Add dockerize script for building slim docker image (#20)

* Add dockerize script for building slim docker image

* Use full path to executable

Author: klingerf

.dockerignore

@@ -1,12 +1,5 @@
-FROM jimmycuadra/rust:1.16.0
+FROM debian:jessie-slim
 
-RUN mkdir -p /rust/app
-WORKDIR /rust/app
-
-ENV TARGET=x86_64-unknown-linux-gnu
-
-COPY . /rust/app
-RUN cargo build --release --target=$TARGET
-RUN cp ./target/$TARGET/release/linkerd-tcp /usr/local/bin
+COPY ./target/x86_64-unknown-linux-gnu/release/linkerd-tcp /usr/local/bin/
 
 ENTRYPOINT ["/usr/local/bin/linkerd-tcp"]

Dockerfile

@@ -89,10 +89,10 @@ debugging, set `RUST_LOG=trace`.
 To build the linkerd/linkerd-tcp docker image, run:
 
 ```bash
-docker build -t linkerd/linkerd-tcp:latest .
+./dockerize latest
 ```
 
-Replace the `latest` tag with the version that you want to build.
+Replace `latest` with the version that you want to build.
 
 Try running the image with:
 

README.md

@@ -0,0 +1,13 @@
+#!/bin/sh
+
+set -e
+
+if [ -z "$1" ]; then
+  echo "usage: dockerize <tag>" >&2
+  exit 1
+fi
+
+docker run --rm -v `pwd`:/rust/app -w /rust/app jimmycuadra/rust:1.16.0 cargo build --release --target=x86_64-unknown-linux-gnu
+docker build -t linkerd/linkerd-tcp:$1 .
+
+echo "Created linkerd/linkerd-tcp:$1"