resolved: refresh resolv.conf files when link goes away

This might have the effect that some DNS server or search domain
disappears, hence rewrite the relevant files.

See: #27543
(cherry picked from commit 562f7bde8872b4fd03db11bf25c9dd294fd2c186)

diff --git a/src/resolve/resolved-manager.c b/src/resolve/resolved-manager.c
index 99787f782210e830b27be49917f96112c4b431f2..a6f21c1234bccb0614407552cd6bb4bd29ff11f9 100644 (file)
--- a/src/resolve/resolved-manager.c
+++ b/src/resolve/resolved-manager.c
@@ -95,6 +95,9 @@ static int manager_process_link(sd_netlink *rtnl, sd_netlink_message *mm, void *
                         log_debug("Removing link %i/%s", l->ifindex, l->ifname);
                         link_remove_user(l);
                         link_free(l);
+
+                        /* Make sure DNS servers are dropped from written resolv.conf if their link goes away */
+                        manager_write_resolv_conf(m);
                 }
 
                 break;