removed VERSION

Dockerfile

@@ -1,12 +1,7 @@
 FROM golang:1.16.2 AS builder
 WORKDIR /go/src/github.com/gliderlabs/registrator/
 COPY . .
-RUN \
-	CGO_ENABLED=0 GOOS=linux go build \
-		-a -installsuffix cgo \
-		-ldflags "-X main.Version=$(cat VERSION)" \
-		-o bin/registrator \
-		.
+RUN go build -o bin/registrator .
 
 FROM scratch
 COPY --from=builder /go/src/github.com/gliderlabs/registrator/bin/registrator /bin/registrator

registrator.go

@@ -13,14 +13,9 @@ import (
 
 	"github.com/docker/docker/api/types/swarm"
 	dockerapi "github.com/fsouza/go-dockerclient"
-	"github.com/gliderlabs/pkg/usage"
 	"github.com/gliderlabs/registrator/bridge"
 )
 
-var Version string
-
-var versionChecker = usage.NewChecker("registrator", Version)
-
 var hostIp = flag.String("ip", "", "IP for ports mapped to the host")
 var internal = flag.Bool("internal", false, "Use internal ports instead of published ones")
 var explicit = flag.Bool("explicit", false, "Only register services which have SERVICE_NAME label set")
@@ -50,12 +45,6 @@ func assert(err error) {
 }
 
 func main() {
-	if len(os.Args) == 2 && os.Args[1] == "--version" {
-		versionChecker.PrintVersion()
-		os.Exit(0)
-	}
-	log.Printf("Starting registrator %s ...", Version)
-
 	flag.Usage = func() {
 		fmt.Fprintf(os.Stderr, "Usage of %s:\n", os.Args[0])
 		fmt.Fprintf(os.Stderr, "  %s [options] <registry URI>\n\n", os.Args[0])