9:04 a.m.
Error messages, I like them. I don't like them to be thrown away.
A nice feature of virterror is that it'll throw away errors under the
following conditions:
(1) You are in virConnectOpen, and
(2) You pass a non-NULL virConnectPtr to __virRaiseError.
libvirt has a lot of errors which meet those conditions - the attached
patch fixes the ones I could find.
It also fixes qemuOpenConnection so that it doesn't try to open a Unix
socket with random stack data.
It also adds error messages in some useful places where previously there
was an error, but no message.
Rich.
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7:15 a.m.
On Tue, May 01, 2007 at 03:04:32PM +0100, Richard W.M. Jones wrote:
Error messages, I like them. I don't like them to be thrown
away.
A nice feature of virterror is that it'll throw away errors under the
following conditions:
(1) You are in virConnectOpen, and
(2) You pass a non-NULL virConnectPtr to __virRaiseError.
libvirt has a lot of errors which meet those conditions - the attached
patch fixes the ones I could find.
It also fixes qemuOpenConnection so that it doesn't try to open a Unix
socket with random stack data.
It also adds error messages in some useful places where previously there
was an error, but no message.
In general that looks okay, but instead of passing NULL as the first
argument can't we do a selection in __virRaiseError instead based on the
type of error and just avoid virConnectOpen errors which are not related to
unavailability of the virtualization ?
Daniel
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Daniel Veillard | virtualization library http://libvirt.org/
veillard(a)redhat.com | libxml GNOME XML XSLT toolkit http://xmlsoft.org/
http://veillard.com/ | Rpmfind RPM search engine http://rpmfind.net/
8:31 a.m.
On Wed, May 02, 2007 at 08:15:11AM -0400, Daniel Veillard wrote:
On Tue, May 01, 2007 at 03:04:32PM +0100, Richard W.M. Jones wrote:
> Error messages, I like them. I don't like them to be thrown away.
>
> A nice feature of virterror is that it'll throw away errors under the
> following conditions:
> (1) You are in virConnectOpen, and
> (2) You pass a non-NULL virConnectPtr to __virRaiseError.
>
> libvirt has a lot of errors which meet those conditions - the attached
> patch fixes the ones I could find.
>
> It also fixes qemuOpenConnection so that it doesn't try to open a Unix
> socket with random stack data.
>
> It also adds error messages in some useful places where previously there
> was an error, but no message.
In general that looks okay, but instead of passing NULL as the first
argument can't we do a selection in __virRaiseError instead based on the
type of error and just avoid virConnectOpen errors which are not related to
unavailability of the virtualization ?
That doesn't make sense to me. The issue here is that libvirt has two places
where it stores error details for the caller:
- The global error object
- The per-connection error object
If the virConnectOpen call fails, then the caller has no virConnectPtr object
available. So every codepath in virConnectOpen should be using the global
error object & hence always be passing NULL to __virRaiseError. So I think
Rich's patch is already doing the correct thing AFAICT
Dan.
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12:40 p.m.
This patch has been committed.
Rich.
--
Emerging Technologies, Red Hat http://et.redhat.com/~rjones/
64 Baker Street, London, W1U 7DF Mobile: +44 7866 314 421
Registered Address: Red Hat UK Ltd, Amberley Place, 107-111 Peascod
Street, Windsor, Berkshire, SL4 1TE, United Kingdom.
Registered in England and Wales under Company Registration No. 3798903
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Owens (Ireland)
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3 comments
3 participants
participants (3)
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Daniel P. Berrange -
Daniel Veillard -
Richard W.M. Jones