Golang 将文件重命名为一个唯一的文件

unique_rename.go

import (
	"os"

	"github.com/satori/go.uuid"
	"github.com/williamsandrew/go-xchg"
	"golang.org/x/sys/unix"
)

func UniqueRename(oldpath, newpath_dir, newpath_prefix string) (newpath string, err error) {
	newpath_prefix = newpath_dir + "/" + newpath_prefix

	GetRandomString := func() string {
		return uuid.NewV4().String()
	}

	// 测试需要.
	//	i := 1
	//	GetRandomString := func() string {
	//		i++
	//		return fmt.Sprintf("%d", i)
	//	}

	for {
		newpath = newpath_prefix + GetRandomString()
		err = xchg.Renameat2(unix.AT_FDCWD, oldpath, unix.AT_FDCWD, newpath, xchg.NOREPLACE)
		if os.IsExist(err) {
			continue
		}
		break
	}

	return
}