Add version endpoint and upx (#3)

* Add ident

* add build artifacts to gitignore

* Add upx to shrink binary

.gitattributes

@@ -0,0 +1 @@
+* ident

.gitignore

@@ -12,3 +12,7 @@ Session.vim
 *~
 # auto-generated tag files
 tags
+
+# build artifacts
+hello_world
+docker-hello-world

.travis.yml

@@ -3,5 +3,9 @@ go:
 - 1.8
 - 1.9
 - master
+addons:
+  apt:
+    packages:
+    - upx
 script:
 - make all

Dockerfile

@@ -3,8 +3,12 @@
 FROM golang:1.9.2 AS builder
 WORKDIR /go/src/github.com/infrastructure-as-code/docker-hello-world
 ENV GIN_MODE debug
+ENV DEBIAN_FRONTEND noninteractive
 COPY Makefile *.go ./
-RUN make all
+RUN apt-get update && \
+	apt-get upgrade -y && \
+	apt-get install -y upx && \
+	make all
 
 FROM scratch
 LABEL maintainer "Vince Tse <[email protected]>"

Makefile

@@ -1,5 +1,6 @@
 all: deps test
 	CGO_ENABLED=0 go build -a -o hello_world
+	upx --brute hello_world
 
 test:
 	GIN_MODE=debug go test

hello_world.go

@@ -19,6 +19,10 @@ func getHostname() string {
 	return name
 }
 
+func getVersion() string {
+	return "$Id$"
+}
+
 func helloFunc(c *gin.Context) {
 	c.Writer.Header().Set("X-Hostname", hostname)
 	c.String(http.StatusOK, "Hello, World!")
@@ -29,6 +33,11 @@ func healthFunc(c *gin.Context) {
 	c.String(http.StatusOK, "")
 }
 
+func versionFunc(c *gin.Context) {
+	c.Writer.Header().Set("X-Hostname", hostname)
+	c.String(http.StatusOK, getVersion())
+}
+
 func setupRouter(routePrefix string) *gin.Engine {
 	router := gin.Default()
 	ginprom := ginprometheus.NewPrometheus("gin")
@@ -37,6 +46,7 @@ func setupRouter(routePrefix string) *gin.Engine {
 
 	rg := router.Group(routePrefix)
 	rg.GET("/", helloFunc)
+	rg.GET("/version", versionFunc)
 	return router
 }