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Re: [libvirt] [PATCH] Support reporting live interface IP/netmask.



On 10/05/2009 07:02 AM, Daniel P. Berrange wrote:
On Tue, Sep 29, 2009 at 04:02:30PM -0400, Laine Stump wrote:
From: root<root vlap laine org>

This patch adds the flag VIR_INTERFACE_XML_INACTIVE to
virInterfaceGetXMLDesc's flags. When it is *not* set (the default),
the live interface info will be returned in the XML. in particular,
the IP address(es) and netmask(s) will be retrieved by querying the
device directly, rather than just reporting what's in the config
file. The backend of this is in netcf's new ncf_if_xml_state()
function.

Any live interface ip address info in the xml will have the property
"source" set to "device", eg:

          <ip address='10.24.0.1' prefix='24' source='device'/>
This new 'source' attribute is bogus. The fact that the XML is the
showing the device details, and not the config file details is
inherent in the fact that we're querying the live interface. This
distinction applies to the entire XML dump, not just the<ip>  tag.

The 'source' attribute came out of the exchange at the bottom of these messages:

https://fedorahosted.org/pipermail/netcf-devel/2009-September/000258.html
https://fedorahosted.org/pipermail/netcf-devel/2009-September/000259.html
https://fedorahosted.org/pipermail/netcf-devel/2009-September/000260.html

(I included all the messages in case too much context was removed in the replies).

Some/most of the stuff in the XML still comes from the config files even though we're querying the "live interface', because some info isn't available reliably in any other way (for example, it's useful to know that dhcp is setup for the interface, but I don't believe there's any way to query dhclient to see if that truly is the case). The idea was to put some sort of tag on the particular items that were really coming from the device. I will say that, if nothing else, having this extra attribute has mmade it easier for me to verify that my patches are actually doing something ;-) In the end, I looked at it kindly because it didn't seem to hurt anything (most people just ignore extra stuff in the xml), and might help someone.

This attribute is already in the latest netcf release, but of course if required we could ignore it in libvirt (it would be a shame to have netcf and libvirt's xml diverge so soon, though. I figured we'd get at least a year or so before we had to start worring about that :-/)



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