Re: [PATCH 2/2] Report better error message in remoteGetUNIXSocket

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On Tue, Nov 28, 2023 at 13:22:47 +0000, Daniel P. Berrangé wrote:
> On Tue, Nov 28, 2023 at 01:02:40PM +0100, Martin Kletzander wrote:
> > Before this patch users might be confused with the error when no daemon
> > nor systemd socket unit is running due to the error message being a bit
> > vague when running as root with no URI:
> > 
> >   # virsh list
> >   error: failed to connect to the hypervisor
> >   error: Operation not supported: Cannot use direct socket mode if no
> >   URI is set
> > 
> > Instead of merely suggesting to start any daemon, also give a hint as to
> > what socket we have tried looking up:
> > 
> >   # virsh list
> >   error: failed to connect to the hypervisor
> >   error: Operation not supported: Cannot connect to
> >   '/var/run/libvirt/virtqemud-sock' and no URI is set, is any virt
> >   daemon or systemd socket unit started?
> 
> As Peter points out, this is a misleading message because it is
> arbitrarily reporting the first compiled in driver, which may
> be no resemblance to what the user was expecting to run. I think

Exactly. E.g. on Fedora and other distros which enable most features
you'd get:

  error: Operation not supported: Cannot connect to '/var/run/libvirt/virtxend-sock' and no URI is set, is any virt daemon or systemd socket unit started?

And running xen is not what most users want to do when they install
libvirt.

> we should not include the sock path here, but we could include
> the sock *directory*, as that would help diagnose when someone
> built with the wrong install prefix, eg
> 
>   "No active daemon socket found in /var/run/libvirt, and no
>    URI is set. Is any libvirt daemon or socket unit started ?"

This sounds much better. I also don't think we should be putting any
command examples here as suggested by Rich as there isn't a good default
value we could use because of exactly the same reason.
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