Check if directory is a mountpoint

[Shay_Berman]

How to check if golang if a directory is a mountpoint and what is the device behind the mountpoint?

[lutzhorn]

What OS? What kind of mount: FAT drive, WebDAV, CIFS, …?

[Shay_Berman]

• Linux (rhel and ubuntu)
• multipath device (e.g : /dev/mapper/mpathd)
• The filesystem on the mountpoint is less relevant, just want to know if dirX is a mountpoint and if so what is the device of this mountpoint?

[Shay_Berman]

I can do something simple like this:
func getMount(mountdir string) (string, error){
res, err := exec.Command(“sh”, “-c”, fmt.Sprintf(“mount | grep -w %s”, mountdir)).Output()
if err != nil{
return “”, err
}
lines := strings.Split(string(res[:]), “\n”)
if len(lines) != 1{
return “”, fmt.Errorf(“bad mount output”)
}
fields := strings.Fields(lines[0])
if len(fields) != 6{
return “”, fmt.Errorf(“bad mount line formating”)
}
device=fields[0]
return device, nill
}

but of cause its better to do it in golang way

[NobbZ (Norbert Melzer)]

Maybe os.File.Stat() contains something useful?

It returns a os.FileInfo.

[norrchr (Chris)]

You can parse /proc/self/mountinfo to get a list of all mount points and their backing device.

You can then maybe use multipath to get any further information your looking for.