Add version command

Dockerfile

@@ -8,7 +8,7 @@ ENV GOFLAGS="-mod=vendor" \
 
 RUN go generate && \
 	CGO_ENABLED=0 go build -v \
-	-ldflags "-X ${VERSION_PACKAGE}.VersionName=`git describe --tags --abbrev=0 --exact-match || git symbolic-ref -q --short HEAD` -X ${VERSION_PACKAGE}.BuildName=`git rev-parse --short HEAD`" \
+	-ldflags "-X ${VERSION_PACKAGE}.VersionName=`git describe --tags --abbrev=0 --exact-match || git symbolic-ref -q --short HEAD` -X ${VERSION_PACKAGE}.BuildName=`git rev-parse --short HEAD` -X ${VERSION_PACKAGE}.BuildDate=`date +'%F'`" \
 	-o /couper main.go && \
 	ls -lh /couper
 

command/cmd.go

@@ -18,6 +18,8 @@ func NewCommand(cmd string) Cmd {
 	switch strings.ToLower(cmd) {
 	case "run":
 		return NewRun(ContextWithSignal(context.Background()))
+	case "version":
+		return NewVersion()
 	default:
 		return nil
 	}

command/version.go

@@ -0,0 +1,25 @@
+package command
+
+import (
+	"github.com/sirupsen/logrus"
+
+	"github.com/avenga/couper/config"
+	"github.com/avenga/couper/config/runtime"
+)
+
+var _ Cmd = &Version{}
+
+type Version struct{}
+
+func NewVersion() *Version {
+	return &Version{}
+}
+
+func (v Version) Execute(_ Args, _ *config.CouperFile, _ *logrus.Entry) error {
+	println(runtime.VersionName + " " + runtime.BuildDate + " " + runtime.BuildName)
+	return nil
+}
+
+func (v Version) Usage() string {
+	return "couper version"
+}

config/runtime/version.go

@@ -1,6 +1,9 @@
 package runtime
 
+import "time"
+
 var (
+	BuildDate   = time.Now().Format("2006-01-02")
 	BuildName   = "dev"
 	VersionName = "0"
 )

main.go

@@ -40,6 +40,11 @@ func realmain(arguments []string) int {
 	cmd := args[0]
 	args = args[1:]
 
+	if cmd == "version" { // global options are not required, fast exit.
+		_ = command.NewCommand(cmd).Execute(args, nil, nil)
+		return 0
+	}
+
 	var filePath, logFormat string
 	set := flag.NewFlagSet("global", flag.ContinueOnError)
 	set.StringVar(&filePath, "f", config.DefaultFileName, "-f ./couper.hcl")