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Re: [virt-tools-list] [PATCH] Allow watching for USB devices hotplug and attaching them to VMs

Daniel P. Berrange wrote:
On Thu, Aug 13, 2009 at 09:43:53AM -0400, Michal Novotny wrote:
Hi all,

this is the patch to check for the USB device hotplugging, it currently
allows 2 types of watching for USB device hotplug - using HAL and udev
itself. There is a plan for DeviceKit support but I am not currently
having option to make it for DeviceKit so this option will be added in
time. Nevertheless the HAL and udev implementations are working now
but you may have to choose the desired type in the Preferences menu.
UDev type is working by watching for /dev tree changes using pyinotify
and querying udevadm so if you want to use udev type, you need to have
pyinotify module installed.

Talking directly to HAL, DeviceKit or sysfs from virt-manager is not
really that nice. virt-manager has done this in the past, but we've
wanted to move all this functionality into libvirt itself, since that's
the only way it will be able to work for remove hypervisors. libvirt
already exposes information about all host USB devices. All that's
missing is an API that notifies you when one is created/deleted, so
you can avoid polling on libvirt all the time.
Hi Daniel,
if you would like to add notification support for libvirt you should talk with HAL/DeviceKit directly and you can also use INotify for catching the directory changes in the /dev tree if no connection is available to HAL/DeviceKit at all but udev is available. Also, one more thing is that if you would like to use DeviceKit you need to link libvirt with gnome-disk-utility (gdu) - I've been talking with a guy working in Desktop Team in our office and this is what I've been told. GDU libraries are not available in Fedora 10 installation if you don't YUM the DeviceKit* packages, also the API have changed much since that time (based on what I've been told) so if you would like to add this to libvirt, older versions of Fedora (like Fedora 10) won't work because there is no gdu library (which can be yummed with some deprecated API to Fedora 10) so if you want to add this to libvirt directly, you should add option --without-gdu to configure script. According to what I've been told GDU have dependencies to glib-2.0 and DeviceKit packages but I think only linking with -lgdu is OK.

So would you like to add this support to libvirt itself which would obsolete my patch?


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