[Libvir] PATCH: More useful error messages with missing certs

[Richard W.M. Jones]

Daniel P. Berrange wrote:
> On the server end if you try to start the server with TLS enabled and you
> don't have the certs setup, you get a cryptic:
> 
> gnutls_certificate_set_x509_trust_file: Error while reading file.
> 
> Rather useless the gnutls error message not telling you what file was
> missing.
> 
> Similarly with virsh:
> 
>  # ~/usr/bin/virsh  --connect  qemu://localhost/system list
>  libvir: Remote error : Error while reading file.
> 
> Since GNU TLS doesn't even tell you the actual problem - was it wrong
> permissions, or missing file altogether, I decided its better to do an
> explicit 'stat' check ahead of time.

+1

Rich.

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