// Chtimes changes the modification and access time of a given file.
func Chtimes(path string, atime, mtime time.Time) error {
// https://github.com/torvalds/linux/blob/2decb2682f80759f631c8332f9a2a34a02150a03/include/uapi/linux/fcntl.h#L56
var utimes [2]unix.Timespec
utimes[0] = unix.NsecToTimespec(atime.UnixNano())
utimes[1] = unix.NsecToTimespec(mtime.UnixNano())
if e := unix.UtimesNanoAt(unix.AT_FDCWD, path, utimes[0:], unix.AT_SYMLINK_NOFOLLOW); e != nil {
return &os.PathError{Op: "futimesat", Path: path, Err: e}
}
return nil
}
func (node Node) restoreSymlinkTimestamps(path string, utimes [2]syscall.Timespec) error {
dir, err := fs.Open(filepath.Dir(path))
defer dir.Close()
if err != nil {
return errors.Wrap(err, "Open")
}
times := []unix.Timespec{
{Sec: utimes[0].Sec, Nsec: utimes[0].Nsec},
{Sec: utimes[1].Sec, Nsec: utimes[1].Nsec},
}
err = unix.UtimesNanoAt(int(dir.Fd()), filepath.Base(path), times, unix.AT_SYMLINK_NOFOLLOW)
if err != nil {
return errors.Wrap(err, "UtimesNanoAt")
}
return nil
}