job: more appropriate credential

common.go

@@ -1,12 +1,16 @@
 package cronsun
 
 import (
+	"os"
+
 	"github.com/shunfei/cronsun/conf"
 	"github.com/shunfei/cronsun/db"
 )
 
 var (
 	initialized bool
+
+	_Uid int
 )
 
 func Init() (err error) {
@@ -34,6 +38,8 @@ func Init() (err error) {
 		return
 	}
 
+	_Uid = os.Getuid()
+
 	initialized = true
 	return
 }

job.go

@@ -421,12 +421,14 @@ func (j *Job) Run() bool {
 			j.Fail(t, "not support run with user on windows")
 			return false
 		}
-		gid, _ := strconv.Atoi(u.Gid)
-		sysProcAttr = &syscall.SysProcAttr{
-			Credential: &syscall.Credential{
-				Uid: uint32(uid),
-				Gid: uint32(gid),
-			},
+		if uid != _Uid {
+			gid, _ := strconv.Atoi(u.Gid)
+			sysProcAttr = &syscall.SysProcAttr{
+				Credential: &syscall.Credential{
+					Uid: uint32(uid),
+					Gid: uint32(gid),
+				},
+			}
 		}
 	}