New cross compilation script. Packages everything for a github release.

Add -version print that is set during build script compilation.

.gitignore

@@ -1,4 +1,5 @@
+
+bin
+
 prometheus_varnish_exporter
 prometheus_varnish_exporter.exe
-build/
-.idea/

build.sh

@@ -0,0 +1,48 @@
+#!/bin/bash
+
+set -e
+
+rm -rf bin
+mkdir -p bin/release
+
+VERSION="1.0"
+VERSION_HASH="$(git rev-parse --short HEAD)"
+VERSION_DATE="$(date -u '+%d.%m.%Y %H:%M:%S')"
+
+for goos in linux darwin windows freebsd openbsd netbsd ; do
+    for goarch in amd64 386; do
+        # path
+        outdir="bin/$goos/$goarch"
+        path="$outdir/prometheus_varnish_exporter"
+        if [ $goos = windows ] ; then
+            path=$path.exe
+        fi
+
+        # build
+        echo -e "\nBuilding $goos/$goarch"
+        GOOS=$goos GOARCH=$goarch go build -o $path -ldflags "-X 'main.Version=$VERSION' -X 'main.VersionHash=$VERSION_HASH' -X 'main.VersionDate=$VERSION_DATE'"
+        echo "  > `du -hc $path | awk 'NR==1{print $1;}'`    `file $path`"
+
+        # compress (for unique filenames to github release files)
+        if [ $goos = windows ] ; then
+            zip -rjX ./bin/release/$goos-$goarch.zip ./$outdir/ > /dev/null 2>&1
+        else
+            tar -C ./$outdir/ -cvzf ./bin/release/$goos-$goarch.tar.gz . > /dev/null 2>&1
+        fi
+    done
+done
+
+go env > .goenv
+source .goenv
+rm .goenv
+
+echo -e "\nRelease done: $(./bin/$GOOS/$GOARCH/prometheus_varnish_exporter --version)"
+for goos in linux darwin windows freebsd openbsd netbsd ; do
+    for goarch in amd64 386; do
+        path=bin/release/$goos-$goarch.tar.gz
+        if [ $goos = windows ] ; then
+            path=bin/release/$goos-$goarch.zip
+        fi
+        echo "  > `du -hc $path | awk 'NR==1{print $1;}'`    $path"
+    done
+done

main.go

@@ -3,6 +3,7 @@ package main
 import (
 	"encoding/json"
 	"flag"
+	"fmt"
 	"log"
 	"net/http"
 	"os"
@@ -12,6 +13,11 @@ import (
 )
 
 var (
+	ApplicationName = "prometheus_varnish_exporter"
+	Version         string
+	VersionHash     string
+	VersionDate     string
+
 	PrometheusExporter = NewPrometheusExporter()
 	VarnishVersion     = NewVarnishVersion()
 
@@ -63,12 +69,19 @@ func init() {
 	flag.StringVar(&StartParams.Params.VSM, "N", StartParams.Params.VSM, "varnishstat -N value.")
 
 	// modes
+	version := false
+	flag.BoolVar(&version, "version", version, "Print version and exit")
 	flag.BoolVar(&StartParams.Verbose, "verbose", StartParams.Verbose, "Verbose logging.")
 	flag.BoolVar(&StartParams.Test, "test", StartParams.Test, "Test varnishstat availability, prints available metrics and exits.")
 	flag.BoolVar(&StartParams.Raw, "raw", StartParams.Test, "Raw stdout logging without timestamps.")
 
 	flag.Parse()
 
+	if version {
+		fmt.Printf("%s %s\n", ApplicationName, getVersion(true))
+		os.Exit(0)
+	}
+
 	logger = log.New(os.Stdout, "", log.Ldate|log.Ltime)
 
 	if len(StartParams.Path) == 0 || StartParams.Path[0] != '/' {
@@ -78,7 +91,7 @@ func init() {
 
 func main() {
 	if b, err := json.MarshalIndent(StartParams, "", "  "); err == nil {
-		logInfo("Starting up %s", b)
+		logInfo("%s %s %s", ApplicationName, getVersion(false), b)
 	} else {
 		logFatal(err.Error())
 	}
@@ -132,3 +145,14 @@ func main() {
 	http.Handle(StartParams.Path, prometheus.Handler())
 	logFatalError(http.ListenAndServe(StartParams.ListenAddress, nil))
 }
+
+func getVersion(date bool) (version string) {
+	if Version == "" {
+		return "dev"
+	}
+	version = fmt.Sprintf("v%s (%s)", Version, VersionHash)
+	if date {
+		version += " " + VersionDate
+	}
+	return version
+}