Re: [PATCH] tools/libxl: improve logging on domain create failure.

[Wei Liu <wei.liu2@citrix.com>]

On Tue, Jan 26, 2016 at 02:38:46PM +0000, Ian Campbell wrote:
> A user reported[0] that xl create failed with just:
>     libxl: error: libxl_create.c:892:initiate_domain_create: Unable to set domain build info defaults
> and some resulting fallout, but without indicating why it was unable
> to set the defaults, even in verbose mode[1].
> 
> Go through libxl__domain_{create,build}_info_setdefault and ensure
> that each error path logs something.
> 
> In most cases this involved simply adding a call to LOG.
> 
> In two cases this involved switching from strdup to
> libxl__strdup(NOGC) and removing the existing error handling.
> 
> When switching from qemu-xen to qemu-xen-traditional (because the
> former is not available) log at level INFO rather than VERBOSE, so
> the message would normally be printed. Also tweak the language here.
> 
> I'm not sure all these messages are reachable (some might be shadowed
> by previous error paths) but it seems better to err on the side of
> caution.
> 
> [0] http://lists.xen.org/archives/html/xen-users/2016-01/msg00125.html
> [1] http://lists.xen.org/archives/html/xen-users/2016-01/msg00129.html
> 
> Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
> Cc: suse.dev@fea.st

Acked-by: Wei Liu <wei.liu2@citrix.com>