Added Version information in the build

Author: pierresouchay

.travis.yml

@@ -2,7 +2,7 @@ language: go
 go:
 - 1.x
 script:
-- go build -o haproxy-connect
+- go build -o haproxy-connect -ldflags "-X main.BuildTime=`date -u '+%Y-%m-%dT%H:%M:%SZ'` -X main.GitHash=`git rev-parse HEAD` -X main.Version=${TRAVIS_TAG:-Dev}"
 sudo: false
 before_deploy:
 - echo "Deploying $TRAVIS_TAG to GitHub releases"

GNUmakefile

@@ -0,0 +1,12 @@
+BIN := haproxy-connect
+SOURCES := $(shell find . -name '*.go')
+
+all: test bin
+
+$(BIN): $(SOURCES)
+	go build -o haproxy-connect -ldflags "-X main.BuildTime=`date -u '+%Y-%m-%dT%H:%M:%SZ'` -X main.GitHash=`git rev-parse HEAD` -X main.Version=$${TRAVIS_TAG:-Dev}"
+
+bin: $(BIN)
+
+test:
+	go test -v -timeout 30s ${gobuild_args} ./...

main.go

@@ -2,6 +2,8 @@ package main
 
 import (
 	"flag"
+	"fmt"
+	"os"
 	"strings"
 
 	log "github.com/sirupsen/logrus"
@@ -14,6 +16,15 @@ import (
 	"github.com/criteo/haproxy-consul-connect/consul"
 )
 
+// Version is set by Travis build
+var Version string = "v0.1.9-Dev"
+
+// BuildTime is set by Travis
+var BuildTime string = "2020-01-01T00:00:00Z"
+
+// GitHash The last reference Hash from Git
+var GitHash string = "unknown"
+
 type consulLogger struct{}
 
 // Debugf Display debug message
@@ -37,6 +48,7 @@ func (consulLogger) Errorf(format string, args ...interface{}) {
 }
 
 func main() {
+	versionFlag := flag.Bool("version", false, "Show version and exit")
 	logLevel := flag.String("log-level", "INFO", "Log level")
 	consulAddr := flag.String("http-addr", "127.0.0.1:8500", "Consul agent address")
 	service := flag.String("sidecar-for", "", "The consul service id to proxy")
@@ -50,6 +62,11 @@ func main() {
 	token := flag.String("token", "", "Consul ACL token")
 	flag.Parse()
 
+	if versionFlag != nil && *versionFlag {
+		fmt.Printf("Version: %s ; BuildTime: %s ; GitHash: %s\n", Version, BuildTime, GitHash)
+		os.Exit(0)
+	}
+
 	ll, err := log.ParseLevel(*logLevel)
 	if err != nil {
 		log.Fatal(err)