netcfg: restore upstream behavior and configuration features from last release.

helpers/DATA/netcfg/07_ruc_1.142ubuntu7.patch

@@ -0,0 +1,33 @@
+From ad4fc74f5ad7b5195f3cf23c7943c4736702ae72 Mon Sep 17 00:00:00 2001
+From: Dimitri John Ledkov <xnox@ubuntu.com>
+Date: Wed, 25 Apr 2018 13:25:45 +0100
+Subject: 1.142ubuntu7 (patches unapplied)
+
+Imported using git-ubuntu import.
+---
+ debian/changelog  | 7 +++++++
+ write_interface.c | 5 +++--
+ 2 files changed, 10 insertions(+), 2 deletions(-)
+
+diff --git a/write_interface.c b/write_interface.c
+index 5ca1cc0..67d2977 100644
+--- a/write_interface.c
++++ b/write_interface.c
+@@ -170,11 +170,12 @@ static int nc_wi_netplan_write_nameservers(const struct netcfg_interface *interf
+ {
+ 	int i;
+ 
+-	if (empty_str(domain))
++	if (empty_str(domain) && empty_str(interface->nameservers[0]))
+ 		return 1;
+ 
+ 	fprintf(fd, "      nameservers:\n");
+-	fprintf(fd, "          search: [ %s ]\n", domain);
++	if (!empty_str(domain))
++		fprintf(fd, "          search: [ %s ]\n", domain);
+ 	fprintf(fd, "          addresses:\n");
+ 	for (i = 0; i < NETCFG_NAMESERVERS_MAX; i++) {
+ 		if (!empty_str(interface->nameservers[i])) {
+-- 
+cgit v1.1
+