v.os.Remove(tmpfile.Name())
return err
}
+ // ext4 uses a low-precision clock and effectively backdates
+ // files by up to 10 ms, sometimes across a 1-second boundary,
+ // which produces confusing results in logs and tests. We
+ // avoid this by setting the output file's timestamps
+ // explicitly, using a higher resolution clock.
+ ts := syscall.NsecToTimespec(time.Now().UnixNano())
+ if err = syscall.UtimesNano(tmpfile.Name(), []syscall.Timespec{ts, ts}); err != nil {
+ err = fmt.Errorf("error setting timestamps on %s: %s", tmpfile.Name(), err)
+ v.os.Remove(tmpfile.Name())
+ return err
+ }
if err := v.os.Rename(tmpfile.Name(), bpath); err != nil {
err = fmt.Errorf("error renaming %s to %s: %s", tmpfile.Name(), bpath, err)
v.os.Remove(tmpfile.Name())