dev: add Go version to version information

cmd/golangci-lint/main.go

@@ -3,20 +3,40 @@ package main
 import (
 	"fmt"
 	"os"
+	"runtime/debug"
 
 	"github.com/golangci/golangci-lint/pkg/commands"
 	"github.com/golangci/golangci-lint/pkg/exitcodes"
 )
 
 var (
+	goVersion = "unknown"
+
 	// Populated by goreleaser during build
 	version = "master"
 	commit  = "?"
 	date    = ""
 )
 
 func main() {
-	e := commands.NewExecutor(version, commit, date)
+	if buildInfo, available := debug.ReadBuildInfo(); available {
+		goVersion = buildInfo.GoVersion
+
+		if date == "" {
+			version = buildInfo.Main.Version
+			commit = fmt.Sprintf("(unknown, mod sum: %q)", buildInfo.Main.Sum)
+			date = "(unknown)"
+		}
+	}
+
+	info := commands.BuildInfo{
+		GoVersion: goVersion,
+		Version:   version,
+		Commit:    commit,
+		Date:      date,
+	}
+
+	e := commands.NewExecutor(info)
 
 	if err := e.Execute(); err != nil {
 		fmt.Fprintf(os.Stderr, "failed executing command with error %v\n", err)

pkg/commands/executor.go

@@ -30,13 +30,20 @@ import (
 	"github.com/golangci/golangci-lint/pkg/timeutils"
 )
 
+type BuildInfo struct {
+	GoVersion string `json:"goVersion"`
+	Version   string `json:"version"`
+	Commit    string `json:"commit"`
+	Date      string `json:"date"`
+}
+
 type Executor struct {
 	rootCmd    *cobra.Command
 	runCmd     *cobra.Command
 	lintersCmd *cobra.Command
 
-	exitCode              int
-	version, commit, date string
+	exitCode  int
+	buildInfo BuildInfo
 
 	cfg               *config.Config // cfg is the unmarshaled data from the golangci config file.
 	log               logutils.Log
@@ -56,13 +63,11 @@ type Executor struct {
 }
 
 // NewExecutor creates and initializes a new command executor.
-func NewExecutor(version, commit, date string) *Executor {
+func NewExecutor(buildInfo BuildInfo) *Executor {
 	startedAt := time.Now()
 	e := &Executor{
 		cfg:       config.NewDefault(),
-		version:   version,
-		commit:    commit,
-		date:      date,
+		buildInfo: buildInfo,
 		DBManager: lintersdb.NewManager(nil, nil),
 		debugf:    logutils.Debug(logutils.DebugKeyExec),
 	}
@@ -135,7 +140,7 @@ func NewExecutor(version, commit, date string) *Executor {
 	e.loadGuard = load.NewGuard()
 	e.contextLoader = lint.NewContextLoader(e.cfg, e.log.Child(logutils.DebugKeyLoader), e.goenv,
 		e.lineCache, e.fileCache, e.pkgCache, e.loadGuard)
-	if err = e.initHashSalt(version); err != nil {
+	if err = e.initHashSalt(buildInfo.Version); err != nil {
 		e.log.Fatalf("Failed to init hash salt: %s", err)
 	}
 	e.debugf("Initialized executor in %s", time.Since(startedAt))

pkg/commands/root.go

@@ -24,7 +24,7 @@ const (
 
 func (e *Executor) persistentPreRun(_ *cobra.Command, _ []string) error {
 	if e.cfg.Run.PrintVersion {
-		_, _ = fmt.Fprintf(logutils.StdOut, "golangci-lint has version %s built from %s on %s\n", e.version, e.commit, e.date)
+		_ = printVersion(logutils.StdOut, e.buildInfo)
 		os.Exit(exitcodes.Success) // a return nil is not enough to stop the process because we are inside the `preRun`.
 	}
 
@@ -145,7 +145,7 @@ func (e *Executor) initRoot() {
 }
 
 func (e *Executor) needVersionOption() bool {
-	return e.date != ""
+	return e.buildInfo.Date != ""
 }
 
 func initRootFlagSet(fs *pflag.FlagSet, cfg *config.Config, needVersionOption bool) {

pkg/commands/version.go

@@ -3,7 +3,9 @@ package commands
 import (
 	"encoding/json"
 	"fmt"
+	"io"
 	"os"
+	"runtime/debug"
 	"strings"
 
 	"github.com/spf13/cobra"
@@ -12,10 +14,9 @@ import (
 	"github.com/golangci/golangci-lint/pkg/config"
 )
 
-type jsonVersion struct {
-	Version string `json:"version"`
-	Commit  string `json:"commit"`
-	Date    string `json:"date"`
+type versionInfo struct {
+	Info      BuildInfo
+	BuildInfo *debug.BuildInfo
 }
 
 func (e *Executor) initVersionConfiguration(cmd *cobra.Command) {
@@ -28,6 +29,7 @@ func initVersionFlagSet(fs *pflag.FlagSet, cfg *config.Config) {
 	// Version config
 	vc := &cfg.Version
 	fs.StringVar(&vc.Format, "format", "", wh("The version's format can be: 'short', 'json'"))
+	fs.BoolVar(&vc.Debug, "debug", false, wh("Add build information"))
 }
 
 func (e *Executor) initVersion() {
@@ -37,26 +39,45 @@ func (e *Executor) initVersion() {
 		Args:              cobra.NoArgs,
 		ValidArgsFunction: cobra.NoFileCompletions,
 		RunE: func(cmd *cobra.Command, _ []string) error {
+			if e.cfg.Version.Debug {
+				info, ok := debug.ReadBuildInfo()
+				if !ok {
+					return nil
+				}
+
+				switch strings.ToLower(e.cfg.Version.Format) {
+				case "json":
+					return json.NewEncoder(os.Stdout).Encode(versionInfo{
+						Info:      e.buildInfo,
+						BuildInfo: info,
+					})
+
+				default:
+					fmt.Println(info.String())
+					return printVersion(os.Stdout, e.buildInfo)
+				}
+			}
+
 			switch strings.ToLower(e.cfg.Version.Format) {
 			case "short":
-				fmt.Println(e.version)
+				fmt.Println(e.buildInfo.Version)
 				return nil
 
 			case "json":
-				ver := jsonVersion{
-					Version: e.version,
-					Commit:  e.commit,
-					Date:    e.date,
-				}
-				return json.NewEncoder(os.Stdout).Encode(&ver)
+				return json.NewEncoder(os.Stdout).Encode(e.buildInfo)
 
 			default:
-				fmt.Printf("golangci-lint has version %s built from %s on %s\n", e.version, e.commit, e.date)
-				return nil
+				return printVersion(os.Stdout, e.buildInfo)
 			}
 		},
 	}
 
 	e.rootCmd.AddCommand(versionCmd)
 	e.initVersionConfiguration(versionCmd)
 }
+
+func printVersion(w io.Writer, buildInfo BuildInfo) error {
+	_, err := fmt.Fprintf(w, "golangci-lint has version %s built with %s from %s on %s\n",
+		buildInfo.Version, buildInfo.GoVersion, buildInfo.Commit, buildInfo.Date)
+	return err
+}

pkg/config/config.go

@@ -38,6 +38,7 @@ func NewDefault() *Config {
 
 type Version struct {
 	Format string `mapstructure:"format"`
+	Debug  bool   `mapstructure:"debug"`
 }
 
 func IsGreaterThanOrEqualGo118(v string) bool {