tidb local_unix 代码
文件路径：/br/pkg/storage/local_unix.go
// Copyright 2020 PingCAP, Inc. Licensed under Apache-2.0.
//go:build !windows
package storage
import (
"os"
"syscall"
"github.com/pingcap/errors"
)
func mkdirAll(base string) error {
mask := syscall.Umask(0)
err := os.MkdirAll(base, localDirPerm)
syscall.Umask(mask)
return errors.Trace(err)
}