Merge pull request #7 from alibaba/develop

update

conf/redis-shake.conf

@@ -4,7 +4,8 @@
 id = redis-shake
 # log file，日志文件，不配置将打印到stdout (e.g. /var/log/redis-shake.log )
 log_file =
-# pid path，进程文件存储地址，不配置将输出到项目目录下 （e.g. /var/run/ )
+# pid path，进程文件存储地址，不配置将输出到项目目录下（e.g. /var/run/), 注意这个是目录，
+# 真正的pid是`{pid_path}/{id}.pid`
 pid_path =
 
 # pprof port

src/redis-shake/common/mix.go

@@ -24,11 +24,22 @@ func WritePid(id string) (err error) {
 
 func WritePidById(id string, path string) error {
 	var dir string
+	var err error
 	if path == "" {
-		dir, _ = os.Getwd()
+		if dir, err = os.Getwd(); err != nil {
+			return err
+		}
 	} else {
 		dir = path
+		if _, err := os.Stat(dir); os.IsNotExist(err) {
+			os.Mkdir(dir, os.ModePerm)
+		}
 	}
+
+	if dir, err = filepath.Abs(dir); err != nil {
+		return err
+	}
+
 	pidfile := filepath.Join(dir, id) + ".pid"
 	if err := WritePid(pidfile); err != nil {
 		return err