build: Versioning now populated through ldflags

buildscripts/gen-ldflags.go

@@ -20,50 +20,19 @@ package main
 
 import (
 	"fmt"
-	"net/http"
 	"os"
 	"os/exec"
 	"strings"
-	"text/template"
 	"time"
 )
 
-var constantsTemplate = `// --------  DO NOT EDIT --------
-// This file is autogenerated by buildscripts/gen-constants.go during the release process.
-
-package main
-
-const (
-	minioVersion    = {{if .Version}}"{{.Version}}"{{else}}""{{end}}
-	minioReleaseTag = {{if .ReleaseTag}}"{{.ReleaseTag}}"{{else}}""{{end}}
-	minioCommitID   = {{if .CommitID}}"{{.CommitID}}"{{else}}""{{end}}
-)
-
-var (
-	minioShortCommitID = minioCommitID[:12]
-)
-`
-
-// genConstants generates ‘build-constants.go’.
-func genConstants(version string) {
-	t := template.Must(template.New("constants").Parse(constantsTemplate))
-	constantsFile, e := os.OpenFile("build-constants.go", os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0600)
-	if e != nil {
-		fmt.Printf("gen-constants: Unable to create ‘build-constants.go’. Error: %s.\n", e)
-		os.Exit(1)
-	}
-	defer constantsFile.Close()
-
-	e = t.Execute(constantsFile, struct {
-		Version    string
-		ReleaseTag string
-		CommitID   string
-	}{version, releaseTag(version), commitID()})
-
-	if e != nil {
-		fmt.Printf("gen-constants: Unable to generate ‘build-constants.go’. Error: %s.\n", e)
-		os.Exit(1)
-	}
+func genLDFlags(version string) string {
+	var ldflagsStr string
+	ldflagsStr = "\"-X main.minioVersion=" + version + " "
+	ldflagsStr = ldflagsStr + "-X main.minioReleaseTag=" + releaseTag(version) + " "
+	ldflagsStr = ldflagsStr + "-X main.minioCommitID=" + commitID() + " "
+	ldflagsStr = ldflagsStr + "-X main.minioShortCommitID=" + commitID()[:12] + "\""
+	return ldflagsStr
 }
 
 // genReleaseTag prints release tag to the console for easy git tagging.
@@ -97,13 +66,5 @@ func commitID() string {
 }
 
 func main() {
-	// Version is in HTTP TimeFormat.
-	version := time.Now().UTC().Format(http.TimeFormat)
-
-	// generate ‘build-constants.go’ file.
-	genConstants(version)
-
-	fmt.Println("Version: \"" + version + "\"")
-	fmt.Println("Release-Tag: " + releaseTag(version))
-	fmt.Println("Commit-ID: " + commitID())
+	fmt.Println(genLDFlags(time.Now().UTC().Format(time.RFC3339)))
 }