build: Versioning now populated through ldflags

buildscripts/gen-ldflags.go

@@ -0,0 +1,70 @@
+// +build ignore
+
+/*
+ * Minio Cloud Storage, (C) 2015 Minio, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package main
+
+import (
+	"fmt"
+	"os"
+	"os/exec"
+	"strings"
+	"time"
+)
+
+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.
+func releaseTag(version string) string {
+	relPrefix := "UNOFFICIAL"
+	if prefix := os.Getenv("MINIO_RELEASE"); prefix != "" {
+		relPrefix = prefix
+	}
+
+	relTag := strings.Replace(version, " ", "-", -1)
+	relTag = strings.Replace(relTag, ":", "-", -1)
+	relTag = strings.Replace(relTag, ",", "", -1)
+	return relPrefix + "." + relTag
+}
+
+// commitID returns the abbreviated commit-id hash of the last commit.
+func commitID() string {
+	// git log --format="%h" -n1
+	var (
+		commit []byte
+		e      error
+	)
+	cmdName := "git"
+	cmdArgs := []string{"log", "--format=%H", "-n1"}
+	if commit, e = exec.Command(cmdName, cmdArgs...).Output(); e != nil {
+		fmt.Fprintln(os.Stderr, "Error generating git commit-id: ", e)
+		os.Exit(1)
+	}
+
+	return strings.TrimSpace(string(commit))
+}
+
+func main() {
+	fmt.Println(genLDFlags(time.Now().UTC().Format(time.RFC3339)))
+}