GoTomato/internal/metadata/version.go

package metadata

import (
	"os/exec"
	"runtime/debug"
	"strings"
)

var (
	GoTomatoVersion = "" // The GoTomato version
	ProtocolVersion = "" // The protocol version
)

func stripVersionPrefix(version string) string {
	return strings.TrimLeft(version, "v")
}

func getLatestTag() string {
	bytes, _ := exec.Command("git", "describe", "--tags").Output()
	output := strings.TrimSpace(string(bytes))
	return stripVersionPrefix(output)
}

// set version from runtime/debug.Main.Version
// use latest git tag as fallback
// allow GoTomatoVersion to be overwritten via ldflags
func init() {
	if GoTomatoVersion == "" {
		info, _ := debug.ReadBuildInfo()
		if info.Main.Version != "(devel)" {
			GoTomatoVersion = stripVersionPrefix(info.Main.Version)
		} else {
			GoTomatoVersion = getLatestTag()
		}
	}
	ProtocolVersion = strings.Split(GoTomatoVersion, ".")[0] // The protocol version
}