//go:build !darwin

package main

import (
	"fmt"
	"os"
	"runtime"
)

// mountInfoPath is the file in which Linux lists the mounts the reading
// process sees.
const mountInfoPath = "/proc/self/mountinfo"

// mountedFilesystems returns every mount point with the type of its
// filesystem: on Linux read from mountInfoPath (see readMountInfo), and
// on any other system none.
func mountedFilesystems() (map[string]string, error) {
	if runtime.GOOS != goosLinux {
		return map[string]string{}, nil
	}

	f, err := os.Open(mountInfoPath)
	if err != nil {
		return nil, err
	}

	defer func() { _ = f.Close() }()

	mounts, err := readMountInfo(f)
	if err != nil {
		return nil, fmt.Errorf("read %s: %w", mountInfoPath, err)
	}

	return mounts, nil
}