vyos.util: add common helper to load kernel modules

l2tpv3, wireguard, wirelessmodem, nat all require additional Kernel modules
to be present on the system. Each and every interface implemented their own
way of loading a module - by copying code.

Use a generic function, vyos.util.check_kmod() to load any arbitrary kernel
module passed as string or list.

1 files changed, 2 insertions, 7 deletions

diff --git a/src/conf_mode/interfaces-wirelessmodem.py b/src/conf_mode/interfaces-wirelessmodem.py
index ec5a85e54..0964a8f4d 100755
--- a/src/conf_mode/interfaces-wirelessmodem.py
+++ b/src/conf_mode/interfaces-wirelessmodem.py
@@ -29,12 +29,7 @@ from vyos import ConfigError
 from vyos import airbag
 airbag.enable()
 
-def check_kmod():
-    modules = ['option', 'usb_wwan', 'usbserial']
-    for module in modules:
-        if not os.path.exists(f'/sys/module/{module}'):
-            if call(f'modprobe {module}') != 0:
-                raise ConfigError(f'Loading Kernel module {module} failed')
+k_mod = ['option', 'usb_wwan', 'usbserial']
 
 def find_device_file(device):
     """ Recurively search /dev for the given device file and return its full path.
@@ -153,7 +148,7 @@ def apply(wwan):
 
 if __name__ == '__main__':
     try:
-        check_kmod()
+        check_kmod(k_mod)
         c = get_config()
         verify(c)
         generate(c)