Add GerVar

fastboot/FastbootDevice.go

@@ -1,6 +1,7 @@
 package fastboot
 
 import (
+	"errors"
 	"fmt"
 	"log"
 
@@ -21,6 +22,12 @@ var Status = struct {
 	INFO: "INFO",
 }
 
+var Error = struct {
+	VarNotFound error
+}{
+	VarNotFound: errors.New("Variable not found"),
+}
+
 type FastbootDevice struct {
 	Serial string
 	Device *gousb.Device
@@ -148,6 +155,18 @@ func (d *FastbootDevice) Recv() (FastbootResponseStatus, []byte, error) {
 	return status, data[4:], nil
 }
 
+func (d *FastbootDevice) GerVar(variable string) (string, error) {
+	d.Send([]byte(fmt.Sprintf("getvar:%s", variable)))
+	status, resp, err := d.Recv()
+	if status == Status.FAIL {
+		err = Error.VarNotFound
+	}
+	if err != nil {
+		return "", err
+	}
+	return string(resp), nil
+}
+
 func (d *FastbootDevice) BootImage(data []byte) error {
 	err := d.download(data)
 	if err != nil {