Ignore non permanenet addresses in udev too

Glean already ignores any interface in sysfs without a permanent address
type. It does this because interfaces with other address types are
likely managed by some other system running on the host like a neutron
agent. Add this exclusion check to the glean udev rules so that we don't
even run glean at all against them.

We have left the check in glean itself as a belts and suspenders check.

Change-Id: I893c873b047a24c0aecd6e2eb49d3f531a71f1b8

glean/cmd.py

@@ -740,7 +740,10 @@ def get_sys_interfaces(interface, args):
 
         mac_addr_type = open(
             '%s/%s/addr_assign_type' % (sys_root, iface), 'r').read().strip()
-        # TODO why? is it not valid to configure randomly assigned mac addrs?
+        # Interfaces without a permanent address are likely created by some
+        # other system on the host like a running neutron agent. In these cases
+        # that system should be responsible for configuring the interface not
+        # glean.
         if mac_addr_type != PERMANENT_ADDR_TYPE:
             continue
         mac = open('%s/%s/address' % (sys_root, iface), 'r').read().strip()

glean/init/glean-udev.rules

@@ -1 +1 @@
-SUBSYSTEM=="net", ACTION=="add", TAG+="systemd", ENV{SYSTEMD_WANTS}+="glean@$name.service"
+SUBSYSTEM=="net", ACTION=="add", ATTR{addr_assign_type}=="0", TAG+="systemd", ENV{SYSTEMD_WANTS}+="glean@$name.service"