fix: refactor telegraf version

Makefile

@@ -45,12 +45,12 @@ MAKEFLAGS += --no-print-directory
 GOOS ?= $(shell go env GOOS)
 GOARCH ?= $(shell go env GOARCH)
 HOSTGO := env -u GOOS -u GOARCH -u GOARM -- go
-
-LDFLAGS := $(LDFLAGS) -X main.commit=$(commit) -X main.branch=$(branch) -X main.goos=$(GOOS) -X main.goarch=$(GOARCH)
+INTERNAL_PKG=github.com/influxdata/telegraf/internal
+LDFLAGS := $(LDFLAGS) -X $(INTERNAL_PKG).commit=$(commit) -X $(INTERNAL_PKG).branch=$(branch)
 ifneq ($(tag),)
-	LDFLAGS += -X main.version=$(version)
+	LDFLAGS += -X $(INTERNAL_PKG).version=$(version)
 else
-	LDFLAGS += -X main.version=$(version)-$(commit)
+	LDFLAGS += -X $(INTERNAL_PKG).version=$(version)-$(commit)
 endif
 
 # Go built-in race detector works only for 64 bits architectures.

cmd/telegraf/telegraf.go

@@ -126,12 +126,6 @@ var fPlugins = flag.String("plugin-directory", "",
 	"path to directory containing external plugins")
 var fRunOnce = flag.Bool("once", false, "run one gather and exit")
 
-var (
-	version string
-	commit  string
-	branch  string
-)
-
 var stop chan struct{}
 
 func reloadLoop(
@@ -277,7 +271,7 @@ func runAgent(ctx context.Context,
 
 	logger.SetupLogging(logConfig)
 
-	log.Printf("I! Starting Telegraf %s", version)
+	log.Printf("I! Starting Telegraf %s", internal.Version())
 	log.Printf("I! Loaded inputs: %s", strings.Join(c.InputNames(), " "))
 	log.Printf("I! Loaded aggregators: %s", strings.Join(c.AggregatorNames(), " "))
 	log.Printf("I! Loaded processors: %s", strings.Join(c.ProcessorNames(), " "))
@@ -348,29 +342,6 @@ func usageExit(rc int) {
 	os.Exit(rc)
 }
 
-func formatFullVersion() string {
-	var parts = []string{"Telegraf"}
-
-	if version != "" {
-		parts = append(parts, version)
-	} else {
-		parts = append(parts, "unknown")
-	}
-
-	if branch != "" || commit != "" {
-		if branch == "" {
-			branch = "unknown"
-		}
-		if commit == "" {
-			commit = "unknown"
-		}
-		git := fmt.Sprintf("(git: %s %s)", branch, commit)
-		parts = append(parts, git)
-	}
-
-	return strings.Join(parts, " ")
-}
-
 func deleteEmpty(s []string) []string {
 	var r []string
 	for _, str := range s {
@@ -410,11 +381,6 @@ func main() {
 
 	logger.SetupLogging(logger.LogConfig{})
 
-	// Configure version
-	if err := internal.SetVersion(version); err != nil {
-		log.Println("Telegraf version already configured to: " + internal.Version())
-	}
-
 	// Load external plugins, if requested.
 	if *fPlugins != "" {
 		log.Printf("I! Loading external plugins from: %s", *fPlugins)
@@ -443,7 +409,7 @@ func main() {
 	if len(args) > 0 {
 		switch args[0] {
 		case "version":
-			fmt.Println(formatFullVersion())
+			fmt.Println(internal.FormatFullVersion())
 			return
 		case "config":
 			err := configCmd.Parse(args[1:])
@@ -534,7 +500,7 @@ func main() {
 		}
 		return
 	case *fVersion:
-		fmt.Println(formatFullVersion())
+		fmt.Println(internal.FormatFullVersion())
 		return
 	case *fSampleConfig:
 		printer.PrintSampleConfig(

internal/internal.go

@@ -23,35 +23,48 @@ import (
 const alphanum string = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"
 
 var (
-	ErrTimeout             = errors.New("command timed out")
-	ErrorNotImplemented    = errors.New("not implemented yet")
-	ErrorVersionAlreadySet = errors.New("version has already been set")
+	ErrTimeout          = errors.New("command timed out")
+	ErrorNotImplemented = errors.New("not implemented yet")
 )
 
