Merge branch 'add_show_version' into 'master'

Add version flag.

It is handy to have only the version with revision printed out.

Also useful for omnibus-gitlab#1213

See merge request !5

404.go

 package main
 import (
-	"net/http"
 	"fmt"
+	"net/http"
 )
 const predefined404 = `

Makefile

@@ -27,8 +27,7 @@ fmt:
 	go fmt ./... | awk '{ print "Please run go fmt"; exit 1 }'
 vet:
-	go get golang.org/x/tools/cmd/vet
-	go vet
+	go tool vet *.go
 lint:
 	go get github.com/golang/lint/golint

domain_test.go

@@ -2,12 +2,12 @@ package main
 import (
 	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+	"mime"
 	"net/http"
+	"net/http/httptest"
 	"net/url"
 	"testing"
-	"net/http/httptest"
-	"github.com/stretchr/testify/require"
-	"mime"
 )
 func TestGroupServeHTTP(t *testing.T) {

main.go

@@ -15,6 +15,7 @@ var VERSION = "dev"
 var REVISION = "HEAD"
 func appMain() {
+	var showVersion = flag.Bool("version", false, "Show version")
 	var listenHTTP = flag.String("listen-http", "", "The address to listen for HTTP requests")
 	var listenHTTPS = flag.String("listen-https", "", "The address to listen for HTTPS requests")
 	var listenProxy = flag.String("listen-proxy", "", "The address to listen for proxy requests")
@@ -27,9 +28,12 @@ func appMain() {
 	var daemonUID = flag.Uint("daemon-uid", 0, "Drop privileges to this user")
 	var daemonGID = flag.Uint("daemon-gid", 0, "Drop privileges to this group")
+	flag.Parse()
+
+	printVersion(*showVersion, VERSION)
+
 	log.Printf("GitLab Pages Daemon %s (%s)", VERSION, REVISION)
 	log.Printf("URL: https://gitlab.com/gitlab-org/gitlab-pages\n")
-	flag.Parse()
 	err := os.Chdir(*pagesRoot)
 	if err != nil {
@@ -75,6 +79,14 @@ func appMain() {
 	runApp(config)
 }
+func printVersion(showVersion bool, version string) {
+	if showVersion {
+		log.SetFlags(0)
+		log.Printf(version)
+		os.Exit(0)
+	}
+}
+
 func main() {
 	log.SetOutput(os.Stderr)