Show version information based on build metadata

cmd/icalm-benchmark/main.go

@@ -11,6 +11,7 @@ import (
 	"strings"
 	"sync"
 	"time"
+	"github.com/securitym0nkey/icalm/internal/config"
 )
 
 var version string = "v0.0.0-dev"
@@ -56,6 +57,7 @@ func stress(network string, addr string, stop int) (time.Duration, int, int) {
 }
 
 func main() {
+	version = config.VersionString()
 	var pFlag = flag.Int("p", runtime.NumCPU()/2, "Count of parallel worker routines to send queries")
 	var cFlag = flag.Int("c", 100000, "Amount of quries to do with each worker routine")
 	var versionFlag = flag.Bool("version", false, "Prints version and exists")

cmd/icalm-server/main.go

@@ -16,6 +16,7 @@ var version string = "v0.0.0-dev"
 
 
 func main() {
+	version = config.VersionString()
 
 	var httplistenFlag = flag.String("http-listen", "", "Address on which the server will listen for http requests. Example: 127.0.0.1:8226")
 	var linelistenFlag = flag.String("line-listen", "", "Address on which the server will listen for line-protocol requests. Example: 127.0.0.1:4226")

internal/config/version.go

@@ -0,0 +1,33 @@
+package config
+
+import (
+	"runtime/debug"
+	"strings"
+)
+
+func VersionString() string {
+	version := "v0.0.0-unknown"
+	if info, ok := debug.ReadBuildInfo(); ok {
+		for _, s := range info.Settings {
+			switch s.Key {
+			case "-tags":
+				for _, t := range strings.Split(s.Value, ",") {
+					if len(t) > 0 && t[0] == 'v' {
+						return t
+					}
+				}
+			case "vcs":
+				version = s.Value
+			case "vcs.revision":
+				if version == "git" && len(s.Value) >= 10 {
+					version += "-" + s.Value[:10]
+				}
+			case "vcs.modified":
+				if s.Value == "true" {
+					return (version + "-modified")
+				}
+			}
+		}
+	}
+	return version
+}