smoketest: refactor setUp() for all interface based testcases

It does not make sense (at all!) to re-initialize the entire class with every
call to setUp(). We neither change the enabled/disabled tastcases dynamically,
not do we adjust the testinterfaces during a run.

Remove the runtime overhead and place one-time init calls into setUpClass()
instead.

(cherry picked from commit b48890396dcff074d1e9336ca1db9d3eafe2a12f)

14 files changed, 135 insertions, 147 deletions

diff --git a/smoketest/scripts/cli/test_interfaces_bonding.py b/smoketest/scripts/cli/test_interfaces_bonding.py
index 560bfb92b..234992b23 100755
--- a/smoketest/scripts/cli/test_interfaces_bonding.py
+++ b/smoketest/scripts/cli/test_interfaces_bonding.py
@@ -25,33 +25,31 @@ from vyos.configsession import ConfigSessionError
 from vyos.util import read_file
 
 class BondingInterfaceTest(BasicInterfaceTest.BaseTest):
-    def setUp(self):
-        self._test_ip = True
-        self._test_ipv6 = True
-        self._test_ipv6_pd = True
-        self._test_mtu = True
-        self._test_vlan = True
-        self._test_qinq = True
-        self._base_path = ['interfaces', 'bonding']
-        self._interfaces = ['bond0']
-        self._mirror_interfaces = ['dum21354']
-        self._members = []
+    @classmethod
+    def setUpClass(cls):
+        cls._test_ip = True
+        cls._test_ipv6 = True
+        cls._test_ipv6_pd = True
+        cls._test_mtu = True
+        cls._test_vlan = True
+        cls._test_qinq = True
+        cls._base_path = ['interfaces', 'bonding']
+        cls._interfaces = ['bond0']
+        cls._mirror_interfaces = ['dum21354']
+        cls._members = []
 
         # we need to filter out VLAN interfaces identified by a dot (.)
         # in their name - just in case!
         if 'TEST_ETH' in os.environ:
-            self._members = os.environ['TEST_ETH'].split()
+            cls._members = os.environ['TEST_ETH'].split()
         else:
-            for tmp in Section.interfaces("ethernet"):
+            for tmp in Section.interfaces('ethernet'):
                 if not '.' in tmp:
-                    self._members.append(tmp)
-
-        self._options['bond0'] = []
-        for member in self._members:
-            self._options['bond0'].append(f'member interface {member}')
-
-        super().setUp()
+                    cls._members.append(tmp)
 
+        cls._options['bond0'] = []
+        for member in cls._members:
+            cls._options['bond0'].append(f'member interface {member}')
 
     def test_add_single_ip_address(self):
         super().test_add_single_ip_address()
diff --git a/smoketest/scripts/cli/test_interfaces_bridge.py b/smoketest/scripts/cli/test_interfaces_bridge.py
index 464226b6f..854d870be 100755
--- a/smoketest/scripts/cli/test_interfaces_bridge.py
+++ b/smoketest/scripts/cli/test_interfaces_bridge.py
@@ -27,31 +27,29 @@ from vyos.util import cmd
 from vyos.util import read_file
 
 class BridgeInterfaceTest(BasicInterfaceTest.BaseTest):
-    def setUp(self):
-        self._test_ip = True
-        self._test_ipv6 = True
-        self._test_ipv6_pd = True
-        self._test_vlan = True
-        self._test_qinq = True
-        self._base_path = ['interfaces', 'bridge']
-        self._mirror_interfaces = ['dum21354']
-        self._members = []
+    @classmethod
+    def setUpClass(cls):
+        cls._test_ip = True
+        cls._test_ipv6 = True
+        cls._test_ipv6_pd = True
+        cls._test_vlan = True
+        cls._base_path = ['interfaces', 'bridge']
+        cls._mirror_interfaces = ['dum21354']
+        cls._members = []
 
         # we need to filter out VLAN interfaces identified by a dot (.)
         # in their name - just in case!
         if 'TEST_ETH' in os.environ:
-            self._members = os.environ['TEST_ETH'].split()
+            cls._members = os.environ['TEST_ETH'].split()
         else:
-            for tmp in Section.interfaces("ethernet"):
+            for tmp in Section.interfaces('ethernet'):
                 if not '.' in tmp:
-                    self._members.append(tmp)
+                    cls._members.append(tmp)
 
