From 009c9d6996531ae7a1edce1ceb755e36647cde4e Mon Sep 17 00:00:00 2001
From: Thomas Mangin <thomas.mangin@exa.net.uk>
Date: Tue, 21 Apr 2020 21:29:27 +0100
Subject: vlan: T2361: delete VLAN but not ethernet

---
 python/vyos/ifconfig/ethernet.py  |  5 +----
 python/vyos/ifconfig/interface.py | 32 ++++++++++----------------------
 2 files changed, 11 insertions(+), 26 deletions(-)

diff --git a/python/vyos/ifconfig/ethernet.py b/python/vyos/ifconfig/ethernet.py
index 542de4f59..5b18926c9 100644
--- a/python/vyos/ifconfig/ethernet.py
+++ b/python/vyos/ifconfig/ethernet.py
@@ -40,6 +40,7 @@ class EthernetIf(Interface):
             'bondable': True,
             'broadcast': True,
             'bridgeable': True,
+            'eternal': '(lan|eth|eno|ens|enp|enx)[0-9]+$',
         }
     }
 
@@ -76,10 +77,6 @@ class EthernetIf(Interface):
         },
     }}
 
-    def _delete(self):
-        # Ethernet interfaces can not be removed
-        pass
-
     def get_driver_name(self):
         """
         Return the driver name used by NIC. Some NICs don't support all
diff --git a/python/vyos/ifconfig/interface.py b/python/vyos/ifconfig/interface.py
index 5b26f8bab..62c30dbf7 100644
--- a/python/vyos/ifconfig/interface.py
+++ b/python/vyos/ifconfig/interface.py
@@ -14,6 +14,7 @@
 # License along with this library.  If not, see <http://www.gnu.org/licenses/>.
 
 import os
+import re
 import json
 from copy import deepcopy
 
@@ -63,6 +64,7 @@ class Interface(Control):
         'bondable': False,
         'broadcast': False,
         'bridgeable':  False,
+        'eternal': '',
     }
 
     _command_get = {
@@ -249,28 +251,14 @@ class Interface(Control):
             self.del_addr(addr)
 
         # ---------------------------------------------------------------------
-        # A code refactoring is required as this type check is present as
-        # Interface implement behaviour for one of it's sub-class.
-
-        # It is required as the current pattern for vlan is:
-        # Interface('name').remove() to delete an interface
-        # The code should be modified to have a class method called connect and
-        # have Interface.connect('name').remove()
-
-        # each subclass should register within Interface the pattern for that
-        # interface ie: (ethX, etc.) and use this to create an instance of
-        # the right class (EthernetIf, ...)
-
-        # Ethernet interfaces can not be removed
-
-        # Commented out as nowhere in the code do we call Interface()
-        # This would also cause an import loop
-        # if self.__class__ == EthernetIf:
-        #     return
-
-        # ---------------------------------------------------------------------
-
-        self._delete()
+        # Any class can define an eternal regex in its definition
+        # interface matching the regex will not be deleted
+
+        eternal = self.definition['eternal']
+        if not eternal:
+            self._delete()
+        elif not re.match(eternal, self.ifname):
+            self._delete()
 
     def _delete(self):
         # NOTE (Improvement):
-- 
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