Don't use root_helper when it's not needed

LinuxBridge agent doesn't need to use root_helper when checking if
a device exists. Root priviledges are required to perform operations
inside a namespace and it's not the case here.

Change-Id: I12e0cde2f4dd3b3f8e7f5ed9e90e2805a4466aaa
Closes-bug: #1305800

diff --git a/neutron/plugins/linuxbridge/agent/linuxbridge_neutron_agent.py b/neutron/plugins/linuxbridge/agent/linuxbridge_neutron_agent.py
index 5d215791a6574f638ac8ea659a2c6536c54f6944..90dbd451b1daf16073513f5c006dba61de8da90d 100755 (executable)
--- a/neutron/plugins/linuxbridge/agent/linuxbridge_neutron_agent.py
+++ b/neutron/plugins/linuxbridge/agent/linuxbridge_neutron_agent.py
@@ -132,7 +132,7 @@ class LinuxBridgeManager:
         return neutron_bridge_list
 
     def get_interfaces_on_bridge(self, bridge_name):
-        if ip_lib.device_exists(bridge_name, root_helper=self.root_helper):
+        if ip_lib.device_exists(bridge_name):
             bridge_interface_path = BRIDGE_INTERFACES_FS.replace(
                 BRIDGE_NAME_PLACEHOLDER, bridge_name)
             return os.listdir(bridge_interface_path)
@@ -214,7 +214,7 @@ class LinuxBridgeManager:
     def ensure_vlan(self, physical_interface, vlan_id):
         """Create a vlan unless it already exists."""
         interface = self.get_subinterface_name(physical_interface, vlan_id)
-        if not ip_lib.device_exists(interface, root_helper=self.root_helper):
+        if not ip_lib.device_exists(interface):
             LOG.debug(_("Creating subinterface %(interface)s for "
                         "VLAN %(vlan_id)s on interface "
                         "%(physical_interface)s"),
@@ -234,7 +234,7 @@ class LinuxBridgeManager:
     def ensure_vxlan(self, segmentation_id):
         """Create a vxlan unless it already exists."""
         interface = self.get_vxlan_device_name(segmentation_id)
-        if not ip_lib.device_exists(interface, root_helper=self.root_helper):
+        if not ip_lib.device_exists(interface):
             LOG.debug(_("Creating vxlan interface %(interface)s for "
                         "VNI %(segmentation_id)s"),
                       {'interface': interface,
@@ -380,8 +380,7 @@ class LinuxBridgeManager:
         If a VIF has been plugged into a network, this function will
         add the corresponding tap device to the relevant bridge.
         """
-        if not ip_lib.device_exists(tap_device_name,
-                                    root_helper=self.root_helper):
+        if not ip_lib.device_exists(tap_device_name):
             LOG.debug(_("Tap device: %s does not exist on "
                         "this host, skipped"), tap_device_name)
             return False
@@ -425,7 +424,7 @@ class LinuxBridgeManager:
                                       tap_device_name)
 
     def delete_vlan_bridge(self, bridge_name):
-        if ip_lib.device_exists(bridge_name, root_helper=self.root_helper):
+        if ip_lib.device_exists(bridge_name):
             interfaces_on_bridge = self.get_interfaces_on_bridge(bridge_name)
             for interface in interfaces_on_bridge:
                 self.remove_interface(bridge_name, interface)
@@ -468,7 +467,7 @@ class LinuxBridgeManager:
                 del self.network_map[network_id]
 
     def remove_interface(self, bridge_name, interface_name):
-        if ip_lib.device_exists(bridge_name, root_helper=self.root_helper):
+        if ip_lib.device_exists(bridge_name):
             if not self.is_device_on_bridge(interface_name):
                 return True
             LOG.debug(_("Removing device %(interface_name)s from bridge "
@@ -491,7 +490,7 @@ class LinuxBridgeManager:
             return False
 
     def delete_vlan(self, interface):
-        if ip_lib.device_exists(interface, root_helper=self.root_helper):
+        if ip_lib.device_exists(interface):
             LOG.debug(_("Deleting subinterface %s for vlan"), interface)
             if utils.execute(['ip', 'link', 'set', interface, 'down'],
                              root_helper=self.root_helper):
@@ -502,7 +501,7 @@ class LinuxBridgeManager:
             LOG.debug(_("Done deleting subinterface %s"), interface)
 
     def delete_vxlan(self, interface):
-        if ip_lib.device_exists(interface, root_helper=self.root_helper):
+        if ip_lib.device_exists(interface):
             LOG.debug(_("Deleting vxlan interface %s for vlan"),
                       interface)
             int_vxlan = self.ip.device(interface)
@@ -540,8 +539,7 @@ class LinuxBridgeManager:
             return False
         for segmentation_id in range(1, constants.MAX_VXLAN_VNI + 1):
             if not ip_lib.device_exists(
-                    self.get_vxlan_device_name(segmentation_id),
-                    root_helper=self.root_helper):
+                    self.get_vxlan_device_name(segmentation_id)):
                 break
         else:
             LOG.error(_('No valid Segmentation ID to perform UCAST test.'))