Re: [libvirt] [RFC 0/7] Warn at runtime when deprecated features are used
On Fri, 2018-10-05 at 12:05 +0100, Daniel P. Berrangé wrote:
On Fri, Oct 05, 2018 at 11:38:14AM +0200, Andrea Bolognani wrote:
> Warnings printed on stderr -> users and developers will actually
> see them, be annoyed by them, eventually cave in and act upon them.
>
> Warnings written to a log -> nobody will notice them, until one day
> things suddenly stop working apparently out of the blue.
>
> We might pretend that's not the case, but really, it is.
Unless you're talking about a CLI tool (virt-install, virsh), there
is no difference between those two scenarios. For virt-manager,
virt-viewer, oVirt, OpenStack, KubeVirt, stderr is never going to
be seen, it just ends up in a log file. So I don't find that
distinction to be compelling.
Sure, I used "stderr" as a shorthand for "whatever reporting method
can be appropriately used by the application to shove a warning to
the user's face" :)
For a GUI application, it might be a dialog popping up or a message
showing scrolling throuhg the status bar or what have you; for
something headless, it might be an email delivered to the admin's
inbox.
The point is that the user should *not* be required to dig through
logs to find out they've been using deprecated features: they should
be *told* that's the case right when they do.
--
Andrea Bolognani / Red Hat / Virtualization