ethernet: support testing via SSH

Instead of running the smoketest on all available interfaces it is now possible
to specify a whitespace separated list as environment variable where the test
is performed. This is especially usefull when developing/testing via SSH and
to limit the test to an interface you are not connected to.

Test only with interface eth1:
$ TEST_ETH='eth1' /usr/libexec/vyos/tests/smoke/cli/test_interfaces_ethernet.py

2 files changed, 12 insertions, 5 deletions

diff --git a/scripts/cli/base_interfaces_test.py b/scripts/cli/base_interfaces_test.py
index 53fe553bc..00a6f16e4 100644
--- a/scripts/cli/base_interfaces_test.py
+++ b/scripts/cli/base_interfaces_test.py
@@ -38,8 +38,11 @@ class BasicInterfaceTest:
         def tearDown(self):
             # we should not remove ethernet from the overall CLI
             if 'ethernet' in self._base_path:
-                self.session.delete(self._base_path)
                 for intf in self._interfaces:
+                    # when using a dedicated interface to test via TEST_ETH environment
+                    # variable only this one will be cleared in the end - usable to test
+                    # ethernet interfaces via SSH
+                    self.session.delete(self._base_path + [intf])
                     self.session.set(self._base_path + [intf])
             else:
                 self.session.delete(self._base_path)
diff --git a/scripts/cli/test_interfaces_ethernet.py b/scripts/cli/test_interfaces_ethernet.py
index 373c81680..919caab8c 100755
--- a/scripts/cli/test_interfaces_ethernet.py
+++ b/scripts/cli/test_interfaces_ethernet.py
@@ -14,6 +14,7 @@
 # You should have received a copy of the GNU General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
+import os
 import unittest
 
 from base_interfaces_test import BasicInterfaceTest
@@ -29,10 +30,13 @@ class EthernetInterfaceTest(BasicInterfaceTest.BaseTest):
 
         # we need to filter out VLAN interfaces identified by a dot (.)
         # in their name - just in case!
-        for tmp in Section.interfaces("ethernet"):
-            if not '.' in tmp:
-                self._interfaces.append(tmp)
-
+        if 'TEST_ETH' in os.environ:
+            tmp = os.environ['TEST_ETH'].split()
+            self._interfaces = tmp
+        else:
+            for tmp in Section.interfaces("ethernet"):
+                if not '.' in tmp:
+                    self._interfaces.append(tmp)
 
 if __name__ == '__main__':
     unittest.main()