[libvirt] [PATCH] daemon: Add early libvirtd start verbose errors.

[Daniel P. Berrange]

On Thu, Aug 11, 2011 at 02:18:15PM +0200, Peter Krempa wrote:
> Early errors during start of libvirtd didn't have
> an error reporting mechanism and caused libvirtd
> to exit silently (only the return value indicated
> an error). This patch adds error messages printed
> to stderr if verbose parameter is specified to the
> daemon.
> 
> fixes: https://bugzilla.redhat.com/show_bug.cgi?id=728654
> ---
>  daemon/libvirtd.c |   40 ++++++++++++++++++++++++++++++++--------
>  1 files changed, 32 insertions(+), 8 deletions(-)

Part of the problem I see here is that we don't initialized the
libvirt logging framework until quite late in startup sequence,
due to the need to the read the config file.

If we added a call to virLogSetFromEnv() right at the start of
libvirtd, then we'd get a basic logging setup activated, and
so can just use  VIR_ERROR everywhere, instead of a mixture
of fprintf(stderr) and VIR_ERROR. The default logging setup
for VIR_ERROR will printf to stderr anyway.

This will mean you can override the logging destination from
environment variables more effectively.

Regards,
Daniel
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