CI improvements (#1)

This PR contains:
* Automatic version detection by using git tags
* Fix for the Makefile (double package target)
* Enable Travis CI to build the Docker images and push to Docker Hub

.travis.yml

@@ -1,2 +1,16 @@
 language: go
-script: make test
+
+services:
+  - docker
+
+script: 
+  - make test
+
+after_success:
+  - echo $DOCKER_PASSWORD | docker login -u $DOCKER_USER --password-stdin
+  - export REPO=$DOCKER_USER/tile38
+  - export COMMIT_SHORT=$(git rev-parse --short HEAD)
+  - docker build -f docker/Dockerfile -t $REPO:$COMMIT_SHORT .
+  - export TAG=`if [ ! -z "$TRAVIS_TAG" ]; then echo $TRAVIS_TAG; elif [ "$TRAVIS_BRANCH" == "master" ]; then echo "edge"; else echo ""; fi`
+  - if [[ ! -z "$TAG" && "$TRAVIS_BRANCH" == "master" && "$TRAVIS_PULL_REQUEST" == "false" ]]; then docker tag $REPO:$COMMIT_SHORT $REPO:$TAG && docker push $REPO:$TAG && echo "Pushed $REPO:$TAG"; else echo "Not pushing, either not on master or on a PR"; fi
+  - if [[ ! -z "$TRAVIS_TAG" ]]; then docker tag $REPO:$COMMIT_SHORT $REPO:latest && docker push $REPO:latest && echo "Pushed $REPO:latest"; else echo "Not pushing, no tag"; fi

Makefile

@@ -17,6 +17,5 @@ uninstall:
 	rm -f /usr/local/bin/tile38-server
 	rm -f /usr/local/bin/tile38-cli
 	rm -f /usr/local/bin/tile38-benchmark
-package:
 package:
 	@./build.sh package

build.sh

@@ -1,7 +1,7 @@
 #!/bin/bash
 set -e
 
-VERSION="1.12.0"
+VERSION=$(git describe --tags | sed 's/-/\n/g' | head -n 1)
 PROTECTED_MODE="no"
 
 # Hardcode some values to the core package
@@ -120,7 +120,6 @@ function rmtemp {
 }
 trap rmtemp EXIT
 
-
 if [ "$NOLINK" != "1" ]; then
     # symlink root to isolated directory
 	mkdir -p "$TMP/go/src/github.com/tidwall"

docker/Dockerfile

@@ -1,25 +1,13 @@
 FROM alpine:3.4
 
-ENV TILE38_VERSION 1.12.0
-ENV TILE38_DOWNLOAD_URL https://github.com/tidwall/tile38/releases/download/$TILE38_VERSION/tile38-$TILE38_VERSION-linux-amd64.tar.gz
+ADD ./tile38-server /usr/local/bin
+ADD ./tile38-cli /usr/local/bin
 
-RUN addgroup -S tile38 && adduser -S -G tile38 tile38
-
-RUN apk update \
-    && apk add ca-certificates \
-    && update-ca-certificates \
-    && apk add openssl \
-    && wget -O tile38.tar.gz "$TILE38_DOWNLOAD_URL" \
-    && tar -xzvf tile38.tar.gz \
-    && rm -f tile38.tar.gz \
-    && mv tile38-$TILE38_VERSION-linux-amd64/tile38-server /usr/local/bin \
-    && mv tile38-$TILE38_VERSION-linux-amd64/tile38-cli /usr/local/bin \
-    && rm -fR tile38-$TILE38_VERSION-linux-amd64
-
-RUN mkdir /data && chown tile38:tile38 /data
+RUN addgroup -S tile38 && \
+    adduser -S -G tile38 tile38 && \
+    mkdir /data && chown tile38:tile38 /data
 
 VOLUME /data
-WORKDIR /data
 
 EXPOSE 9851
-CMD ["tile38-server"]
+CMD ["tile38-server", "-d", "/data"]