4:16 a.m.
Attached is a simple patch to fix a problem I ran into when using the
ruby-libvirt bindings with libvirt 0.4.3. Basically, if you call any of the
virConnectList* functions with a "max" of 0, it returns "Invalid Arg".
To get
around this, modify the ruby-libvirt bindings to return an empty list if we get
num == 0 when calling the corresponding virConnectNumOf* function. This should
solve: https://bugzilla.redhat.com/show_bug.cgi?id=451666
Signed-off-by: Chris Lalancette <clalance(a)redhat.com>
4:49 a.m.
On Tue, Jun 17, 2008 at 11:16:31AM +0200, Chris Lalancette wrote:
Attached is a simple patch to fix a problem I ran into when using
the
ruby-libvirt bindings with libvirt 0.4.3. Basically, if you call any of the
virConnectList* functions with a "max" of 0, it returns "Invalid
Arg". To get
around this, modify the ruby-libvirt bindings to return an empty list if we get
num == 0 when calling the corresponding virConnectNumOf* function. This should
solve: https://bugzilla.redhat.com/show_bug.cgi?id=451666
That doesn't sound proper to me. I re-checked, all virConnectList* functions
in libvirt.c raise with an error only if the connection is invalid, if
the pointer to the storage is NULL or if the max value is < 0. the max value
being 0 should be accepted, that's the semantic of the check done on top
of the driver. So what driver did fail with an argument error ? this need
to be fixed.
This looks okay in the QEmu driver from what I saw
xenHypervisorListDomains seems to need fixing.
xenDaemonListDomains need to be fixed too.
xenDaemonListDefinedDomains need to be fixed too.
The OpenVZ driver looks okay
The LXC driver looks okay
The remote driver seems okay but it's harder for me to assert it works
through the full chain.
Patch for the Xen parts attached.
Could you try to investigate and find more precisely under what conditions
you got the 'max = 0' returning an invalid arg error, we need to find this
fix it not work around it at the binding level IMHO,
Daniel
--
Red Hat Virtualization group http://redhat.com/virtualization/
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/
5 a.m.
On Tue, Jun 17, 2008 at 11:16:31AM +0200, Chris Lalancette wrote:
Attached is a simple patch to fix a problem I ran into when using
the
ruby-libvirt bindings with libvirt 0.4.3. Basically, if you call any of the
virConnectList* functions with a "max" of 0, it returns "Invalid
Arg". To get
around this, modify the ruby-libvirt bindings to return an empty list if we get
num == 0 when calling the corresponding virConnectNumOf* function. This should
solve: https://bugzilla.redhat.com/show_bug.cgi?id=451666
Hum, looking at the bugzilla it's for storage that the problem was raised.
It's a bit annoying, the main domain and network functions accept a max = 0
The documentation of virConnectListDefinedStoragePools doesn't prevent
maxnames = 0
Actually the check done in the function is
if ((names == NULL) || (maxnames < 0))
i.e. it allows 0, and pass it to the underlying driver. One solution
would be to just return 0 there, as attached in this patch, the other
solution would be to check which underlying storage driver failed and
fix it,
Daniel
--
Red Hat Virtualization group http://redhat.com/virtualization/
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/
3:53 a.m.
New subject: [libvirt] [PATCH]: fix ruby-libvirt bindings when virConnectNum* returns 0
Daniel Veillard wrote:
Hum, looking at the bugzilla it's for storage that the problem
was raised.
It's a bit annoying, the main domain and network functions accept a max = 0
The documentation of virConnectListDefinedStoragePools doesn't prevent
maxnames = 0
Actually the check done in the function is
if ((names == NULL) || (maxnames < 0))
i.e. it allows 0, and pass it to the underlying driver. One solution
would be to just return 0 there, as attached in this patch, the other
solution would be to check which underlying storage driver failed and
fix it,
Right. After going through this, I found out that it is actually a NULL check
firing, not a 0 check (see my posted patch for details). That being said, a
patch of the type posted here might be worthwhile; it would short-circuit the
rest of the calls through the stack, and in particular would avoid on-the-wire
calls in the remote case, to do essentially no work. I think it would be a nice
optimization for all of the List type operations, but not necessarily required.
Chris Lalancette
3:10 p.m.
New subject: [libvirt] Re: [PATCH]: fix ruby-libvirt bindings when virConnectNum* returns 0
On Tue, 2008-06-17 at 11:16 +0200, Chris Lalancette wrote:
Attached is a simple patch to fix a problem I ran into when using
the
ruby-libvirt bindings with libvirt 0.4.3. Basically, if you call any of the
virConnectList* functions with a "max" of 0, it returns "Invalid
Arg". To get
around this, modify the ruby-libvirt bindings to return an empty list if we get
num == 0 when calling the corresponding virConnectNumOf* function. This should
solve: https://bugzilla.redhat.com/show_bug.cgi?id=451666
Signed-off-by: Chris Lalancette <clalance(a)redhat.com>
I committed the patch with a couple more places to shortcircuit added.
Making a release and pushing an update will likely have to wait till
next week.
David
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David Lutterkort