move ifupdown2/* .

ifupdown2 code was one level deeper because ifupdown2 initially
had ifupdown2 and ifupdown2-addons as two separate packages.
Since they were combined into one package, it makes sense to
move all combined code under the top level directory

Signed-off-by: Roopa Prabhu <roopa@cumulusnetworks.com>

addons/loopback.py

@@ -0,0 +1,63 @@
+#!/usr/bin/python
+
+# This should be pretty simple and might not really even need to exist.
+# The key is that we need to call link_create with a type of "dummy"
+# since that will translate to 'ip link add loopbackX type dummy'
+# The config file should probably just indicate that the type is
+# loopback or dummy.
+
+from ifupdown.iface import *
+from ifupdownaddons.modulebase import moduleBase
+from ifupdownaddons.iproute2 import iproute2
+import logging
+
+class loopback(moduleBase):
+    _modinfo = {'mhelp' : 'configure extra loopback module based on ' +
+			  'dummy device' }
+
+    def __init__(self, *args, **kargs):
+        moduleBase.__init__(self, *args, **kargs)
+        self.ipcmd = None
+
+    def _is_loopback_by_name(self, ifacename):
+        return 'loop' in ifacename
+
+    def _up(self, ifaceobj):
+        if self._is_loopback_by_name(ifaceobj.name):
+           self.ipcmd.link_create(ifaceobj.name, 'dummy')
+
+    def _down(self, ifaceobj):
+        if not self.PERFMODE and not self.ipcmd.link_exists(ifaceobj.name):
+           return
+        try:
+            self.ipcmd.link_delete(ifaceobj.name)
+        except Exception as e:
+            self.log_warn(str(e))
+
+    def _query_check(self, ifaceobj, ifaceobjcurr):
+        if not self.ipcmd.link_exists(ifaceobj.name):
+           return
+
+    _run_ops = {'pre-up' : _up,
+               'post-down' : _down,
+               'query-checkcurr' : _query_check}
+
+    def get_ops(self):
+        return self._run_ops.keys()
+
+    def _init_command_handlers(self):
+        if not self.ipcmd:
+            self.ipcmd = iproute2(**self.get_flags())
+
+    def run(self, ifaceobj, operation, query_ifaceobj=None, **extra_args):
+        op_handler = self._run_ops.get(operation)
+        if not op_handler:
+            return
+        if (operation != 'query-running' and
+                not self._is_loopback_by_name(ifaceobj.name)):
+            return
+        self._init_command_handlers()
+        if operation == 'query-checkcurr':
+            op_handler(self, ifaceobj, query_ifaceobj)
+        else:
+            op_handler(self, ifaceobj)