[PATCH 1/1] Fix adding ports to OVS bridges without VLAN tags

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The introduction of the new VLAN code, along with the fix
from 5e465df6be8bcb00f0b4bff831e91f4042fae272, caused the
addition of OVS ports to fail with the following message:

ovs-vsctl: 00002|vsctl|ERR|: missing column name

This fix takes into account the VLAN arguments are optional,
and correctly sets up the command line to run the "ovs-vsctl"
command to add ports to the OVS bridge.

Signed-off-by: Kyle Mestery <kmestery@xxxxxxxxx>
---
 src/util/virnetdevopenvswitch.c | 13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)

diff --git a/src/util/virnetdevopenvswitch.c b/src/util/virnetdevopenvswitch.c
index 00271a0..fcf6d91 100644
--- a/src/util/virnetdevopenvswitch.c
+++ b/src/util/virnetdevopenvswitch.c
@@ -104,9 +104,15 @@ int virNetDevOpenvswitchAddPort(const char *brname, const char *ifname,
     }
 
     cmd = virCommandNew(OVSVSCTL);
+
+    virCommandAddArgList(cmd, "--", "--may-exist", "add-port",
+                        brname, ifname, NULL);
+
+    if (virBufferCurrentContent(&buf) != "")
+        virCommandAddArgList(cmd, virBufferCurrentContent(&buf), NULL);
+
     if (ovsport->profileID[0] == '\0') {
-        virCommandAddArgList(cmd, "--", "--may-exist", "add-port",
-                        brname, ifname, virBufferCurrentContent(&buf),
+        virCommandAddArgList(cmd,
                         "--", "set", "Interface", ifname, attachedmac_ex_id,
                         "--", "set", "Interface", ifname, ifaceid_ex_id,
                         "--", "set", "Interface", ifname, vmid_ex_id,
@@ -114,8 +120,7 @@ int virNetDevOpenvswitchAddPort(const char *brname, const char *ifname,
                         "external-ids:iface-status=active",
                         NULL);
     } else {
-        virCommandAddArgList(cmd, "--", "--may-exist", "add-port",
-                        brname, ifname, virBufferCurrentContent(&buf),
+        virCommandAddArgList(cmd,
                         "--", "set", "Interface", ifname, attachedmac_ex_id,
                         "--", "set", "Interface", ifname, ifaceid_ex_id,
                         "--", "set", "Interface", ifname, vmid_ex_id,
-- 
1.7.11.4

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