update '-v' flag behavior to include copyRight and license (#15097)

```
~ minio -v
minio version DEVELOPMENT.2022-06-16T20-40-14Z (commit-id=e083228e2a06bfdcd006fee28d449cd2b47c542a)
Runtime: go1.18.3 linux/amd64
Copyright (c) 2015-2022 MinIO, Inc.
Licence AGPLv3 <https://www.gnu.org/licenses/agpl-3.0.html>
```

buildscripts/gen-ldflags.go

@@ -24,14 +24,18 @@ import (
 	"fmt"
 	"os"
 	"os/exec"
+	"strconv"
 	"strings"
 	"time"
 )
 
 func genLDFlags(version string) string {
+	releaseTag, date := releaseTag(version)
+	copyrightYear := strconv.Itoa(date.Year())
 	ldflagsStr := "-s -w"
 	ldflagsStr += " -X github.com/minio/minio/cmd.Version=" + version
-	ldflagsStr += " -X github.com/minio/minio/cmd.ReleaseTag=" + releaseTag(version)
+	ldflagsStr += " -X github.com/minio/minio/cmd.CopyrightYear=" + copyrightYear
+	ldflagsStr += " -X github.com/minio/minio/cmd.ReleaseTag=" + releaseTag
 	ldflagsStr += " -X github.com/minio/minio/cmd.CommitID=" + commitID()
 	ldflagsStr += " -X github.com/minio/minio/cmd.ShortCommitID=" + commitID()[:12]
 	ldflagsStr += " -X github.com/minio/minio/cmd.GOPATH=" + os.Getenv("GOPATH")
@@ -40,7 +44,7 @@ func genLDFlags(version string) string {
 }
 
 // genReleaseTag prints release tag to the console for easy git tagging.
-func releaseTag(version string) string {
+func releaseTag(version string) (string, time.Time) {
 	relPrefix := "DEVELOPMENT"
 	if prefix := os.Getenv("MINIO_RELEASE"); prefix != "" {
 		relPrefix = prefix
@@ -53,14 +57,17 @@ func releaseTag(version string) string {
 
 	relTag := strings.Replace(version, " ", "-", -1)
 	relTag = strings.Replace(relTag, ":", "-", -1)
+	t, err := time.Parse("2006-01-02T15-04-05Z", relTag)
+	if err != nil {
+		panic(err)
+	}
 	relTag = strings.Replace(relTag, ",", "", -1)
 	relTag = relPrefix + "." + relTag
-
 	if relSuffix != "" {
 		relTag += "." + relSuffix
 	}
 
-	return relTag
+	return relTag, t
 }
 
 // commitID returns the abbreviated commit-id hash of the last commit.

cmd/build-constants.go

@@ -1,4 +1,4 @@
-// Copyright (c) 2015-2021 MinIO, Inc.
+// Copyright (c) 2015-2022 MinIO, Inc.
 //
 // This file is part of MinIO Object Storage stack
 //
@@ -37,4 +37,7 @@ var (
 
 	// ShortCommitID - first 12 characters from CommitID.
 	ShortCommitID = "DEVELOPMENT.GOGET"
+
+	// CopyrightYear - dynamic value of the copyright end year
+	CopyrightYear = "0000"
 )

cmd/main.go

@@ -18,12 +18,14 @@
 package cmd
 
 import (
+	"fmt"
 	"os"
 	"path/filepath"
 	"runtime"
 	"sort"
 
 	"github.com/minio/cli"
+	"github.com/minio/minio/internal/color"
 	"github.com/minio/pkg/console"
 	"github.com/minio/pkg/trie"
 	"github.com/minio/pkg/words"
@@ -69,11 +71,6 @@ var GlobalFlags = []cli.Flag{
 	},
 }
 
-var versionFlag = cli.BoolFlag{
-	Name:  "version, v",
-	Usage: "print version information",
-}
-
 // Help template for minio.
 var minioHelpTemplate = `NAME:
   {{.Name}} - {{.Usage}}
@@ -137,20 +134,16 @@ func newApp(name string) *cli.App {
 		Name:  "help, h",
 		Usage: "show help",
 	}
-
-	topLevelFlags := make([]cli.Flag, len(GlobalFlags)+1)
-	copy(topLevelFlags, GlobalFlags)
-	topLevelFlags[len(GlobalFlags)] = versionFlag
+	cli.VersionPrinter = printMinIOVersion
 
 	app := cli.NewApp()
 	app.Name = name
 	app.Author = "MinIO, Inc."
-	app.Action = versionAndHelpAction
+	app.Version = ReleaseTag
 	app.Usage = "High Performance Object Storage"
 	app.Description = `Build high performance data infrastructure for machine learning, analytics and application data workloads with MinIO`
-	app.Flags = topLevelFlags
+	app.Flags = GlobalFlags
 	app.HideHelpCommand = true // Hide `help, h` command, we already have `minio --help`.
-	app.HideVersion = true
 	app.Commands = commands
 	app.CustomAppHelpTemplate = minioHelpTemplate
 	app.CommandNotFound = func(ctx *cli.Context, command string) {
@@ -170,16 +163,11 @@ func newApp(name string) *cli.App {
 	return app
 }
 
-func versionAndHelpAction(ctx *cli.Context) {
-	if ctx.IsSet("version") {
-		console.Printf("%s version %s\n", ctx.App.Name, ReleaseTag)
-		console.Printf("commit: %s\n", CommitID)
-		console.Printf("go version: %s\n", runtime.Version())
-
-		return
-	}
-
-	cli.ShowAppHelpAndExit(ctx, 1)
+func printMinIOVersion(c *cli.Context) {
+	fmt.Fprintln(c.App.Writer, color.Greenf("%s version %s (commit-id=%s)", c.App.Name, c.App.Version, CommitID))
+	fmt.Fprintln(c.App.Writer, color.Greenf("Runtime: %s %s/%s", runtime.Version(), runtime.GOOS, runtime.GOARCH))
+	fmt.Fprintln(c.App.Writer, color.Greenf("Copyright (c) 2015-%s MinIO, Inc.", CopyrightYear))
+	fmt.Fprintln(c.App.Writer, color.Red("Licence AGPLv3 <https://www.gnu.org/licenses/agpl-3.0.html>"))
 }
 
 // Main main for minio server.

internal/color/color.go

@@ -73,6 +73,13 @@ var (
 		return fmt.Sprint
 	}()
 
+	Greenf = func() func(format string, a ...interface{}) string {
+		if IsTerminal() {
+			return color.New(color.FgGreen).SprintfFunc()
+		}
+		return fmt.Sprintf
+	}()
+
 	GreenBold = func() func(a ...interface{}) string {
 		if IsTerminal() {
 			return color.New(color.FgGreen, color.Bold).SprintFunc()