//go:build !linux

package instancefs

import (
	"errors"
	"os"
)

func OpenBeneath(dir, name string, flag int, perm os.FileMode) (*os.File, error) {
	if _, err := cleanRel(name); err != nil {
		return nil, err
	}
	return nil, errors.ErrUnsupported
}

func OpenBeneathOrAbsent(dir, name string) (*os.File, bool, error) {
	if _, err := cleanRel(name); err != nil {
		return nil, false, err
	}
	return nil, false, errors.ErrUnsupported
}

func OpenDirBeneath(dir, name string) (*os.File, error) {
	if _, err := cleanRel(name); err != nil {
		return nil, err
	}
	return nil, errors.ErrUnsupported
}

func OpenRootBeneath(dir, name string) (*os.Root, error) {
	if _, err := cleanRel(name); err != nil {
		return nil, err
	}
	return nil, errors.ErrUnsupported
}

func WriteAtomic(dir, name string, data []byte, perm os.FileMode) error {
	if _, err := cleanRel(name); err != nil {
		return err
	}
	return errors.ErrUnsupported
}

func SelfCheck(dir string) error { return errors.ErrUnsupported }

func MountOptionOf(mountpoint, opt string) (bool, error) { return false, errors.ErrUnsupported }

func MountNoSymfollow(mountpoint string) (bool, error) {
	return MountOptionOf(mountpoint, "nosymfollow")
}

func mountinfoLineHas(line, mountpoint, option string) bool { return false }

func EnsureDirBeneath(dir, name string, perm os.FileMode) (DirStat, error) {
	if err := bareName(name); err != nil {
		return DirStat{}, err
	}
	return DirStat{}, errors.ErrUnsupported
}

func StatDir(dir string) (DirStat, error) { return DirStat{}, errors.ErrUnsupported }

func RenameBetween(srcDir, srcName, dstDir, dstName string) error {
	if err := bareName(srcName); err != nil {
		return err
	}
	if err := bareName(dstName); err != nil {
		return err
	}
	return errors.ErrUnsupported
}

func RenameBetweenNoReplace(srcDir, srcName, dstDir, dstName string) error {
	return RenameBetween(srcDir, srcName, dstDir, dstName)
}

func RemoveBeneath(dir, name string) error {
	if err := bareName(name); err != nil {
		return err
	}
	return errors.ErrUnsupported
}

func RemoveAllBeneath(dir, name string) error {
	if err := bareName(name); err != nil {
		return err
	}
	return errors.ErrUnsupported
}