polkadot:latest ./version
+docker run --rm -it chevdor/polkadot:latest pokadot --version
 
 
 .Polkadot arguments
@@ -149,8 +149,7 @@ You can either build it yourself (it takes a while...):
 
 [source, shell]
 ----
-cd docker
-./build.sh
+./docker/build.sh
 ----
 
 === Reporting issues
@@ -159,7 +158,7 @@ If you run into issues with polkadot when using docker, please run the following
 (replace the tag with the appropriate one if you do not use latest):
 
 [source, shell]
-docker run --rm -it chevdor/polkadot:latest version
+docker run --rm -it chevdor/polkadot:latest polkadot --version
 
 This will show you the polkadot version as well as the git commit ref that was used to build your container.
 Just paste that in the issue you create.

ci/script.sh

@@ -22,7 +22,8 @@ case $TARGET in
 
 	"wasm")
 		# Install prerequisites and build all wasm projects
-		./init.sh
-		./build.sh
+		./scripts/init.sh
+		./scripts/build.sh
+		./scripts/build-demos.sh
 		;;
 esac

docker/build.sh

@@ -1,18 +1,26 @@
 #!/usr/bin/env bash
 set -e
 
+pushd .
+
+# The following line ensure we run from the project root
+PROJECT_ROOT=`git rev-parse --show-toplevel`
+cd $PROJECT_ROOT
+
 # Find the current version from Cargo.toml
-VERSION=`grep "^version" ../Cargo.toml | egrep -o "([0-9\.]+)"`
+VERSION=`grep "^version" ./Cargo.toml | egrep -o "([0-9\.]+)"`
 GITUSER=chevdor
 GITREPO=polkadot
 
 # Build the image
-echo "Building ${GITREPO}:$VERSION docker image, hang on!"
-time docker build --build-arg PROFILE=release -t ${GITUSER}/${GITREPO}:$VERSION .
+echo "Building ${GITUSER}/${GITREPO}:latest docker image, hang on!"
+time docker build -f ./docker/Dockerfile --build-arg PROFILE=release -t ${GITUSER}/${GITREPO}:latest .
 
 # Show the list of available images for this repo
 echo "Image is ready"
 docker images | grep ${GITREPO}
 
-echo -e "\nIf you just built the latest, you may want to update your tag:"
-echo " $ docker tag ${GITUSER}/${GITREPO}:$VERSION ${GITUSER}/${GITREPO}:latest"
+echo -e "\nIf you just built version ${VERSION}, you may want to update your tag:"
+echo " $ docker tag ${GITUSER}/${GITREPO}:$VERSION ${GITUSER}/${GITREPO}:${VERSION}"
+
+popd

docker/readme-docker.adoc

@@ -5,12 +5,12 @@
 
 Run the following command
 
-	docker run -d chevdor/polkadot:latest polkadot
+	docker run -d -P --name polkadot chevdor/polkadot:latest
 
 === Building the image
 
 To build your own image from the source, you can run the following command:
 
-	./build.sh
+	./docker/build.sh
 
 NOTE: Building the image takes a while. Count at least 30min on a good machine.

scripts/build-demos.sh

@@ -0,0 +1,28 @@
+#!/usr/bin/env bash
+
+# This script assumes that all pre-requisites are installed.
+
+set -e
+
+PROJECT_ROOT=`git rev-parse --show-toplevel`
+source `dirname "$0"`/common.sh
+
+export CARGO_INCREMENTAL=0
+
+# Save current directory.
+pushd .
+
+cd $ROOT
+
+for DEMO in "${DEMOS[@]}"
+do
+  echo "*** Building wasm binaries in $DEMO"
+  cd "$PROJECT_ROOT/$DEMO"
+
+  ./build.sh
+
+  cd - >> /dev/null
+done
+
+# Restore initial directory.
+popd

build.sh → scripts/build.sh

@@ -4,6 +4,7 @@
 
 set -e
 
+PROJECT_ROOT=`git rev-parse --show-toplevel`
 source `dirname "$0"`/common.sh
 
 export CARGO_INCREMENTAL=0
@@ -16,7 +17,7 @@ cd $ROOT
 for SRC in "${SRCS[@]}"
 do
   echo "*** Building wasm binaries in $SRC"
-  cd $SRC
+  cd "$PROJECT_ROOT/$SRC"
 
   ./build.sh
 

common.sh → scripts/common.sh

@@ -6,6 +6,9 @@ ROOT=`dirname "$0"`
 SRCS=(
 	"polkadot/runtime/wasm"
 	"substrate/executor/wasm"
+)
+
+DEMOS=(
 	"demo/runtime/wasm"
 	"substrate/test-runtime/wasm"
 	"polkadot/test-parachains/"

init.sh → scripts/init.sh

@@ -2,7 +2,7 @@
 
 set -e
 
-echo "*** Initilising WASM build environment"
+echo "*** Initialising WASM build environment"
 
 rustup update nightly
 rustup target add wasm32-unknown-unknown --toolchain nightly