resolved: also rewrite private /etc/resolv.conf when configuration is changed via bus calls

This also moves log message generation into manager_write_resolv_conf(), so
that it is shorter to invoke the function, given that we have to invoke it at a
couple of additional places now.

Fixes: #3225

1 files changed, 8 insertions, 0 deletions

diff --git a/src/resolve/resolved-link-bus.c b/src/resolve/resolved-link-bus.c
index 2d5cd4a20d..6aff427192 100644
--- a/src/resolve/resolved-link-bus.c
+++ b/src/resolve/resolved-link-bus.c
@@ -23,6 +23,7 @@
 #include "resolve-util.h"
 #include "resolved-bus.h"
 #include "resolved-link-bus.h"
+#include "resolved-resolv-conf.h"
 #include "strv.h"
 
 static BUS_DEFINE_PROPERTY_GET_ENUM(property_get_resolve_support, resolve_support, ResolveSupport);
@@ -232,6 +233,8 @@ int bus_link_method_set_dns_servers(sd_bus_message *message, void *userdata, sd_
         dns_server_unlink_marked(l->dns_servers);
         link_allocate_scopes(l);
 
+        (void) manager_write_resolv_conf(l->manager);
+
         return sd_bus_reply_method_return(message, NULL);
 
 clear:
@@ -306,6 +309,9 @@ int bus_link_method_set_domains(sd_bus_message *message, void *userdata, sd_bus_
                 goto clear;
 
         dns_search_domain_unlink_marked(l->search_domains);
+
+        (void) manager_write_resolv_conf(l->manager);
+
         return sd_bus_reply_method_return(message, NULL);
 
 clear:
@@ -444,6 +450,8 @@ int bus_link_method_revert(sd_bus_message *message, void *userdata, sd_bus_error
         link_allocate_scopes(l);
         link_add_rrs(l, false);
 
+        (void) manager_write_resolv_conf(l->manager);
+
         return sd_bus_reply_method_return(message, NULL);
 }