package main

import (
	"bufio"
	"bytes"
	"os/exec"
	"regexp"
)

var (
	mountLineRegex = regexp.MustCompile(`^.*? on (.*?) type (.*?) \((?:.*?[,)])*$`)
)

func Mounts() (map[string]struct{}, error) {
	mounts := map[string]struct{}{}

	out, err := exec.Command("mount").CombinedOutput()
	if err != nil {
		return nil, err
	}

	s := bufio.NewScanner(bytes.NewReader(out))
	for s.Scan() {
		matches := mountLineRegex.FindAllStringSubmatch(s.Text(), -1)
		if len(matches) == 0 {
			continue
		}
		mounts[matches[0][1]] = struct{}{}
	}

	return mounts, nil
}