Ensure all binaries respond to -version

cmd/check/main.go

@@ -12,7 +12,21 @@ import (
 	"gitlab.com/gitlab-org/gitlab-shell/v14/internal/logger"
 )
 
+var (
+	// Version is the current version of gitlab-shell
+	Version = "(unknown version)" // Set at build time in the Makefile
+	// BuildTime signifies the time the binary was build
+	BuildTime = "19700101.000000" // Set at build time in the Makefile
+)
+
 func main() {
+	// We can't use the flag library because gitlab-shell receives other arguments
+	// that confuse the parser.
+	if len(os.Args) == 2 && os.Args[1] == "-version" {
+		fmt.Printf("check %s-%s\n", Version, BuildTime)
+		os.Exit(0)
+	}
+
 	readWriter := &readwriter.ReadWriter{
 		Out:    os.Stdout,
 		In:     os.Stdin,

cmd/gitlab-shell-authorized-keys-check/main.go

@@ -13,7 +13,21 @@ import (
 	"gitlab.com/gitlab-org/gitlab-shell/v14/internal/logger"
 )
 
+var (
+	// Version is the current version of gitlab-shell
+	Version = "(unknown version)" // Set at build time in the Makefile
+	// BuildTime signifies the time the binary was build
+	BuildTime = "19700101.000000" // Set at build time in the Makefile
+)
+
 func main() {
+	// We can't use the flag library because gitlab-shell receives other arguments
+	// that confuse the parser.
+	if len(os.Args) == 2 && os.Args[1] == "-version" {
+		fmt.Printf("gitlab-shell %s-%s\n", Version, BuildTime)
+		os.Exit(0)
+	}
+
 	readWriter := &readwriter.ReadWriter{
 		Out:    os.Stdout,
 		In:     os.Stdin,

cmd/gitlab-shell-authorized-principals-check/main.go

@@ -13,7 +13,21 @@ import (
 	"gitlab.com/gitlab-org/gitlab-shell/v14/internal/logger"
 )
 
+var (
+	// Version is the current version of gitlab-shell
+	Version = "(unknown version)" // Set at build time in the Makefile
+	// BuildTime signifies the time the binary was build
+	BuildTime = "19700101.000000" // Set at build time in the Makefile
+)
+
 func main() {
+	// We can't use the flag library because gitlab-shell receives other arguments
+	// that confuse the parser.
+	if len(os.Args) == 2 && os.Args[1] == "-version" {
+		fmt.Printf("gitlab-shell %s-%s\n", Version, BuildTime)
+		os.Exit(0)
+	}
+
 	readWriter := &readwriter.ReadWriter{
 		Out:    os.Stdout,
 		In:     os.Stdin,

cmd/gitlab-sshd/main.go

@@ -3,6 +3,7 @@ package main
 import (
 	"context"
 	"flag"
+	"fmt"
 	"os"
 	"os/signal"
 	"syscall"
@@ -19,11 +20,12 @@ import (
 
 var (
 	configDir = flag.String("config-dir", "", "The directory the config is in")
+	version   = flag.Bool("version", false, "Prints current version")
 
-	// BuildTime signifies the time the binary was build.
-	BuildTime = "2021-02-16T09:28:07+01:00" // Set at build time in the Makefile
-	// Version is the current version of GitLab Shell sshd.
+	// Version is the current version of gitlab-shell
 	Version = "(unknown version)" // Set at build time in the Makefile
+	// BuildTime signifies the time the binary was build
+	BuildTime = "19700101.000000" // Set at build time in the Makefile
 )
 
 func overrideConfigFromEnvironment(cfg *config.Config) {
@@ -44,6 +46,12 @@ func overrideConfigFromEnvironment(cfg *config.Config) {
 
 func main() {
 	flag.Parse()
+
+	if *version {
+		fmt.Printf("gitlab-sshd %s-%s\n", Version, BuildTime)
+		os.Exit(0)
+	}
+
 	cfg := new(config.Config)
 	if *configDir != "" {
 		var err error
@@ -52,6 +60,7 @@ func main() {
 			log.WithError(err).Fatal("failed to load configuration from specified directory")
 		}
 	}
+
 	overrideConfigFromEnvironment(cfg)
 	if err := cfg.IsSane(); err != nil {
 		if *configDir == "" {