cmd: add version to command worker and overlord, print go version

Closes #272

cmd/dex-overlord/main.go

@@ -7,6 +7,8 @@ import (
 	"net/http"
 	"net/url"
 	"os"
+	"runtime"
+	"strings"
 	"time"
 
 	"github.com/coreos/go-oidc/key"
@@ -50,6 +52,8 @@ func main() {
 	logDebug := fs.Bool("log-debug", false, "log debug-level information")
 	logTimestamps := fs.Bool("log-timestamps", false, "prefix log lines with timestamps")
 
+	printVersion := fs.Bool("version", false, "Print the version and exit")
+
 	if err := fs.Parse(os.Args[1:]); err != nil {
 		fmt.Fprintln(os.Stderr, err.Error())
 		os.Exit(1)
@@ -60,6 +64,11 @@ func main() {
 		os.Exit(1)
 	}
 
+	if *printVersion {
+		fmt.Printf("dex version %s\ngo version %s\n", strings.TrimPrefix(version, "v"), strings.TrimPrefix(runtime.Version(), "go"))
+		os.Exit(0)
+	}
+
 	if *logDebug {
 		log.EnableDebug()
 	}

cmd/dex-worker/main.go

@@ -7,6 +7,8 @@ import (
 	"net/http"
 	"net/url"
 	"os"
+	"runtime"
+	"strings"
 	"time"
 
 	"github.com/coreos/pkg/flagutil"
@@ -62,6 +64,7 @@ func main() {
 
 	dbMaxIdleConns := fs.Int("db-max-idle-conns", 0, "maximum number of connections in the idle connection pool")
 	dbMaxOpenConns := fs.Int("db-max-open-conns", 0, "maximum number of open connections to the database")
+	printVersion := fs.Bool("version", false, "Print the version and exit")
 
 	// used only if --no-db is set
 	connectors := fs.String("connectors", "./static/fixtures/connectors.json", "JSON file containg set of IDPC configs")
@@ -81,6 +84,11 @@ func main() {
 		os.Exit(1)
 	}
 
+	if *printVersion {
+		fmt.Printf("dex version %s\ngo version %s\n", strings.TrimPrefix(version, "v"), strings.TrimPrefix(runtime.Version(), "go"))
+		os.Exit(0)
+	}
+
 	if *logDebug {
 		log.EnableDebug()
 		log.Infof("Debug logging enabled.")

cmd/dexctl/command_version.go

 package main
 
-import "github.com/spf13/cobra"
+import (
+	"runtime"
+	"strings"
+
+	"github.com/spf13/cobra"
+)
 
 var (
 	// set by the top level build script
@@ -11,7 +16,7 @@ var (
 		Short: "Print the dexctl version.",
 		Long:  "Print the dexctl version.",
 		Run: func(cmd *cobra.Command, args []string) {
-			stdout(version)
+			stdout("dex version %s\ngo version %s", strings.TrimPrefix(version, "v"), strings.TrimPrefix(runtime.Version(), "go"))
 		},
 	}
 )