add version

Signed-off-by: Lei Xue <vfs@live.com>

pkg/version/version.go

@@ -17,8 +17,41 @@ limitations under the License.
 // Package version provides the Version information.
 package version
 
+import (
+	"fmt"
+	"os"
+	"runtime"
+)
+
 const (
-	Version = "0.1"
+	// Version shows the version of gotgt.
+	Version = "Not provided."
 	// SCSI version string MUST be shorter than 4 characters
 	SCSIVersion = "0.1"
+	// GitSHA shoows the git commit id of volcano.
+	GitSHA = "Not provided."
+	// Built shows the built time of the binary.
+	Built = "Not provided."
+
+	apiVersion = "v1alpha1"
 )
+
+// PrintVersionAndExit prints versions from the array returned by Info() and exit
+func PrintVersionAndExit() {
+	for _, i := range Info(apiVersion) {
+		fmt.Printf("%v\n", i)
+	}
+	os.Exit(0)
+}
+
+// Info returns an array of various service versions
+func Info(apiVersion string) []string {
+	return []string{
+		fmt.Sprintf("API Version: %s", apiVersion),
+		fmt.Sprintf("Version: %s", Version),
+		fmt.Sprintf("Git SHA: %s", GitSHA),
+		fmt.Sprintf("Built At: %s", Built),
+		fmt.Sprintf("Go Version: %s", runtime.Version()),
+		fmt.Sprintf("Go OS/Arch: %s/%s", runtime.GOOS, runtime.GOARCH),
+	}
+}