-        self._options['br0'] = []
-        for member in self._members:
-            self._options['br0'].append(f'member interface {member}')
-        self._interfaces = list(self._options)
-
-        super().setUp()
+        cls._options['br0'] = []
+        for member in cls._members:
+            cls._options['br0'].append(f'member interface {member}')
+        cls._interfaces = list(cls._options)
 
     def test_add_remove_bridge_member(self):
         # Add member interfaces to bridge and set STP cost/priority
diff --git a/smoketest/scripts/cli/test_interfaces_dummy.py b/smoketest/scripts/cli/test_interfaces_dummy.py
index 60465a1d5..6e462bccf 100755
--- a/smoketest/scripts/cli/test_interfaces_dummy.py
+++ b/smoketest/scripts/cli/test_interfaces_dummy.py
@@ -19,10 +19,10 @@ import unittest
 from base_interfaces_test import BasicInterfaceTest
 
 class DummyInterfaceTest(BasicInterfaceTest.BaseTest):
-    def setUp(self):
-        self._base_path = ['interfaces', 'dummy']
-        self._interfaces = ['dum435', 'dum8677', 'dum0931', 'dum089']
-        super().setUp()
+    @classmethod
+    def setUpClass(cls):
+        cls._base_path = ['interfaces', 'dummy']
+        cls._interfaces = ['dum435', 'dum8677', 'dum0931', 'dum089']
 
 if __name__ == '__main__':
     unittest.main(verbosity=2)
diff --git a/smoketest/scripts/cli/test_interfaces_ethernet.py b/smoketest/scripts/cli/test_interfaces_ethernet.py
index 9d896f690..623a8887c 100755
--- a/smoketest/scripts/cli/test_interfaces_ethernet.py
+++ b/smoketest/scripts/cli/test_interfaces_ethernet.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python3
 #
-# Copyright (C) 2020 VyOS maintainers and contributors
+# Copyright (C) 2020-2021 VyOS maintainers and contributors
 #
 # This program is free software; you can redistribute it and/or modify
 # it under the terms of the GNU General Public License version 2 or later as
@@ -35,37 +35,30 @@ def get_wpa_supplicant_value(interface, key):
     return tmp[0]
 
 class EthernetInterfaceTest(BasicInterfaceTest.BaseTest):
-    def setUp(self):
-        self._test_ip = True
-        self._test_ipv6 = True
-        self._test_ipv6_pd = True
-        self._test_mtu = True
-        self._test_vlan = True
-        self._test_qinq = True
-        self._base_path = ['interfaces', 'ethernet']
-        self._mirror_interfaces = ['dum21354']
+    @classmethod
+    def setUpClass(cls):
+        cls._test_ip = True
+        cls._test_ipv6 = True
+        cls._test_ipv6_pd = True
+        cls._test_mtu = True
+        cls._test_vlan = True
+        cls._test_qinq = True
+        cls._base_path = ['interfaces', 'ethernet']
+        cls._mirror_interfaces = ['dum21354']
 
         # we need to filter out VLAN interfaces identified by a dot (.)
         # in their name - just in case!
         if 'TEST_ETH' in os.environ:
             tmp = os.environ['TEST_ETH'].split()
-            self._interfaces = tmp
+            cls._interfaces = tmp
         else:
-            for tmp in Section.interfaces("ethernet"):
+            for tmp in Section.interfaces('ethernet'):
                 if not '.' in tmp:
-                    self._interfaces.append(tmp)
+                    cls._interfaces.append(tmp)
 
-        self._macs = {}
-        for interface in self._interfaces:
-            try:
-                mac = self.session.show_config(self._base_path +
-                                               [interface, 'hw-id']).split()[1]
-            except:
-                # during initial system startup there is no hw-id node
-                mac = read_file(f'/sys/class/net/{interface}/address')
-            self._macs[interface] = mac
-
-        super().setUp()
+        cls._macs = {}
+        for interface in cls._interfaces:
+            cls._macs[interface] = read_file(f'/sys/class/net/{interface}/address')
 
 
     def tearDown(self):
@@ -101,8 +94,7 @@ class EthernetInterfaceTest(BasicInterfaceTest.BaseTest):
 
