On Mon, Apr 20, 2020 at 04:20:41PM +0200, Michal Privoznik wrote:
When a device is "move"-d (this basically means it was renamed), we add the new device onto our list but keep the old there too. Fortunately, udev sets this DEVPATH_OLD property which points to the old device path. We can use it to remove the old instance. To test this try renaming an interface, for instance: # ip link set tunl0 name tunl1 # ip link set tunl1 name tunl0 One problem with udev is that it sends old ifname in INTERFACE property, which creates a problem for us, the property is where we get the ifname from and use it then to query all kind of info about the interface. Well, if it is non-existent then we can't query anything. This happens if ifname rename is suppressed (net.ifnames=0 on kernel cmd line for instance). Fortunately, we can use "kernel" source for udev events which has always the fresh info. Signed-off-by: Michal Privoznik <mprivozn@xxxxxxxxxx>
Reviewed-by: Martin Kletzander <mkletzan@xxxxxxxxxx>
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