show version in UI

cmd/ingestd/buildinfo.go

@@ -0,0 +1,59 @@
+package main
+
+import (
+	"runtime/debug"
+	"strings"
+)
+
+var (
+	version   = "dev"
+	gitCommit = "unknown"
+	buildTime = "unknown"
+)
+
+type binaryBuildInfo struct {
+	Version   string `json:"version"`
+	GitCommit string `json:"git_commit"`
+	BuildTime string `json:"build_time"`
+}
+
+func currentBuildInfo() binaryBuildInfo {
+	out := binaryBuildInfo{
+		Version:   version,
+		GitCommit: gitCommit,
+		BuildTime: buildTime,
+	}
+
+	if bi, ok := debug.ReadBuildInfo(); ok {
+		if out.Version == "" || out.Version == "dev" {
+			if bi.Main.Version != "" && bi.Main.Version != "(devel)" {
+				out.Version = bi.Main.Version
+			}
+		}
+		for _, s := range bi.Settings {
+			if s.Key == "vcs.revision" && (out.GitCommit == "" || out.GitCommit == "unknown") {
+				if len(s.Value) > 12 {
+					out.GitCommit = s.Value[:12]
+				} else {
+					out.GitCommit = s.Value
+				}
+			}
+			if s.Key == "vcs.time" && (out.BuildTime == "" || out.BuildTime == "unknown") {
+				out.BuildTime = s.Value
+			}
+		}
+	}
+
+	out.Version = normalizeBuildField(out.Version, "dev")
+	out.GitCommit = normalizeBuildField(out.GitCommit, "unknown")
+	out.BuildTime = normalizeBuildField(out.BuildTime, "unknown")
+	return out
+}
+
+func normalizeBuildField(v string, fallback string) string {
+	v = strings.TrimSpace(v)
+	if v == "" {
+		return fallback
+	}
+	return v
+}