         # Validate interface state
         for interface in self._interfaces:
-            with open(f'/sys/class/net/{interface}/flags', 'r') as f:
-                flags = f.read()
+            flags = read_file(f'/sys/class/net/{interface}/flags')
             self.assertEqual(int(flags, 16) & 1, 0)
 
     def test_offloading_rps(self):
diff --git a/smoketest/scripts/cli/test_interfaces_geneve.py b/smoketest/scripts/cli/test_interfaces_geneve.py
index 12cded400..b708b5437 100755
--- a/smoketest/scripts/cli/test_interfaces_geneve.py
+++ b/smoketest/scripts/cli/test_interfaces_geneve.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python3
 #
-# Copyright (C) 2020 VyOS maintainers and contributors
+# Copyright (C) 2020-2021 VyOS maintainers and contributors
 #
 # This program is free software; you can redistribute it and/or modify
 # it under the terms of the GNU General Public License version 2 or later as
@@ -20,16 +20,16 @@ from vyos.configsession import ConfigSession
 from base_interfaces_test import BasicInterfaceTest
 
 class GeneveInterfaceTest(BasicInterfaceTest.BaseTest):
-    def setUp(self):
-        self._test_ip = True
-        self._test_ipv6 = True
-        self._base_path = ['interfaces', 'geneve']
-        self._options = {
+    @classmethod
+    def setUpClass(cls):
+        cls._test_ip = True
+        cls._test_ipv6 = True
+        cls._base_path = ['interfaces', 'geneve']
+        cls._options = {
             'gnv0': ['vni 10', 'remote 127.0.1.1'],
             'gnv1': ['vni 20', 'remote 127.0.1.2'],
         }
-        self._interfaces = list(self._options)
-        super().setUp()
+        cls._interfaces = list(cls._options)
 
 if __name__ == '__main__':
     unittest.main(verbosity=2)
diff --git a/smoketest/scripts/cli/test_interfaces_l2tpv3.py b/smoketest/scripts/cli/test_interfaces_l2tpv3.py
index 81af6d7f4..a89895b92 100755
--- a/smoketest/scripts/cli/test_interfaces_l2tpv3.py
+++ b/smoketest/scripts/cli/test_interfaces_l2tpv3.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python3
 #
-# Copyright (C) 2020 VyOS maintainers and contributors
+# Copyright (C) 2020-2021 VyOS maintainers and contributors
 #
 # This program is free software; you can redistribute it and/or modify
 # it under the terms of the GNU General Public License version 2 or later as
@@ -21,11 +21,12 @@ from base_interfaces_test import BasicInterfaceTest
 from vyos.util import cmd
 
 class GeneveInterfaceTest(BasicInterfaceTest.BaseTest):
-    def setUp(self):
-        self._test_ip = True
-        self._test_ipv6 = True
-        self._base_path = ['interfaces', 'l2tpv3']
-        self._options = {
+    @classmethod
+    def setUpClass(cls):
+        cls._test_ip = True
+        cls._test_ipv6 = True
+        cls._base_path = ['interfaces', 'l2tpv3']
+        cls._options = {
             'l2tpeth10': ['local-ip 127.0.0.1', 'remote-ip 127.10.10.10',
                           'tunnel-id 100', 'peer-tunnel-id 10',
                           'session-id 100', 'peer-session-id 10',
@@ -35,8 +36,7 @@ class GeneveInterfaceTest(BasicInterfaceTest.BaseTest):
                           'session-id 20', 'tunnel-id 200',
                           'source-port 2020', 'destination-port 20202'],
         }
-        self._interfaces = list(self._options)
-        super().setUp()
+        cls._interfaces = list(cls._options)
 