-// Set via the main module
-var version string
+// Set via LDFLAGS -X
+var (
+	version = "unknown"
+	branch  = ""
+	commit  = ""
+)
 
 type ReadWaitCloser struct {
 	pipeReader *io.PipeReader
 	wg         sync.WaitGroup
 }
 
-// SetVersion sets the telegraf agent version
-func SetVersion(v string) error {
+// Version returns the telegraf agent version
+func Version() string {
+	return version
+}
+
+func FormatFullVersion() string {
+	var parts = []string{"Telegraf"}
+
 	if version != "" {
-		return ErrorVersionAlreadySet
-	}
-	version = v
-	if version == "" {
-		version = "unknown"
+		parts = append(parts, version)
+	} else {
+		parts = append(parts, "unknown")
 	}
 
-	return nil
-}
+	if branch != "" || commit != "" {
+		if branch == "" {
+			branch = "unknown"
+		}
+		if commit == "" {
+			commit = "unknown"
+		}
+		git := fmt.Sprintf("(git: %s@%s)", branch, commit)
+		parts = append(parts, git)
+	}
 
-// Version returns the telegraf agent version
-func Version() string {
-	return version
+	return strings.Join(parts, " ")
 }
 
 // ProductToken returns a tag for Telegraf that can be used in user agents.

internal/internal_test.go

@@ -219,18 +219,6 @@ func TestCompressWithGzipEarlyClose(t *testing.T) {
 	assert.Equal(t, r1, r2)
 }
 
-func TestVersionAlreadySet(t *testing.T) {
-	err := SetVersion("foo")
-	assert.NoError(t, err)
-
-	err = SetVersion("bar")
-
-	assert.Error(t, err)
-	assert.IsType(t, ErrorVersionAlreadySet, err)
-
-	assert.Equal(t, "foo", Version())
-}
-
 func TestAlignDuration(t *testing.T) {
 	tests := []struct {
 		name     string

plugins/inputs/internal/internal_test.go

@@ -21,13 +21,14 @@ func TestSelfPlugin(t *testing.T) {
 	stat.Incr(1)
 	stat.Incr(2)
 	require.NoError(t, s.Gather(acc))
+
 	acc.AssertContainsTaggedFields(t, "internal_mytest",
 		map[string]interface{}{
 			"test": int64(3),
 		},
 		map[string]string{
 			"test":    "foo",
-			"version": "",
+			"version": "unknown",
 		},
 	)
 	acc.ClearMetrics()
@@ -41,7 +42,7 @@ func TestSelfPlugin(t *testing.T) {
 		},
 		map[string]string{
 			"test":    "foo",
-			"version": "",
+			"version": "unknown",
 		},
 	)
 	acc.ClearMetrics()
@@ -59,7 +60,7 @@ func TestSelfPlugin(t *testing.T) {
 		},
 		map[string]string{
 			"test":    "foo",
-			"version": "",
+			"version": "unknown",
 		},
 	)
 }

plugins/outputs/opentelemetry/opentelemetry.go

@@ -4,8 +4,6 @@ package opentelemetry
 import (
 	"context"
 	_ "embed"
-	"fmt"
-	"runtime"
 	"time"
 
 	ntls "crypto/tls"
@@ -23,11 +21,12 @@ import (
 
 	"github.com/influxdata/telegraf"
 	"github.com/influxdata/telegraf/config"
+	"github.com/influxdata/telegraf/internal"
 	"github.com/influxdata/telegraf/plugins/common/tls"
 	"github.com/influxdata/telegraf/plugins/outputs"
 )
 
-var userAgent = fmt.Sprintf("telegraf (%s/%s)", runtime.GOOS, runtime.GOARCH)
+var userAgent = internal.ProductToken()
 
 // DO NOT REMOVE THE NEXT TWO LINES! This is required to embed the sampleConfig data.
 //go:embed sample.conf