overlayfs/mergefs_unix.go

//go:build unix

package overlayfs

import (
	"errors"
	"io/fs"
	"os"
	"path/filepath"
	"syscall"
	"time"
)

func (over Overlayfs) Utimens(name string, access, modification time.Time) error {
	if !over.isPathInsideOverlay(name) {
		return &fs.PathError{Op: "utimens", Path: name, Err: fs.ErrInvalid}
	} else if !over.isRW() {
		return &fs.PathError{Op: "utimens", Path: name, Err: fs.ErrPermission}
	}

	for layer := range over.Lower {
		if _, err := os.Stat(filepath.Join(over.Lower[layer], name)); err == nil {
			// Clone file to upper if not exists
			if err := over.copyFileToUpperIfAbsent(name); err != nil && !errors.Is(err, fs.ErrNotExist) {
				return rewriteName(name, err)
			}
			break
		}
	}

	return rewriteName(name, syscall.Utimes(filepath.Join(over.Upper, name), []syscall.Timeval{
		syscall.NsecToTimeval(access.UnixNano()),
		syscall.NsecToTimeval(modification.UnixNano()),
	}))
}