//go:build darwin

package main

import "golang.org/x/sys/unix"

// mountedFilesystems returns every mount point with the type of its
// filesystem, from the system's list of mounted filesystems. Where one
// filesystem is mounted over another, the later one in the list counts.
func mountedFilesystems() (map[string]string, error) {
	// The first call counts the filesystems, the second lists them.
	n, err := unix.Getfsstat(nil, unix.MNT_NOWAIT)
	if err != nil {
		return nil, err
	}

	list := make([]unix.Statfs_t, n)

	n, err = unix.Getfsstat(list, unix.MNT_NOWAIT)
	if err != nil {
		return nil, err
	}

	mounts := make(map[string]string, n)

	for _, st := range list[:n] {
		mounts[unix.ByteSliceToString(st.Mntonname[:])] =
			unix.ByteSliceToString(st.Fstypename[:])
	}

	return mounts, nil
}