// Package mtab contains tools to work with /etc/mtab file.
package mtab

import (
	"bufio"
	"io"
	"os"
	"strings"
)

type MountPoint struct {
	Dev   string
	Mount string
	Type  string
	Opts  string
}

// Mounts returns a list of mount point from /etc/mtab.
func Mounts() ([]MountPoint, error) {
	file, err := os.Open("/etc/mtab")
	if err != nil {
		return nil, err
	}
	defer file.Close()
	r := bufio.NewReader(file)
	var out []MountPoint
	for {
		line, err := r.ReadString('\n')
		if err == io.EOF {
			break
		} else if err != nil {
			return nil, err
		}
		fields := strings.Fields(line)
		out = append(out, MountPoint{
			Dev:   fields[0],
			Mount: fields[1],
			Type:  fields[2],
			Opts:  fields[3],
		})
	}
	return out, nil
}