     def test_add_single_ip_address(self):
         super().test_add_single_ip_address()
diff --git a/smoketest/scripts/cli/test_interfaces_loopback.py b/smoketest/scripts/cli/test_interfaces_loopback.py
index 36000c3ff..77dd4c1b5 100755
--- a/smoketest/scripts/cli/test_interfaces_loopback.py
+++ b/smoketest/scripts/cli/test_interfaces_loopback.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python3
 #
-# Copyright (C) 2020 VyOS maintainers and contributors
+# Copyright (C) 2020-2021 VyOS maintainers and contributors
 #
 # This program is free software; you can redistribute it and/or modify
 # it under the terms of the GNU General Public License version 2 or later as
@@ -21,13 +21,13 @@ from netifaces import interfaces
 
 from vyos.validate import is_intf_addr_assigned
 
+loopbacks = ['127.0.0.1', '::1']
+
 class LoopbackInterfaceTest(BasicInterfaceTest.BaseTest):
-    def setUp(self):
-         super().setUp()
-         # these addresses are never allowed to be removed from the system
-         self._loopback_addresses = ['127.0.0.1', '::1']
-         self._base_path = ['interfaces', 'loopback']
-         self._interfaces = ['lo']
+    @classmethod
+    def setUpClass(cls):
+         cls._base_path = ['interfaces', 'loopback']
+         cls._interfaces = ['lo']
 
     def tearDown(self):
         self.session.delete(self._base_path)
@@ -40,12 +40,12 @@ class LoopbackInterfaceTest(BasicInterfaceTest.BaseTest):
 
     def test_add_single_ip_address(self):
         super().test_add_single_ip_address()
-        for addr in self._loopback_addresses:
+        for addr in loopbacks:
             self.assertTrue(is_intf_addr_assigned('lo', addr))
 
     def test_add_multiple_ip_addresses(self):
         super().test_add_multiple_ip_addresses()
-        for addr in self._loopback_addresses:
+        for addr in loopbacks:
             self.assertTrue(is_intf_addr_assigned('lo', addr))
 
     def test_interface_disable(self):
diff --git a/smoketest/scripts/cli/test_interfaces_macsec.py b/smoketest/scripts/cli/test_interfaces_macsec.py
index 89743e5fd..3a3e7bff3 100755
--- a/smoketest/scripts/cli/test_interfaces_macsec.py
+++ b/smoketest/scripts/cli/test_interfaces_macsec.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python3
 #
-# Copyright (C) 2020 VyOS maintainers and contributors
+# Copyright (C) 2020-2021 VyOS maintainers and contributors
 #
 # This program is free software; you can redistribute it and/or modify
 # it under the terms of the GNU General Public License version 2 or later as
@@ -31,19 +31,19 @@ def get_config_value(interface, key):
     return tmp[0]
 
 class MACsecInterfaceTest(BasicInterfaceTest.BaseTest):
-    def setUp(self):
-         super().setUp()
-         self._test_ip = True
-         self._test_ipv6 = True
-         self._base_path = ['interfaces', 'macsec']
-         self._options = { 'macsec0': ['source-interface eth0', 'security cipher gcm-aes-128'] }
+    @classmethod
+    def setUpClass(cls):
+         cls._test_ip = True
+         cls._test_ipv6 = True
+         cls._base_path = ['interfaces', 'macsec']
+         cls._options = { 'macsec0': ['source-interface eth0', 'security cipher gcm-aes-128'] }
 
          # if we have a physical eth1 interface, add a second macsec instance
-         if 'eth1' in Section.interfaces("ethernet"):
+         if 'eth1' in Section.interfaces('ethernet'):
              macsec = { 'macsec1': [f'source-interface eth1', 'security cipher gcm-aes-128'] }
-             self._options.update(macsec)
+             cls._options.update(macsec)
 
-         self._interfaces = list(self._options)
+         cls._interfaces = list(cls._options)
 
     def test_macsec_encryption(self):
         # MACsec can be operating in authentication and encryption mode - both
diff --git a/smoketest/scripts/cli/test_interfaces_pseudo_ethernet.py b/smoketest/scripts/cli/test_interfaces_pseudo_ethernet.py
index 10bd7ca34..54cd8566b 100755
--- a/smoketest/scripts/cli/test_interfaces_pseudo_ethernet.py
+++ b/smoketest/scripts/cli/test_interfaces_pseudo_ethernet.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python3
 #
-# Copyright (C) 2020 VyOS maintainers and contributors
+# Copyright (C) 2020-2021 VyOS maintainers and contributors
 #
 # This program is free software; you can redistribute it and/or modify
 # it under the terms of the GNU General Public License version 2 or later as
@@ -19,20 +19,20 @@ import unittest
 from base_interfaces_test import BasicInterfaceTest
 
