T4630: can not use same source-interface for macsec and pseudo-ethernet

A macsec interface requires a dedicated source interface, it can not be
shared with another macsec or a pseudo-ethernet interface.

set interfaces macsec macsec10 address '192.168.2.1/30'
set interfaces macsec macsec10 security cipher 'gcm-aes-256'
set interfaces macsec macsec10 security encrypt
set interfaces macsec macsec10 security mka cak '232e44b7fda6f8e2d88a07bf78a7aff4232e44b7fda6f8e2d88a07bf78a7aff4'
set interfaces macsec macsec10 security mka ckn '09924585a6f3010208cf5222ef24c821405b0e34f4b4f63b1f0ced474b9bb6e6'
set interfaces macsec macsec10 source-interface 'eth1'
commit

set interfaces pseudo-ethernet peth0 source-interface eth1
commit

Reuslts in

FileNotFoundError: [Errno 2] failed to run command: ip link add peth0 link eth1 type macvlan mode private
returned:
exit code: 2

noteworthy:
cmd 'ip link add peth0 link eth1 type macvlan mode private'
returned (out):

returned (err):
RTNETLINK answers: Device or resource busy

[[interfaces pseudo-ethernet peth0]] failed
Commit failed

1 files changed, 6 insertions, 0 deletions

diff --git a/python/vyos/configverify.py b/python/vyos/configverify.py
index 2ab3cb408..447ec795c 100644
--- a/python/vyos/configverify.py
+++ b/python/vyos/configverify.py
@@ -295,6 +295,12 @@ def verify_source_interface(config):
         raise ConfigError(f'Invalid source-interface "{src_ifname}". Interface '
                           f'is already a member of bond "{bond_name}"!')
 
+    if 'is_source_interface' in config:
+        tmp = config['is_source_interface']
+        src_ifname = config['source_interface']
+        raise ConfigError(f'Can not use source-interface "{src_ifname}", it already ' \
+                          f'belongs to interface "{tmp}"!')
+
 def verify_dhcpv6(config):
     """
     Common helper function used by interface implementations to perform