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Re: [libvirt] [PATCH] udev: should not list bridge devices



On 05/21/2013 10:09 PM, Laine Stump wrote:
On 05/21/2013 09:28 AM, Guannan Ren wrote:
When using udev backend, virsh iface-list outputs bridge devices
like:
  Name                 State      MAC Address
  --------------------------------------------
  em1                  active     e8:39:35:58:d5:94
  lo                   active     00:00:00:00:00:00
  virbr0               active     fe:54:00:a5:f6:42

The patch filters out bridge devices.

---
  src/interface/interface_backend_udev.c | 3 +++
  1 file changed, 3 insertions(+)

diff --git a/src/interface/interface_backend_udev.c b/src/interface/interface_backend_udev.c
index 1fd7d46..92648e8 100644
--- a/src/interface/interface_backend_udev.c
+++ b/src/interface/interface_backend_udev.c
@@ -78,6 +78,9 @@ udevGetDevices(struct udev *udev, virUdevStatus status)
      /* Ignore devices that are part of a bridge */
      udev_enumerate_add_nomatch_sysattr(enumerate, "brport/state", NULL);
+ /* Ignore bridge devices */
+    udev_enumerate_add_nomatch_sysattr(enumerate, "bridge/bridge_id", NULL);
+
NACK. It should list bridge devices. What shouldn't be listed is
*transient* interfaces (such as the bridge devices created by libvirt).

This is a problem inherent in the design of the udev driver. It's
examining the current state of the network system, while the original
intent of libvirt's interface driver was really to examine/modify the
persistent system config.


    Get it, if so, netcf does a right work.
    Thanks for this explanation.


I pointed this out to Doug at the time he
added the udev driver, and he acknowledged the problem but couldn't
think of a simple way to eliminate it, and it didn't seem serious enough
to delay adding in the driver.

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