Merge pull request #455 from bboreham/build-tags

version: add Go build tags to output

Author: Julien Pivotto

version/info.go

@@ -53,6 +53,7 @@ func NewCollector(program string) prometheus.Collector {
 				"goversion": GoVersion,
 				"goos":      GoOS,
 				"goarch":    GoArch,
+				"tags":      getTags(),
 			},
 		},
 		func() float64 { return 1 },
@@ -66,6 +67,7 @@ var versionInfoTmpl = `
   build date:       {{.buildDate}}
   go version:       {{.goVersion}}
   platform:         {{.platform}}
+  tags:             {{.tags}}
 `
 
 // Print returns version information.
@@ -79,6 +81,7 @@ func Print(program string) string {
 		"buildDate": BuildDate,
 		"goVersion": GoVersion,
 		"platform":  GoOS + "/" + GoArch,
+		"tags":      getTags(),
 	}
 	t := template.Must(template.New("version").Parse(versionInfoTmpl))
 
@@ -96,5 +99,5 @@ func Info() string {
 
 // BuildContext returns goVersion, platform, buildUser and buildDate information.
 func BuildContext() string {
-	return fmt.Sprintf("(go=%s, platform=%s, user=%s, date=%s)", GoVersion, GoOS+"/"+GoArch, BuildUser, BuildDate)
+	return fmt.Sprintf("(go=%s, platform=%s, user=%s, date=%s, tags=%s)", GoVersion, GoOS+"/"+GoArch, BuildUser, BuildDate, getTags())
 }

version/info_default.go

@@ -19,3 +19,7 @@ package version
 func getRevision() string {
 	return Revision
 }
+
+func getTags() string {
+	return "unknown" // Not available prior to Go 1.18
+}

version/info_go118.go

@@ -19,6 +19,7 @@ package version
 import "runtime/debug"
 
 var computedRevision string
+var computedTags string
 
 func getRevision() string {
 	if Revision != "" {
@@ -27,19 +28,24 @@ func getRevision() string {
 	return computedRevision
 }
 
+func getTags() string {
+	return computedTags
+}
+
 func init() {
-	computedRevision = computeRevision()
+	computedRevision, computedTags = computeRevision()
 }
 
-func computeRevision() string {
+func computeRevision() (string, string) {
 	var (
 		rev      = "unknown"
+		tags     = "unknown"
 		modified bool
 	)
 
 	buildInfo, ok := debug.ReadBuildInfo()
 	if !ok {
-		return rev
+		return rev, tags
 	}
 	for _, v := range buildInfo.Settings {
 		if v.Key == "vcs.revision" {
@@ -50,9 +56,12 @@ func computeRevision() string {
 				modified = true
 			}
 		}
+		if v.Key == "-tags" {
+			tags = v.Value
+		}
 	}
 	if modified {
-		return rev + "-modified"
+		return rev + "-modified", tags
 	}
-	return rev
+	return rev, tags
 }