mountinfo_bsd.go

//go:build freebsd || openbsd || darwin
// +build freebsd openbsd darwin

package mountinfo

import "syscall"

func getInfo(is []int8) string {
	var bs []byte
	for _, i := range is {
		if i == 0 {
			break
		}
		bs = append(bs, byte(i))
	}
	return string(bs)
}

// parseMountTable returns information about mounted filesystems
func parseMountTable(filter FilterFunc) ([]*Info, error) {
	count, err := syscall.Getfsstat(nil, 1 /* MNT_WAIT */)
	if err != nil {
		return nil, err
	}

	entries := make([]syscall.Statfs_t, count)
	_, err = syscall.Getfsstat(entries, 1 /* MNT_WAIT */)
	if err != nil {
		return nil, err
	}

	var out []*Info
	for _, entry := range entries {
		var skip, stop bool
		mountinfo := getMountinfo(entry)

		if filter != nil {
			// filter out entries we're not interested in
			skip, stop = filter(&mountinfo)
			if skip {
				continue
			}
		}

		out = append(out, &mountinfo)
		if stop {
			break
		}
	}
	return out, nil
}

func mounted(path string) (bool, error) {
	path, err := normalizePath(path)
	if err != nil {
		return false, err
	}
	// Fast path: compare st.st_dev fields.
	// This should always work for FreeBSD and OpenBSD.
	mounted, err := mountedByStat(path)
	if err == nil {
		return mounted, nil
	}

	// Fallback to parsing mountinfo
	return mountedByMountinfo(path)
}