utils: T5738: always use vyos.utils.network.interface_exists over os.path.exists

(cherry picked from commit 5bb27f0c6220fd940b63cdd37a60c312c0ac3efd)

5 files changed, 15 insertions, 11 deletions

diff --git a/python/vyos/configverify.py b/python/vyos/configverify.py
index 6508ccdd9..894dc3286 100644
--- a/python/vyos/configverify.py
+++ b/python/vyos/configverify.py
@@ -206,13 +206,13 @@ def verify_mirror_redirect(config):
 
     It makes no sense to mirror traffic back at yourself!
     """
-    import os
+    from vyos.utils.network import interface_exists
     if {'mirror', 'redirect'} <= set(config):
         raise ConfigError('Mirror and redirect can not be enabled at the same time!')
 
     if 'mirror' in config:
         for direction, mirror_interface in config['mirror'].items():
-            if not os.path.exists(f'/sys/class/net/{mirror_interface}'):
+            if not interface_exists(mirror_interface):
                 raise ConfigError(f'Requested mirror interface "{mirror_interface}" '\
                                    'does not exist!')
 
@@ -222,7 +222,7 @@ def verify_mirror_redirect(config):
 
     if 'redirect' in config:
         redirect_ifname = config['redirect']
-        if not os.path.exists(f'/sys/class/net/{redirect_ifname}'):
+        if not interface_exists(redirect_ifname):
             raise ConfigError(f'Requested redirect interface "{redirect_ifname}" '\
                                'does not exist!')
 
@@ -280,6 +280,7 @@ def verify_interface_exists(ifname, warning_only=False):
     from vyos.base import Warning
     from vyos.configquery import ConfigTreeQuery
     from vyos.utils.dict import dict_search_recursive
+    from vyos.utils.network import interface_exists
 
     # Check if interface is present in CLI config
     config = ConfigTreeQuery()
@@ -288,7 +289,7 @@ def verify_interface_exists(ifname, warning_only=False):
         return True
 
     # Interface not found on CLI, try Linux Kernel
-    if os.path.exists(f'/sys/class/net/{ifname}'):
+    if interface_exists(ifname):
         return True
 
     message = f'Interface "{ifname}" does not exist!'
diff --git a/python/vyos/template.py b/python/vyos/template.py
index d1b3e8fa8..ffccae9a1 100644
--- a/python/vyos/template.py
+++ b/python/vyos/template.py
@@ -294,7 +294,8 @@ def network_from_ipv4(address):
 @register_filter('is_interface')
 def is_interface(interface):
     """ Check if parameter is a valid local interface name """
-    return os.path.exists(f'/sys/class/net/{interface}')
+    from vyos.utils.network import interface_exists
+    return interface_exists(interface)
 
 @register_filter('is_ip')
 def is_ip(addr):
diff --git a/src/conf_mode/container.py b/src/conf_mode/container.py
index e967bee71..910a92a7c 100755
--- a/src/conf_mode/container.py
+++ b/src/conf_mode/container.py
@@ -32,6 +32,7 @@ from vyos.utils.file import write_file
 from vyos.utils.process import call
 from vyos.utils.process import cmd
 from vyos.utils.process import run
+from vyos.utils.network import interface_exists
 from vyos.template import bracketize_ipv6
 from vyos.template import inc_ip
 from vyos.template import is_ipv4
@@ -471,7 +472,7 @@ def apply(container):
             # T5147: Networks are started only as soon as there is a consumer.
             # If only a network is created in the first place, no need to assign
             # it to a VRF as there's no consumer, yet.
-            if os.path.exists(f'/sys/class/net/{network_name}'):
+            if interface_exists(network_name):
                 tmp = Interface(network_name)
                 tmp.add_ipv6_eui64_address('fe80::/64')
                 tmp.set_vrf(network_config.get('vrf', ''))
diff --git a/src/conf_mode/qos.py b/src/conf_mode/qos.py
index 4a0b4d0c5..2b4fcc1bf 100755
--- a/src/conf_mode/qos.py
+++ b/src/conf_mode/qos.py
@@ -36,8 +36,9 @@ from vyos.qos import RateLimiter
 from vyos.qos import RoundRobin
 from vyos.qos import TrafficShaper
 from vyos.qos import TrafficShaperHFSC
-from vyos.utils.process import run
 from vyos.utils.dict import dict_search_recursive
+from vyos.utils.network import interface_exists
+from vyos.utils.process import run
 from vyos import ConfigError
 from vyos import airbag
 airbag.enable()
@@ -214,7 +215,7 @@ def apply(qos):
         return None
 
     for interface, interface_config in qos['interface'].items():
-        if not os.path.exists(f'/sys/class/net/{interface}'):
+        if not interface_exists(interface):
             # When shaper is bound to a dialup (e.g. PPPoE) interface it is
             # possible that it is yet not availbale when to QoS code runs.
             # Skip the configuration and inform the user
diff --git a/src/tests/test_template.py b/src/tests/test_template.py
index aba97015e..dbb86b40b 100644
--- a/src/tests/test_template.py
+++ b/src/tests/test_template.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python3
 #
-# Copyright (C) 2020-2023 VyOS maintainers and contributors
+# Copyright (C) 2020-2024 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
@@ -14,9 +14,9 @@
 # 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 vyos.template
 
+from vyos.utils.network import interface_exists
 from ipaddress import ip_network
 from unittest import TestCase
 
@@ -26,7 +26,7 @@ class TestVyOSTemplate(TestCase):
 
     def test_is_interface(self):
         for interface in ['lo', 'eth0']:
-            if os.path.exists(f'/sys/class/net/{interface}'):
+            if interface_exists(interface):
                 self.assertTrue(vyos.template.is_interface(interface))
             else:
                 self.assertFalse(vyos.template.is_interface(interface))