Add support for 'WithModificationTIme()' option

[anatol]

In some situations I need to set modification time for the new file.

Having an Option WithPermissions

func WithModificationTime(time time.Time) Option {
	return optionFunc(func(cfg *config) {
		cfg.modTime = &time
	})
}

that takes provided time into account and updates the resulting file would make it possible.

[stapelberg]

I was about to say “can’t you os.Chtimes() before calling CloseAtomicallyReplace()?”, but I think the problem might be that the t.Sync() and/or t.Close() that CloseAtomicallyReplace calls change the modification time themselves, so the Chtimes needs to happen just above

renameio/tempfile.go

Line 165 in 0450d4d

if err := os.Rename(t.Name(), t.path); err != nil {

Sounds reasonable, pull requests welcome. We probably need to make both atime and mtime configurable in a single option as that’s what os.Chtimes() wants.