在Go中获取文件夹的更改日期

Question

I want to get the date when a folder was renamed, from terminal it can be done using the stat command, e.g.:

> stat -x folders/folder1
File: "folders/folder1"
Size: 64           FileType: Directory
Mode: (0755/drwxr-xr-x)         Uid: (2006390509/username)  Gid: 
(296108113/EMEA\Domain Users)
Device: 1,4   Inode: 2599274    Links: 2
Access: Mon Nov 12 17:59:57 2018
Modify: Mon Nov 12 14:12:20 2018
Change: Mon Nov 12 17:28:01 2018 

The change date is the last date the folder's metadata was changed, which includes renaming.

Is there any way to get it with Go without using os.exec and parsing the output? os.Stat seems to provide only the last modification date which doesn't change when the folder is renamed.

Answer 1

Change time is not accessible in os.FileInfo but can be get via os.FileInfo.Sys() which stores that data.

You can get it by

package main

import (
    "fmt"
    "log"
    "os"
    "syscall"
    "time"
)

func main() {
    f, err := os.Stat("your/dir")
    if err != nil {
        log.Fatalf("err reading: %v", err)
    }

    //access change time saved in os.FileInfo.Sys()
    changeTime := f.Sys().(*syscall.Stat_t).Ctim

    fmt.Print(time.Unix(changeTime.Unix()).String())
}

Ofcourse you need to check if f.Sys() it's proper type, but yeah syscall.Stat_t.Ctim is probably what you wanted.