From 33f7ad52fd0b3578223c4b3472498f062389f2de Mon Sep 17 00:00:00 2001
From: Jamie Cameron <jcameron@webmin.com>
Date: Sat, 22 Aug 2020 17:48:27 -0700
Subject: [PATCH] Don't include self-referential structures in list of
 interfaces, as they can't be serialized

---
 net/netplan-lib.pl | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/net/netplan-lib.pl b/net/netplan-lib.pl
index 1e1e0e0a1..8ab3fdf16 100644
--- a/net/netplan-lib.pl
+++ b/net/netplan-lib.pl
@@ -627,9 +627,23 @@ foreach my $origl (@$lref) {
 		}
 	$lnum++;
 	}
+&cleanup_yaml_parents($rv);
 return $rv;
 }
 
+# cleanup_yaml_parents(&config)
+# Remove all 'parent' fields once parsing is done, as they can't be serialized
+sub cleanup_yaml_parents
+{
+my ($conf) = @_;
+foreach my $c (@$conf) {
+	delete($c->{'parent'});
+	if ($c->{'members'}) {
+		&cleanup_yaml_parents($c->{'members'});
+		}
+	}
+}
+
 # yaml_lines(&directive, indent-string)
 sub yaml_lines
 {