 class PEthInterfaceTest(BasicInterfaceTest.BaseTest):
-    def setUp(self):
-        self._test_ip = True
-        self._test_ipv6 = True
-        self._test_ipv6_pd = True
-        self._test_mtu = True
-        self._test_vlan = True
-        self._test_qinq = True
-        self._base_path = ['interfaces', 'pseudo-ethernet']
-        self._options = {
+    @classmethod
+    def setUpClass(cls):
+        cls._test_ip = True
+        cls._test_ipv6 = True
+        cls._test_ipv6_pd = True
+        cls._test_mtu = True
+        cls._test_vlan = True
+        cls._test_qinq = True
+        cls._base_path = ['interfaces', 'pseudo-ethernet']
+        cls._options = {
             'peth0': ['source-interface eth1'],
             'peth1': ['source-interface eth1'],
         }
-        self._interfaces = list(self._options)
-        super().setUp()
+        cls._interfaces = list(cls._options)
 
 if __name__ == '__main__':
     unittest.main(verbosity=2)
diff --git a/smoketest/scripts/cli/test_interfaces_tunnel.py b/smoketest/scripts/cli/test_interfaces_tunnel.py
index f67b813af..5f3791655 100755
--- a/smoketest/scripts/cli/test_interfaces_tunnel.py
+++ b/smoketest/scripts/cli/test_interfaces_tunnel.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python3
 #
-# Copyright (C) 2020 VyOS maintainers and contributors
+# Copyright (C) 2020-2021 VyOS maintainers and contributors
 #
 # This program is free software; you can redistribute it and/or modify
 # it under the terms of the GNU General Public License version 2 or later as
@@ -61,22 +61,22 @@ def tunnel_conf(interface):
     return json.loads(tmp)[0]
 
 class TunnelInterfaceTest(BasicInterfaceTest.BaseTest):
-    def setUp(self):
-        self._test_ip = True
-        self._test_ipv6 = True
-        self._test_mtu = True
-        self._base_path = ['interfaces', 'tunnel']
-        self.local_v4 = '192.0.2.1'
-        self.local_v6 = '2001:db8::1'
-
-        self._options = {
-            'tun10': ['encapsulation ipip', 'remote-ip 192.0.2.10', 'local-ip ' + self.local_v4],
-            'tun20': ['encapsulation gre',  'remote-ip 192.0.2.20', 'local-ip ' + self.local_v4],
+    @classmethod
+    def setUpClass(cls):
+        cls._test_ip = True
+        cls._test_ipv6 = True
+        cls._test_mtu = True
+        cls._base_path = ['interfaces', 'tunnel']
+        cls.local_v4 = '192.0.2.1'
+        cls.local_v6 = '2001:db8::1'
+        cls._options = {
+            'tun10': ['encapsulation ipip', 'remote-ip 192.0.2.10', 'local-ip ' + cls.local_v4],
+            'tun20': ['encapsulation gre',  'remote-ip 192.0.2.20', 'local-ip ' + cls.local_v4],
         }
+        cls._interfaces = list(cls._options)
 
-        self._interfaces = list(self._options)
+    def setUp(self):
         super().setUp()
-
         self.session.set(['interfaces', 'dummy', source_if, 'address', self.local_v4 + '/32'])
         self.session.set(['interfaces', 'dummy', source_if, 'address', self.local_v6 + '/128'])
 
diff --git a/smoketest/scripts/cli/test_interfaces_vxlan.py b/smoketest/scripts/cli/test_interfaces_vxlan.py
index a726aa610..fcc1b15ce 100755
--- a/smoketest/scripts/cli/test_interfaces_vxlan.py
+++ b/smoketest/scripts/cli/test_interfaces_vxlan.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python3
 #
-# Copyright (C) 2020 VyOS maintainers and contributors
+# Copyright (C) 2020-2021 VyOS maintainers and contributors
 #
 # This program is free software; you can redistribute it and/or modify
 # it under the terms of the GNU General Public License version 2 or later as
@@ -20,17 +20,17 @@ from vyos.configsession import ConfigSession, ConfigSessionError
 from base_interfaces_test import BasicInterfaceTest
 
