//go:build linux || darwin

package fileops

import (
	"errors"
	"fmt"
	"os"
	"syscall"
)

func syncDirectory(path string) error {
	directory, err := os.Open(path)
	if err != nil {
		return err
	}
	defer func() { _ = directory.Close() }()

	return syncDirectoryFile(directory, path)
}

func syncDirectoryFile(directory *os.File, path string) error {
	err := directory.Sync()
	// Some Unix filesystems do not implement directory syncing. Report this
	// explicitly so callers do not confuse visible replacement with a durable one.
	if errors.Is(err, syscall.EINVAL) || errors.Is(err, syscall.ENOTSUP) {
		return fmt.Errorf("%w for %q: %w", ErrDirectorySyncUnsupported, path, err)
	}
	return err
}