 class VXLANInterfaceTest(BasicInterfaceTest.BaseTest):
-    def setUp(self):
-        self._test_ip = True
-        self._test_ipv6 = True
-        self._test_mtu = True
-        self._base_path = ['interfaces', 'vxlan']
-        self._options = {
+    @classmethod
+    def setUpClass(cls):
+        cls._test_ip = True
+        cls._test_ipv6 = True
+        cls._test_mtu = True
+        cls._base_path = ['interfaces', 'vxlan']
+        cls._options = {
             'vxlan0': ['vni 10', 'remote 127.0.0.2'],
             'vxlan1': ['vni 20', 'group 239.1.1.1', 'source-interface eth0'],
         }
-        self._interfaces = list(self._options)
-        super().setUp()
+        cls._interfaces = list(cls._options)
 
 if __name__ == '__main__':
     unittest.main(verbosity=2)
diff --git a/smoketest/scripts/cli/test_interfaces_wireguard.py b/smoketest/scripts/cli/test_interfaces_wireguard.py
index d9a51b146..e70324f96 100755
--- a/smoketest/scripts/cli/test_interfaces_wireguard.py
+++ b/smoketest/scripts/cli/test_interfaces_wireguard.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python3
 #
-# Copyright (C) 2020 VyOS maintainers and contributors
+# Copyright (C) 2020-2021 VyOS maintainers and contributors
 #
 # This program is free software; you can redistribute it and/or modify
 # it under the terms of the GNU General Public License version 2 or later as
diff --git a/smoketest/scripts/cli/test_interfaces_wireless.py b/smoketest/scripts/cli/test_interfaces_wireless.py
index 51d97f032..39e8cd5b8 100755
--- a/smoketest/scripts/cli/test_interfaces_wireless.py
+++ b/smoketest/scripts/cli/test_interfaces_wireless.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python3
 #
-# Copyright (C) 2020 VyOS maintainers and contributors
+# Copyright (C) 2020-2021 VyOS maintainers and contributors
 #
 # This program is free software; you can redistribute it and/or modify
 # it under the terms of the GNU General Public License version 2 or later as
@@ -32,10 +32,11 @@ def get_config_value(interface, key):
     return tmp[0]
 
 class WirelessInterfaceTest(BasicInterfaceTest.BaseTest):
-    def setUp(self):
-        self._test_ip = True
-        self._base_path = ['interfaces', 'wireless']
-        self._options = {
+    @classmethod
+    def setUpClass(cls):
+        cls._test_ip = True
+        cls._base_path = ['interfaces', 'wireless']
+        cls._options = {
             'wlan0':  ['physical-device phy0', 'ssid VyOS-WIFI-0',
                        'type station', 'address 192.0.2.1/30'],
             'wlan1':  ['physical-device phy0', 'ssid VyOS-WIFI-1', 'country-code se',
@@ -45,8 +46,7 @@ class WirelessInterfaceTest(BasicInterfaceTest.BaseTest):
             'wlan11': ['physical-device phy1', 'ssid VyOS-WIFI-3', 'country-code se',
                        'type access-point', 'address 192.0.2.13/30', 'channel 0'],
         }
-        self._interfaces = list(self._options)
-        super().setUp()
+        cls._interfaces = list(cls._options)
 
     def test_wireless_add_single_ip_address(self):
         # derived method to check if member interfaces are enslaved properly
diff --git a/smoketest/scripts/cli/test_interfaces_wirelessmodem.py b/smoketest/scripts/cli/test_interfaces_wirelessmodem.py
index 696a6946b..023f57305 100755
--- a/smoketest/scripts/cli/test_interfaces_wirelessmodem.py
+++ b/smoketest/scripts/cli/test_interfaces_wirelessmodem.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python3
 #
-# Copyright (C) 2020 VyOS maintainers and contributors
+# Copyright (C) 2020-2021 VyOS maintainers and contributors
 #
 # This program is free software; you can redistribute it and/or modify
 # it under the terms of the GNU General Public License version 2 or later as